Exhibit 99.1

NEWMARKET CORPORATION REPORTS IMPROVED THIRD QUARTER AND FIRST NINE MONTHS 2012 RESULTS

Richmond, VA, October 25, 2012 – NewMarket Corporation (NYSE:NEU) President and Chief Executive Officer, Thomas E. Gottwald, released the following earnings report of the Company’s operations for the third quarter and first nine months of 2012.

Net income for the third quarter of 2012 amounted to $64.7 million, or $4.83 per share, compared to net income of $71.4 million, or $5.22 per share, for the third quarter of last year. For the first nine months of this year, net income was $186.5, or $13.91 per share, compared to net income of $173.2 million, or $12.54 per share, for the same period last year.

As reflected on the following Summary of Earnings, results for the third quarter and first nine months periods of both this year and last year include certain special items. These items are presented individually on the following Summary of Earnings and discussed more fully on the financial statements and footnotes that are a part of this earnings release.

Excluding these special items from all periods, earnings for the third quarter of 2012 of $65.8 million, or $4.91 per share, increased 19 percent over earnings for the third quarter of last year of $55.4 million, or $4.06 per share. On the same basis, earnings for the first nine months of 2012 were $196.1 million, or $14.62 per share, an improvement of 23 percent compared to last year’s results of $159.2 million, or $11.52 per share. Earnings per share for the third quarter and first nine months of this year on this basis increased 21 percent and 27 percent, respectively.

For the third quarter of this year, petroleum additives operating profit was $96.3 million, an improvement of 15 percent over third quarter last year, excluding the 2011 gain on legal settlement. Petroleum additives operating profit of $122.8 million and $288.9 million for last year’s third quarter and first nine months, respectively, included a $38.7 million before-tax gain on a legal settlement. Sales of petroleum additives for the third quarter of this year were $547.7 million, down slightly compared to sales for the third quarter of last year of $552.0 million while shipments for this third quarter were essentially flat with last year’s period. For the first nine months of this year, petroleum additives operating profit increased to $300.4 million, an improvement of 20 percent over the same period last year, excluding the 2011 gain on legal settlement. For the first nine months of this year, sales increased to $1,689.6 million, an improvement of approximately 4 percent over sales of $1,627.4 million for nine months 2011 while shipments were down approximately 3 percent for the period.

Our business continues to generate strong cash flows enabling us to reduce debt $99.3 million since the beginning of this year. In the same period, cash has increased $29.3 million and other working capital is up $41.6 million.

Our petroleum additives business continues its strong performance. Our customer focused solutions and technology-driven product offerings are two of the key fundamentals of our continued success. We continue to increase our investment in research and development as evidence of our commitment to these goals. Our financial condition continues to grow stronger, enhancing our position for future growth and ability to improve shareholder value.

Please read our third quarter Form 10-Q for more details on the operations of the Company.

Sincerely,

/s/ Thomas E. Gottwald

Thomas E. Gottwald

The earnings for both the third quarter and first nine months of this year and last year include an expense from an interest rate swap related to the financing on Foundry Park resulting from the Company valuing the swap agreement at fair value at the end of each reporting period. The first nine months of this year also include a loss on the early extinguishment of debt. The third quarter and first nine months of last year include a gain on a legal settlement. The Company is reporting net income including these special items, as well as income excluding them, and related per share amounts in the Summary of Earnings included in the earnings release. The Company has also included the non-GAAP financial measure EBITDA in this earnings release. A schedule following the financial statements included in this earnings release is provided reflecting the calculation of EBITDA, defined as Net income, before the deduction of interest and financing expenses, income taxes, depreciation and amortization. EBITDA is shown on the schedule both including and excluding the items noted above. The Company believes that even though these special items are not required by or presented in accordance with United States generally accepted accounting principles (GAAP), these additional measures enhance understanding of the Company’s performance and period to period comparability. The Company believes that these items should not be considered an alternative to net income determined under GAAP.

As a reminder, a conference call and Internet webcast is scheduled for 10:00 a.m. EDT on Friday, October 26, 2012, to review third quarter and first nine months 2012 financial results. You can access the conference call live by dialing 1-877-407-9210 (domestic) or 1-201-689-8049 (international) and requesting the NewMarket conference call. To avoid delays, callers should dial in five minutes early. The call will also be broadcast via the Internet and

can be accessed through the Company’s website at www.NewMarket.com or www.investorcalendar.com. A teleconference replay of the call will be available until November 2, 2012 at 11:59 p.m. EDT by dialing 1-877-660-6853 (domestic) and 1-201-612-7415 (international). The conference ID number is 401293. A webcast replay will be available for 30 days.

NewMarket Corporation through its subsidiaries, Afton Chemical Corporation and Ethyl Corporation, develops, manufactures, blends, and delivers chemical additives that enhance the performance of petroleum products. From custom-formulated chemical blends to market-general additive components, the NewMarket family of companies provides the world with the technology to make fuels burn cleaner, engines run smoother and machines last longer.

Some of the information contained in this press release constitutes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Although NewMarket’s management believes its expectations are based on reasonable assumptions within the bounds of its knowledge of its business and operations, there can be no assurance that actual results will not differ materially from expectations.

Factors that could cause actual results to differ materially from expectations include, but are not limited to: availability of raw materials and transportation systems; supply disruptions at single sourced facilities; ability to respond effectively to technological changes in our industry; failure to protect our intellectual property rights; hazards common to chemical businesses; occurrence or threat of extraordinary events, including natural disasters and terrorist attacks; competition from other manufacturers; sudden or sharp raw materials price increases; gain or loss of significant customers; risks related to operating outside of the United States; the impact of fluctuations in foreign exchange rates; political, economic, and regulatory factors concerning our products; future governmental regulation; resolution of environmental liabilities or legal proceedings; inability to complete future acquisitions or successfully integrate future acquisitions into our business and other factors detailed from time to time in the reports that NewMarket files with the Securities and Exchange Commission, including the risk factors in Item 1A, “Risk Factors” of our 2011 Annual Report on Form 10-K, which is available to shareholders upon request.

You should keep in mind that any forward-looking statement made by NewMarket in the foregoing discussion speaks only as of the date on which such forward-looking statement is made. New risks and uncertainties come up from time to time, and it is impossible for us to predict these events or how they may affect the company. We have no duty to, and do not intend to, update or revise the forward-looking statements in this discussion after the date hereof, except as may be required by law. In light of these risks and uncertainties, you should keep in mind that the events described in any forward-looking statement made in this discussion, or elsewhere, might not occur.

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NEWMARKET CORPORATION AND SUBSIDIARIES

SEGMENT RESULTS AND OTHER FINANCIAL INFORMATION

(In millions, except per-share amounts, unaudited)

Notes to Segment Results and Other Financial Information

NEWMARKET CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per-share amounts, unaudited)

Notes to Consolidated Statements of Income

NEWMARKET CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, unaudited)

NEWMARKET CORPORATION AND SUBSIDIARIES

SELECTED CONSOLIDATED CASH FLOW DATA

(In thousands, unaudited)

NEWMARKET CORPORATION AND SUBSIDIARIES

NON-GAAP FINANCIAL INFORMATION

(In thousands, unaudited)