Upstream Bio (UPB) 8-KUpstream Bio Reports Third Quarter 2024 Financial Results and Recent Business Highlights

Upstream Bio Reports Third Quarter 2024 Financial Results and Recent Business Highlights

– Advancing Phase 2 clinical trials of verekitug in patients with severe asthma and CRSwNP –

– Commenced startup for a Phase 2 clinical trial in COPD; on track for first patient to be dosed in H2 2025 –

– Completed upsized IPO with gross proceeds of approximately $293 million, extending runway through 2027 –

WALTHAM, Mass. – November 7, 2024 - Upstream Bio, Inc. (Nasdaq: UPB), a clinical-stage company developing treatments for inflammatory diseases, with an initial focus on severe respiratory disorders, today reported financial results for the third quarter ended September 30, 2024, and provided a summary of recent business highlights.

“At Upstream Bio, we continue to make significant progress toward developing verekitug, the only monoclonal antibody currently in clinical development that targets and inhibits the thymic stromal lymphopoietin (TSLP) receptor, in severe respiratory diseases with substantial unmet needs. We expect to report top-line data from our ongoing Phase 2 clinical trials in severe asthma and chronic rhinosinusitis with nasal polyps (CRSwNP) in the second half of 2026 and the second half of 2025, respectively. In addition, we have initiated planning activities for a Phase 2 clinical trial in chronic obstructive pulmonary disease (COPD), and we anticipate dosing our first patient in this program in the second half of 2025,” said Rand Sutherland, M.D., Upstream Bio’s Chief Executive Officer. “Our recently completed initial public offering has provided us with sufficient capital to fund our planned operations through 2027, which will support our strategy of leveraging verekitug’s unique mechanism of action to improve treatment options for patients living with severe inflammatory diseases.”

Dr. Sutherland continued, “This quarter, we also presented data from our Phase 1b multiple ascending dose trial of verekitug in asthma patients. PK/PD modeling of data from this study demonstrated that verekitug is highly potent, with an approximately 50% greater effect on fractional exhaled nitric oxide (FeNO) than has been previously reported with tezepelumab. Our ongoing Phase 2 clinical trials are testing two extended dosing intervals of 12 and 24 weeks for patients with severe asthma, and 12 weeks for patients with CRSwNP, to determine whether verekitug’s potency will translate to a differentiated clinical profile, both from the standpoint of efficacy and dosing frequency.”

Third Quarter 2024 and Recent Business Highlights

Third Quarter 2024 Financial Results

As of September 30, 2024, Upstream had cash, cash equivalents and short-term investments of $220.7 million, as compared to $109.8 million as of December 31, 2023. Upstream’s cash, cash equivalents and short-term investments as of September 30, 2024, together with net proceeds from the closing of its IPO in October 2024 of approximately $268.7 million, is expected to fund planned operations through 2027.

Research and development expenses were $15.4 million for the quarter ended September 30, 2024, compared to $7.8 million for the same period in 2023. The increase of $7.6 million was primarily driven by an increase in clinical and manufacturing expenses related to our verekitug program.

General and administrative expenses were $4.1 million for the quarter ended September 30, 2024, compared to $2.2 million for the same period in 2023. The increase of $1.8 million was primarily driven by an increase in personnel expenses.

Net loss was $16.0 million for the quarter ended September 30, 2024, compared to a net loss of $3.1 million for the same period in 2023. The increase of $12.9 million was largely due to increased research and development and general and administrative expenses, and other income recorded due to a change in the value of preferred stock right tranche liabilities.

Upcoming Events

Upstream Bio expects to participate in the following conferences:

About Upstream Bio

Upstream Bio is a clinical-stage biotechnology company developing treatments for inflammatory diseases, with an initial focus on severe respiratory disorders. The Company is developing verekitug, the only known antagonist currently in clinical development that targets the receptor for thymic stromal lymphopoietin, a cytokine which is a clinically validated driver of inflammatory response positioned upstream of multiple signaling cascades that affect a variety of immune mediated diseases. The Company has advanced this highly potent monoclonal antibody into separate Phase 2 trials for the treatment of severe asthma and chronic rhinosinusitis with nasal polyps and plans to initiate development in chronic obstructive pulmonary disease. Upstream Bio’s team is committed to maximizing verekitug’s unique attributes to address the substantial unmet needs for patients underserved by today’s standard of care. To learn more, please visit www.upstreambio.com.

Upstream Bio intends to use the investor relations page on its website as a means of disclosing material nonpublic information and for complying with its disclosure obligations under Regulation FD. Accordingly, investors should monitor its website in addition to following press releases, filings with the Securities and Exchange Commission (SEC), public conference calls, presentations and webcasts.

Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, each as amended. These statements may be identified by words such as "aims," "anticipates," "believes," “continue,” "could," "estimates," "expects," "forecasts," "goal," "intends," "may," "plans," "possible," "potential," “predict,” “project,” "seeks," “should,” “target,” "will" and variations of these words or similar expressions. Any statements in this press release that are not statements of historical fact may be deemed to be forward-looking statements. These forward-looking statements include, without limitation, express or implied statements regarding: the clinical development of verekitug for the treatment of severe asthma, CRSwNP and COPD, including the initiation, timing, progress and results of ongoing and planned clinical trials; expectations regarding the safety, efficacy or tolerability of verekitug; Upstream’s expected operating expenses and capital expenditure requirements, including its cash runway through 2027; and participation at upcoming conferences. Any forward-looking statements in this press release are based on Upstream’s current expectations, estimates and projections only as of the date of this release and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. Readers are cautioned that actual results, levels of activity, safety, efficacy, performance or events and circumstances could differ materially from those expressed or implied in Upstream’s forward-looking statements due to a variety of risks and uncertainties, which include, without limitation, risks and uncertainties related to: Upstream’s ability to advance verekitug through clinical development, and to obtain regulatory approval of and ultimately commercialize verekitug on the expected timeline, if at all; the initiation, timing, progress and results of clinical trials; Upstream’s ability to fund its development activities and achieve development goals; Upstream’s dependence on third parties to conduct clinical trials and manufacture verekitug, and commercialize verekitug, if approved; Upstream’s ability to attract, hire and retain key personnel, and protect its intellectual property; Upstream’s financial condition and need for substantial additional funds in order to complete development activities and commercialize verekitug, if approved; regulatory

developments and approval processes of the U.S. Food and Drug Administration and comparable foreign regulatory authorities; Upstream’s competitors and industry; and other risks and uncertainties described in Upstream’s current and future filings with the SEC, including those described from time to time under the caption “Risk Factors.” Upstream explicitly disclaims any obligation or undertaking to update any forward-looking statements contained herein to reflect any change in its expectations or any changes in events, conditions or circumstances on which any such statement is based except to the extent required by law, and claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

Investor Contact:
Michael Gray
Chief Financial Officer and Chief Operating Officer
ir@upstreambio.com 

Media Contact:
Teri Dahlman
Red House Communications
teri@redhousecomms.com 

UPSTREAM BIO, INC.

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UPSTREAM BIO, INC.

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