INNOSPEC INC. - Annual Report: 2012 (Form 10-K)

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the transition period from              to             

Commission file number 1-13879

INNOSPEC INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (303) 792 5554

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:    Common stock, par value $0.01 per share

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes  ¨    No   x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Yes  ¨    No   x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  x    No   ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.

¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

Yes  ¨    No   x

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of the most recently completed second fiscal quarter (June 30, 2012) was approximately $489 million, based on the closing price of the common shares on the NASDAQ on June 30, 2012. Shares of common stock held by each officer and director and by each beneficial owner who owns 5% or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for any other purpose.

As of February 8, 2013, 23,332,424 shares of the registrant’s common stock were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of Innospec Inc.’s Proxy Statement for the Annual Meeting of Stockholders to be held on May 8, 2013 are incorporated by reference into Part III of this Form 10-K.

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CAUTIONARY STATEMENT RELATIVE TO FORWARD-LOOKING STATEMENTS

FORWARD-LOOKING STATEMENTS

This Form 10-K contains certain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Such forward-looking statements include statements (covered by words like “expects,” “anticipates,” “may,” “believes” or similar words or expressions), for example, which relate to operating performance, events or developments that we expect or anticipate will or may occur in the future (including, without limitation, any of the Company’s guidance in respect of sales, gross margins, pension liabilities and charges, net income, growth potential and other measures of financial performance). Although forward-looking statements are believed by management to be reasonable when made, they are subject to certain risks, uncertainties and assumptions, and our actual performance or results may differ materially from these forward-looking statements. You are urged to review our discussion of risks and uncertainties that could cause actual results to differ from forward-looking statements under the heading “Risk Factors.” The Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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PART I

When we use the terms the “Corporation,” “Company,” “Registrant,” “we,” “us” and “our,” we are referring to Innospec Inc. and its consolidated subsidiaries (“Innospec”) unless otherwise indicated or the context otherwise requires.

General

Innospec develops, manufactures, blends, markets and supplies fuel additives, personal care and fragrance products and other specialty chemicals. Our products are sold primarily to oil refineries, personal care and fragrance companies, and other chemical and industrial companies throughout the world. Our fuel additives help improve fuel efficiency, boost engine performance and reduce harmful emissions. Our other specialty chemicals provide effective technology-based solutions for our customers’ processes or products focused in the Personal Care; Polymers; and Fragrance Ingredients markets.

Our principal executive offices are in Littleton, Colorado. We became an independent company on May 22, 1998, when we were spun off from our then parent corporation Great Lakes Chemical Corporation (which subsequently became Chemtura Corporation). We changed our name from Octel Corp. to Innospec Inc. on January 30, 2006. Our common stock is listed on the NASDAQ under the symbol “IOSP.”

Segmental Information

Innospec divides its business into three segments for management and reporting purposes:

The Fuel Specialties and Performance Chemicals segments operate in markets where we actively seek growth opportunities although their ultimate customers are different. The Octane Additives segment is generally characterized by volatile and declining demand. For financial information about each of our segments, see Note 3 of the Notes to the Consolidated Financial Statements.

Fuel Specialties

Our Fuel Specialties segment develops, manufactures, blends, markets and supplies a range of specialty chemical products used as additives to a wide range of fuels. These fuel additive products help improve fuel efficiency, boost engine performance and reduce harmful emissions; and are used in the efficient operation of automotive, marine and aviation engines, power station generators, and heating and diesel particulate filter systems.

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During 2012, we completed the acquisition of Strata Control Services, Inc. (“Strata”) to help build-out our nascent Oilfield Specialties business, and we continue to seek further opportunities for this area in 2013. Outside of this acquisition, the segment has grown organically through our development of new products to address what we believe are the key drivers in demand for fuel additives. These drivers include increased focus on fuel economy, changing engine technology and legislative developments. We have devoted substantial resources towards the development of new and improved products that may be used to improve fuel efficiency.

Our customers in this segment include national oil companies, multinational oil companies and fuel retailers.

Performance Chemicals

Our Performance Chemicals segment provides effective technology-based solutions for our customers’ processes or products focused in the Personal Care; Polymers; and Fragrance Ingredients markets.

This segment has also grown organically, through the development and marketing of innovative products to the personal care and fragrance industries. The focus for our Performance Chemicals segment is to develop high performance products from its technology base in a number of targeted markets.

Our customers in this segment include large multinational companies, manufacturers of personal care and household products and specialty chemical manufacturers operating in niche industries.

Octane Additives

Our Octane Additives segment, which we believe is the world’s only producer of tetra ethyl lead (“TEL”), comprises sales of TEL for use in automotive gasoline and trading in respect of our environmental remediation business. We are continuing to responsibly manage the decrease in the sales of TEL for use in automotive gasoline in line with the remaining countries’ transition plans to unleaded gasoline. Cost improvement measures continue to be taken to respond to declining market demand.

Sales of TEL for use in automotive gasoline are made principally to state-owned refineries located in the Middle East and Northern Africa. Our environmental remediation business serves these customers to manage the cleanup of redundant plants as refineries complete the move away from leaded gasoline.

Strategy

Our strategy is to develop new and improved products and technologies to continue to strengthen and increase our market positions within our Fuel Specialties and Performance Chemicals segments. The segments together have had average organic revenue growth of

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7% per annum, and average operating income growth of 10% per annum, since 2007. We also actively continue to assess potential strategic acquisitions, partnerships and other opportunities that would enhance and expand our customer offering. We focus on opportunities that would extend our technology base, geographical coverage or product portfolio. We believe that focusing on the Fuel Specialties and Performance Chemicals segments, in which the Company has existing experience, expertise and knowledge, provides opportunities for positive returns on investment with reduced operating risk.

Geographical Area Information

Financial information with respect to our domestic and foreign operations is contained in Note 3 of the Notes to the Consolidated Financial Statements.

Working Capital

The nature of our customers’ businesses generally requires us to hold appropriate amounts of inventory in order to be able to respond quickly to customers’ needs. We therefore require corresponding amounts of working capital for normal operations. We do not, however, believe that this is materially different to what our competitors do (with the exception of cetane number improvers, in which case we maintain high enough levels of inventory, as required, to retain our position as market leader in sales of these products).

The purchase of large amounts of some raw materials for our Fuel Specialties and Octane Additives segments can create some variations in working capital requirements, but these are planned and well managed by the business.

We do not believe that our terms of sale, or terms of purchase, differ markedly from those of our competitors.

Raw Materials and Product Supply

We use a variety of raw materials and chemicals in our manufacturing and blending processes and believe that sources for these are adequate for our current operations. Our major purchases are cetane number improvers, various solvents and ethylene.

These purchases account for a substantial portion of the Company’s variable manufacturing costs. These materials are, with the exception of ethylene in Germany, readily available from more than one source. Although ethylene is, in theory, available from several sources, it is not permissible to transport ethylene by road in Germany. As a result, we source ethylene for our German operations via a direct pipeline from a neighboring site, making it effectively a single source. Ethylene is used as a primary raw material in products representing approximately 8% of the Company’s sales.

We use long-term contracts (generally with fixed or formula-based costs) and advance bulk purchases to help ensure availability and continuity of supply, and to manage the risk of cost increases. For some raw materials the risk of cost increases is managed with commodity swaps.

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The chemicals industry in general is experiencing some tightness in the supply of certain commodity materials. We continue to monitor the situation and adjust our procurement strategies as we deem appropriate. The Company forecasts its raw material requirements substantially in advance, and seeks to build long-term relationships and contractual positions with supply partners to safeguard its raw material positions. In addition, the Company operates an extensive risk management program which seeks to source key raw materials from multiple sources and to develop suitable contingency plans.

Intellectual Property

Our intellectual property, including trademarks, patents and licenses, forms a significant part of the Company’s competitive edge, particularly in the Fuel Specialties and Performance Chemicals segments. The Company does not, however, consider its business as a whole to be dependent on any one trademark, patent or license.

The Company has a portfolio of trademarks and patents, both granted and in the application stage, covering products and processes in several jurisdictions. The majority of these patents were developed by the Company and, subject to maintenance obligations including the payment of renewal fees, have at least 10 years life remaining.

The trademark “Innospec” and the Innospec device in Classes 1, 2 and 4 of the “International Classification of Goods and Services for the Purposes of the Registration of Marks” are registered in all jurisdictions in which the Company has a significant market presence. The Company also has trademark registrations for certain product names in all jurisdictions in which it has a significant market presence.

We actively protect our inventions, new technologies, and product developments by filing patent applications and maintaining trade secrets. In addition, we vigorously participate in patent opposition proceedings around the world where necessary to secure a technology base free from infringement of our intellectual property.

Customers

In 2012, the Company had a significant customer in the Fuel Specialties segment, Royal Dutch Shell plc and its affiliates (“Shell”), which accounted for $82.9 million (11%) of our net group sales. In 2011 and 2010, Shell accounted for $78.7 million (10%) and $67.8 million (10%) of our net group sales, respectively.

We have sales contracts with customers using fixed or formula-based prices, as appropriate, to maintain our gross profits.

Competition

Certain markets in which the Company operates are subject to significant competition. The Company competes on the basis of a number of factors including, but not limited to, product quality and performance, specialized product lines, customer relationships and service, and regulatory and toxicological expertise.

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Fuel Specialties: The Fuel Specialties market is generally fragmented and characterized by a small number of competitors in each submarket. The competitors in each submarket differ with no one company holding a dominant position in the Fuel Specialties market. We consider our competitive edge to be our proven technical development capacity, independence from major oil companies and strong long-term relationships with refinery customers.

Performance Chemicals: We operate in three principal markets within Performance Chemicals – Personal Care; Polymers; and Fragrance Ingredients. The Personal Care market is highly fragmented, and the Company experiences substantial competition from a large number of multinational and specialty chemical suppliers in each geographical market. The Fragrance Ingredients and Polymers markets are more concentrated, with a small number of principal competitors. Our competitive position in all three markets is based on us supplying a superior, diverse product portfolio which solves particular customer problems or enhances the performance of new or existing products. In a number of specialty chemicals markets, we also supply niche product lines, where we enjoy market-leading positions.

Octane Additives: We believe our Octane Additives segment is the world’s only producer of TEL and accordingly is the only supplier of TEL for use in automotive gasoline. The segment therefore competes with marketers of products and processes that provide alternative ways of enhancing octane performance in automotive gasoline.

Research, Development, Testing and Technical Support

Research, product/application development and technical support (“R&D”) provide the basis for the growth of our Fuel Specialties and Performance Chemicals segments. Accordingly, the Company’s R&D activity has been, and will continue to be, focused on the development of new products and formulations. Our R&D department provides technical support for all of our reporting segments. Expenditures to support R&D services were $19.6 million, $18.3 million and $17.6 million in 2012, 2011 and 2010, respectively.

We believe that our proven technical capabilities provide us with a significant competitive edge. In the last three years, the Fuel Specialties segment has developed new detergent, cold flow, stabilizers, anti-foulants, lubricity and combustion improver products, in addition to the introduction of many new cost effective fuel additive packages. This proven technical capability has also been instrumental in enabling us to produce innovative new products within our Performance Chemicals segment including Iselux^™ and Statsafe^®.

Health, Safety and Environmental Matters

We are subject to environmental laws in the majority of the countries in which we conduct business. Management believes that the Company is in material compliance with applicable environmental laws and has made appropriate provision for the continued costs of compliance with environmental laws.

Our principal site giving rise to environmental remediation liabilities is the Octane Additives manufacturing site at Ellesmere Port in the United Kingdom, which management believes is

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the last ongoing manufacturer of TEL. There are also environmental remediation liabilities on a much smaller scale in respect of our other manufacturing sites in the U.S. and Europe. At Ellesmere Port there is a continuing asset retirement program related to certain manufacturing units that have been closed. We regularly review the future expected costs of remediation and the current estimate is reflected in Note 12 of the Notes to the Consolidated Financial Statements.

We recognize environmental liabilities when they are probable and costs can be reasonably estimated, and asset retirement obligations when there is a legal obligation and costs can be reasonably estimated. This involves anticipating the program of work and the associated future expected costs, and so involves the exercise of judgment by management.

The European Union legislation known as the Registration, Evaluation and Authorization of Chemical Substances Regulations (“REACH”) requires most of the Company’s products to be registered with the European Chemicals Agency. Under this legislation the Company has to demonstrate that its products are appropriate for their intended purposes. During this registration process, the Company incurs expense to test and register its products. The Company estimates that the cost of complying with REACH will be approximately $2 million over the next three years.

Employees

The Company had approximately 900 employees in 20 countries as at December 31, 2012.

Available Information

Our corporate web site is www.innospecinc.com. We make available, free of charge, on or through this web site our annual, quarterly and current reports, and any amendments to those reports, as soon as reasonably practicable after electronically filing such material with, or furnishing it to, the SEC.

The Company routinely posts important information for investors on its web site (under Investor Relations). The Company uses this web site as a means of disclosing material, non-public information and for complying with its disclosure obligations under SEC Regulation FD (Fair Disclosure). Accordingly, investors should monitor the Investor Relations portion of the Company’s web site, in addition to following the Company’s press releases, SEC filings, public conference calls, presentations and webcasts.

The factors described below represent the principal risks associated with our business.

We are subject to extensive regulation of our international operations that could adversely affect our business and results of operations.

Due to our global operations, we are subject to many laws governing international commercial activity, conduct and relations, including those that prohibit improper payments to government

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officials, restrict where and with whom we can do business, and limit the products, software and technology that we can supply to certain countries and customers. These laws include but are not limited to, the U.S. Foreign Corrupt Practices Act and United Kingdom Bribery Act, U.S. sanctions and assets control programs administered by the U.S. Department of the Treasury, and the U.S. export control laws such as the regulations under the U.S. Export Administration Act, as well as similar laws and regulations in other countries relevant to our business operations. Violations of any of these laws or regulations, which are often complex in their application, may result in criminal or civil penalties that could have a material adverse effect on our results of operations, financial position and cash flows.

We may be required to make additional cash contributions to our United Kingdom defined benefit pension plan and recognize greater pension charges.

Movements in the underlying plan asset value and Projected Benefit Obligation (“PBO”) of our United Kingdom defined benefit pension plan are dependent on actual return on investments as well as our assumptions in respect of the discount rate, annual member mortality rates, future return on assets and future inflation. A change in any one of these assumptions could impact the plan asset value, PBO and pension charge recognized in the income statement. If future plan investment returns prove insufficient to meet future obligations, or should future obligations increase due to actuarial factors or changes in pension legislation, then we may be required to make additional cash contributions. These events could adversely impact our results of operations, financial position and cash flows.

Competition and market conditions may adversely affect our operating results.

In certain markets, our competitors are larger than us and may have greater access to financial, technological and other resources. As a result, competitors may be better able to adapt to changes in conditions in our industries, fluctuations in the costs of raw materials or changes in global economic conditions. Competitors may also be able to introduce new products with enhanced features that may cause a decline in the demand and sales of our products. Consolidation of customers or competitors, or economic problems of customers in our markets could cause a loss of market share for our products, place downward pressure on prices, result in payment delays or non-payment, or declining plant utilization rates. These risks could adversely impact our results of operations, financial position and cash flows.

We could be adversely affected by technological changes in our industry.

Our ability to maintain or enhance our technological capabilities, develop and market products and applications that meet changing customer requirements, and successfully anticipate or respond to technological changes in a cost effective and timely manner will likely impact our future business success. We compete on a number of fronts including, but not limited to, product quality and performance. In the case of some of our products, our competitors are larger than us and may have greater access to financial, technological and other resources. Our inability to maintain a technological edge, innovate and improve our products could cause a decline in the demand and sales of our products, and adversely impact our results of operations, financial position and cash flows.

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Our reliance on a small number of significant customers may have a material adverse impact on our results of operations.

Our principal customers are major multinational and state-owned oil companies, and large multinational manufacturers of personal care and household products. These industries are characterized by a concentration of a few large participants. The loss of a significant customer, a material reduction in demand by a significant customer or termination or non-renewal of a significant customer contract could adversely impact our results of operations, financial position and cash flows.

We may not be able to consummate, finance or successfully integrate future acquisitions, partnerships or other opportunities into our business, which could hinder our strategy or result in unanticipated expenses and losses.

Part of our strategy is to pursue strategic acquisitions, partnerships and other opportunities to complement and expand our existing business. The success of these transactions depends on our ability to efficiently complete transactions, integrate assets and personnel acquired in these transactions, apply our internal control processes to these acquired businesses and cooperate with our strategic partners. Consummating acquisitions, partnerships or other opportunities and integrating an acquisition involve considerable expenses, resources and management time commitments, and our failure to effect these as intended could result in unanticipated expenses and losses. Post-acquisition integration may result in unforeseen difficulties and may deplete significant financial resources that could otherwise be available for the ongoing development or expansion of existing operations. Furthermore, we may not realize the benefits of an acquisition in the way we anticipated when we first entered the transaction. Any of these risks could adversely impact our results of operations, financial position and cash flows.

Our success depends on our management team and other key personnel, the loss of any of whom could disrupt our business operations.

Our future success will depend in substantial part on the continued services of our senior management. The loss of the services of one or more of our key executive personnel could affect implementation of our business plan and result in reduced profitability. Our future success also depends on the continued ability to attract, retain and motivate highly-qualified technical, sales and support staff. We cannot guarantee that we will be able to retain our key personnel or attract or retain qualified personnel in the future. If we are unsuccessful in our efforts in this regard, this could adversely impact our results of operations, financial position and cash flows.

Continuing adverse global economic conditions could materially affect our current and future businesses.

The ongoing concern about the stability of global markets generally, and specifically the Eurozone, and the strength of counterparties in particular has led many lenders and institutional investors to reduce, or cease to provide, credit to businesses and consumers. These factors have led to a substantial and continuing decrease in spending by businesses and

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consumers, and a corresponding decrease in global infrastructure spending. The availability, cost and terms of credit have been, and may continue to be, adversely affected by the foregoing factors and these circumstances have produced, and may in the future result in, illiquid markets and wider credit spreads. Continued turbulence in the U.S. and international markets and economies, the generally restricted environment for credit, and prolonged declines in business and consumer spending could adversely impact our results of operations, financial position and cash flows.

An information technology system failure may adversely affect our business.

We rely on information technology systems to transact our business. Like other global companies, we have, from time to time, experienced threats to our data and systems. Although we have implemented administrative and technical controls and take protective actions to reduce the risk of cyber incidents and protect our information technology, and we endeavor to modify such procedures as circumstances warrant, such measures may be insufficient to prevent physical and electronic break-ins, cyber-attacks or other security breaches to our computer systems. While to date we have not experienced a material cyber security breach, our systems, processes, software and network still may be vulnerable to internal or external security breaches, computer viruses, malware or other malicious code or cyber-attack, catastrophic events, power interruptions, hardware failures, fire, natural disasters, human error, system failures and disruptions, and other events that could have security consequences. Such an information technology failure or disruption could prevent us from being able to process transactions with our customers, operate our manufacturing facilities, and properly report those transactions in a timely manner. A significant, protracted information technology system failure may result in a material adverse effect on our results of operations, financial position and cash flows.

We are also continuing with the process of implementing our new, company-wide, information system platform. The new information system platform may cost more than projected or may not perform as expected, either of which could adversely impact our results of operations, financial position and cash flows.

We may have additional tax liabilities.

We are subject to income and other taxes in the U.S. and other jurisdictions. Significant judgment is required in estimating our worldwide provision for income taxes. In the ordinary course of our business, there are many transactions and calculations where the ultimate tax determination is uncertain. Although we believe our tax estimates are reasonable, any final determination pursuant to tax audits and any related litigation could be materially different to what is reflected in our consolidated financial statements. Should any tax authority disagree with our estimates and determine additional tax liability for us, this could adversely impact our results of operations, financial position and cash flows.

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We are exposed to fluctuations in foreign currency exchange rates, which may adversely affect our results of operations.

We generate a portion of our revenues and incur some operating costs in currencies other than the U.S. dollar. In addition, the financial position and results of operations of some of our overseas subsidiaries are reported in the relevant local currency and then translated to U.S. dollars at the applicable currency exchange rate for inclusion in our consolidated financial statements. Fluctuations in these currency exchange rates affect the recorded levels of our assets and liabilities, and our results of operations.

The primary exchange rate fluctuation exposure we have is with the European Union euro, British pound sterling and Swiss franc. Exchange rates between these currencies and the U.S. dollar have fluctuated significantly in recent years and may continue to do so. We cannot accurately predict future exchange rate variability among these currencies or relative to the U.S. dollar. While we take steps to manage currency exchange rate exposure, including entering into hedging transactions, we cannot eliminate all exposure to future exchange rate variability. These exchange risks could adversely impact our results of operations, financial position and cash flows.

Sharp and unexpected fluctuations in the cost of our raw materials and energy could adversely affect our profit margins.

We use a variety of raw materials, chemicals and energy in our manufacturing and blending processes. Many of these raw materials are derived from petrochemical-based feedstocks which can be subject to periods of rapid and significant cost instability. These fluctuations in cost can be caused by political instability in oil producing nations and elsewhere, or other factors influencing global supply and demand of these materials, over which we have little or no control. We use long-term contracts (generally with fixed or formula-based costs) and advance bulk purchases to help ensure availability and continuity of supply, and to manage the risk of cost increases. We have entered into hedging arrangements for certain raw materials, but do not typically enter into hedging arrangements for all raw materials, chemicals or energy costs. If the costs of raw materials, chemicals or energy increase, and we are not able to pass on these cost increases to our customers, then profit margins and cash flows from operating activities would be adversely impacted. If raw material costs increase significantly, then our need for working capital could increase. Any of these risks could adversely impact our results of operations, financial position and cash flows.

A disruption in the supply of raw materials or transportation services would have a material adverse impact on our results of operations.

The chemical industry is generally experiencing some tightness in the supply of certain commodity materials. Although we try to anticipate problems with supplies of raw materials or transportation services by building certain inventories of strategic importance, any significant disruption in either area could affect our ability to obtain raw materials or transportation services at affordable costs, if at all, which could adversely impact our results of operations, financial position and cash flows.

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Our reliance on a small number of significant stockholders may have a material adverse impact on our stock price.

Approximately 35% of our common stock is held by four stockholders. A decision by any of these stockholders to sell all or a significant part of its holding, or a sudden or unexpected disposition of our stock, could result in a significant decline in our stock price which could in turn adversely impact our ability to access equity markets which in turn could adversely impact our results of operations, financial position and cash flows.

We face risks related to our foreign operations that may adversely affect our business.

We serve global markets and operate in certain countries with political and economic instability, including the Middle East, Northern Africa, Asia-Pacific, Eastern Europe and South America regions. Our international operations are subject to numerous international business risks including, but not limited to, unsettled political conditions, risk of expropriation, import and export restrictions, exchange controls, national and regional labor strikes, high or unexpected taxes, government royalties and restrictions on repatriation of earnings or proceeds from liquidated assets of overseas subsidiaries. Any of these could adversely impact our results of operations, financial position and cash flows.

Failure to protect our intellectual property rights could adversely affect our future performance and cash flows.

Failure to maintain or protect our intellectual property rights may result in the loss of valuable technologies, or us having to pay other companies for infringing on their intellectual property rights. Measures taken by us to protect our intellectual property may be challenged, invalidated, circumvented or rendered unenforceable. We may also face patent infringement claims from our competitors which may result in substantial litigation costs, claims for damages or a tarnishing of our reputation even if we are successful in defending against these claims, which may cause our customers to switch to our competitors. Any of these events could adversely impact our results of operations, financial position and cash flows.

Our products are subject to extensive government scrutiny and regulation.

We are subject to regulation by federal, state, local and foreign government authorities. In some cases, we need government approval of our products, manufacturing processes and facilities before we may sell certain products. Many products are required to be registered with the U.S. Environmental Protection Agency and with comparable government agencies in the European Union and elsewhere. We are also subject to ongoing reviews of our products, manufacturing processes and facilities by government authorities, and must also produce product data and comply with detailed regulatory requirements.

In order to obtain regulatory approval of certain new products we must, among other things, demonstrate that the product is appropriate and effective for its intended uses, and that we are capable of manufacturing the product in accordance with applicable regulations. This approval process can be costly, time consuming, and subject to unanticipated and significant delays. We

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cannot be sure that necessary approvals will be granted on a timely basis or at all. Any delay in obtaining, or any failure to obtain or maintain, these approvals would adversely affect our ability to introduce new products and to generate income from those products. New or stricter laws and regulations may be introduced that could result in additional compliance costs and prevent or inhibit the development, manufacture, distribution and sale of our products. Such outcomes could adversely impact our results of operations, financial position and cash flows.

Legal proceedings and other claims could impose substantial costs on us.

We are from time to time involved in legal proceedings that result from, and are incidental to, the conduct of our business, including employee and product liability claims. Although we maintain insurance to protect us against a variety of claims, if our insurance coverage is not adequate to cover such claims, then our results of operations, financial position and cash flows could be adversely affected.

Environmental liabilities and compliance costs could have a substantial adverse impact on our results of operations.

We operate a number of manufacturing sites and are subject to extensive federal, state, local and foreign environmental, health and safety laws and regulations, including those relating to emissions to the air, discharges to land and water, and the generation, handling, treatment and disposal of hazardous waste and other materials on these sites. We operate under numerous environmental permits and licenses, many of which require periodic notification and renewal, which is not automatic. New or stricter laws and regulations could increase our compliance burden or costs and adversely affect our ability to develop, manufacture, blend, market and supply products.

Our operations, and the operations of prior owners of our sites, pose the risk of environmental contamination which may result in fines or criminal sanctions being imposed or require significant amounts in remediation payments.

We anticipate that certain manufacturing sites may cease production over the medium to long-term and on closure, will require safely decommissioning and some environmental remediation. The extent of our obligations will depend on the future use of the sites that are affected and the environmental laws in effect at the time. We currently have made a decommissioning and remediation provision in our consolidated financial statements based on current known obligations, anticipated plans for sites and existing environmental laws. If there were to be unexpected or unknown contamination at these sites, or future plans for the sites or environmental laws change, then current provisions may prove inadequate, which could adversely impact our results of operations, financial position and cash flows.

The inability of counterparties to meet their contractual obligations could have a substantial adverse impact on our results of operations.

We sell products to oil refineries and chemical companies throughout the world. Credit limits, ongoing credit evaluation and account monitoring procedures are used to minimize bad debt

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risk. Collateral is not generally required. We have in place a credit facility with a syndicate of banks. We use derivatives, including interest rate swaps, commodity swaps and foreign currency forward exchange contracts, in the normal course of business to manage market risks. We enter into derivative instruments with a diversified group of major financial institutions in order to manage the exposure to non-performance of such instruments.

We remain subject to market and credit risks including the ability of counterparties to meet their contractual obligations and the potential non-performance of counterparties to deliver contracted commodities or services at the contracted price. The inability of counterparties to meet their contractual obligations could have an adverse impact on our results of operations, financial position and cash flows.

The terms of our credit facility may restrict our ability to incur additional indebtedness or to otherwise expand our business.

Our revolving credit facility contains restrictive clauses which may limit our activities, and operational and financial flexibility. We may not be able to borrow under the credit facility if an event of default under the terms of the facility occurs. An event of default under the credit facility includes a material adverse change to our assets, operations or financial condition, and certain other events. The credit facility also contains a number of restrictions that limit our ability, among other things, and subject to certain limited exceptions, to incur additional indebtedness, pledge our assets as security, guarantee obligations of third parties, make investments, undergo a merger or consolidation, dispose of assets or materially change our line of business.

In addition, the credit facility requires us to meet certain financial ratios, including ratios based on net debt to EBITDA and net interest expense to EBITDA. EBITDA is a non-GAAP measure of liquidity defined in the credit facility. Our ability to meet these financial covenants depends upon the future successful operating performance of the business. If we fail to comply with financial covenants, we would be in default under the credit facility and the maturity of our outstanding debt could be accelerated unless we were able to obtain waivers from our lenders. If we were found to be in default under the credit facility, it could adversely impact our results of operations, financial position and cash flows.

Our business is subject to the risk of manufacturing disruptions, the occurrence of which would adversely affect our results of operations.

We are subject to hazards common to chemical manufacturing, blending, storage, handling and transportation including fires, labor strikes or slowdowns, explosions, mechanical failure, extreme weather, transportation interruptions, remediation, chemical spills and the release or discharge of toxic or hazardous substances. These hazards could result in loss of life, property damage, environmental contamination and temporary or permanent manufacturing cessation. Any of these factors could adversely impact our results of operations, financial position and cash flows.

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Domestic or international natural disasters or terrorist attacks may disrupt our operations, decrease the demand for our products or otherwise have an adverse impact on our business.

Chemical related assets, and U.S. corporations such as us, may be at greater risk of future terrorist attacks than other possible targets in the U.S., the United Kingdom and throughout the world. Extraordinary events such as natural disasters may negatively affect local economies, including those of our customers or suppliers. The occurrence of such events cannot be predicted, but they can adversely impact economic conditions in general and in our specific markets. The resulting damage from such events could include loss of life, property damage or site closure. Any of these matters could adversely impact our results of operations, financial position and cash flows.

Our Octane Additives segment could decline faster than expected.

The remaining sales of the Octane Additives segment are now concentrated in a relatively small number of customers and therefore could decline quickly and dramatically and adversely impact our future results of operations, financial position and cash flows. We expect to cease sales of TEL for use in automotive gasoline in 2013, however this is dependent upon the phase out plans of the remaining countries as they transition to unleaded gasoline.

New regulations related to conflict minerals could adversely impact our business.

The Dodd-Frank Wall Street Reform and Consumer Protection Act contains provisions to improve transparency and accountability concerning the supply of certain minerals, known as conflict minerals, originating from the Democratic Republic of Congo and adjoining countries. As a result, the SEC has adopted annual disclosure and reporting requirements for those companies which use such conflict minerals in their products. These new requirements may require due diligence efforts in 2013, with initial disclosure requirements beginning in May 2014. There may be costs associated with complying with these disclosure and reporting requirements, if relevant, including for due diligence to determine the sources of materials used in our products and other potential changes to products, processes or sources of supply as a consequence of such verification activities. The implementation of these rules could adversely affect the sourcing, supply and pricing of materials used in our products. As there may be only a limited number of suppliers offering “conflict free” minerals, we cannot be sure that we will be able to obtain necessary conflict free minerals, if desired, from such suppliers in sufficient quantities or at competitive prices. Also, we may face reputational challenges if we determine that certain of our products contain minerals not determined to be conflict free or if we are unable to sufficiently verify the origins for all materials used in our products through the procedures we may implement.

None.

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A summary of the Company’s principal properties is shown in the following table. Each of these properties is owned by the Company except where otherwise noted:

Manufacturing Capacity

We believe that our plants and supply agreements are sufficient to meet current sales levels. Operating rates of the plants are generally flexible and varied with product mix and normal sales swings. We believe that all of our facilities are maintained to appropriate levels and in good operating condition though there remains an ongoing need for capital investment.

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While we are involved from time to time in claims and legal proceedings that result from, and are incidental to, the conduct of our business including business and commercial litigation, employee and product liability claims, there are no other material pending legal proceedings to which the Company or any of its subsidiaries is a party, or of which any of their property is subject. It is possible however, that an adverse resolution of an unexpectedly large number of such individual items could in the aggregate have a material adverse effect on results of operations for a particular year or quarter.

Not applicable.

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PART II

Market Information and Holders

The Company’s common stock is listed on the NASDAQ under the symbol “IOSP.” As of February 8, 2013 there were 1,008 registered holders of the common stock. The following table shows the closing high and low prices of our common stock for each of the last eight quarters:

Dividends

The Company declared the following cash dividend for the year ended December 31, 2012.

On December 14, 2011, we entered into a five-year revolving credit facility which contains no restrictions on our ability to declare dividends and the Company is allowed to repurchase its own common stock as long as we are in compliance with the financial covenants in the credit facility.

Issuer Purchases of Equity Securities

No purchases of equity securities by the issuer or affiliated purchasers were made during the fourth quarter of 2012.

Repurchased common stock is held as treasury stock unless reissued under equity compensation plans.

The Company’s most recent Rule 10b5-1 and/or 10b-18 repurchase plan ended on December 31, 2011 and therefore the Company made no repurchases under such plans in 2012. The Company repurchased stock up to a total of $28.7 million in 2010 and 2011 under its previous plan which commenced on November 8, 2010 and allowed the Company to repurchase up to $5.0 million of common stock annually in 2010, 2011 and 2012. However,

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on September 7, 2011 the Company announced that the Board of Directors had authorized an increase in share repurchases under such Rule 10b5-1 and/or 10b-18 repurchase plan from up to $5.0 million of common stock to up to $40.0 million of common stock, dependent on market conditions. The plan was also amended to terminate on December 31, 2011. The Company may approve further share repurchase programs in the future but there are currently no active repurchase plans in place.

The Company has authorized securities for issuance under equity compensation plans. The information contained in the table under the heading “Equity Compensation Plans” in the Proxy Statement is incorporated herein by reference. The current limit for the total amount of shares which can be issued or awarded under the Company’s five stock option plans is 2,640,000.

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Stock Price Performance Graph

The graph below compares the cumulative total return to stockholders on the common stock of the Corporation, S&P 500 Index, NASDAQ Composite Index and Russell 2000 Index since December 31, 2007, assuming a $100 investment and the re-investment of any dividends thereafter.

Value of $100 Investment made December 31, 2007*

* Excludes purchase commissions

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FINANCIAL HIGHLIGHTS

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QUARTERLY SUMMARY

NOTES

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QUARTERLY SUMMARY (continued)

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This discussion should be read in conjunction with our consolidated financial statements and the notes thereto.

EXECUTIVE OVERVIEW

Our business performance in 2012 was against a background of continued weakness in European demand due to the on-going economic difficulties, especially in Southern European countries. Demand in other developed markets continued to show slow growth, while enhanced demand for fuel and personal care products in emerging markets boosted prospects in South America and Asia-Pacific. Although global fuel demand was relatively weak, the major weakness was in gasoline demand in the developed markets of Europe and North America, driven mainly by a significant improvement in vehicle fuel economy. Diesel demand, however, was stronger, supported by global commercial fleet demand, and passenger car demand in Europe. There was limited new legislation in the developed markets, with a slow roll out of sulfur and biofuel legislation in other markets. Strong demand from the oil and gas sector, notably in North America, provided a positive environment for our nascent Oilfield Specialties business, while consumer demand for contaminant-free and natural/renewable cosmetic ingredients provides a driver for new technology in personal care. Economic difficulties in the European markets have driven softer demand for our Polymers business.

We have managed our investments in capital equipment, working capital and recruitment of additional skilled personnel in line with these market factors. Our capital program and expenses during 2012 included investment in a new information system platform, which we expect to add value to our business in 2014. During 2012, we completed the acquisition of Strata Control Services, Inc. (“Strata”) to help build-out our presence in Oilfield Specialties, and we continue to seek further opportunities for this area in 2013. We also made a non-binding offer for the TPC Group, and later withdrew this offer as we felt that we could not derive sufficient shareholder value from the deal. This aborted transaction resulted in a $2.1 million charge for acquisition-related costs in the fourth quarter. We also instituted a one-time special dividend of $2.00 per share, which was paid on December 21, 2012 to shareholders of record on December 14, 2012.

CRITICAL ACCOUNTING ESTIMATES

Note 2 of the Notes to the Consolidated Financial Statements includes a summary of the significant accounting policies and methods used in the preparation of the consolidated financial statements.

Contingencies

We are subject to legal, regulatory and other proceedings and claims. The Company discloses information concerning contingent liabilities in respect of these claims and proceedings for which an unfavorable outcome is more than remote and the potential loss could materially

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impact our results of operations, financial position and cash flows. We recognize within selling, general and administrative expenses liabilities for these claims and proceedings when it is probable that the Company has incurred a loss based on an unfavorable outcome and the amount of the loss can be reasonably estimated and we endeavor to fairly present, in conjunction with the disclosures of these matters in our consolidated financial statements, management’s view of our exposure. We review outstanding claims and proceedings with external counsel as appropriate to assess probability and estimates of loss. When the reasonable estimate is a range, the recognized liability will be the best estimate within the range. If no amount in the range is a better estimate than any other amount then the minimum amount of the range will be recognized.

We re-evaluate our assessments each quarter or as new and significant information becomes available. The actual cost of ultimately resolving a claim or proceeding may be significantly different from the amount of the recognized liability. In addition, because it is not permissible to recognize a liability until the loss is both probable and estimable, in some cases there may be insufficient time to recognize a liability prior to the actual incurrence of the loss (upon verdict and judgment at trial, for example, or in the case of a quickly negotiated settlement).

Environmental Liabilities

Remediation provisions at December 31, 2012 amounted to $29.3 million and relate principally to our Ellesmere Port site in the United Kingdom. We recognize environmental liabilities when they are probable and costs can be reasonably estimated, and asset retirement obligations when there is a legal obligation and costs can be reasonably estimated. The Company has to anticipate the program of work required and the associated future expected costs, and comply with environmental legislation in the countries in which it operates or has operated in. The Company views the costs of vacating our Ellesmere Port site as contingent upon if and when it vacates the site because there is no present intention to do so. The Company has further determined that, due to the uncertain product life of TEL particularly in the market for aviation gasoline and other products being manufactured on site, there are uncertainties as to the probability and timing of the expected costs. Such uncertainties have been considered in estimating the provision.

Pensions

The Company maintains a defined benefit pension plan covering a number of its current and former employees in the United Kingdom. The Company also has other much smaller pension arrangements in the U.S. and overseas, but the obligations under those plans are not material. The United Kingdom plan is closed to future service accrual, but has a large number of deferred and current pensioners.

Movements in the underlying plan asset value and Projected Benefit Obligation (“PBO”) are dependent on actual return on investments as well as our assumptions in respect of the discount rate, annual member mortality rates, future return on assets and future inflation. A

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change in any one of these assumptions could impact the plan asset value, PBO and pension charge recognized in the income statement. Such changes could adversely impact our results of operations and financial position. For example, a 0.25% change in the discount rate assumption would change the PBO by approximately $26 million and the net pension charge for 2013 by approximately $0.8 million. A 0.25% change in the level of price inflation assumption would change the PBO by approximately $23 million and the net pension charge for 2013 by approximately $2.1 million.

Further information is provided in Note 9 of the Notes to the Consolidated Financial Statements.

Deferred Tax and Uncertain Income Tax Positions

At December 31, 2012, no valuation allowance is required against our foreign tax credit carry forwards within deferred tax as management believes that all the foreign tax credit carry forwards can be utilized in future periods prior to their expiration.

No deferred taxes have been provided for the unremitted earnings of our overseas subsidiaries as any tax basis differences relating to investments in these overseas subsidiaries are considered to be permanent in duration. We have no current intention to repatriate past or future earnings of our overseas subsidiaries and consider that these earnings have been reinvested overseas. If circumstances were to change that would cause these earnings to be repatriated an additional U.S. tax liability could be incurred, and we continue to monitor this position.

The calculation of our tax liabilities involves evaluating uncertainties in the application of complex tax regulations. We recognize liabilities for anticipated tax audit issues based on our estimate of whether, and the extent to which, additional taxes will be required. If we ultimately determine that payment of these amounts is unnecessary, we reverse the liability and recognize a tax benefit during the period in which we determine that the liability is no longer necessary.

We also recognize tax benefits to the extent that it is more likely than not that our positions will be sustained, based on technical merits, when challenged by the taxing authorities. To the extent that we prevail in matters for which liabilities have been established, or are required to pay amounts in excess of our liabilities, our effective tax rate in a given period may be materially affected. An unfavorable tax settlement may require cash payments and result in an increase in our effective tax rate in the year of resolution. A favorable tax settlement may be recognized as a reduction in our effective tax rate in the year of resolution. We report interest and penalties related to uncertain income tax positions as income taxes. For additional information regarding uncertain income tax positions see Note 10 of the Notes to the Consolidated Financial Statements.

Goodwill

The Company’s reporting units, the level at which goodwill is tested for impairment, are consistent with the reportable segments: Fuel Specialties, Performance Chemicals and Octane Additives. The components in each segment (including products, markets and competitors)

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have similar economic characteristics and the segments, therefore, reflect the lowest level at which operations and cash flows can be sufficiently distinguished, operationally and for financial reporting purposes, from the rest of the Company. The Company tests goodwill annually for impairment, or between years if events occur or circumstances change which suggest that an impairment may have occurred.

The Company performs its annual goodwill tests in respect of Fuel Specialties and Performance Chemicals as at December 31 each year. In reviewing for any impairment charge the fair values of the reporting segments are estimated using an after-tax cash flow methodology based on management’s best available estimates at that time. The key assumptions underpinning these calculations include future revenue growth, gross margins and the Company’s weighted average cost of capital. At December 31, 2012 we had $117.6 million and $30.1 million of goodwill relating to our Fuel Specialties and Performance Chemicals segments, respectively. Our annual impairment tests as of such date indicated no impairment because the estimated fair values of those reporting segments substantially exceeded the carrying values.

In light of the continuing decline in the Octane Additives market globally, as the Company makes sales of Octane Additives in each quarter, future remaining sales and corresponding cash flows that can be derived from the Octane Additives segment are being reduced, and accordingly the fair value of the Octane Additives segment is also reduced. As a result, the Company determined that quarterly impairment tests should be performed from January 1, 2004 and any impairment charge arising be recognized in the relevant quarter. As a result of the Octane Additives impairment tests performed during 2012, 2011 and 2010 impairment charges of $1.2 million, $2.0 million and $2.2 million, respectively, have been recognized. These charges are non-cash in nature and have no impact on taxation. In 2012 some of the assumptions and estimates relating to the Octane Additives segment discounted cash flows were revised as part of our planning processes (although the overall methodology was unchanged). These revisions had no material impact on the reporting of goodwill. There was $1.3 million of goodwill remaining at December 31, 2012 which relates to the Octane Additives segment and equates to the fair value of the goodwill at that date. Given the amount and predictability of the remaining future cash flows from the Octane Additives segment the Company expects goodwill impairment charges to be recognized in the income statement on an approximate straight-line basis to December 31, 2013. However, since the remaining sales of the Octane Additives segment are concentrated around a relatively small number of customers, there is a risk that they could dramatically decline resulting in an accelerated impairment of the Octane Additives segment goodwill as the forecast discounted cash flows from that segment would be reduced.

While we believe our assumptions for impairment tests are reasonable, they are subjective judgments, and it is possible that variations in any of the assumptions may result in materially different calculations of impairment charges, if any.

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Other Intangible Assets (Net of Amortization) and Property, Plant and Equipment

At December 31, 2012 we had $68.6 million of other intangible assets (net of amortization), and $49.8 million of property, plant and equipment, that are discussed in Notes 7 and 5 of the Notes to the Consolidated Financial Statements, respectively. These long-lived assets relate to all of our reporting segments and are being amortized or depreciated straight-line over periods of up to 13 years in respect of the other intangible assets and up to 25 years in respect of the property, plant and equipment.

We continually assess the markets and products related to these long-lived assets, as well as their specific carrying values, and have concluded that these carrying values, and amortization and depreciation periods, remain appropriate.

We also test these long-lived assets for any potential impairment when events occur or circumstances change which suggest that an impairment may have occurred. These types of events or changes in circumstances could include, but are not limited to:

In order to facilitate this testing the Company groups together assets at the lowest possible level for which cash flow information is available. Undiscounted future cash flows expected to result from the asset groups are compared with the carrying value of the assets and, if such cash flows are lower, an impairment loss may be recognized. The amount of the impairment loss is the difference between the fair value and the carrying value of the assets. Fair values are determined using post-tax cash flows discounted at the Company’s weighted average cost of capital. If events occur or circumstances change it may cause a reduction in periods over which these long-lived assets are amortized or depreciated, or result in a non-cash impairment of a portion of their carrying value. A reduction in amortization or depreciation periods would have no effect on cash flows.

We are continuing with the implementation of a new, company-wide, information system platform. The platform provider is well established in the market. The implementation will be a phased, risk-managed, site deployment and follow a multistage user acceptance program with the existing platform providing a fallback position. Internally developed software and other costs capitalized at December 31, 2012 were $10.1 million (2011 – $3.1 million). No amortization was recognized in 2012 (2011 – $0.0 million).

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RESULTS OF OPERATIONS

The following table provides operating income by reporting segment:

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Results of Operations – Fiscal 2012 compared to Fiscal 2011:

Fuel Specialties

Net sales: the table below details the components which comprise the year on year change in net sales spread across the markets in which we operate:

Sales volumes in both the Americas and ASPAC declined for the second year running primarily due to lower sales of high volume but low margin products, offset by higher sales of more added value products, resulting in an improved price and product mix in both these markets. Sales volumes, and price and product mix, in EMEA continued to benefit in 2012 from new contracts and contract amendments entered into in 2011, partially offset by a

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weakening of the European Union euro and British pound sterling against the U.S. dollar. Avtel volumes declined 24% in 2012, compared to a 13% increase in 2011, due to the timing of shipments to customers as opposed to any change in the long-term outlook for that market. This Avtel sales volume decline was partially offset by an improved customer mix.

Gross margin: the year on year increase of 1.5 percentage points primarily reflected a lower proportion of sales of lower margin products, specifically in the Americas and ASPAC markets, and the continued benefit in 2012 of the new contracts and contract amendments entered into in 2011. Many of the raw materials that we use are derived from petrochemical-based feedstocks and their costs were less volatile due to the stable crude oil prices experienced in 2012.

Operating expenses: the year on year increase of 5%, or $3.5 million, was primarily due to the release of a $3.7 million accrual in respect of an old customer claim in the first quarter of 2011 which did not recur in 2012. This increase was partially offset by the $0.5 million favorable impact of foreign currency exchange rates on our European cost base denominated in European Union euro and British pound sterling.

Performance Chemicals

Net sales: the table below details the components which comprise the year on year change in net sales spread across the markets in which we operate:

Overall sales volumes increased in this segment despite the competitive pressures faced in all the markets we serve. Improved sales volumes within the Personal Care market focused in the Americas and the global Fragrance Ingredients market, were partially offset by lower volumes due to weaker demand in our Polymers market which is focused in EMEA. Price and product mix was substantially unchanged in our larger Americas and EMEA markets, and benefitted in ASPAC due to the higher proportion of more added value products sold in 2012. Sales in all our markets, but notably EMEA, suffered from a weakening of the European Union euro and British pound sterling against the U.S. dollar.

Gross margin: the year on year increase of 1.5 percentage points reflected the continued improvement in demand across the markets despite the competitive pressures on margins, with the exception of our Polymers market. Weaker demand in our Polymers market resulted in lower sales volumes and sales prices with a consequential adverse impact on gross margin. Many of the raw materials that we use are derived from petrochemical-based feedstocks and we benefitted from the fact that their costs were less volatile due to the stable crude oil prices experienced in 2012.

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Operating expenses: the year on year increase of 8%, or $1.5 million, was primarily in respect of $1.2 million higher personnel-related compensation costs, partially offset by the $0.5 million favorable impact of foreign currency exchange rates on our European cost base denominated in European Union euro and British pound sterling.

Octane Additives

Net sales: decreased by 9% entirely in respect of lower volumes since sales mix and revenue from our environmental remediation business were unchanged. In both 2012 and 2011, sales were focused in the Middle East and Northern Africa.

Gross margin: increased marginally by 0.8 percentage points from 47.9% to 48.7%.

Operating expenses: decreased by $51.0 million primarily due to the fact that the impact of the $45.0 million NewMarket Corporation civil complaint settlement and associated $5.5 million legal and other professional expenses in 2011 did not recur in 2012.

Other Income Statement Captions

Pension credit/(charge): is non-cash, and was a $0.3 million credit and a $0.5 million charge in 2012 and 2011, respectively.

Corporate costs: the year on year increase of 32%, or $9.3 million, primarily reflected $4.7 million higher accruals for share based compensation expense, driven by the year on year rise in our stock price, including a $3.9 million higher charge in respect of the long-term incentive plan. The remainder of the increase was due to $2.7 million higher legal and other professional expenses and $2.1 million higher information technology service platform costs. Acquisition-related costs were $2.8 million and $3.0 million in 2012 and 2011, respectively.

Restructuring charge: comprised the following:

Impairment of Octane Additives segment goodwill: was $1.2 million and $2.0 million in 2012 and 2011, respectively. Effective October 1, 2011, we updated the estimates used in the detailed forecast model to calculate impairment charges to reflect the Company’s extended estimate for the future life of our Octane Additives segment from December 31, 2012 to December 31, 2013, resulting in a lower charge. We expect the impairment of Octane Additives segment goodwill charge for the year ending December 31, 2013 to be approximately $1.3 million.

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Profit on disposal, net: in 2012 the Company recognized $0.1 million profit following the disposal of surplus real estate.

Other net income/(expense): other net expense of $2.0 million primarily related to losses on translation of net assets denominated in non-functional currencies in our European businesses offset by net foreign exchange gains on foreign currency forward exchange contracts. In 2011, other net income of $6.3 million was comprised of $6.5 million of net foreign currency exchange gains and gains on translation of net assets denominated in non-functional currencies in our European businesses, and $0.2 million sundry other expenses.

Interest expense, net: decreased from $3.3 million to $1.2 million due to the lower average level of debt in 2012 and losses on interest rate swaps in 2011.

Income taxes: the effective tax rate was 28.3% and 7.0% in 2012 and 2011, respectively. The effective tax rate, once adjusted for the NewMarket Corporation civil complaint settlement, adjustment of income tax provisions and for the tax impact of acquisition-related funding, was 20.3% in 2012 compared with 15.8% in 2011. The Company believes that this adjusted effective tax rate, a non-GAAP financial measure, provides useful information to investors and may assist them in evaluating the Company’s underlying performance and identifying operating trends. In addition, management uses this non-GAAP financial measure internally to evaluate the performance of the Company’s operations and for planning and forecasting in subsequent periods.