Q1 2026 · 19 funds · 1000 position changes
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100M in assets. It discloses their equity holdings as of the end of each quarter. We track 20 specialist biotech hedge funds and compare their filings quarter-over-quarter to identify new positions, exits, increases, and decreases.
New means the fund initiated a position it didn't hold last quarter. Increased means they added shares to an existing position. Decreased means they trimmed shares. Exited means they sold their entire position. New positions and exits are the strongest signals — they represent active portfolio decisions, not incremental adjustments.
13F filings are due within 45 days of each quarter end (mid-February, mid-May, mid-August, mid-November). We parse new filings from EDGAR as they're published. The data shown reflects the most recent quarter's filings.
The SEC gives institutional managers 45 days after quarter-end to file their 13F. This means the data reflects positions as of the prior quarter-end, not today. Despite the lag, 13F data is valuable because it reveals the conviction-level decisions of biotech's most informed investors — the kind of positions that take months to build.
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