Upstream Bio, Inc. (UPB) - Dilution Analysis

Visualizing historical and potential share dilution over time

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Dilution Analysis

Medium Risk

Moderate dilution risk

Last updated: May 13, 2026

Risk Assessment Details

Potential Dilution: 26.46% of current shares

Recent Dilution: 1.56% (2 years)

Historical Dilution Factor: minimal recent dilution

Outstanding Shares

54M

Potential Supply

14M

Additional shares possible

Splits

None

Past 2 years

Summary

UPB currently has 54.3M outstanding shares. with moderate dilution risk from 14.4M authorized shares representing 26.5% potential dilution. The company has minimally diluted shareholders by 1.56% over the past 2 years.

Share Structure Timeline

Outstanding Shares

Total Supply

Historical Data Points

Date	Event	Outstanding	Supply
May 13, 2026	10-Q filing \| 54.3M shares outstanding	54M	14M
Mar 26, 2026	10-K filing \| 53.9M shares outstanding	54M	14M
Nov 05, 2025	10-Q filing \| 53.9M shares outstanding	54M	14M
Aug 06, 2025	10-Q filing \| 53.8M shares outstanding	54M	14M
May 06, 2025	10-Q filing \| 53.6M shares outstanding	54M	14M
Mar 12, 2025	10-K filing \| 53.6M shares outstanding	54M	14M
Nov 07, 2024	10-Q filing \| 53.6M shares outstanding	54M	14M
Oct 07, 2024	S-1/A filing: Upstream Bio, Inc. is offering 12,500,000 shares of its common stock in an initial public offering. The initial public offering price is expected to be between $15.00 and $17.00 per share.	N/A	14M

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