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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 29, 2026

NEWMARKET CORPORATION

(Exact name of registrant as specified in its charter)

\n\n\n\n\n\n\n\n\n\n\n\n\n\n

Virginia

1-32190

20-0812170

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

\n\n\n\n\n\n\n\n\n\n

330 South Fourth Street,

Richmond, Virginia

23219

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code: (804) 788-5000

Not applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

\n\n\n

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

\n\n\n

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

\n\n\n

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

\n\n\n

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

\n\n\n\n\n\n\n\n\n\n\n\n\n\n

Title of each class

Trading
Symbol(s)

Name of each exchange

on which registered

Common Stock, without par value

NEU

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

\n\n\n

Item 8.01

Other Events.

On October 29, 2026, NewMarket Corporation (the “Company”) issued a press release reporting that the Company’s Board of Directors had approved raising the quarterly dividend approximately 8% from $3.00 per share on the common stock of the Company to $3.25 per share. The quarterly dividend is equivalent to an annual dividend of $13.00 per share, up from $12.00 per share. Future dividends are subject to quarterly determination and declaration by the Board of Directors. The current quarterly dividend is payable January 1, 2027, to Company shareholders of record at the close of business on December 15, 2026. A copy of this press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

\n\n\n

Item 9.01

Financial Statements and Exhibits.

(d) Exhibits.

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

\n\n	\n
Exhibit 99.1		Press release regarding the quarterly dividend issued by the Company on October 29, 2026
\n
Exhibit 104		Cover Page Interactive Data File (Embedded within the inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: October 29, 2026

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

\n\n	\n
NewMarket Corporation
\n
By:		/s/ Timothy K. Fitzgerald
Name:		Timothy K. Fitzgerald
Title:		Vice President and Chief Financial Officer

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