Which hedge funds own SION? SIONNA THERAPEUTICS INC, Q2 2026 13F holders
9 of the hedge funds tracked by WhaleCreep disclosed a position in SION (SIONNA THERAPEUTICS INC) in their Q2 2026 13F filings, worth $664.7m in total. The largest holder by portfolio weight is RA Capital Management at 3.8% of its book. 4 managers opened a new position this quarter: Casdin Capital, Tudor Investment, D. E. Shaw & Co, Marshall Wace. 1 exited: Polen Capital Management.
9tracked managers holding
4opened this quarter
1exited this quarter
Which hedge funds hold SION? Current holders by portfolio weight
| Manager | As of | Weight of book | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|
| RA Capital Management | Q2 2026 | 3.8% | $435.7m | 9,905,045 | 0% | held |
| Casdin Capital | Q2 2026 | 0.9% | $17.6m | 400,000 | – | new |
| Viking Global Investors | Q2 2026 | 0.4% | $140.6m | 3,195,181 | 0% | held |
| Citadel Advisors | Q2 2026 | 0.0% | $50.5m | 1,147,636 | -2% | reduced |
| Millennium Management | Q2 2026 | 0.0% | $12.2m | 276,733 | 97% | added |
| Tudor Investment | Q2 2026 | 0.0% | $993.1k | 22,575 | – | new |
| Point72 Asset Management LP | Q2 2026 | 0.0% | $2.2m | 49,328 | -64% | reduced |
| D. E. Shaw & Co | Q2 2026 | 0.0% | $4.5m | 101,644 | – | new |
| Marshall Wace | Q2 2026 | 0.0% | $554.2k | 12,599 | – | new |
Exited since the previous quarter
| Manager | Prior weight | Prior value |
|---|---|---|
| Polen Capital Management | 1.1% | $1.1m |
How has hedge fund ownership of SION changed?
| Quarter | Managers holding | Combined value |
|---|---|---|
| Q2 2026 | 9 | $664.7m |
| Q1 2026 | 6 | $584.2m |
| Q4 2025 | 3 | $540.2m |
| Q3 2025 | 5 | $404.0m |
| Q2 2025 | 6 | $239.7m |
| Q1 2025 | 4 | $141.5m |
Counts every tracked manager that disclosed SION in that quarter's filing, including managers that have since stopped filing.