Upstream Bio, Inc. — Director's Dealing 2024

Oct 11, 2024

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Upstream Bio, Inc. (UPB)
CIK: 0002022626
Period of Report: 2024-10-10

Reporting Person: GRAY MICHAEL (N/A)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$5.69	2034-03-26	Common Stock (445040)		Direct
Stock Option (Right to Buy)	$5.69	2034-03-26	Common Stock (152450)		Direct

Footnotes

F1: 25% of the shares underlying this option shall vest on March 26, 2025, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

F2: 25% of the shares underlying this option shall vest on April 5, 2025, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.