Barbara Trebbi - 12 Jun 2026 Form 4 Insider Report for Acadian Asset Management Inc. (AAMI)

Reporting relationship: Director
Issuer ticker: AAMI
Reported as of: 12 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 Jun 2026, 18:52:58 UTC
Prior SEC filing: 18 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Richard J. Hart, By POA for Barbara Trebbi

Key filing fact

Barbara Trebbi filed Form 4 for Acadian Asset Management Inc. (AAMI) on 15 Jun 2026.

Key facts

This page summarizes Barbara Trebbi's Form 4 filing for Acadian Asset Management Inc. (AAMI).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 15 Jun 2026, 18:52.

Change

Previous filing in this sequence was filed on 18 May 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 0001730619 Primary reporting owner

Trebbi Barbara

Relationship: Director
Address: C/O ACADIAN ASSET MANAGEMENT INC., 200 STATE STREET, SUITE 601A, BOSTON
Signature: /s/ Richard J. Hart, By POA for Barbara Trebbi
Signature date: 15 Jun 2026

Reported non-derivative transactions

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

AAMI transaction

Common Stock

Gift

Transaction value
Shares: -10,260
Change %: -26%
Price: $0.000000^*
Shares after: 28,797
Date: 15 Jun 2026
Ownership: Direct

AAMI transaction

Common Stock

Gift

Transaction value
Shares: +10,260
Change %
Price: $0.000000^*
Shares after: 10,260
Date: 15 Jun 2026
Ownership: Landry Trebbi 2012 Family Grantor Trust dated 12/31/2012
Footnotes: F1

Reported derivative securities

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

AAMI transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +1,288
Change %
Price: $0.000000^*
Shares after: 1,288
Date: 12 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,288
Exercise price
Footnotes: F2, F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

These shares are held in a trust for the benefit of the reporting person's child. The reporting person, the reporting person's spouse and a third party are trustees 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

Consists of restricted stock units under the Acadian Asset Management Inc. 2026 Equity Incentive Plan.

Footnote F4

On June 12, 2026, the reporting person was granted 1,288 restricted stock units vesting upon the earlier of June 12, 2027 and the date of the 2027 annual meeting of stockholders of Acadian Asset Management Inc.