X0202 13F-HR LIVE 0001703031 XXXXXXXX 12-31-2025 12-31-2025 false Bain Capital Life Sciences Investors, LLC

200 Clarendon Street Boston MA 02116

13F HOLDINGS REPORT 028-18477 Y Bain Capital Life Sciences Investors, LLC ("BCLSI") is (i) the manager of Bain Capital Life Sciences Investors II, LLC, which is the general partner of Bain Capital Life Sciences Fund II, L.P., which is the manager of BCLS II Investco (GP), LLC, which is the general partner of BCLS II Investco, LP, (ii) the manager of Bain Capital Life Sciences III General Partner, LLC, which is the general partner of Bain Capital Life Sciences Fund III, L.P., which is the (a) sole member of Bain Capital Life Sciences Opportunities III GP, LLC, which is the general partner of Bain Capital Life Sciences Opportunities III, LP and (b) the managing member of BCLS Fund III Investments GP, LLC, which is the general partner of BCLS Fund III Investments, LP. and (iii) the manager of Bain Capital Life Sciences IV General Partner, LLC, which is the general partner of Bain Capital Life Sciences Fund IV, L.P., which is the sole member of Bain Capital Life Sciences Opportunities IV GP, LLC, which is the general partner of Bain Capital Life Sciences Opportunities IV, L.P. The information included on the Information Table with respect to the holdings of Annexon Inc. ("ANNX"), C4 Therapeutics, Inc. ("CCCC"), Cabaletta Bio, Inc. ("CABA"), NewAmsterdam Pharma Company NV ("NAMS"), Olema Pharmaceuticals, Inc. ("OLMA"), Savara Inc. ("SVRA"), Solid Biosciences Inc. ("SLDB"), X4 Pharmaceuticals, Inc. ("XFOR") and Xilio Therapeutics, Inc. ("XLO") reflect the exercise or conversion of warrants or other convertible securities held by affiliates of BCLSI after giving effect to provisions that prevent the exercise of such securities if the beneficial ownership of such persons would exceed 9.99% of the underlying security following such exercise. As of December 31, 2025, affiliates of BCLSI held an aggregate of 4,474,126 shares of ANNX common stock, 3,131,910 shares of CCCC common stock, 4,260,888 shares of CABA common stock, 5,673,913 ordinary shares of NAMS, 1,989,775 shares of OLMA common stock, 14,789,777 shares of SVRA common stock, 4,505,922 shares of SLDB common stock, 615,649 shares of XFOR common stock and 1,112,944 shares of XLO common stock. Adam Koppel 617-516-2000 /s/ Adam Koppel Boston MA 02-17-2026 14 19 1305660829 false 1 28-20816 Bain Capital Life Sciences Investors II, LLC 2 28-20814 Bain Capital Life Sciences Fund II, L.P. 3 28-22976 BCLS II Investco (GP), LLC 4 28-22978 BCLS II Investco, LP 5 28-22975 Bain Capital Life Sciences III General Partner, LLC 6 28-22979 Bain Capital Life Sciences Fund III, L.P. 7 28-22968 Bain Capital Life Sciences Opportunities III GP, LLC 8 28-22966 Bain Capital Life Sciences Opportunities III, LP 9 28-25138 BCLS Fund III Investments GP, LLC 10 28-25140 BCLS Fund III Investments, LP 11 Bain Capital Life Sciences IV General Partner, LLC 12 Bain Capital Life Sciences Fund IV, L.P. 13 Bain Capital Life Sciences Opportunities IV GP, LLC 14 Bain Capital Life Sciences Opportunities IV, L.P.