Position in XNCR
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$26,326,980
-$23,447,544 QoQ
Shares Held
2,183,000
-32.9% QoQ
Ownership
2.94%
of shares outstanding
% of Portfolio
1.25%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in XNCR Over Time
Shares Held
Position Value (USD)
Derivatives in XNCR
reported options exposure · as of Dec 31, 2025CallValue
$1,033,425
CallShares
67,500
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Biotechnology
Healthcare · as of Jun 30, 2026EcoR1 Capital, LLC holds $1,935,887,028 across 29 Biotechnology names.
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ZYME |
Zymeworks Inc.
|
22,970,388 | $600,445,942 | |
| 2 | ANAB |
Anaptysbio, Inc
|
7,880,094 | $531,906,345 | |
| 3 | AKTS |
Aktis Oncology, Inc.
|
4,824,469 | $155,492,635 | |
| 4 | CGON |
CG Oncology, Inc.
|
1,494,300 | $106,170,015 | |
| 5 | CRSP |
CRISPR Therapeutics AG
|
1,389,276 | $75,771,113 | |
| 6 | ORIC |
Oric Pharmaceuticals, Inc.
|
6,728,116 | $72,865,496 | |
| 7 | TRAX |
First Tracks Biotherapeutics, Inc.
|
3,174,519 | $63,871,322 | |
| 8 | LKFT |
Lakefront Biotherapeutics NV
|
1,667,119 | $49,980,227 |
All Filings in XNCR
Export CSV
26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $26,326,980 | 2,183,000 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $1,033,425 | 67,500 | Call | Sole | 2026-02-17 | |
| 2025-12-31 | $49,774,524 | 3,251,112 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $72,078,116 | 6,144,767 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $48,297,868 | 6,144,767 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $65,380,320 | 6,144,767 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $141,206,745 | 6,144,767 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $107,194,665 | 5,330,416 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $100,904,774 | 5,330,416 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $117,962,106 | 5,330,416 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $112,147,814 | 5,282,516 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $106,442,697 | 5,282,516 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $131,904,424 | 5,282,516 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $147,329,371 | 5,282,516 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $137,556,716 | 5,282,516 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $137,239,765 | 5,282,516 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $144,579,725 | 5,282,416 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $132,566,410 | 4,968,756 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $196,832,972 | 4,906,106 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $160,233,421 | 4,906,106 | Shares | Sole | 2021-11-22 | |
| 2021-06-30 | $169,211,595 | 4,906,106 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $211,007,176 | 4,900,306 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $198,388,751 | 4,547,072 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $176,380,922 | 4,547,072 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $147,279,662 | 4,547,072 | Shares | Sole | 2020-08-14 | |
| 2020-03-31 | $74,746,523 | 2,501,557 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||