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SEC FORM 3 SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
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1. Name and Address of Reporting Person*
Peyer James
(Last) (First) (Middle)
C/O SENSEI BIOTHERAPEUTICS, INC.
1405 RESEARCH BLVD, SUITE 125
(Street)
ROCKVILLE MD 20850
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
02/03/2021 		3. Issuer Name and Ticker or Trading Symbol
Sensei Biotherapeutics, Inc. [ SNSE ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 2,282,825 I See footnote(1)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Series AA Preferred Convertible Stock (2) (2) Common Stock 110,729,827 (2) I See footnote(1)
Series BB Preferred Convertible Stock (2) (2) Common Stock 4,821,996 (2) I See footnote(1)
Stock Option (Right to Buy) (3) 08/04/2030 Common Stock 19,520 3.22 I See footnote(1)
Explanation of Responses:
1. These shares are held by Cambrian Biopharma, Inc., a Delaware corporation ("Cambrian"). The Reporting Person is the Chief Executive Officer of Cambrian and in such capacity may direct the voting and disposition of the shares held by Cambrian, subject in certain instances to the approval of Cambrian's Board of Directors. Dr. Peyer disclaims beneficial ownership of such shares.
2. Each share of the Series AA Preferred Stock and Series BB Preferred Stock is convertible, at any time, at the holder's election, into 0.0208333 shares of the Issuer's common stock. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series AA Preferred Stock and Series BB Preferred Stock will automatically convert into 0.0208333 shares of the Issuer's common stock. The Series AA Preferred Stock and Series BB Preferred Stock haves no expiration date. Dr. Peyer disclaims beneficial ownership of such shares.
3. The shares subject to the option vest monthly over twenty-four (24) months from the vesting commencement date, March 31, 2020, subject to the continuous service of James Peyer on the Issuer's Board of Directors. Dr. Peyer is the Chief Executive Officer of Cambrian and disclaims beneficial ownership of such shares.
Remarks:
Exhibit 24- Power of Attorney
/s/ Mark Ballantyne, Attorney-in-Fact 02/03/2021
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
                                   POWER OF ATTORNEY
                       (For Executing Form ID and Forms 3, 4 and 5)

	Know all by these presents, that the undersigned hereby constitutes and
appoints each of Michael E. Tenta, Brian F. Leaf, Mark Ballantyne, Emily
Nekimken, April Paredes and Diane James of Cooley LLP, and John Celebi of Sensei
Biotherapeutics, Inc. (the "Company"), the undersigned's true and lawful
attorneys-in-fact and agents to:

	(1)	Prepare, execute in the undersigned's name and on the undersigned's behalf,
and submit to the Securities and Exchange Commission (the "SEC") a Form ID,
Uniform Application for Access Codes to File on EDGAR, including amendments
thereto, and any other documents necessary or appropriate to obtain codes and
passwords enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), or any rule or regulation thereunder;

	(2)	Prepare, execute in the undersigned's name and on the undersigned's behalf,
and submit to the SEC Forms 3, 4 and 5 (including amendments thereto and joint
filing agreements in connection therewith) in accordance with Section 16(a) of
the Exchange Act and the rules thereunder in the undersigned's capacity as an
officer, director or beneficial owner of more than 10% of a registered class of
securities of the Company;

	(3)	Do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to prepare and execute any such Form 3, 4 or 5
(including amendments thereto and joint filing agreements in connection
therewith) and file such forms with the SEC and any stock exchange,
self-regulatory association or any similar authority; and

	(4)	Take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required of the undersigned, it being
understood that the documents executed by the attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as the attorney-in-fact may approve in the
attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney in fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney in fact, or such attorney
in fact's substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein granted.  The
undersigned acknowledges that the foregoing attorneys-in-fact, and their
substitutes, in serving in such capacity at the request of the undersigned, are
not assuming (nor is the Company assuming) any of the undersigned's
responsibilities to comply with Section 16 of the Exchange Act.

	This Power of Attorney shall remain in full force and effect until the earliest
to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5
with respect to the undersigned's holdings of and transactions in securities
issued by the Company, (b) revocation by the undersigned in a signed writing
delivered to the Company and the foregoing attorneys-in fact or (c) as to any
attorney-in-fact individually, until such attorney-in-fact is no longer employed
by the Company or Cooley LLP, as applicable.


IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of the date written below.

Date: 1/12/2021

By:   /s/ James Peyer
Name: James Peyer