Elizabeth K. Arnold - 23 Feb 2026 Form 4 Insider Report for INNOSPEC INC. (IOSP)

Reporting relationship: Director
Issuer ticker: IOSP
Reported as of: 23 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 25 Feb 2026, 17:26:13 UTC
Prior SEC filing: 15 May 2025
Next SEC filing: 13 Apr 2026
Source filing: View source filing
Reporting owner signature: Elizabeth K Arnold

Key filing fact

Elizabeth K. Arnold filed Form 4 for INNOSPEC INC. (IOSP) on 25 Feb 2026.

Key facts

This page summarizes Elizabeth K. Arnold's Form 4 filing for INNOSPEC INC. (IOSP).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 25 Feb 2026, 17:26.

Change

Previous filing in this sequence was filed on 15 May 2025.
Current net transaction value: $0.

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 disclosures.

View source filing

Reporting Owners (1)

CIK 0001785365 Primary reporting owner

Arnold Elizabeth K

Relationship: Director
Address: 8310 SOUTH VALLEY HIGHWAY, SUITE 350, ENGLEWOOD
Signature: Elizabeth K Arnold
Signature date: 25 Feb 2026

Reported non-derivative transactions

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

IOSP transaction

Common Stock

Award

Transaction value: $0
Shares: +1,539
Change %: +32%
Price: $0.000000
Shares after: 6,376
Date: 23 Feb 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Represents Restricted Stock Units ("RSUs") vesting in full on February 23, 2029, granted by Issuer in connection with Reporting Person's service as a non-employee director.