Septerna, Inc. (SEPN) - Dilution Analysis

Visualizing historical and potential share dilution over time

Dilution Analysis

High Risk
Significant dilution risk
Last updated: May 11, 2026

Risk Assessment Details

Potential Dilution: 39.25% of current shares
Recent Dilution: 1305.95% (2 years)
Historical Dilution Factor: significant recent dilution
Outstanding Shares
45M
Potential Supply
18M
Additional shares possible
Splits
None
Past 2 years

Summary

SEPN currently has 44.8M outstanding shares. with moderate dilution risk from 17.6M authorized shares representing 39.3% potential dilution. The company has significantly diluted shareholders by 1305.95% over the past 2 years, indicating aggressive capital raising.

Share Structure Timeline

Outstanding Shares
Total Supply

Historical Data Points

Date Event Outstanding Supply
May 11, 2026

10-Q filing | 44.8M shares outstanding

45M 18M
Mar 09, 2026

10-K filing | 44.3M shares outstanding

44M 18M
Nov 10, 2025

10-Q filing | 44.3M shares outstanding

44M 18M
Aug 11, 2025

10-Q filing | 44.2M shares outstanding

44M 18M
May 15, 2025

10-Q filing | 43.9M shares outstanding

44M 18M
Mar 27, 2025

10-K filing | 44.4M shares outstanding

44M 18M
Nov 20, 2024

10-Q filing | 44.4M shares outstanding

44M 18M
Oct 24, 2024

S-1/A filing: This S-1/A filing from 2024-10-24 details an offering of 15,277,778 shares of common stock with an underwriter option for an additional 2,291,666 shares, at a price of $18.00 per share, resulting in estimated net proceeds of $250.0 million (or $288.3 million if the underwriter option is fully exercised).

3.2M 18M
Oct 21, 2024

S-1/A filing: The company is filing an S-1/A form to register an offering of common stock. The company intends to use the net proceeds from this offering, together with our existing cash, cash equivalents, and marketable securities, as follows: approximately $54 million to advance the continued development of SEP-786, our lead product candidate from our PTH1R program through completion of a Phase 2 clinical trial in hypoparathyroidism patients, and additional molecules targeting PTH1R; approximately $24 million to advance the development of SEP-631 through completion of a Phase 1 clinical trial, and additional small molecules within our MRGPRX2 program; approximately $41 million for other research and development activities, including our TSHR and incretin receptor programs, other new GPCR programs, and continued innovation of our Native Complex PlatformTM; and the remainder to fund working capital and other general corporate purposes.

3.2M 13M
Oct 02, 2024

S-1 filing: The filing is an S-1 form indicating an offering of common stock, with J.P. Morgan, TD Cowen, Cantor, and Wells Fargo Securities as underwriters. It mentions an option for underwriters to purchase additional shares and provides information on the use of proceeds, risk factors, and the proposed Nasdaq trading symbol.

27M 0
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