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Zacks Company Profile for Upstream Bio, Inc. (UPB : NSDQ)

• Company Description    Upstream Bio Inc. 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 development which 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. Upstream Bio Inc. is based in WALTHAM, Mass. Number of Employees: 75

• Price / Volume Information    Yesterday's Closing Price: $8.37 Daily Weekly Monthly 20 Day Moving Average: 541,770 shares Shares Outstanding: 54.42 (millions) Market Capitalization: $455.50 (millions) Beta: 1.28 52 Week High: $33.68 52 Week Low: $7.25 Short Interest Ratio:   % Price Change % Price Change Relative to S&P 500 4 Week -12.81% -17.07% 12 Week 5.95% -2.05% Year To Date -69.17% -71.35%

• Address & Contact Information Street Address Phone / Fax Email Address Web URL 890 Winter Street Suite 200 - Waltham,MA 02451 USA ph: 781-208-2466 fax: - ir@upstreambio.com http://www.upstreambio.com

• General Corporate Information    Officers E. Rand Sutherland - Chief Executive Officer and Director Ronald C. Renaud, Jr. - Chairman Michael Paul Gray - Chief Financial and Operating Officer Daniella Beckman - Director Erez Chimovits - Director Peer Information Upstream Bio, Inc. (CORR.) Upstream Bio, Inc. (RSPI) Upstream Bio, Inc. (CGXP) Upstream Bio, Inc. (BGEN) Upstream Bio, Inc. (GTBP) Upstream Bio, Inc. (RGRX) Industry / Sector / Ticker Info Analyst Coverage: No Industry Group: MED-BIOMED/GENE Sector: Medical CUSIP: 91678A107 SIC: 2834 Fiscal Year Fiscal Year End: December Last Reported Quarter: 03/01/26 Next Expected EPS Date: 08/05/26 Share - Related Items Shares Outstanding: 54.42 Most Recent Split Date: (:1) Beta: 1.28 Market Capitalization: $455.50 (millions)

• EPS Information     • Dividend Information Analyst Coverage: No Dividend Yield: 0.00% Current Fiscal Quarter EPS Consensus Estimate: $-0.79 Indicated Annual Dividend: $0.00 Current Fiscal Year EPS Consensus Estimate: $-2.99 Payout Ratio: Number of Estimates in the Fiscal Year Consensus: 6.00 Change In Payout Ratio: Estmated Long-Term EPS Growth Rate: % Last Dividend Paid: NA - $0.00 Next EPS Report Date: 08/05/26

• Fundamental Ratios P/E Current FY Estimate: - Trailing 12 Months: - PEG Ratio: - Price Ratios Price/Book: 1.50 Price/Cash Flow: - Price / Sales: 137.11 EPS Growth vs. Year Ago Period: -47.06% vs. Previous Quarter: 5.06% Sales Growth vs. Year Ago Period: 82.69% vs. Previous Quarter: 54.79% ROE 03/31/26 - -43.82 12/31/25 - -36.48 09/30/25 - -28.71 ROA 03/31/26 - -42.27 12/31/25 - -35.38 09/30/25 - -27.94 Current Ratio 03/31/26 - 23.14 12/31/25 - 26.15 09/30/25 - 32.67 Quick Ratio 03/31/26 - 23.14 12/31/25 - 26.15 09/30/25 - 32.67 Operating Margin 03/31/26 - -4,718.96 12/31/25 - -5,026.03 09/30/25 - -4,366.77 Net Margin 03/31/26 - -4,718.96 12/31/25 - -5,026.03 09/30/25 - -4,366.77 Pre-Tax Margin 03/31/26 - -4,718.96 12/31/25 - -5,026.03 09/30/25 - -4,366.77 Book Value 03/31/26 - 5.59 12/31/25 - 6.29 09/30/25 - 7.02 Inventory Turnover 03/31/26 - - 12/31/25 - - 09/30/25 - - Debt-to-Equity 03/31/26 - 0.00 12/31/25 - 0.00 09/30/25 - 0.00 Debt-to-Capital 03/31/26 - 0.00 12/31/25 - 0.00 09/30/25 - 0.00

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