Acadian Asset Management (AAMI) CLO Hart sells 100K common shares

Rhea-AI Filing Summary

Acadian Asset Management Inc. chief legal and administrative officer Richard Jonathan Hart reported selling a total of 100,000 shares of Common Stock in open-market transactions on May 4, 2026. The sales were executed at weighted average prices around the high-$60 range across multiple trades.

One block of 11,208 shares was sold at a weighted average price of $67.7269 per share, and another block of 88,792 shares was sold at a weighted average price of $66.8747 per share. Following these transactions, Hart directly holds 85,071 shares of Acadian Asset Management Inc. common stock.

Insider Trade Summary

Net Seller: 100,000 shares ($6,697,021)

Net Sell 2 txns

Insider Hart Richard Jonathan

Role CLO and CAO

Sold 100,000 shs ($6.70M)

Type	Security	Shares	Price	Value
Sale	Common Stock	88,792	$66.8747	$5.94M
Sale	Common Stock	11,208	$67.7269	$759K

Holdings After Transaction: Common Stock — 85,071 shares (Direct, null)

Footnotes (1)

1. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.55 to $67.47, inclusive. The reporting person undertakes to provide to Acadian Asset Management Inc., any securityholder of Acadian Asset Management Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.56 to $67.84, inclusive. The reporting person undertakes to provide to Acadian Asset Management Inc., any securityholder of Acadian Asset Management Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.

Key Figures

Shares sold (block 1): 11,208 shares Price per share (block 1): $67.7269 per share Shares sold (block 2): 88,792 shares +3 more

6 metrics

Shares sold (block 1) 11,208 shares Common Stock sold May 4, 2026 at weighted avg $67.7269

Price per share (block 1) $67.7269 per share Weighted average sale price for 11,208 shares on May 4, 2026

Shares sold (block 2) 88,792 shares Common Stock sold May 4, 2026 at weighted avg $66.8747

Price per share (block 2) $66.8747 per share Weighted average sale price for 88,792 shares on May 4, 2026

Total shares sold 100,000 shares Aggregate common shares sold across two open-market transactions

Shares held after transactions 85,071 shares Direct common stock holdings following May 4, 2026 sales

Key Terms

open-market sale, weighted average price, Common Stock, transaction code "S"

4 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average price financial

"The price reported in column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

transaction code "S" financial

""transaction_code": "S""

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^*

Hart Richard Jonathan

(Last) (First) (Middle)

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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

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	05/04/2026		S		88,792	D	$66.8747(1)	85,071	D
Common Stock	05/04/2026		S		11,208	D	$67.7269(2)	73,863	D

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

Explanation of Responses:

1. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.55 to $67.47, inclusive. The reporting person undertakes to provide to Acadian Asset Management Inc., any securityholder of Acadian Asset Management Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.

2. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.56 to $67.84, inclusive. The reporting person undertakes to provide to Acadian Asset Management Inc., any securityholder of Acadian Asset Management Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.

Remarks:

	/s/ Richard J. Hart	05/05/2026
	** 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 AAMI executive Richard Jonathan Hart report?

Richard Jonathan Hart reported selling 100,000 shares of Acadian Asset Management Inc. Common Stock in open-market transactions on May 4, 2026. The filing shows two separate sale blocks executed at weighted average prices in the high-$60 range.

How many AAMI shares does Richard Jonathan Hart hold after the reported sales?

After the reported transactions, Richard Jonathan Hart directly holds 85,071 shares of Acadian Asset Management Inc. common stock. This post-transaction holding reflects his remaining direct ownership stake disclosed in the Form 4 filing for May 4, 2026.

At what prices did Richard Jonathan Hart sell AAMI common stock?

Hart sold 11,208 AAMI shares at a weighted average price of $67.7269 and 88,792 shares at a weighted average price of $66.8747. Footnotes explain these were multiple trades within narrow price ranges around those averages.

What do the Form 4 footnotes say about Richard Hart’s AAMI share sales?

The footnotes state each reported price is a weighted average for multiple trades. Shares were sold in several transactions within specified price ranges, and Hart undertakes to provide detailed trade-level pricing information upon request to the company, shareholders, or SEC staff.

Was Richard Jonathan Hart’s AAMI transaction an open-market sale or another type?

The filing classifies both transactions as open-market sales of non-derivative common stock, using transaction code “S.” This indicates routine stock market or private sale activity rather than an option exercise, tax withholding, gift, or derivative-related event.