Position in SION
as of Jun 30, 2026
· filed Aug 13, 2026
Position Value
$26,856,554
+$14,829,554 QoQ
Shares Held
610,515
+103.5% QoQ
Ownership
1.35%
of shares outstanding
% of Portfolio
0.55%
of 13F equity value
Holder Rank
#16
of 146 holders
Holding Since
Mar 2025
6 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in SION Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026Siren, L.L.C. holds $4,562,402,933 across 78 Biotechnology names. SION ranks #42 (0.6% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | SRRK |
Scholar Rock Holding Corp
|
9,575,013 | $526,625,715 | |
| 2 | KYMR |
Kymera Therapeutics, Inc.
|
2,935,830 | $336,651,626 | |
| 3 | ERAS |
Erasca, Inc.
|
11,397,781 | $208,807,347 | |
| 4 | MANE |
Veradermics, Inc
|
1,655,374 | $203,511,679 | |
| 5 | TNGX |
Tango Therapeutics, Inc.
|
6,179,364 | $193,166,918 | |
| 6 | RVMD |
Revolution Medicines, Inc.
|
900,000 | $168,552,000 | |
| 7 | BCAX |
Bicara Therapeutics Inc.
|
5,602,970 | $166,352,179 | |
| 8 | ARWR |
Arrowhead Pharmaceuticals, Inc.
|
1,715,476 | $139,828,448 |
All Filings in SION
Export CSV
6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $26,856,554 | 610,515 | Shares | Defined | 2026-08-13 | |
| 2026-03-31 | $12,027,000 | 300,000 | Shares | Defined | 2026-05-14 | |
| 2025-12-31 | $12,342,000 | 300,000 | Shares | Defined | 2026-02-13 | |
| 2025-09-30 | $9,558,250 | 325,000 | Shares | Defined | 2025-11-13 | |
| 2025-06-30 | $5,638,750 | 325,000 | Shares | Defined | 2025-08-13 | |
| 2025-03-31 | $3,399,500 | 325,000 | Shares | Defined | 2025-05-23 | |
| No filing history on record for this holder in this stock. | ||||||