Institutional Manager · CIK 0001703031
Bain Capital Life Sciences Investors, LLC
Boston, MA · File #028-18477
Latest AUM
$1.31B
Positions
19
Top-10 Concentration
91.0%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | CIDARA THERAPEUTICS INC | 171757206 | -3,020,990 | -$289.3M | $0 |
| REDUCE | NEWAMSTERDAM PHARMA COMPANY | NAMSW | -3,412,544 | -$119.7M | +$71.2M |
| ADD | OLEMA PHARMACEUTICALS INC | OLMA | +1,664,687 | +$41.6M | +$104.1M |
| REDUCE | UPSTREAM BIO INC | UPB | -1,109,994 | -$30.1M | +$20.3M |
| REDUCE | DIANTHUS THERAPEUTICS INC | DNTH | -572,300 | -$23.6M | +$2.4M |
| ADD | X4 PHARMACEUTICALS INC | XFOR | +5,530,866 | +$22.1M | +$1.4M |
| REDUCE | TANGO THERAPEUTICS INC | TNGX | -2,058,515 | -$18.2M | +$1.2M |
| ADD | C4 THERAPEUTICS INC | CCCC | +6,060,000 | +$11.6M | -$344,692 |
| REDUCE | PHARVARIS N V | PHVS | -379,194 | -$10.5M | +$8.9M |
| REDUCE | KYVERNA THERAPEUTICS INC | KYTX | -258,370 | -$2.4M | +$11.5M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202519 pos · $1.31B
- 13F HOLDINGS REPORTQ/E Sep 202521 pos · $1.51B
- 13F HOLDINGS REPORTQ/E Jun 202523 pos · $799.3M
- 13F HOLDINGS REPORTQ/E Mar 202524 pos · $675.9M
- 13F HOLDINGS REPORTQ/E Dec 202426 pos · $850.1M
- 13F HOLDINGS REPORTQ/E Sep 202424 pos · $961.2M
- 13F HOLDINGS REPORTQ/E Jun 202425 pos · $910.8M
- 13F HOLDINGS REPORTQ/E Mar 202426 pos · $1.24B
- 13F HOLDINGS REPORTQ/E Dec 202331 pos · $894.2M
Top 19 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | HEARTFLOW INC | HTFL | 12,448,158 | $362.9M | 27.79% |
| 2 | NEWAMSTERDAM PHARMA COMPANY | NAMSW | 7,306,566 | $256.3M | 19.63% |
| 3 | OLEMA PHARMACEUTICALS INC | OLMA | 8,508,641 | $212.7M | 16.29% |
| 4 | SAVARA INC | SVRA | 17,600,621 | $106.1M | 8.13% |
| 5 | PHARVARIS N V | PHVS | 2,802,081 | $77.8M | 5.96% |
| 6 | SOLID BIOSCIENCES INC | SLDB | 7,911,669 | $44.6M | 3.42% |
| 7 | UPSTREAM BIO INC | UPB | 1,329,544 | $36.1M | 2.76% |
| 8 | X4 PHARMACEUTICALS INC | XFOR | 7,967,454 | $31.9M | 2.44% |
| 9 | DIANTHUS THERAPEUTICS INC | DNTH | 743,592 | $30.6M | 2.35% |
| 10 | KYVERNA THERAPEUTICS INC | KYTX | 3,110,000 | $29.2M | 2.24% |
| 11 | ANNEXON INC | ANNX | 5,249,069 | $26.4M | 2.02% |
| 12 | RAPID MICRO BIOSYSTEMS INC | RPID | 8,434,560 | $24.5M | 1.87% |
| 13 | CABALETTA BIO INC | CABA | 9,677,125 | $21.2M | 1.62% |
| 14 | C4 THERAPEUTICS INC | CCCC | 7,171,910 | $13.7M | 1.05% |
| 15 | MERSANA THERAPEUTICS INC | 59045L205 | 346,545 | $10.0M | 0.77% |
| 16 | ATEA PHARMACEUTICALS INC | AVIR | 2,485,638 | $8.9M | 0.68% |
| 17 | TANGO THERAPEUTICS INC | TNGX | 653,493 | $5.8M | 0.44% |
| 18 | XILIO THERAPEUTICS INC | XLO | 7,372,686 | $4.7M | 0.36% |
| 19 | NEWAMSTERDAM PHARMA COMPANY | NAMSW | 99,999 | $2.3M | 0.18% |