Upstream Bio Inc.

10/17/2024 | Press release | Distributed by Public on 10/17/2024 14:18

Statement of Changes in Beneficial Ownership - Form 4

Ownership Submission
FORM 4
Check this box if no longer subject to Section 16, Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
ORBIMED ADVISORS LLC
2. Issuer Name and Ticker or Trading Symbol
Upstream Bio, Inc. [UPB]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle)
601 LEXINGTON AVENUE , 54TH FLOOR
3. Date of Earliest Transaction (Month/Day/Year)
(Street)
NEW YORK NY 10022
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Join/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City) (State) (Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code 4. Securities Acquired (A) or Disposed of (D) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) 6. Ownership Form: Direct (D) or Indirect (I) 7. Nature of Indirect Beneficial Ownership
Code V Amount (A) or (D) Price
Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code 5. Number of Derivative Securities Acquired (A) or Disposed of (D) 6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security 8. Price of Derivative Security 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) 11. Nature of Indirect Beneficial Ownership
Code V (A) (D) Date Exercisable Expriation Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ORBIMED ADVISORS LLC
601 LEXINGTON AVENUE
54TH FLOOR
NEW YORK, NY10022
X X
OrbiMed Capital GP VIII LLC
601 LEXINGTON AVENUE
54TH FLOOR
NEW YORK, NY10022
X X
OrbiMed Advisors Israel II Ltd
5 HAHOSHLIM STREET, BUILDING B
1ST FLOOR
HERZLIYA PITUACH, L34672408
X X
OrbiMed Israel GP II, L.P.
5 HAHOSHLIM STREET, BUILDING B
1ST FLOOR
HERZLIYA PITUACH, L34672408
X X

Signatures

/s/ Carl L. Gordon, Member of OrbiMed Advisors LLC 2024-10-17
**Signature of Reporting Person Date
/s/ Carl L. Gordon, Member of OrbiMed Capital GP VIII LLC 2024-10-17
**Signature of Reporting Person Date
/s/ Carl L. Gordon, Director of OrbiMed Advisors Israel II Limited 2024-10-17
**Signature of Reporting Person Date
/s/ Carl L. Gordon, Director of OrbiMed Israel GP II, L.P. 2024-10-17
**Signature of Reporting Person Date

Explanation of Responses:

(*) If the form is filed by more than one reporting person, see Instruction 5(b)(v).
(**) Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Each share of Series A redeemable convertible preferred stock and Series B redeemable convertible preferred stock automatically converted into shares of the Issuer's common stock on a one-for-1.049 basis immediately prior to the closing of the Issuer's initial public offering and have no expiration date.
(2) These securities are held of record by OrbiMed Israel Partners II, L.P. ("OIP II"). OrbiMed Israel GP II, L.P. ("Israel GP") is the general partner of OIP II, and OrbiMed Advisors Israel II Limited ("Advisors II") is the general partner of Israel GP. By virtue of such relationships, Israel GP and Advisors II may be deemed to have voting and investment power over the securities held by OIP II and, as a result, may be deemed to have beneficial ownership over such securities. Advisors II exercises voting and investment power through an investment committee comprised of Carl L. Gordon, David P. Bonita, and Erez Chimovits ("Chimovits"), each of whom disclaims beneficial ownership of the securities held by OIP II.
(3) These securities are held of record by OrbiMed Private Investments VIII, LP ("OPI VIII"). OrbiMed Capital GP VIII LLC ("GP VIII") is the general partner of OPI VIII, and OrbiMed Advisors LLC ("OrbiMed Advisors") is the managing member of GP VIII. By virtue of such relationships, GP VIII and OrbiMed Advisors may be deemed to have voting power and investment power over the securities held by OPI VIII and, as a result, may be deemed to have beneficial ownership over such securities. OrbiMed Advisors exercises voting and investment power through a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of the securities held by OPI VIII.
(4) Each of Advisors II, Israel GP, OrbiMed Advisors, and GP VIII disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its pecuniary interest therein, if any. OrbiMed Advisors, GP VIII. Advisors II, and Israel GP have designated a representative, Chimovits, an employee of OrbiMed Advisors and a director of Advisors II, to serve on the Issuer's board of directors. This report shall not be deemed an admission that any such person or entity is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.
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