Stocks/Funds/CIK 1703031

Bain Capital Life Sciences Investors, LLC

long-term holderconcentrated
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1703031
Assets
$1.11B
+64.0% YoY
Holdings
20
Lifetime alpha vs market
-0.94% annual
Average hold time
3.0 yr
median 2.9 yr

Quarterly history

Cum return +47% vs S&P +52% · α -6% lifetimeAUM $1.1B · peak $1.8BFlow $-47M (-4%)2017-122019-032020-062021-092022-122024-032025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-3.30%
trims when stocks drop
when a holding falls −10%+
Middle response
-3.41%
baseline attrition
Rally response
-12.80%
trims into rallies
when a holding rises +10%+

Top positions · 20

Ticker$ value% portYoYHold time
HTFLHeartflow, Inc. Common S$254M22.9%0.8 yr
$234M21.1%3.5 yr
OLMAOlema Pharmaceuticals, I$111M10.0%+296.5%1.5 yr
SVRASavara Inc.$96M8.7%+97.1%6.5 yr
PHVSPharvaris N.V.$76M6.8%+79.9%5.3 yr
$71M6.4%3.5 yr
XFORX4 Pharmaceuticals, Inc.$33M3.0%-41.7%1.0 yr
DNTHDianthus Therapeutics, I$30M2.7%+362.6%2.3 yr
ANNXAnnexon, Inc.$29M2.6%+187.0%5.8 yr
KYTXKyverna Therapeutics, In$27M2.4%+347.2%2.3 yr
CABACabaletta Bio, Inc.$26M2.3%+93.5%3.0 yr
CNTACentessa Pharmaceuticals$25M2.3%+176.2%0.3 yr
ALKSAlkermes plc$22M1.9%+7.1%0.3 yr
RPIDRapid Micro Biosystems, $19M1.7%-14.0%4.8 yr
CCCCC4 Therapeutics, Inc.$19M1.7%+64.4%5.5 yr

Portfolio composition (YoY)

Industry mix
Biotechnology47.7%-10.6pp$529M
Unknown27.6%-10.8pp$307M
Medical - Healthcare Information Services22.9%$254M
Medical - Devices1.7%-1.6pp$19M
Country
US61.3%+7.4pp
Unknown27.6%-10.8pp
NL6.8%-0.9pp
GB2.3%
IE1.9%
Top 5: 69.6% · Top 10: 86.7% · Top 25: 100.0%

Winners

TickerPrev $PnLYoY %
DNTH$49M+0.18B362.6%
OLMA$26M+0.08B296.5%
SVRA$49M+0.05B97.1%
PHVS$52M+0.04B79.9%
KYTX$7M+0.02B347.2%

Losers

TickerPrev $PnLYoY %
RPID$22M-0.00B-14.0%

Top buys this quarter · 4

+$0M
CNTA Centessa Pharmaceuticals plcnew+$25M
ALKS Alkermes plcnew+$22M
XLO Xilio Therapeutics, Inc.new+$6M

Top sells this quarter · 11

MRSN Mersana Therapeutics, Inc.exit$0M
exit$0M
HTFL Heartflow, Inc. Common Stock$49M
DNTH Dianthus Therapeutics, Inc.$32M
IRON Disc Medicine, Inc.$28M
OLMA Olema Pharmaceuticals, Inc.$15M
TNGX Tango Therapeutics, Inc.exit$14M
UPB Upstream Bio, Inc.$4M
PHVS Pharvaris N.V.$4M
AVIR Atea Pharmaceuticals, Inc.$9M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$1.11B20+67.77%+17.59%+50.17%-0.05B
2025-12-31$1.31B19+47.70%+17.72%+29.98%-0.46B
2025-09-30$1.51B21+4.19%+17.52%-13.33%+0.35B
2025-06-30$799M23-19.20%+14.94%-34.14%+0.04B
2025-03-31$676M24-41.45%+8.30%-49.76%+0.01B
2024-12-31$850M26-17.12%+24.89%-42.01%+0.06B
2024-09-30$961M24+31.19%+36.04%-4.85%-0.06B
2024-06-30$911M25+28.64%+24.49%+4.15%-0.10B
2024-03-31$1.24B26+116.69%+29.62%+87.07%+0.09B
2023-12-31$1.04B27+83.58%+26.18%+57.41%-0.12B
2023-09-30$894M31+42.45%+21.57%+20.88%-0.17B
2023-06-30$971M32+19.54%+19.42%+0.12%-0.12B
2023-03-31$800M34-31.15%-7.82%-23.33%-0.04B
2022-12-31$895M33+1.28%+7.56%-6.28%+0.05B
2022-09-30$838M33-7.66%-4.93%-2.73%+0.05B
2022-06-30$853M35-21.22%-16.11%-5.11%+0.04B