Robert J. Chersi - 14 May 2026 Form 4 Insider Report for Acadian Asset Management Inc. (AAMI)

Reporting relationship: Director
Issuer ticker: AAMI
Reported as of: 14 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 May 2026, 16:06:14 UTC
Prior SEC filing: 12 Feb 2026
Next SEC filing: 15 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Richard J. Hart, By POA for Robert J. Chersi

Key filing fact

Robert J. Chersi filed Form 4 for Acadian Asset Management Inc. (AAMI) on 18 May 2026.

Key facts

This page summarizes Robert J. Chersi's Form 4 filing for Acadian Asset Management Inc. (AAMI).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 18 May 2026, 16:06.

Change

Previous filing in this sequence was filed on 12 Feb 2026.
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 0001668247 Primary reporting owner

Chersi Robert J

Relationship: Director
Address: C/O ACADIAN ASSET MANAGEMENT INC., 200 STATE STREET, SUITE 601A, BOSTON
Signature: /s/ Richard J. Hart, By POA for Robert J. Chersi
Signature date: 18 May 2026

Reported non-derivative transactions

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

AAMI transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,286
Change %
Price: $0.000000^*
Shares after: 3,286
Date: 14 May 2026
Ownership: Direct

AAMI holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 37,384
Date: 14 May 2026
Ownership: By Robert J. Chersi 2012 Family Trust
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AAMI transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -3,286
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 14 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,286
Exercise price
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

These shares are held in trust for the benefit of the reporting person's children. The reporting person's spouse is the trustee of the trust.

Footnote F2

Each restricted stock unit represents a right to receive one share of common stock of Acadian Asset Management Inc.

Footnote F3

On May 14, 2025, the reporting person was granted 3,286 restricted stock units vesting upon the earlier of May 14, 2026 and the date of the 2026 annual meeting of stockholders of Acadian Asset Management Inc.