Form 4: Upstream Bio Executive Sells Shares
Insider Transaction (Form 4)
Allison Ambrose, General Counsel of Upstream Bio, Inc., sold 485 shares of common stock on September 16, 2026 for $5.49 per share.
Summary
- Open-market sale: disposed of 485 Common Stock at $5.49 ($2,663) on September 16, 2026; holds 15,563 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative signal: an insider sold $2,663 of stock on the open market.
Insider Transactions
Allison Ambrose — Officer (General Counsel)
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-16 | Open-market sale | Common Stock | 485 | $5 | $2.7K | 15,563 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-16 | Open-market sale (485 shares) |
Keywords
insider transaction, Form 4, UPB, Upstream Bio, Inc., bearish, Allison Ambrose
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