NewMarket Corporation Announces Share Repurchase Authorization

RICHMOND, Va.--(Business Wire)--
NewMarket Corporation (NYSE:NEU) reported today that its Board of
Directors approved a share repurchase program that authorizes
management to repurchase up to $100 million of NewMarket's outstanding
common stock until December 31, 2010, as market conditions warrant and
covenants under NewMarket's existing bank and bond agreements permit.
The Board of Directors also terminated the repurchase program that was
previously announced on October 26, 2007. NewMarket may conduct its
share repurchases in the open market and in privately negotiated
transactions. The repurchase program does not require NewMarket to
acquire any specific number of shares and may be terminated or
suspended at any time.

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: increases in product
cost and our ability to increase prices; timing of sales orders; gain
or loss of significant customers; competition from other manufacturers
and resellers; resolution of environmental liabilities; changes in the
demand for our products; significant changes in new product
introduction; the impact of fluctuations in foreign exchange rates on
reported results of operations; changes in various markets;
geopolitical risks in certain of the countries in which we conduct
business; our ability to complete construction of the office building
for MeadWestvaco within budget and in a timely manner; 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 2007 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.

NewMarket Corporation
David A. Fiorenza
Investor Relations
Phone: 804-788-5555
Fax: 804-788-5688
investorrelations@newmarket.com

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