UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of report (date of earliest event reported): November 05, 2025 |
UPSTREAM BIO, INC.
(Exact name of registrant as specified in its charter)
Delaware | 001-42366 | 38-4187694 | ||
(State or other jurisdiction | (Commission file number) | (IRS employer | ||
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890 Winter Street Suite 200 |
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Waltham, Massachusetts |
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(Address of principal executive offices) |
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Registrant’s telephone number, including area code: (781) 208-2466 |
Not Applicable |
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Securities registered pursuant to Section 12(b) of the Act:
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Common Stock, $0.001 par value per share |
| UPB |
| The Nasdaq Global Select Market |
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).
Emerging growth company ☒
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 2.02 Results of Operations and Financial Condition.
On November 5, 2025, Upstream Bio, Inc. (the “Company”) announced its financial results and business highlights for the quarter ended September 30, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K.
The information included under Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
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99.1 |
| Press Release issued by Upstream Bio, Inc. on November 5, 2025, furnished herewith. |
104 |
| Cover Page Interactive Data File (embedded within the Inline XBRL document) |
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
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| Upstream Bio, Inc. |
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Date: | November 5, 2025 | By: | /s/ E. Rand Sutherland |
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| E. Rand Sutherland, M.D. |