Innospec (IOSP) CFO Cleminson sells 2,380 shares in amended Form 4/A

Rhea-AI Filing Summary

Innospec Inc. executive Ian Cleminson, EVP & CFO, reported amended insider stock sales. On February 27, 2026, he sold a total of 2,380 shares of Innospec common stock in two open-market transactions at weighted average prices of $76.30 and $76.79 per share. After these sales, he directly owned 20,357 shares of common stock. The amendment corrects previously reported transaction prices and notes the shares were sold in multiple trades within price ranges from $75.5001 to $76.55 and from $76.555 to $77.0713.

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

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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^*

Cleminson Ian

(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)
	EVP & CFO

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
03/03/2026

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		S		1,149	D	$76.3(1)	21,588	D
Common Stock	02/27/2026		S		1,231	D	$76.79(2)	20,357	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. 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.

2. 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.

	Ian Philip Cleminson	03/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did Innospec (IOSP) report for EVP & CFO Ian Cleminson?

Innospec reported that EVP & CFO Ian Cleminson sold a total of 2,380 shares of the company’s common stock on February 27, 2026. The sales were executed as open-market transactions at weighted average prices of $76.30 and $76.79 per share.

How many Innospec (IOSP) shares does Ian Cleminson hold after the reported sales?

After the reported transactions, Ian Cleminson directly owned 20,357 shares of Innospec common stock. This figure reflects his holdings following completion of the second open-market sale disclosed for February 27, 2026, as shown in the amended Form 4/A filing.

What were the price ranges for Ian Cleminson’s Innospec (IOSP) stock sales?

The filing states that Cleminson’s sales occurred in multiple trades within specific ranges. One transaction involved prices from $75.5001 to $76.55, while the other covered prices from $76.555 to $77.0713, with reported figures representing weighted average sale prices.

Why was the Innospec (IOSP) Form 4/A filed as an amendment?

The Form 4/A was filed to correct the transaction prices previously reported. It clarifies that the disclosed prices are weighted average sale prices and that the underlying sales were executed through multiple trades across the specified price ranges on February 27, 2026.

Were Ian Cleminson’s Innospec (IOSP) transactions open-market sales?

Yes. The transactions are identified as open-market sales of Innospec common stock, coded as “S” for sale. Both entries in the filing classify the activity as non-derivative, open-market sales of 1,149 shares and 1,231 shares, respectively, on February 27, 2026.

How many Innospec (IOSP) shares did Ian Cleminson sell in each transaction?

The filing shows two separate transactions. Cleminson sold 1,149 shares at a weighted average price of $76.30 per share and 1,231 shares at a weighted average price of $76.79 per share, totaling 2,380 shares sold on February 27, 2026.