Position
SIMPLEX TRADING, LLC in Builders FirstSource, Inc.
Back to the book · All holders of BLDR
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 −$326.1K$102.89 → $82.33
| Quarter | Shares | Value | Implied px | Est. mark | Flow | Weight |
|---|---|---|---|---|---|---|
| Q4 2025 | 15.9K | $1.63M | — | — | — | 0.0% |
| Q1 2026 | 19.8K | $1.63M | $82.33 | −$326.1K | $322.2K | 0.0% |