EcoR1 Capital, LLC

All Holdings — 2025 Q4

Portfolio Concentration Analytics: 7.6
Risk-based ENB:
Total Positions
41
Quarter
2025 Q4
Top Holding
ZYME (27.4%)
Top 10 Concentration
84.6%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
1-25 of 41
Stock History Sector / Type Port % Prev % Rank / Prev Conviction Change % Change Influence Shares Mkt Value Avg Cost Price Held 1st Owned Source Source Date Date Reported
ZYME
ZYMEWORKS INC
Healthcare 27.44% 18.83% #1
Prev: #1
10.0 no change no change
P
S
22,970,388 $604,810,316 2022 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ANAB
ANAPTYSBIO INC
Healthcare 17.33% 11.58% #2
Prev: #2
6.9 no change no change
P
S
7,880,094 $382,026,957 2019 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
JAZZ
JAZZ PHARMACEUT...
Healthcare 13.16% 10.79% #3 1
Prev: #4
5.3 no change no change
P
S
1,706,469 $290,099,730 2023 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
CRNX
CRINETICS PHARM...
Healthcare 9.06% 8.57% #4 1
Prev: #5
3.6 no change no change
P
S
4,288,120 $199,611,986 2020 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
CNTA
CENTESSA PHARMA...
Healthcare 3.53% 0.64% #5 17
Prev: #22
3.7 2,565,000 466.4%
P
S
3,115,000 $77,906,150 2021 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
CRSP
CRISPR THERAPEU...
Healthcare 3.31% 4.32% #6
Prev: #6
1.3 no change no change
P
S
1,389,276 $72,853,633 2018 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
MBX
MBX BIOSCIENCES...
Healthcare 3.04% 1.78% #7 7
Prev: #14
1.2 no change no change
P
S
2,123,604 $66,978,470 2024 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
IMNM
IMMUNOME INC
Healthcare 2.78% 2.29% #8 4
Prev: #12
1.2 -1,223,825 -30.0%
P
S
2,855,590 $61,338,073 2023 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ORIC
ORIC PHARMACEUT...
Healthcare 2.50% 3.87% #9 1
Prev: #8
1.0 no change no change
P
S
6,728,116 $55,035,989 2020 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
GLPG
GALAPAGOS NV
Healthcare 2.47% 2.77% #10 1
Prev: #11
1.0 no change no change
P
S
1,667,119 $54,514,791 2015 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
XNCR
XENCOR INC
Healthcare 2.26% 3.46% #11 1
Prev: #10
1.0 -2,893,655 -47.1%
P
S
3,251,112 $49,774,525 2016 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
BBOT
BRIDGEBIO ONCOL...
Healthcare 1.60% 1.57% #12 5
Prev: #17
0.6 no change no change
P
S
2,823,126 $35,345,538 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
ETON
ETON PHARMACEUT...
Healthcare 1.56% 2.12% #13
Prev: #13
0.6 no change no change
P
S
2,030,544 $34,336,499 2024 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
CGON
CG ONCOLOGY INC
Healthcare 1.45% #14
Prev: #—
2.6 772,000 no change
NEW
772,000 $32,053,440 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ZBIO
ZENAS BIOPHARMA...
Healthcare 1.30% #15
Prev: #—
2.5 789,500 no change
NEW
789,500 $28,666,745 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
NGNE
NEUROGENE INC
Healthcare 1.19% 1.06% #16 2
Prev: #18
0.5 no change no change
P
S
1,271,342 $26,189,645 2023 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
GPCR
STRUCTURE THERA...
Healthcare 1.06% #17
Prev: #—
2.4 334,380 no change
NEW
334,380 $23,256,129 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
PCVX
VAXCYTE INC
Healthcare 0.94% #18
Prev: #—
2.4 450,000 no change
NEW
450,000 $20,763,000 2021 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
AQST
AQUESTIVE THERA...
Healthcare 0.77% 0.70% #19 1
Prev: #20
0.3 no change no change
P
S
2,625,000 $16,957,500 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
VYGR
VOYAGER THERAPE...
Healthcare 0.71% 0.15% #20 8
Prev: #28
2.6 3,332,544 497.2%
P
S
4,002,847 $15,731,189 2021 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
CGON
CG ONCOLOGY INC
CALL
CALL Option 0.55% #21
Prev: #—
2.2 292,800 no change
NEW
292,800 $12,157,056 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ATRA
ATARA BIOTHERAP...
Healthcare 0.47% 0.39% #22 2
Prev: #24
0.2 no change no change
P
S
573,183 $10,368,880 2024 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
MNKD
MANNKIND CORP
Healthcare 0.43% #23
Prev: #—
2.2 1,660,000 no change
NEW
1,660,000 $9,412,200 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
NUVB/WS
NUVATION BIO IN...
Unknown 0.39% 0.17% #24 3
Prev: #27
0.2 no change no change
P
S
963,333 $8,631,464 2021 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
EOLS
EVOLUS INC
Healthcare 0.20% #25
Prev: #—
2.1 675,000 no change
NEW
675,000 $4,488,750 2019 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
QURE
UNIQURE NV
Healthcare 0.00% 11.17%
Sold All 😨
(Was: #3)
0.3 -3,988,971 -100.0%
CLOSED
$— 2024 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
TNGX
TANGO THERAPEUT...
Healthcare 0.00% 4.29%
Sold All 😨
(Was: #7)
0.3 -10,630,736 -100.0%
CLOSED
$— 2021 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
APLS
APELLIS PHARMAC...
Healthcare 0.00% 3.74%
Sold All 😨
(Was: #9)
0.3 -3,447,156 -100.0%
CLOSED
$— 2017 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
MDGL
MADRIGAL PHARMA...
Healthcare 0.00% 1.65%
Sold All 😨
(Was: #15)
0.3 -75,000 -100.0%
CLOSED
$— 2017 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
RNA
AVIDITY BIOSCIE...
Healthcare 0.00% 1.60%
Sold All 😨
(Was: #16)
0.3 -765,000 -100.0%
CLOSED
$— 2020 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
ALKS
ALKERMES PLC
Healthcare 0.00% 0.72%
Sold All 😨
(Was: #19)
0.3 -500,000 -100.0%
CLOSED
$— 2025 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
MTSR
METSERA INC
Healthcare 0.00% 0.68%
Sold All 😨
(Was: #21)
0.3 -271,529 -100.0%
CLOSED
$— 2025 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
PRME
PRIME MEDICINE ...
Healthcare 0.00% 0.41%
Sold All 😨
(Was: #23)
0.3 -1,543,326 -100.0%
CLOSED
$— 2022 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
KURA
KURA ONCOLOGY I...
Healthcare 0.00% 0.37%
Sold All 😨
(Was: #25)
0.3 -872,500 -100.0%
CLOSED
$— 2015 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
PEPG
PEPGEN INC
Healthcare 0.00% 0.18%
Sold All 😨
(Was: #26)
0.3 -800,000 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
CMPS
COMPASS PATHWAY...
Healthcare 0.00% 0.07%
Sold All 😨
(Was: #29)
0.3 -265,137 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
Showing 1-25 of 41 holdings

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