Bain Capital Life Sciences Investors, LLC Long-Term Concentrated

Name: Bain Capital Life Sciences Investors, LLC Q4 2025 13F Filing | 13F Explorer
Creator: Bain Capital Life Sciences Investors, LLC
Published: 2026-02-17

Location: Boston, MA

CIK: 0001703031 · Show all filings

Period: Q4 2025 (← Previous) (Next →)

Filing Date: Feb 17, 2026

Total Value: $1.306B (100.0% shares, 0.0% debt)

Holdings (19)

HTFL HEARTFLOW INC 27.8%

Value $363M Shares 12,448,158 Est. Cost $32.24 Unrealized -0.1%

NAMS NEWAMSTERDAM PHARMA COMPANY 19.6%

Value $256M Shares 7,306,566 Est. Cost $10.88 Unrealized +234.4%

OLMA OLEMA PHARMACEUTICALS INC 16.3%

Value $213M Shares 8,508,641 Est. Cost $11.52 Unrealized +54.5%

SVRA SAVARA INC 8.1%

Value $106M Shares 17,600,621 Est. Cost $2.08 Unrealized +135.7%

PHVS PHARVARIS N V 6.0%

Value $77.76M Shares 2,802,081 Est. Cost $23.89 Unrealized +0.8%

SLDB SOLID BIOSCIENCES INC 3.4%

Value $44.62M Shares 7,911,669 Est. Cost $5.76 Unrealized -5.9%

UPB UPSTREAM BIO INC 2.8%

Value $36.1M Shares 1,329,544 Est. Cost $21.55 Unrealized +15.5%

XFOR X4 PHARMACEUTICALS INC 2.4%

Value $31.87M Shares 7,967,454 Est. Cost $3.42 Unrealized +6.3%

DNTH DIANTHUS THERAPEUTICS INC 2.3%

Value $30.64M Shares 743,592 Est. Cost $21.73 Unrealized +78.4%

KYTX KYVERNA THERAPEUTICS INC 2.2%

Value $29.23M Shares 3,110,000 Est. Cost $27.08 Unrealized -72.6%

ANNX ANNEXON INC 2.0%

Value $26.35M Shares 5,249,069 Est. Cost $11.24 Unrealized -66.0%

RPID RAPID MICRO BIOSYSTEMS INC 1.9%

Value $24.46M Shares 8,434,560 Est. Cost $20.66 Unrealized -83.2%

CABA CABALETTA BIO INC 1.6%

Value $21.19M Shares 9,677,125 Est. Cost $3.63 Unrealized -31.8%

CCCC C4 THERAPEUTICS INC 1.0%

Value $13.7M Shares 7,171,910 Est. Cost $6.50 Unrealized -63.5%

— MERSANA THERAPEUTICS INC 0.8%

Value $10.03M Shares 346,545 Est. Cost $7.76 Unrealized —

AVIR ATEA PHARMACEUTICALS INC 0.7%

Value $8.874M Shares 2,485,638 Est. Cost $32.23 Unrealized -90.1%

TNGX TANGO THERAPEUTICS INC 0.4%

Value $5.79M Shares 653,493 Est. Cost $10.01 Unrealized -13.9%

XLO XILIO THERAPEUTICS INC 0.4%

Value $4.72M Shares 7,372,686 Est. Cost $7.01 Unrealized -89.3%

NAMSW NEWAMSTERDAM PHARMA COMPANY 0.2%

Value $2.3M Shares 99,999 Est. Cost $0.86 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
HTFL	HEARTFLOW INC	12,448,158	$363M	27.8%	$32.24	-0.1%	COM	42238D107
NAMS	NEWAMSTERDAM PHARMA COMPANY	7,306,566	$256M	19.6%	$10.88	+234.4%	ORDINARY SHARES	N62509109
OLMA	OLEMA PHARMACEUTICALS INC	8,508,641	$213M	16.3%	$11.52	+54.5%	COM	68062P106
SVRA	SAVARA INC	17,600,621	$106M	8.1%	$2.08	+135.7%	COM	805111101
PHVS	PHARVARIS N V	2,802,081	$77.76M	6.0%	$23.89	+0.8%	COM	N69605108
SLDB	SOLID BIOSCIENCES INC	7,911,669	$44.62M	3.4%	$5.76	-5.9%	COM NEW	83422E204
UPB	UPSTREAM BIO INC	1,329,544	$36.1M	2.8%	$21.55	+15.5%	COM	91678A107
XFOR	X4 PHARMACEUTICALS INC	7,967,454	$31.87M	2.4%	$3.42	+6.3%	COM NEW	98420X202
DNTH	DIANTHUS THERAPEUTICS INC	743,592	$30.64M	2.3%	$21.73	+78.4%	COM	252828108
KYTX	KYVERNA THERAPEUTICS INC	3,110,000	$29.23M	2.2%	$27.08	-72.6%	COM	501976104
ANNX	ANNEXON INC	5,249,069	$26.35M	2.0%	$11.24	-66.0%	COM	03589W102
RPID	RAPID MICRO BIOSYSTEMS INC	8,434,560	$24.46M	1.9%	$20.66	-83.2%	CLASS A COM	75340L104
CABA	CABALETTA BIO INC	9,677,125	$21.19M	1.6%	$3.63	-31.8%	COM	12674W109
CCCC	C4 THERAPEUTICS INC	7,171,910	$13.7M	1.0%	$6.50	-63.5%	COM STK	12529R107
—	MERSANA THERAPEUTICS INC	346,545	$10.03M	0.8%	$7.76	—	COM	59045L205
AVIR	ATEA PHARMACEUTICALS INC	2,485,638	$8.874M	0.7%	$32.23	-90.1%	COM	04683R106
TNGX	TANGO THERAPEUTICS INC	653,493	$5.79M	0.4%	$10.01	-13.9%	COM	87583X109
XLO	XILIO THERAPEUTICS INC	7,372,686	$4.72M	0.4%	$7.01	-89.3%	COM	98422T100
NAMSW	NEWAMSTERDAM PHARMA COMPANY	99,999	$2.3M	0.2%	$0.86	—	*W EXP 99/99/999	N62509117