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Filing Details

Accession Number:: 0001209191-19-012245
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2019-02-21 18:05:39
Reporting Period:: 2019-02-19

Accepted Time:: 2019-02-21 18:05:39
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1750019	Tcr2 Therapeutics Inc.	TCRR	Biological Products, (No Disgnostic Substances) (2836)	474152751

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1765022	Mpm Sunstates Fund, L.p.	C/O Mpm Capital 450 Kendall Street Cambridge MA 02142	No	No	Yes	No
1765023	Mpm Sunstates Gp Managing Member Llc	Mpm Capital 450 Kendall Street Cambridge MA 02142	No	No	Yes	No
1765025	Mpm Asset Management Investors Sunstates Fund Llc	C/O Mpm Capital 450 Kendall Street Cambridge MA 02142	No	No	Yes	No
1765026	Mpm Sunstates Fund Gp Llc	C/O Mpm Capital 450 Kendall Street Cambridge MA 02142	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2019-02-19	2,825,396	$0.00	3,021,298	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2019-02-19	322,901	$0.00	3,344,199	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2019-02-19	706,666	$15.00	4,050,865	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	C	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Preferred Stock	Disposition	2019-02-19	17,500,000	$0.00	2,825,396	$0.00
Common Stock	Series B Preferred Stock	Disposition	2019-02-19	2,000,000	$0.00	322,901	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
0			No	4	C	Indirect

Footnotes

All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.
The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.
The shares are held as follows: 2,195,681 by MPM BioVentures 2014, L.P. ("BV 2014"), 146,447 by MPM BioVentures 2014(B), L.P. ("BV 2014(B)"), 79,644 by MPM Asset Management Investors BV2014 LLC ("AM BV2014"), 195,902 by MPM Asset Management LLC ("AM LLC"), 351,155 by MPM SunStates Fund, L.P. ("MPM SunStates") and 52,469 by MPM Asset Management Investors Sunstates Fund LLC ("AM SunStates"). MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). MPM SunStates Fund GP LLC and MPM SunStates GP Managing Member LLC ("SunStates GP") are the direct and indirect general partners of MPM SunStates. Luke Evnin, Ansbert Gadicke and Todd Foley are the managing directors of BV LLC, Ansbert Gadicke is a member of SunStates GP and Luke Evnin and Anbsert Gadicke are the members of AM LLC.
The shares are held as follows: 2,451,844 by BV 2014, 163,532 by BV 2014(B), 88,935 by AM BV2014, 195,902 by AM LLC, 386,270 by MPM SunStates and 57,716 by AM SunStates.
The shares are held as follows: 3,056,272 by BV 2014, 203,846 by BV 2014(B), 110,859 by AM BV2014, 195,902 by AM LLC, 421,070 by MPM SunStates and 62,916 by AM SunStates.
No securities held by the Reporting Persons.