David Landless - 27 Feb 2026 Form 4/A - Amendment Insider Report for INNOSPEC INC. (IOSP)

Reporting relationship: Director
Issuer ticker: IOSP
Reported as of: 27 Feb 2026
Net transaction value: -$45,473
SEC form: 4/A - Amendment
Accepted by SEC: 06 Mar 2026, 17:31:45 UTC
Original report date: 03 Mar 2026
Prior SEC filing: 24 Feb 2026
Source filing: View source filing
Reporting owner signature: David Landless

Key filing fact

David Landless filed Form 4/A - Amendment for INNOSPEC INC. (IOSP) on 06 Mar 2026.

Key facts

This page summarizes David Landless's Form 4/A - Amendment filing for INNOSPEC INC. (IOSP).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 06 Mar 2026, 17:31.

Change

Previous filing in this sequence was filed on 24 Feb 2026.
Current net transaction value: -$45,473.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001667356 Primary reporting owner

LANDLESS DAVID

Relationship: Director
Address: 8310 SOUTH VALLEY HIGHWAY, SUITE 350, ENGLEWOOD
Signature: David Landless
Signature date: 06 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

IOSP transaction

Common Stock

Sale

Transaction value: $21,898
Shares: -287
Change %: -3.5%
Price: $76.30
Shares after: 7,939
Date: 27 Feb 2026
Ownership: Direct
Footnotes: F1

IOSP transaction

Common Stock

Sale

Transaction value: $23,575
Shares: -307
Change %: -3.9%
Price: $76.79
Shares after: 7,632
Date: 27 Feb 2026
Ownership: Direct
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote 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.

Footnote 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.