Filed: 8/14/2026ACC: 0001193125-26-350470
📋 What this filing means
BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC filed this quarterly 13F‑HR report disclosing 21 equity positions with a total reported market value of $1.68B. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
21
Positions
$1.68B
Total AUM (reported)
127.68M
Total Shares
Allocation by class
COM$707.95M42.1%
COMMON STOCK$497.51M29.6%
COM NEW$135.20M8.0%
ORDINARY SHARES$129.00M7.7%
SHS$101.54M6.0%
COM SHS$60.60M3.6%
COM STK$33.49M2.0%
Portfolio Concentration
Top 3$874.38M52.0%
4–10$603.33M35.9%
11–25$204.31M12.1%
Top 3 weight
52.0%
Top 10 weight
87.9%
Voting Authority Distribution
Total shares with voting rights: 127.68M
Sole
Full voting authority
127.68M
shares
% of voting shares100.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
0.00
shares
% of voting shares0.0%
Investment Discretion (by position count)
Sole21
Shared0
Other0
Dominant voting typeSole · 100.0% of voting shares
Institutional Holdings21
Rows:
KAILERA THERAPEUTICS INC
SOLEShares22.58M
TypeSH
Market value$497.51M
29.58%
Sole
22.58M
Shared
0.00
None
0.00
HEARTFLOW INC
SOLEShares8.45M
TypeSH
Market value$247.87M
14.74%
Sole
8.45M
Shared
0.00
None
0.00
NEWAMSTERDAM PHARMA COMPANY
SOLEShares3.81M
TypeSH
Market value$129.00M
7.67%
Sole
3.81M
Shared
0.00
None
0.00
SAVARA INC
SOLEShares17.60M
TypeSH
Market value$108.42M
6.45%
Sole
17.60M
Shared
0.00
None
0.00
ALKERMES PLC
SOLEShares1.94M
TypeSH
Market value$101.54M
6.04%
Sole
1.94M
Shared
0.00
None
0.00
SOLID BIOSCIENCES INC
SOLEShares9.81M
TypeSH
Market value$97.99M
5.83%
Sole
9.81M
Shared
0.00
None
0.00
PHARVARIS N V
SOLEShares2.68M
TypeSH
Market value$92.52M
5.50%
Sole
2.68M
Shared
0.00
None
0.00
OLEMA PHARMACEUTICALS INC
SOLEShares7.09M
TypeSH
Market value$88.64M
5.27%
Sole
7.09M
Shared
0.00
None
0.00
HEMAB THERAPEUTICS HOLDINGS INC
SOLEShares1.65M
TypeSH
Market value$60.60M
3.60%
Sole
1.65M
Shared
0.00
None
0.00
CABALETTA BIO INC
SOLEShares17.24M
TypeSH
Market value$53.62M
3.19%
Sole
17.24M
Shared
0.00
None
0.00
X4 PHARMACEUTICALS INC
SOLEShares7.97M
TypeSH
Market value$37.21M
2.21%
Sole
7.97M
Shared
0.00
None
0.00
DIANTHUS THERAPEUTICS INC
SOLEShares362.47K
TypeSH
Market value$35.33M
2.10%
Sole
362.47K
Shared
0.00
None
0.00
C4 THERAPEUTICS INC
SOLEShares7.17M
TypeSH
Market value$33.49M
1.99%
Sole
7.17M
Shared
0.00
None
0.00
KYVERNA THERAPEUTICS INC
SOLEShares2.88M
TypeSH
Market value$25.71M
1.53%
Sole
2.88M
Shared
0.00
None
0.00
ANNEXON INC
SOLEShares4.44M
TypeSH
Market value$25.34M
1.51%
Sole
4.44M
Shared
0.00
None
0.00
RAPID MICRO BIOSYSTEMS INC
SOLEShares8.43M
TypeSH
Market value$14.59M
0.87%
Sole
8.43M
Shared
0.00
None
0.00
DISC MEDICINE INC
SOLEShares141.23K
TypeSH
Market value$10.33M
0.61%
Sole
141.23K
Shared
0.00
None
0.00
ATEA PHARMACEUTICALS INC
SOLEShares2.08M
TypeSH
Market value$9.65M
0.57%
Sole
2.08M
Shared
0.00
None
0.00
XILIO THERAPEUTICS INC
SOLEShares664.02K
TypeSH
Market value$6.36M
0.38%
Sole
664.02K
Shared
0.00
None
0.00
UPSTREAM BIO INC
SOLEShares600.95K
TypeSH
Market value$4.16M
0.25%
Sole
600.95K
Shared
0.00
None
0.00
NEWAMSTERDAM PHARMA COMPANY
SOLEShares100K
TypeSH
Market value$2.14M
0.13%
Sole
100K
Shared
0.00
None
0.00
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
KAILERA THERAPEUTICS INCSOLE | COMMON STOCK | 22.58M | SH | $497.51M 29.58% | 22.58M | 0.00 | 0.00 |
HEARTFLOW INCSOLE | COM | 8.45M | SH | $247.87M 14.74% | 8.45M | 0.00 | 0.00 |
NEWAMSTERDAM PHARMA COMPANYSOLE | ORDINARY SHARES | 3.81M | SH | $129.00M 7.67% | 3.81M | 0.00 | 0.00 |
SAVARA INCSOLE | COM | 17.60M | SH | $108.42M 6.45% | 17.60M | 0.00 | 0.00 |
ALKERMES PLCSOLE | SHS | 1.94M | SH | $101.54M 6.04% | 1.94M | 0.00 | 0.00 |
SOLID BIOSCIENCES INCSOLE | COM NEW | 9.81M | SH | $97.99M 5.83% | 9.81M | 0.00 | 0.00 |
PHARVARIS N VSOLE | COM | 2.68M | SH | $92.52M 5.50% | 2.68M | 0.00 | 0.00 |
OLEMA PHARMACEUTICALS INCSOLE | COM | 7.09M | SH | $88.64M 5.27% | 7.09M | 0.00 | 0.00 |
HEMAB THERAPEUTICS HOLDINGS INCSOLE | COM SHS | 1.65M | SH | $60.60M 3.60% | 1.65M | 0.00 | 0.00 |
CABALETTA BIO INCSOLE | COM | 17.24M | SH | $53.62M 3.19% | 17.24M | 0.00 | 0.00 |
X4 PHARMACEUTICALS INCSOLE | COM NEW | 7.97M | SH | $37.21M 2.21% | 7.97M | 0.00 | 0.00 |
DIANTHUS THERAPEUTICS INCSOLE | COM | 362.47K | SH | $35.33M 2.10% | 362.47K | 0.00 | 0.00 |
C4 THERAPEUTICS INCSOLE | COM STK | 7.17M | SH | $33.49M 1.99% | 7.17M | 0.00 | 0.00 |
KYVERNA THERAPEUTICS INCSOLE | COM | 2.88M | SH | $25.71M 1.53% | 2.88M | 0.00 | 0.00 |
ANNEXON INCSOLE | COM | 4.44M | SH | $25.34M 1.51% | 4.44M | 0.00 | 0.00 |
RAPID MICRO BIOSYSTEMS INCSOLE | CLASS A COM | 8.43M | SH | $14.59M 0.87% | 8.43M | 0.00 | 0.00 |
DISC MEDICINE INCSOLE | COM | 141.23K | SH | $10.33M 0.61% | 141.23K | 0.00 | 0.00 |
ATEA PHARMACEUTICALS INCSOLE | COM | 2.08M | SH | $9.65M 0.57% | 2.08M | 0.00 | 0.00 |
XILIO THERAPEUTICS INCSOLE | COM | 664.02K | SH | $6.36M 0.38% | 664.02K | 0.00 | 0.00 |
UPSTREAM BIO INCSOLE | COM | 600.95K | SH | $4.16M 0.25% | 600.95K | 0.00 | 0.00 |
NEWAMSTERDAM PHARMA COMPANYSOLE | *W EXP 99/99/999 | 100K | SH | $2.14M 0.13% | 100K | 0.00 | 0.00 |