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* Ratcliffe Liam (Last) (First) (Middle) C/O UNUM THERAPEUTICS INC. 200 CAMBRIDGE PARK DRIVE, SUITE 3100 (Street) CAMBRIDGE MA 02410 (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) X Director 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)

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 B Preferred Stock	(1)	(1)	Common Stock	622,772	(1)	I	See Footnote(2)(3)
Series B Preferred Stock	(1)	(1)	Common Stock	622,773	(1)	I	See Footnote(4)(5)

Explanation of Responses:

1. Each share is convertible on a 1.5701314513884-for-1 basis into Common Stock at any time at the election of the Reporting Person and will automatically convert upon the closing of the Issuer's initial public offering into the number of shares of the Issuer's Common Stock shown in column 3 without payment or further consideration.

2. The shares are held directly by New Leaf Biopharma Opportunities I, L.P. ("Biopharma I"). New Leaf BPO Associates I, L.P. ("NLBA I") is the sole general partner of Biopharma I. New Leaf Venture Management III, L.L.C. ("NLV Management III") is the sole general partner of NLBA I. New Leaf Venture Partners, L.L.C. ("NLVP") is the investment adviser of Biopharma I. Each of NLBA I and NLV Management III disclaim beneficial ownership of these securities and this report shall not be deemed an admission that NLBA I or NLV Management III are beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein. Each of the Reporting Person, Ronald M. Hunt and Vijay K. Lathi (each a "Member" and collectively, the "Members") is a member of NLV Management III and may be deemed to have shared voting and dispositive power of these securities. Continued in Footnote 3

3. Continued from Footnote 2: Each of the Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 of any other purpose, except to the extent of their respective pecuniary interests therein.

4. The shares are held directly by New Leaf Ventures III, L.P. ("NLV III").New Leaf Venture Associates III, L.P. ("NLV Associates III") is the sole general partner of NLV III. NLV Management III is the sole general partner of NLV Associates III. NLVP is the investment adviser of NLV III.Each of NLV Associates and NLV Management III disclaim beneficial ownership of these securities and this report shall not be deemed an admission that NLBA I or NLV Management III are beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein. Each of the Members may be deemed to have shared voting and dispositive power of these securities. Continued in Footnote 5

5. Continued from Footnote 4: Each of the Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 of any other purpose, except to the extent of their respective pecuniary interests therein.

Remarks:

Exhibit 24 - Power of Attorney (attached)

	/s/ Amoli Pandya, Attorney-in-Fact	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).
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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 12, 2018.

/s/ Liam Ratcliffe
LIAM RATCLIFFE