The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL
OMB Number: 3235-0006
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Report for the Calendar Year or Quarter Ended: 09-30-2025
Check here if Amendment    Amendment Number:
This Amendment (Check only one.):    is a restatement.
   adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: Acadian Inc
Address: 200 STATE ST., SUITE 601A
BOSTON, MA  02109
Form 13F File Number: 028-11931
CRD Number (if applicable):
SEC File Number (if applicable):

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name: Patrick Golden
Title: Investment Operations and Compliance Manager
Phone: 6172590015
Signature, Place, and Date of Signing:
Patrick Golden HolbrookMA 10-02-2025
[Signature] [City, State] [Date]
Acadian Inc. ("Acadian") is the operating U.S. holding company of certain asset management subsidiaries of Acadian Asset Managment Inc that are subject to applicable 13F filing requirements. Acadian expressly disclaims beneficial ownership of all reported securities. Acadian does not exercise voting or investment power over any reported security. Each Acadian asset management firm exercises such power independently of Acadian and one another.
Report Type (Check only one.):
   13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
X 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
   13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
Name Form 13F File No. CRD No. (if applicable) SEC File No. (if applicable) CIK
ACADIAN ASSET MANAGEMENT LLC 028-05990     0000916542