Upstream Bio, Inc. (UPB) has 1 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 1 sales totalling $5K. Most recent filing: Sept. 17, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
|---|---|---|---|---|---|---|
| Sept. 17, 2026 filed Sept. 16, 2026 | GRAY MICHAEL CFO and COO | −$4,683 | 853 | −3% | No | |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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