Jennison Associates (AAMI) reports 1.53M-share, 4.3% holding in Acadian

Rhea-AI Filing Summary

Jennison Associates LLC filed an amended Schedule 13G reporting a passive ownership position in Acadian Asset Management Inc. common stock. Jennison reports beneficial ownership of 1,526,570 shares, representing 4.3% of the class as of June 30, 2026.

Jennison has sole voting power over 1,526,570 shares and shared dispositive power over 1,526,570 shares, with no shared voting power and no sole dispositive power. The filing is signed by a Senior Vice President, Compliance, on August 3, 2026.

Key Figures

Beneficially owned shares: 1,526,570 shares Percent of class: 4.3% Sole voting power: 1,526,570 shares +3 more

6 metrics

Beneficially owned shares 1,526,570 shares Jennison Associates LLC beneficial ownership of AAMI common stock

Percent of class 4.3% Portion of AAMI common stock class beneficially owned by Jennison

Sole voting power 1,526,570 shares Shares over which Jennison has sole power to vote

Shared dispositive power 1,526,570 shares Shares over which Jennison has shared power to dispose

CUSIP 10948W103 CUSIP for Acadian Asset Management Inc. common stock

Ownership date reference 06/30/2026 Date tied to reported ownership percentages

Key Terms

beneficially owned, sole voting power, shared dispositive power, Percent of class, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 1526570"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole power to vote or to direct the vote: 1526570"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared dispositive power financial

"Shared power to dispose or to direct the disposition of: 1526570"

Percent of class financial

"(b) | Percent of class: 4.3 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Schedule 13G regulatory

"ACADIAN ASSET MANAGEMENT INC Common Stock 10948W103 06/30/2026 schemaVersion"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/03/2026 - 10:47 AM Accepted by SEC EDGAR 08/03/2026 - 10:47 AM Learn about SEC filing dates

FAQ

What ownership stake in AAMI does Jennison Associates report on this Schedule 13G/A?

Jennison Associates reports beneficial ownership of 1,526,570 shares of Acadian Asset Management Inc. (AAMI) common stock, representing 4.3% of the outstanding class as of June 30, 2026.

How much voting power does Jennison Associates have over AAMI shares?

Jennison Associates has sole voting power over 1,526,570 shares of AAMI common stock and no shared voting power, according to the Schedule 13G/A filing.

What dispositive power over AAMI shares does Jennison Associates disclose?

Jennison Associates reports shared dispositive power over 1,526,570 shares of AAMI common stock and no sole dispositive power, meaning disposition decisions are shared with another party.

Who is the reporting person on the AAMI Schedule 13G/A and where are they based?

The reporting person is Jennison Associates LLC, a U.S. entity with its principal office at 55 East 52nd Street, New York, NY 10055, as disclosed in the Schedule 13G/A.

Who signed the Schedule 13G/A related to AAMI on behalf of Jennison Associates?

The filing is signed by Beata Markowicz, identified as Senior Vice President, Compliance, with a signature date of August 3, 2026.

What class of AAMI securities is covered by Jennison Associates' Schedule 13G/A?

The filing covers Common Stock of Acadian Asset Management Inc. (AAMI), identified by CUSIP 10948W103, as stated in the Schedule 13G/A.

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

(Title of Class of Securities)

10948W103

(CUSIP Number)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 10948W103

1

Names of Reporting Persons

Jennison Associates LLC

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 1,526,570.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,526,570.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,526,570.00

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

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, MA 02109
Item 2.
(a)	Name of person filing: Jennison Associates LLC
(b)	Address or principal business office or, if none, residence: 55 East 52nd Street, New York, NY 10055
(c)	Citizenship: USA
(d)	Title of class of securities: Common Stock
(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: 1526570
(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: 1526570
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1526570
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.

Jennison Associates LLC

Signature:	Beata Markowicz
Name/Title:	Senior Vice President, Compliance
Date:	08/03/2026