[SCHEDULE 13G/A] Acadian Asset Management Inc. SEC Filing

Rhea-AI Filing Summary

Empyrean Capital Partners, LP and Amos Meron filed an amended Schedule 13G reporting beneficial ownership of 1,541,108 shares of Acadian Asset Management Inc. common stock, representing 4.3% of the class.

The filing lists shared voting and dispositive power over 1,541,108 shares and no sole voting or dispositive power. The percentage is calculated using 35,811,913 shares outstanding as of August 5, 2025, as noted in the company’s Form 10-Q. The certification states the securities were acquired and are held in the ordinary course and not to change or influence control.

The issuer’s name changed from BrightSphere Investment Group to Acadian Asset Management Inc. on January 2, 2025. The reported event date is September 30, 2025.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Acadian Asset Management Inc.

(Name of Issuer)

Common stock, par value $0.001 per share

(Title of Class of Securities)

10948W103

(CUSIP Number)

09/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 10948W103

1

Names of Reporting Persons

Empyrean Capital Partners, LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,541,108.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,541,108.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,541,108.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.3 %

12

Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: Original filing was under BrightSphere Investment Group. On January 2, 2025, the name was changed to Acadian Asset Management.

SCHEDULE 13G

CUSIP No. 10948W103

1

Names of Reporting Persons

Meron Amos

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,541,108.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,541,108.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,541,108.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.3 %

12

Type of Reporting Person (See Instructions)

HC, IN

Comment for Type of Reporting Person: Original filing was under BrightSphere Investment Group. On January 2, 2025, the name was changed to Acadian Asset Management.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Acadian Asset Management Inc.
(b)	Address of issuer's principal executive offices: 200 State Street, Suite 601A, Boston, Massachusetts, 02109
Item 2.
(a)	Name of person filing: This statement is filed by: (i) Empyrean Capital Partners, LP ("ECP"), a Delaware limited partnership, which serves as investment manager to Empyrean Capital Overseas Master Fund, Ltd. ("ECOMF"), a Cayman Islands exempted company, with respect to the shares of common stock, par value $0.001 per share (the "Common stock") of Acadian Asset Management (the "Company") directly held by ECOMF; (ii) Mr. Amos Meron, who serves as the managing member of Empyrean Capital, LLC, the general partner of ECP, with respect to the shares of Common stock directly held by ECOMF. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party. The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of shares of Common stock owned by another Reporting Person.
(b)	Address or principal business office or, if none, residence: The address of the business office of each of the Reporting Persons is c/o Empyrean Capital Partners, L.P., 10250 Constellation Boulevard, Suite 2950, Los Angeles, CA 90067
(c)	Citizenship: ECP - a Delaware limited partnership Amos Meron - United States
(d)	Title of class of securities: Common stock, par value $0.001 per share
(e)	CUSIP No.: 10948W103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,541,108
(b)	Percent of class: 4.3%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,541,108
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,541,108 The percentages used in this Schedule 13G are calculated based upon 35,811,913 shares of Common Stock outstanding as of August 5, 2025, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2025, filed with the Securities and Exchange Commission on August 7, 2025.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Empyrean Capital Partners, LP

Signature:	/s/ Jennifer Norman
Name/Title:	Chief Compliance Officer
Date:	11/14/2025

Meron Amos

Signature:	/s/ Amos Meron
Name/Title:	Amos Meron
Date:	11/14/2025

Exhibit Information

Exhibit 99.1 Joint Filing Agreement

FAQ

What did Empyrean disclose in the AAMI Schedule 13G/A?

They reported 1,541,108 shares of Acadian Asset Management Inc. common stock, equal to 4.3% of the class.

How much voting power did the reporting persons indicate?

They reported shared voting and dispositive power over 1,541,108 shares and no sole power.

What share count was used to compute the 4.3% stake in AAMI?

The filing cites 35,811,913 shares outstanding as of August 5, 2025 from the company’s Form 10-Q.

Is this a passive ownership filing under Schedule 13G?

Yes. The certification states the securities were acquired and are held in the ordinary course and not to change or influence control.

Who are the reporting persons in this 13G/A for AAMI?

The reporting persons are Empyrean Capital Partners, LP and Amos Meron.

Did Acadian Asset Management recently change its name?

Yes. The filing notes the issuer’s name changed from BrightSphere Investment Group to Acadian Asset Management on January 2, 2025.

What is the event date for this ownership report?

The event date disclosed is September 30, 2025.