Insider · CIK 0001438421
Stephen W Webster
director
Files at GRTS (Gritstone bio, Inc.), NXTC (NextCure, Inc.), CGEM (Cullinan Therapeutics, Inc.). First filing -, latest -.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
0 / 0
$0 bought, $0 sold
Signals
This insider’s open-market buys and sells, scored.
No scored open-market trades yet.
Transactions
Every row this insider has filed, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jun 20, 2025 | NXTC NextCure, Inc. | AGrant or award Stock Option (Right to Buy)derivative | +18,700 | $0.00 | $0 | 18,700 | Jun 24, 2025 |
| Jun 12, 2025 | CGEM Cullinan Therapeutics, Inc. | AGrant or award Stock Option (Right to Buy)derivative | +38,513 | $0.00 | $0 | 38,513 | Jun 16, 2025 |
| Apr 4, 2025 | GRTS Gritstone bio, Inc. | JOther Common Stock | -25,000 | $0.00 | $0 | 0 | Apr 8, 2025 |
| Apr 4, 2025 | GRTS Gritstone bio, Inc. | JOther Stock Option (Right to Buy)derivative | -103,600 | $0.00 | $0 | 0 | Apr 8, 2025 |
| Apr 4, 2025 | GRTS Gritstone bio, Inc. | JOther Stock Option (Right to Buy)derivative | -7,379 | $0.00 | $0 | 0 | Apr 8, 2025 |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.