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144: Filer Information

144: Issuer Information

144: Securities Information



Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.



Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

144: Remarks and Signature

Documents 

LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS
Know all by these present, that the undersigned hereby makes,
constitutes and appoints each of Kim C. Drapkin, Jacquelyn Fahey
Sandell, Elizabeth Shortsleeve and Caroline Gammill, signing singly
and each acting individually, as the undersigned s true and lawful
attorney in fact with full power and authority as hereinafter described
to:
(i) execute for and on behalf of the undersigned, in the undersigned's
 capacity as a director, officer and or stockholder  of
Jounce Therapeutics, Inc. (the Company), Forms 3, 4, and 5
(including any amendments thereto) in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder
 (the Exchange Act) and/or Forms 144 (including any amendments thereto)
 in accordance with Rule 144 (Rule 144)
 under the Securities Act of 1933, as amended (the Securities Act);
(ii) do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to prepare, complete
and execute any such Form 3, 4, or 5 or Form 144, prepare, complete and execute
 any amendment or amendments thereto, and timely deliver and file such form
with the United States Securities and Exchange Commission (the SEC) and
any stock exchange or similar  authority, including without limitation the
execution and filing of a Form ID or any other application materials
to enable the undersigned to gain or maintain access to
the Electronic Data Gathering, Analysis and Retrieval system
 of the SEC;
(iii) seek or obtain, as the undersigned's representative and on
the undersigned's behalf, information regarding transactions in
the Company's securities from any third party, including
brokers, employee benefit plan administrators and trustees, and the
undersigned hereby authorizes any such third party to release
any such information to the herein appointed attorney in fact and
approves and ratifies any such release of information; and
(iv) take any other action of any type whatsoever in connection
with the foregoing  which, in the opinion of such
attorney in fact, may be of benefit to, in the best interest
of, or legally required by, the undersigned,  it being understood
that the documents executed by such 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
such attorney in fact may approve in such 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,
in serving in such capacity at the request of the undersigned, are not assuming
nor relieving, nor is the Company assuming nor relieving, any of the
undersigned s responsibilities to comply with Section 16 of the
Exchange Act or Rule 144 of the Securities Act.
The undersigned acknowledges that neither the Company
nor the foregoing attorneys in fact assume (i) any liability for
the undersigned s responsibility to comply with the requirement
of the Exchange Act,
(ii) any liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the undersigned
for profit disgorgement under Section 16(b) of the Exchange Act.
This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and or Forms 144
with the SEC with respect to the undersigned's holdings of and transactions
 in securities issued by the Company, unless earlier revoked by the undersigned
in a signed writing delivered to the foregoing attonreys in fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 3rd day of January, 2023.
/s/ Elizabeth Trehu
Name: Elizabeth Trehu