Christina Wiater - 13 Feb 2026 Form 4 Insider Report for Acadian Asset Management Inc. (AAMI)

Role: PFO / PAO
Signature: /s/ Richard J. Hart, By POA for Christina Wiater
Issuer symbol: AAMI
Transactions as of: 13 Feb 2026
Net transactions value: -$139,839
Form type: 4
Filing time: 18 Feb 2026, 17:15:59 UTC
Previous filing: 19 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Wiater Christina	PFO / PAO	200 STATE STREET, SUITE 601A, BOSTON	/s/ Richard J. Hart, By POA for Christina Wiater	18 Feb 2026	0001806909

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AAMI	Common Stock	Options Exercise	$0	+4,006	+21%	$0.000000	23,131	14 Feb 2026	Direct
transaction	AAMI	Common Stock	Tax liability	$60,976	-1,176	-5.1%	$51.85	21,955	14 Feb 2026	Direct
transaction	AAMI	Common Stock	Options Exercise	$0	+5,180	+24%	$0.000000	27,135	15 Feb 2026	Direct
transaction	AAMI	Common Stock	Tax liability	$78,864	-1,521	-5.6%	$51.85	25,614	15 Feb 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AAMI	Restricted Stock Units	Award	$0	+5,407	+26%	$0.000000	26,432	13 Feb 2026	Common Stock	5,407	$0.000000	Direct	F1, F2
transaction	AAMI	Restricted Stock Units	Options Exercise	$0	-4,006	-15%	$0.000000	22,426	14 Feb 2026	Common Stock	4,006	$0.000000	Direct	F1, F3
transaction	AAMI	Restricted Stock Units	Options Exercise	$0	-5,180	-23%	$0.000000	17,246	15 Feb 2026	Common Stock	5,180	$0.000000	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents the right to receive one share of common stock of Acadian Asset Management Inc.
F2	On February 13, 2026, the reporting person was granted 5,407 restricted stock units, vesting in equal annual installments over a three-year period with 1/3 of the shares vesting on each of February 13, 2027, February 13, 2028 and February 13, 2029.
F3	On February 14, 2025, the reporting person was granted 12,018 restricted stock units, vesting in equal annual installments over a three-year period with 1/3 of the shares vesting on each of February 14, 2026, February 14, 2027 and February 14, 2028.
F4	On February 15, 2023, the reporting person was granted 4,059 restricted stock units, vesting in equal annual installments over a three-year period with 1/3 of the shares vesting on each of February 15, 2024, February 15, 2025 and February 15, 2026. On February 15, 2024, the reporting person was granted 11,481 restricted stock units, vesting in equal annual installments over a three-year period with 1/3 of the shares vesting on each of February 15, 2025, February 15, 2026 and February 15, 2027.