Form 13F-HR Bain Capital Life Scienc For: Mar 31

May 17, 2021 7:00 AM EDT

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The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL
OMB Number: 3235-0006
Expires: July 31, 2015
Estimated average burden
hours per response: 23.8

Report for the Calendar Year or Quarter Ended: 03-31-2021
Check here if Amendment   Amendment Number:
This Amendment (Check only one.):   is a restatement.
  adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: Bain Capital Life Sciences Investors, LLC
Address: 200 Clarendon Street
Boston , MA02116
Form 13F File Number: 028-18477

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name: Adam Koppel
Title: Managing Dir. of Bain Capital Life Sciences Investors, LLC
Phone: 617-516-2000
Signature, Place, and Date of Signing:
/s/ Adam Koppel Boston , MA 05-17-2021
[Signature] [City, State] [Date]
Report Type (Check only one.):
X 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
  13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
  13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
Form 13F Summary Page
Report Summary:
Number of Other Included Managers: 5
Form 13F Information Table Entry Total: 31
Form 13F Information Table Value Total: 1,765,308
(thousands)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
Form 13F File Number Name
28-18476 Bain Capital Life Sciences Partners, LP
28-18478 Bain Capital Life Sciences Fund, L.P.
28-20270 BC SW, LP
28-20816 Bain Capital Life Sciences Investors II, LLC
28-20814 Bain Capital Life Sciences Fund II, L.P.

List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]
No. Form 13F File Number Name
1 28-18476 Bain Capital Life Sciences Partners, LP
2 28-18478 Bain Capital Life Sciences Fund, L.P.
3 28-20270 BC SW, LP
4 28-20816 Bain Capital Life Sciences Investors II, LLC
5 28-20814 Bain Capital Life Sciences Fund II, L.P.

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE

OMB APPROVAL
OMB Number: 3235-0006
Expires: July 31, 2015
Estimated average burden
hours per response: 23.8

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
DICERNA PHARMACEUTICALS INC COM 253031108 78,762 3,080,237 SH SOLE 3,080,237 0 0
MARINUS PHARMACEUTICALS INC COM 56854Q200 22,153 1,431,058 SH SOLE 1,431,058 0 0
SOLID BIOSCIENCES INC COM 83422E105 43,852 7,929,918 SH SOLE 7,929,918 0 0
APTINYX INC COM 03836N103 26,675 8,891,758 SH SOLE 8,891,758 0 0
SPRINGWORKS THERAPEUTICS INC COM 85205L107 429,009 5,831,307 SH SOLE 5,831,307 0 0
DYNAVAX TECHNOLOGIES CORP COM 268158201 107,105 10,895,773 SH SOLE 10,895,773 0 0
CONSTELLATION PHARMACEUTICALS, INC. COM 210373106 32,746 1,400,000 SH SOLE 1,400,000 0 0
X4 PHARMACEUTICALS INC COM 98420X103 18,249 2,119,540 SH SOLE 2,119,540 0 0
SAVARA INC COM 805111101 24,175 11,622,598 SH SOLE 11,622,598 0 0
ARCUTIS BIOTHERAPEUTICS, INC. COM 03969K108 115,121 3,979,292 SH SOLE 3,979,292 0 0
MERSANA THERAPEUTICS INC COM 59045L106 59,796 3,695,667 SH SOLE 3,695,667 0 0
CRINETICS PHARMACEUTICALS INC COM 22663K107 16,371 1,071,428 SH SOLE 1,071,428 0 0
AEGLEA BIOTHERAPEUTICS INC COM 00773J103 21,384 2,700,000 SH SOLE 2,700,000 0 0
ANNEXON INC COM 03589W102 90,247 3,241,628 SH SOLE 3,241,628 0 0
NURIX THERAPEUTICS, INC. COM 67080M103 39,929 1,284,314 SH SOLE 1,284,314 0 0
KYMERA THERAPEUTICS INC. COM 501575104 18,637 479,605 SH SOLE 479,605 0 0
THERAPEUTICS ACQUISITION CORP COM CL A 88339T103 10,510 1,000,000 SH SOLE 1,000,000 0 0
ARYA SCIENCES ACQUISITION CORP III COM CL A G3166W106 13,780 1,000,000 SH SOLE 1,000,000 0 0
BCTG ACQUISITION CORP COM 05492W103 5,560 500,000 SH SOLE 500,000 0 0
SYROS PHARMACEUTICALS, INC. COM 87184Q107 43,272 5,785,036 SH SOLE 5,785,036 0 0
ATEA PHARMACEUTICALS, INC. COM 04683R106 346,767 5,615,659 SH SOLE 5,615,659 0 0
C4 THERAPEUTICS, INC. COM STK 12529R107 60,745 1,642,209 SH SOLE 1,642,209 0 0
BCLS ACQUISITION CORP COM CL A G0904B105 5,153 487,500 SH SOLE 487,500 0 0
JIYA ACQUISITION CORP COM CL A 47760M102 2,952 300,000 SH SOLE 300,000 0 0
HELIX ACQUISITION CORP COM CL A G4444C102 2,550 250,000 SH SOLE 250,000 0 0
FRAZIER LIFESCIENCES ACQUISITION CORP UNIT 12/09/2025 G3710A121 3,048 300,000 SH SOLE 300,000 0 0
PHARVARIS N.V. COM N69605108 88,993 3,180,601 SH SOLE 3,180,601 0 0
ARYA SCIENCES ACQUISITION CORP IV CL A G31659108 7,331 700,000 SH SOLE 700,000 0 0
BLUEBIRD BIO, INC. COM 09609G100 16,226 538,179 SH SOLE 538,179 0 0
OMEGA ALPHA SPAC CL A G6749V107 3,960 400,000 SH SOLE 400,000 0 0
RESEARCH ALLIANCE CORP II COM CL A 760873109 10,250 1,000,000 SH SOLE 1,000,000 0 0


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