Position
SIMPLEX TRADING, LLC in Biogen Inc.
Back to the book · All holders of BIIB
Estimated mark uses implied 13F prices (value ÷ shares). Adds are treated as happening at this quarter’s mark; cuts at last quarter’s. Share jumps can be splits, not buys. This is not realized P&L.
Latest estimated mark $15.9K$175.99 → $183.33
| Quarter | Shares | Value | Implied px | Est. mark | Flow | Weight |
|---|---|---|---|---|---|---|
| Q4 2025 | 30.9K | $5.43M | — | — | — | 0.0% |
| Q1 2026 | 2.16K | $396.7K | $183.33 | $15.9K | −$5.05M | 0.0% |