AlphaYouUPB: Ambrose Allison discloses a sale
By AlphaYouPublished Form 4
Ambrose Allison
Reporting filer
Ambrose Allison reported Sale in Upstream Bio, Inc.: 485 units of Common Stock, dated 2026-09-16. The full Form 4 contains 1 transaction entry.
- Disclosed
- Sep 17, 2026
Reported details
1 entry| Security | Owner | Date | Code | Action | Quantity | Price | Following holdings | Reporting delay | Filed terms and references |
|---|---|---|---|---|---|---|---|---|---|
| Common Stock | Ambrose Allison | 2026-09-16 | S | Sale | 485 | 5.49 | 15,563 | 1 day | Filed terms
|
Common Stock
- Owner
- Ambrose Allison
- Date
- 2026-09-16
- Code
- S
- Action
- Sale
- Quantity
- 485
- Price
- 5.49
- Following holdings
- 15,563
- Reporting delay
- 1 day
- Filed terms and references
Filed terms
- security Title: Common Stock
- transaction Date: 2026-09-16
- transaction Form Type: 4
- transaction Code: S
- equity Swap Involved: false
- id: F1
- transaction Shares: 485
- transaction Price Per Share: 5.49
- transaction Acquired Disposed Code: D
- shares Owned Following Transaction: 15563
- direct Or Indirect Ownership: D
Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.
Filing context
- Quantities and prices are shown in the units filed. No trade value is inferred from their product.
- Ambrose Allison: General Counsel.
- F1: The Issuer has adopted a "sell-to-cover" policy to satisfy the tax withholding obligations of the Reporting Person. The sales reported on this Form 4 represent the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. Such sales were automatic and not at the discretion of the Reporting Person.
Original sources
Prepared automatically from public filing data. Report a correction.