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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*
Ettenberg Seth
(Last) (First) (Middle)
C/O UNUM THERAPEUTICS INC.
200 CAMBRIDGE PARK DRIVE, SUITE 3100
(Street)
CAMBRIDGE MA 02140
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
03/28/2018 		3. Issuer Name and Ticker or Trading Symbol
Unum Therapeutics, Inc. [ UMRX ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Scientific Officer
 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)
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
Stock Option (Right to Buy) (1) 01/28/2025 Common Stock 398,055 0.18 D
Stock Option (Right to Buy) (2) 04/29/2025 Common Stock 153,255 0.18 D
Stock Option (Right to Buy) (3) 10/26/2027 Common Stock 79,611 9.77 D
Stock Option (Right to Buy) (4) 03/16/2028 Common Stock 80,566 12 D
Explanation of Responses:
1. 25% of the shares vests on September 3, 2015, and the remaining shares shall vest in 36 equal monthly installments thereafter, subject to the Reporting Persons continuous service with the Issuer.
2. 25% of the shares vests on April 30, 2016, and the remaining shares shall vest in 36 equal monthly installments thereafter, subject to the Reporting Persons continuous service with the Issuer.
3. 25% of the shares vests on October 27, 2018, and the remaining shall shares vest in 36 equal monthly installments thereafter, subject to the Reporting Persons continuous service with the Issuer.
4. 25% of the shares vest on March 28, 2019, and the remaining shares shall vest in 36 equal monthly installments thereafter, subject to the Reporting Persons continuous service with the Issuer.
Remarks:
Exhibit 24 - Power of Attorney (attached)
/s/ Seth Ettenberg 03/28/2018
** 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.
LIMITED POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Christiana Stamoulis,
Charles Wilson, Caitlin L. Murray and Amoli Pandya, signing singly, and with
full power of substitution, the undersigned's true and lawful attorney-in-fact
to:

	(1)	execute for and on behalf of the undersigned, in the undersigned's capacity
as officer and/or director of Unum Therapeutics Inc. (the "Company"), from time
to time the following U.S. Securities and Exchange Commission ("SEC") forms: (i)
Form ID, including any attached documents (such as Update Passphrase
Authentication), to effect the assignment of codes to the undersigned to be used
in the transmission of information to the SEC using the EDGAR System; (ii) Form
3, Initial Statement of Beneficial Ownership of Securities, including any
attached documents; (iii) Form 4, Statement of Changes in Beneficial Ownership
of Securities, including any attached documents; (iv) Form 5, Annual Statement
of Beneficial Ownership of Securities in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended, and the rules thereunder, including
any attached documents; (v) Schedule 13D and (vi) amendments of each thereof, in
accordance with the Securities Exchange Act of 1934, as amended, and the rules
thereunder, including any attached documents;

	(2)	do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such Form 3, 4 or 5,
Schedule 13D or any amendment(s) thereto, and timely file such form(s) with the
SEC and any securities exchange, national association or similar authority; and

	(3)	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, acting singly,
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 is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 or Regulation 13D-G of
the Securities Exchange Act of 1934, as amended.  The undersigned hereby agrees
to indemnify the attorneys-in-fact and the Company from and against any demand,
damage, loss, cost or expense arising from any false or misleading information
provided by the undersigned to the attorneys-in-fact.

	This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file such forms 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 attorneys-in-fact.  This Power of Attorney supersedes any prior power
of attorney in connection with the undersigned's capacity as an officer and/or
director of the Company.  This Power of Attorney shall expire as to any
individual attorney-in-fact if such attorney-in-fact ceases to be an executive
officer of, or legal counsel to, the Company.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of March 11, 2018.

/s/ Seth Ettenberg
SETH ETTENBERG