Ian Philip Cleminson - 27 Feb 2026 Form 4/A - Amendment Insider Report for INNOSPEC INC. (IOSP)

Role: EVP & CFO
Signature: Ian Philip Cleminson
Issuer symbol: IOSP
Transactions as of: 27 Feb 2026
Net transactions value: -$182,197
Form type: 4/A - Amendment
Filing time: 06 Mar 2026, 17:28:56 UTC
Date Of Original Report: 03 Mar 2026
Previous filing: 25 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cleminson Ian	EVP & CFO	8310 SOUTH VALLEY HIGHWAY, SUITE 350, ENGLEWOOD	Ian Philip Cleminson	06 Mar 2026	0001368260

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IOSP	Common Stock	Sale	$87,669	-1,149	-5.1%	$76.30	21,588	27 Feb 2026	Direct	F1
transaction	IOSP	Common Stock	Sale	$94,528	-1,231	-5.7%	$76.79	20,357	27 Feb 2026	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This Form 4/A amends the Form 4 filed on March 3, 2026 to correct the transaction price reported in Table I. The price reported reflects the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $75.5001 to $76.55. The reporting person undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
F2	This Form 4/A amends the Form 4 filed on March 3, 2026 to correct the transaction price reported in Table I. The price reported reflects the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $76.555 to $77.0713. The reporting person undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Content

This Form 4/A amends the Form 4 filed on March 3, 2026 to correct the transaction price reported in Table I. The price reported reflects the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $75.5001 to $76.55. The reporting person undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

This Form 4/A amends the Form 4 filed on March 3, 2026 to correct the transaction price reported in Table I. The price reported reflects the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $76.555 to $77.0713. The reporting person undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.