Director at Innospec (NASDAQ: IOSP) sells 594 common shares

Rhea-AI Filing Summary

Innospec Inc. director Milton C. Blackmore reported an open-market sale of 594 shares of Innospec common stock. The transaction took place on February 27, 2026 at a price of $76.5562 per share. After this sale, he directly owns 10,530 shares of Innospec.

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

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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^*

Blackmore Milton C

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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		S		594	D	$76.5562	10,530	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:

	Milton C. Blackmore	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.
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FAQ

What insider transaction did Innospec (IOSP) report on this Form 4?

Innospec reported that director Milton C. Blackmore sold 594 shares of common stock. The sale was an open-market transaction at $76.5562 per share on February 27, 2026, and reflects a routine disposition by a board member.

How many Innospec (IOSP) shares did Milton C. Blackmore sell and at what price?

Milton C. Blackmore sold 594 shares of Innospec common stock. The shares were sold in an open-market transaction at a price of $76.5562 per share, according to the Form 4 insider trading report filed for this transaction.

What is Milton C. Blackmore’s remaining Innospec (IOSP) shareholding after this sale?

After the February 27, 2026 sale, Milton C. Blackmore directly owns 10,530 Innospec shares. This post-transaction balance is reported in the Form 4 and reflects his continuing equity stake as a director of the company.

When did the reported Innospec (IOSP) insider sale by Milton C. Blackmore occur?

The insider sale took place on February 27, 2026. On that date, director Milton C. Blackmore executed an open-market sale of 594 Innospec common shares at $76.5562 per share, as detailed in the Form 4 filing.

Was the Innospec (IOSP) insider transaction a buy or a sell?

The transaction was a sale of Innospec shares. Director Milton C. Blackmore executed an open-market sale of 594 common shares at $76.5562 per share, and the filing classifies the transaction direction as a sell.

Is Milton C. Blackmore’s Innospec (IOSP) transaction direct or indirect ownership?

The Form 4 classifies Milton C. Blackmore’s holdings as directly owned. The 594 shares sold and the 10,530 shares reported as remaining after the sale are both listed under direct ownership, with no intermediary entity noted.