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AA

SEC Insider//CIK 0002047381

Ambrose Allison

CIK 00020473811 companyWALTHAM, MA

Transactions

5

Companies

1

Filings

4

CIK

0002047381

Recent Transactions

5 trades

Sale
Upstream Bio, Inc.$UPB
Common Stock
2026-03-16$9.29/sh−475→ 16,525 total
Award
Upstream Bio, Inc.$UPB
Common Stock
2026-01-02+17,000→ 17,000 total
Award
Upstream Bio, Inc.$UPB
Stock Option (Right to Buy)
2026-01-02+51,000→ 51,000 total
Award
Upstream Bio, Inc.$UPB
Stock Option (Right to Buy)
2025-02-06+25,000→ 25,000 total
Award
Upstream Bio, Inc.$UPB
Stock Option (Right to Buy)
2024-12-16+100,000→ 100,000 total

Companies

1

Upstream Bio, Inc.
General Counsel
$UPB

Recent Filings

4

Address

UPSTREAM BIO, INC. 890 WINTER STREET, SUITE 200

WALTHAM, MA, 02451

View on SEC.gov