John Costigan - 01 Nov 2025 Form 4 Insider Report for FACTSET RESEARCH SYSTEMS INC (FDS)

Role: Chief Data Officer
Signature: /s/ WINNIFRED LEWIS, Attorney in Fact for John Costigan
Issuer symbol: FDS
Transactions as of: 01 Nov 2025
Net transactions value: -$32,550
Form type: 4
Filing time: 03 Nov 2025, 18:37:51 UTC
Previous filing: 17 Sep 2025
Next filing: 05 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Costigan John	Chief Data Officer	FACTSET RESEARCH SYSTEMS INC., 45 GLOVER AVENUE, NORWALK	/s/ WINNIFRED LEWIS, Attorney in Fact for John Costigan	03 Nov 2025	0001927003

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FDS	Common Stock	Options Exercise	$0	+367	+115%	$0.000000	686	01 Nov 2025	Direct	F1
transaction	FDS	Common Stock	Tax liability	$32,550	-122	-18%	$266.80	564	01 Nov 2025	Direct	F2

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	FDS	Performance Share Unit	Options Exercise	$0	-367	-100%	$0.000000	0	01 Nov 2025	Common Stock	367		Direct	F3

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

Explanation of Responses:

Id	Content
F1	Represents common stock received upon the vesting on November 1, 2025 of performance share units ("PSUs") granted on November 1, 2022.
F2	Represents the number of shares withheld to cover the cost of taxes upon vesting on November 1, 2025 of PSUs granted on November 1, 2022.
F3	Reflects vesting on November 1, 2025 of PSUs granted on November 1, 2022.