NewMarket (NYSE: NEU) appoints Susan Ridlehoover Principal Accounting Officer

Rhea-AI Filing Summary

NewMarket Corporation appointed Susan M. Ridlehoover as its Principal Accounting Officer, effective immediately. She brings over 20 years of accounting and finance experience, including senior roles at Sonoco Products Company, Dominion Energy, and a decade at Ernst & Young in assurance services.

Ridlehoover, a licensed CPA in Virginia, joined NewMarket as Controller in January 2026. She will receive a base salary of $235,000, be eligible for cash bonuses and restricted stock awards, and participate in the company’s health, pension, and other benefit programs.

NEWMARKET CORP false 0001282637 0001282637 2026-02-18 2026-02-18

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): February 18, 2026

NEWMARKET CORPORATION

(Exact name of registrant as specified in its charter)

Virginia		1-32190		20-0812170
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)
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:

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

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

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

☐ 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:

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. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On February 18, 2026, NewMarket Corporation (the Company) appointed Susan M. Ridlehoover to serve as Principal Accounting Officer, effective immediately. Mrs. Ridlehoover, age 45, has over 20 years of accounting and finance experience and joined the Company as Controller in January 2026. Immediately prior to joining the Company, Mrs. Ridlehoover served as Senior Director, Corporate Controller at Sonoco Products Company, Inc. (Sonoco). Mrs. Ridlehoover joined Sonoco in January 2023 and served in various roles leading Technical Accounting and Integration Management. Before joining Sonoco, Mrs. Ridlehoover served in a variety of accounting roles at Dominion Energy, Inc. from 2015 to 2022. Mrs. Ridlehoover spent 10 years with Ernst & Young focusing on assurance services before transitioning to industry roles and is a licensed Certified Public Accountant in the Commonwealth of Virginia. Mrs. Ridlehoover will receive a base salary of $235,000, will be eligible for cash bonuses and restricted stock awards and will participant in the Company’s health, pension and other benefit programs.

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: February 18, 2026

NEWMARKET CORPORATION
By:		/s/ Timothy K. Fitzgerald
Name:		Timothy K. Fitzgerald
Title:		Vice President and Chief Financial Officer

FAQ

What executive change did NewMarket (NEU) announce on February 18, 2026?

NewMarket appointed Susan M. Ridlehoover as Principal Accounting Officer, effective immediately. This senior finance role oversees accounting policies, reporting, and controls, supporting reliable financial statements and regulatory compliance for the company’s operations.

What is the compensation package for NewMarket’s new Principal Accounting Officer?

Susan M. Ridlehoover will receive a base salary of $235,000. She will also be eligible for cash bonuses, restricted stock awards, and participation in NewMarket’s health, pension, and other employee benefit programs, aligning her pay with company performance and long-term incentives.

What is Susan M. Ridlehoover’s background before joining NewMarket (NEU)?

Ridlehoover has over 20 years of accounting and finance experience. She served as Senior Director, Corporate Controller at Sonoco Products Company, held various accounting roles at Dominion Energy, and spent 10 years at Ernst & Young focusing on assurance services earlier in her career.

When did Susan M. Ridlehoover join NewMarket and in what role?

She joined NewMarket in January 2026 as Controller. After a short period in that position, she was appointed Principal Accounting Officer, expanding her responsibilities over the company’s accounting function and financial reporting oversight, effective immediately on February 18, 2026.

Is NewMarket’s new Principal Accounting Officer a Certified Public Accountant?

Yes, Susan M. Ridlehoover is a licensed Certified Public Accountant in the Commonwealth of Virginia. This professional credential supports her responsibilities over accounting, financial reporting, and internal control frameworks at NewMarket, which operates under U.S. securities and reporting requirements.

Which companies did NewMarket’s new Principal Accounting Officer work for previously?

Before NewMarket, Ridlehoover worked at Sonoco Products Company as Senior Director, Corporate Controller, and at Dominion Energy in multiple accounting roles from 2015 to 2022. She also spent 10 years at Ernst & Young in assurance-focused positions earlier in her career.

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