Acadian Asset Management (AAMI) director converts 3,286 RSUs into stock

Rhea-AI Filing Summary

Acadian Asset Management Inc. director Robert J. Chersi reported routine equity compensation activity and updated holdings. On May 14, 2026, he exercised 3,286 restricted stock units into 3,286 shares of common stock at a stated price of $0.00 per share, leaving him with 3,286 shares held directly.

He is also reported as having indirect ownership of 37,384 shares of common stock through the Robert J. Chersi 2012 Family Trust, which holds shares for the benefit of his children and has his spouse as trustee. The filing shows no open‑market purchases or sales and no remaining derivative position from these restricted stock units.

Insights

Equity compensation analyst

Routine RSU vesting into 3,286 shares with no open‑market trades.

Director Robert J. Chersi converted 3,286 restricted stock units into 3,286 common shares of Acadian Asset Management Inc. on May 14, 2026. The transaction is coded "M", indicating an exercise or conversion of a derivative security rather than an open‑market purchase.

After this event, he holds 3,286 shares directly and reports 37,384 shares indirectly through the Robert J. Chersi 2012 Family Trust, which benefits his children and is administered by his spouse as trustee. The derivative position associated with these RSUs is now fully settled, with no remaining units shown.

The absence of any reported buys or sells and the zero exercise price suggest standard director compensation vesting instead of discretionary trading. For investors, this reads as administrative and compensation‑related, not a directional signal about the company’s valuation or prospects.

Insider Trade Summary

3,286 shares exercised/converted

Mixed 3 txns

Insider Chersi Robert J

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	3,286	$0.00	--
Exercise	Common Stock	3,286	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 3,286 shares (Direct, null); Common Stock — 37,384 shares (Indirect, By Robert J. Chersi 2012 Family Trust)

Footnotes (1)

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

Key Figures

RSUs exercised: 3,286 units Shares received: 3,286 shares Exercise price: $0.00 per share +3 more

6 metrics

RSUs exercised 3,286 units Restricted stock units converted to common stock on May 14, 2026

Shares received 3,286 shares Common stock received from RSU conversion, held directly

Exercise price $0.00 per share Stated transaction price for RSU conversion

Direct holdings after transaction 3,286 shares Total common shares held directly by Robert J. Chersi

Indirect trust holdings 37,384 shares Common shares held by Robert J. Chersi 2012 Family Trust

Derivative exercises 1 transaction, 3,286 shares Exercise of derivative security coded "M" in this Form 4

Key Terms

Restricted Stock Units, derivative security, indirect ownership, Family Trust, +1 more

5 terms

Restricted Stock Units financial

"The security titled "Restricted Stock Units" was exercised into common stock."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

derivative security financial

"The transaction code description notes an exercise or conversion of a derivative security."

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

indirect ownership financial

"Shares are reported with ownership type "indirect" through the Robert J. Chersi 2012 Family Trust."

Family Trust financial

"These shares are held in trust for the benefit of the reporting person's children."

exercise or conversion financial

"Transaction code "M" is described as an exercise or conversion of derivative security."

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Chersi Robert J

(Last) (First) (Middle)

C/O ACADIAN ASSET MANAGEMENT INC.

200 STATE STREET, SUITE 601A

(Street)

BOSTON MASSACHUSETTS 02109

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Acadian Asset Management Inc. [ AAMI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/14/2026		M		3,286	A	$0	3,286	D
Common Stock								37,384	I	By Robert J. Chersi 2012 Family Trust(1)

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
Restricted Stock Units(2)	(2)	05/14/2026		M			3,286	(3)	(3)	Common Stock	3,286	$0	0	D

Explanation of Responses:

1. 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.

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

3. 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.

Remarks:

	/s/ Richard J. Hart, By POA for Robert J. Chersi	05/18/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Acadian Asset Management (AAMI) director Robert J. Chersi report?

Robert J. Chersi reported converting 3,286 restricted stock units into 3,286 shares of Acadian common stock. The transaction used code "M", indicating an exercise or conversion of a derivative security rather than an open‑market trade, and appears to be routine equity compensation.

Did Robert J. Chersi buy or sell Acadian Asset Management (AAMI) shares on the open market?

No open‑market buys or sells were reported in this filing. The only transaction was the exercise of 3,286 restricted stock units into common shares at a stated price of $0.00 per share, which is typical for vested equity awards granted as compensation.

How many Acadian Asset Management (AAMI) shares does Robert J. Chersi hold directly after this Form 4?

Following the restricted stock unit conversion, Robert J. Chersi holds 3,286 shares of Acadian common stock directly. This reflects the full 3,286 units exercised into an equal number of shares, with no remaining derivative balance tied to those specific restricted stock units.

What indirect Acadian Asset Management (AAMI) holdings are associated with Robert J. Chersi?

The filing reports 37,384 Acadian common shares held indirectly through the Robert J. Chersi 2012 Family Trust. Footnotes state these shares are held in trust for his children, with his spouse serving as trustee, clarifying the nature of this indirect ownership relationship.

What are the terms of the restricted stock units reported by Robert J. Chersi at Acadian Asset Management (AAMI)?

Each restricted stock unit represents a right to receive one share of Acadian common stock. A prior grant on May 14, 2025 awarded 3,286 units that vested upon the earlier of May 14, 2026 and the 2026 annual meeting of stockholders, triggering this share delivery.