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EcoR1 Capital, LLC

Q1 2026 · Filed 2026-05-15
Market Value
$1.8B
+10.9%
Holdings
35
-2
New Purchases
9
Added To
4
Closed
9
Reduced
3
Top 10 Concentration
89.4%
Turnover
51.4%

Top Buys (by % of Portfolio)

SymbolCur %Prior %Chg %Value
CNTA 13.58% 4.93% +8.66% $238M
AKTS 4.92% 0.00% +4.92% $86M
CGON 4.25% 2.03% +2.22% $75M
ORIC 4.86% 3.48% +1.38% $85M
RLAY 1.08% 0.00% +1.08% $19M
ETON 3.05% 2.17% +0.88% $54M
ERAS 0.83% 0.00% +0.83% $15M
ANAB 24.90% 24.15% +0.75% $437M
EIKN 0.44% 0.00% +0.44% $8M
REPL 0.44% 0.00% +0.44% $8M
PHAT 0.40% 0.00% +0.40% $7M
STOK 0.19% 0.00% +0.19% $3M
PRLD 0.18% 0.00% +0.18% $3M
HLXC 0.12% 0.00% +0.12% $2M
MREO 0.25% 0.21% +0.04% $4M

Top Sells (by % of Portfolio)

SymbolCur %Prior %Chg %Value
IMNM 0.00% 3.88% -3.88% $0
CRNX 8.88% 12.62% -3.74% $156M
MBX 1.32% 4.23% -2.91% $23M
XNCR 1.50% 3.15% -1.65% $26M
GPCR 0.00% 1.47% -1.47% $0
PCVX 0.00% 1.31% -1.31% $0
AQST 0.00% 1.07% -1.07% $0
VYGR 0.00% 0.99% -0.99% $0
ZBIO 0.88% 1.81% -0.93% $15M
CRSP 3.77% 4.61% -0.84% $66M
BBOT 1.44% 2.23% -0.79% $25M
0HIY.L 0.03% 0.66% -0.63% $471K
LKFT 2.85% 3.45% -0.60% $50M
MNKD 0.00% 0.60% -0.60% $0
NUVB-WT 0.00% 0.55% -0.55% $0

Sector Allocation Over Time

Market Cap Concentration

TierHoldingsValueWeight
Large Cap 1 $323M 18.4%
Mid Cap 10 $1.0B 57.3%
Small Cap 15 $409M 23.3%
Micro Cap 9 $18M 1.0%

Portfolio Analytics

Avg Market Cap
$2.0B
Median Market Cap
$893M
Avg P/E
Median P/E
Avg Dividend Yield
—%
Avg Beta
0.75
# Stocks
35
# ETFs / Funds
0

Top Holdings (35 total)

# Symbol % Port Shares Value Avg Price Q/Q Value Chg Share Chg Chg % Status
1 ANAB 24.90% 7,880,094 $437M $55.46 $55M
2 JAZZ 18.38% 1,706,469 $323M $189.05 $33M
3 CNTA 13.58% 6,000,000 $238M $39.72 $160M +2,885,000 +92.6%
4 CRNX 8.88% 4,288,120 $156M $36.32 -$44M
5 AKTS 4.92% 4,824,469 $86M $17.89 +4,824,469 NEW
6 ORIC 4.86% 6,728,116 $85M $12.67 $30M
7 CGON 4.25% 1,102,000 $75M $67.68 $43M +330,000 +42.8%
8 CRSP 3.77% 1,389,276 $66M $47.57 -$7M
9 ETON 3.05% 2,171,938 $54M $24.68 $19M +141,394 +7.0%
10 LKFT 2.85% 1,667,119 $50M $30.00 -$5M
11 XNCR 1.50% 2,183,000 $26M $12.06 -$23M -1,068,112 -32.9%
12 NGNE 1.46% 1,271,342 $26M $20.16 -$559K
13 BBOT 1.44% 2,823,126 $25M $8.95 -$10M
14 MBX 1.32% 777,000 $23M $29.85 -$44M -1,346,604 -63.4%
15 RLAY 1.08% 1,904,762 $19M $9.95 +1,904,762 NEW
16 ZBIO 0.88% 789,500 $15M $19.55 -$13M
17 ERAS 0.83% 900,000 $15M $16.18 +900,000 NEW
18 EIKN 0.44% 732,606 $8M $10.58 +732,606 NEW
19 REPL 0.44% 1,000,000 $8M $7.65 +1,000,000 NEW
20 PHAT 0.40% 625,000 $7M $11.11 +625,000 NEW
21 MREO 0.25% 13,368,855 $4M $0.33 $1M +5,512,389 +70.2%
22 STOK 0.19% 100,000 $3M $32.56 +100,000 NEW
23 PRLD 0.18% 947,049 $3M $3.42 +947,049 NEW
24 HLXC 0.12% 200,000 $2M $10.16 +200,000 NEW
25 0HIY.L 0.03% 99,593 $471K $4.73 -$10M -473,590 -82.6%
26 SRZNW 0.01% 4,444 $129K $29.13 $29K
27 EOLS —% -$4M -675,000 -100.0% SOLD
28 CAMP —% -$2M -325,000 -100.0% SOLD
29 IMNM —% -$61M -2,855,590 -100.0% SOLD
30 PCVX —% -$21M -450,000 -100.0% SOLD
31 GPCR —% -$23M -334,380 -100.0% SOLD
32 AQST —% -$17M -2,625,000 -100.0% SOLD
33 VYGR —% -$16M -4,002,847 -100.0% SOLD
34 MNKD —% -$9M -1,660,000 -100.0% SOLD
35 NUVB-WT —% -$9M -963,333 -100.0% SOLD

New Positions

SymbolValue% Port
AKTS $86M 4.92%
RLAY $19M 1.08%
ERAS $15M 0.83%
EIKN $8M 0.44%
REPL $8M 0.44%
PHAT $7M 0.40%
STOK $3M 0.19%
PRLD $3M 0.18%
HLXC $2M 0.12%

Sold Out Positions

SymbolValue% Port
EOLS —%
AQST —%
IMNM —%
GPCR —%
MNKD —%
PCVX —%
CAMP —%
VYGR —%
NUVB-WT —%
View SEC EDGAR Filings for EcoR1 Capital, LLC →

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For informational purposes only. Not investment advice. Data sourced from SEC filings. Privacy Terms