Innospec SVP reports tax-withholding share disposition

Innospec Inc. senior vice president of human resources Hardy Louis Griffin III reported a small insider transaction related to equity compensation.

Accepted by SEC EDGAR 03/03/2026 - 07:14 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Innospec Inc. senior vice president of human resources Hardy Louis Griffin III reported a small insider transaction related to equity compensation. On vesting of a restricted stock unit award, 401 shares of common stock were automatically withheld at $78.34 per share to cover income tax obligations, rather than being an open‑market trade. After this tax-withholding disposition, Griffin directly owned 10,161 common shares, reflecting his remaining equity stake in the company.

Insider Trade Summary

Exercise Price or Tax Liability: 401 shares

Exercise Price or Tax Liability 1 txn

Insider GRIFFIN HARDY LOUIS III

Role SVP, HUMAN RESOURCES

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	401	$78.34	$31K

Holdings After Transaction: Common Stock — 10,161 shares (Direct)

Footnotes (1)

1. F1. Shares withheld to settle income tax liability incurred upon vesting of restricted stock unit award on February 27, 2026.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Innospec (IOSP) report for Hardy Louis Griffin III?

Innospec reported a tax-related insider transaction where Hardy Louis Griffin III had 401 common shares withheld. These shares were automatically used to cover income tax from a restricted stock unit vesting, rather than being sold in the open market.

Was the Innospec (IOSP) Form 4 transaction an open-market sale?

No, the Form 4 for Innospec shows a tax-withholding disposition, not an open-market sale. Shares were withheld upon restricted stock unit vesting to satisfy income tax liability, a common administrative feature of equity compensation programs.

How many Innospec (IOSP) shares were withheld for taxes in this Form 4?

The Form 4 reports that 401 Innospec common shares were withheld. The withholding price was $78.34 per share, and the transaction was classified as a tax-withholding disposition tied to the vesting of a restricted stock unit award.

How many Innospec (IOSP) shares does Hardy Louis Griffin III own after this transaction?

After the tax-withholding disposition, Hardy Louis Griffin III directly owns 10,161 Innospec common shares. This balance reflects his remaining equity position following the automatic share withholding to cover income tax due on the award vesting.

What does transaction code “F” mean in the Innospec (IOSP) Form 4?

Transaction code “F” indicates payment of an exercise price or tax liability by delivering or withholding securities. In this Innospec filing, it reflects shares withheld from a restricted stock unit vesting to settle the insider’s income tax obligation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

GRIFFIN HARDY LOUIS III

(Last) (First) (Middle)

8310 SOUTH VALLEY HIGHWAY

SUITE 350

(Street)

ENGLEWOOD CO 80112

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
INNOSPEC INC. [ IOSP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, HUMAN RESOURCES

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/27/2026		F		401(1)	D	$78.34	10,161	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares withheld to settle income tax liability incurred upon vesting of restricted stock unit award on February 27, 2026.

	Hardy L. Griffin	03/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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