Innospec (NASDAQ: IOSP) SVP disposes shares for tax withholding

Rhea-AI Filing Summary

Innospec Inc. SVP Corbin Barnes reported a tax-related share disposition. On February 27, 2026, 166 shares of common stock were withheld at $78.34 per share to cover income taxes due upon vesting of a restricted stock unit award. After this tax-withholding transaction, Barnes directly held 13,079.6117 Innospec common shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider BARNES CORBIN

Role SVP, Corporate Dev and IR

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	166	$78.34	$13K

Holdings After Transaction: Common Stock — 13,079.612 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^*

BARNES CORBIN

(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, Corporate Dev and IR

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		166(1)	D	$78.34	13,079.6117	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.

	Corbin Barnes	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 did Innospec (IOSP) executive Corbin Barnes report in this Form 4?

Corbin Barnes, an Innospec senior vice president, reported a tax-related share disposition. The company withheld 166 common shares to satisfy income tax obligations triggered when a restricted stock unit award vested on February 27, 2026, rather than an open-market sale of shares.

How many Innospec (IOSP) shares were disposed of in this insider filing?

The filing shows 166 Innospec common shares were disposed of. These shares were withheld by the company at vesting of a restricted stock unit award to cover Barnes’ income tax liability, instead of being sold on the open market for cash proceeds.

Was the Innospec (IOSP) insider transaction an open-market sale of shares?

No, the transaction was not an open-market sale. The 166 shares were withheld to settle income tax liability when a restricted stock unit award vested, a common administrative mechanism to cover taxes rather than a discretionary decision to sell shares in the market.

At what price were the withheld Innospec (IOSP) shares valued in this Form 4?

The 166 withheld Innospec common shares were valued at $78.34 per share. This price is used in the Form 4 to calculate the value of shares applied toward Barnes’ income tax obligation arising from the vesting of his restricted stock unit award.

How many Innospec (IOSP) shares does Corbin Barnes hold after this transaction?

After the tax-withholding disposition, Barnes directly holds 13,079.6117 Innospec common shares. This post-transaction balance reflects his remaining direct ownership following the withholding of 166 shares to satisfy income tax obligations from a restricted stock unit vesting event.

What role does Corbin Barnes hold at Innospec (IOSP) in this insider report?

Corbin Barnes is identified as Innospec’s Senior Vice President, Corporate Development and Investor Relations. The Form 4 reflects his personal equity activity, specifically shares withheld for taxes when a restricted stock unit award vested on February 27, 2026.