Ambrose Allison
SEC insider (Form 3/4/5 filer). CIK 0002047381. General Counsel at Upstream Bio, Inc. (UPB). 6 reported Form 4/5 transactions since Sep 2024; latest on Sep 16, 2026. Located in WALTHAM, MA.
Companies Ambrose Allison has filed insider reports for
- Upstream Bio, Inc. (UPB): Officer, General Counsel
Ambrose Allison
CIK: 0002047381
Transaction Breakdown
Open Market Buys (P)0 (0.0%)
High conviction signal
Open Market Sales (S)3 (50.0%)
Position reduction
Option Exercises (M)0 (0.0%)
Derivative conversions
Awards (A)3 (50.0%)
Compensation grants
Other (G, F, J, C, D, …)0 (0.0%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
UPB
Upstream Bio, Inc.
Officer
Discretionary Trading P&L
Holdings
Transaction History (6 total)
- Sep 16, 2026UPB
Upstream Bio, Inc.
SaleDirect485 shares at avg. $5.49$3K - Jun 16, 2026UPB
Upstream Bio, Inc.
SaleDirect477 shares at avg. $6.10$3K - Mar 16, 2026UPB
Upstream Bio, Inc.
SaleDirect475 shares at avg. $9.29$4K - Jan 2, 2026UPB
Upstream Bio, Inc.
AwardDirect17K shares- - Feb 6, 2025UPB
Upstream Bio, Inc.
AwardDirectStock Option (Right to Buy)
25K shares- - Dec 16, 2024UPB
Upstream Bio, Inc.
AwardDirectStock Option (Right to Buy)
100K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 16, 2026 | UPB Upstream Bio, Inc. | Sale | 485 | $5.49 | $2,663 | Direct |
| Jun 16, 2026 | UPB Upstream Bio, Inc. | Sale | 477 | $6.10 | $2,910 | Direct |
| Mar 16, 2026 | UPB Upstream Bio, Inc. | Sale | 475 | $9.29 | $4,413 | Direct |
| Jan 2, 2026 | UPB Upstream Bio, Inc. | Award | 17,000 | - | $0 | Direct |
| Feb 6, 2025 | UPB Upstream Bio, Inc. | Award Stock Option (Right to Buy) | 25,000 | - | - | Direct |
| Dec 16, 2024 | UPB Upstream Bio, Inc. | Award Stock Option (Right to Buy) | 100,000 | - | - | Direct |
1-6 of 6 transactions