Innospec (IOSP) CEO uses 7,966 shares to cover tax from RSU vesting

Rhea-AI Filing Summary

Innospec Inc. President & CEO Patrick Williams reported a tax-related share disposition. On February 27, 2026, 7,966 shares of common stock were withheld at $78.34 per share to settle income tax owed on a restricted stock unit vesting, leaving him with 231,535 shares held directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Williams Patrick

Role PRESIDENT & CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	7,966	$78.34	$624K

Holdings After Transaction: Common Stock — 231,535 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

Williams Patrick

(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)
	PRESIDENT & CEO

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		7,966(1)	D	$78.34	231,535	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.

	Patrick Williams	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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Innospec (IOSP) report for its CEO?

Innospec (IOSP) reported that President & CEO Patrick Williams had 7,966 shares of common stock withheld on February 27, 2026. The shares were used to settle income tax from a restricted stock unit vesting, not as an open-market trade.

How many Innospec (IOSP) shares were involved in Patrick Williams’ Form 4?

The Form 4 shows 7,966 shares of Innospec common stock were withheld. These shares were applied to cover income tax liabilities triggered when a restricted stock unit award vested on February 27, 2026, according to the footnote disclosure.

What price per share was used for the Innospec (IOSP) tax-withholding transaction?

The tax-withholding disposition used a price of $78.34 per share. This price applies to the 7,966 shares of Innospec common stock withheld to satisfy the income tax liability from the vesting restricted stock unit award on February 27, 2026.

How many Innospec (IOSP) shares does Patrick Williams hold after this transaction?

After the tax-withholding transaction, Patrick Williams directly owned 231,535 shares of Innospec common stock. This post-transaction holding figure is reported in the Form 4 as the total shares beneficially owned following the February 27, 2026 disposition.

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

Transaction code F indicates a payment of an exercise price or tax liability by delivering securities. In this case, it reflects shares of Innospec common stock withheld to settle income tax due when Patrick Williams’ restricted stock unit award vested on February 27, 2026.