Aaron Deykin - Oct 10, 2024 Form 3 Insider Report for Upstream Bio, Inc. (UPB)

Role
Chief Medical Officer
Signature
/s/ Michael Gray, Attorney-in-Fact
Stock symbol
UPB
Transactions as of
Oct 10, 2024
Transactions value $
$0
Form type
3
Date filed
10/10/2024, 08:12 PM

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding UPB Stock Option (Right to Buy) Oct 10, 2024 Common Stock 280K $3.45 Direct F1
holding UPB Stock Option (Right to Buy) Oct 10, 2024 Common Stock 182K $3.45 Direct F2
holding UPB Stock Option (Right to Buy) Oct 10, 2024 Common Stock 16.3K $4.27 Direct F3
holding UPB Stock Option (Right to Buy) Oct 10, 2024 Common Stock 11.9K $4.87 Direct F4
holding UPB Stock Option (Right to Buy) Oct 10, 2024 Common Stock 107K $6.59 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 25% of the shares underlying this option vested on April 27, 2023, 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 vested on February 14, 2024, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
F3 25% of the shares underlying this option vested on March 3, 2024, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
F4 25% of the shares underlying this option vested on August 10, 2024, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
F5 25% of the shares underlying this option shall vest on May 2, 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.

Remarks:

Exhibit 24 - Power of Attorney