Phillip B. Donenberg - 13 Feb 2026 Form 4 Insider Report for Sensei Biotherapeutics, Inc. (SNSE)

Role: Director
Signature: /s/ Phillip B. Donenberg
Issuer symbol: SNSE
Transactions as of: 13 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 17 Feb 2026, 17:01:24 UTC
Previous filing: 11 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Donenberg Phillip B.	Director	C/O SENSEI BIOTHERAPEUTICS, INC., 1405 RESEARCH BLVD, SUITE 125, ROCKVILLE	/s/ Phillip B. Donenberg	17 Feb 2026	0001238120

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	SNSE	Stock Option (right to buy)	Award	$0	+1,900		$0.000000	1,900	13 Feb 2026	Common Stock	1,900	$9.09	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The shares subject to the option vest and become exercisable in 36 equal monthly installments over a three year period such that the option is fully vested on the third anniversary of the date of grant, or February 13, 2029, subject to the Reporting Person's continuous service with the Issuer as of each such vesting date.