AC Immune SA (ACIU) - Dilution Analysis

Visualizing historical and potential share dilution over time

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Dilution Analysis

Low Risk

Limited dilution potential

Last updated: March 13, 2026

Risk Assessment Details

Potential Dilution: 11.79% of current shares

Recent Dilution: 1.33% (2 years)

Historical Dilution Factor: minimal recent dilution

Outstanding Shares

100M

Potential Supply

12M

Additional shares possible

Splits

None

Past 2 years

Summary

ACIU currently has 102M outstanding shares. with limited dilution risk as only 12M additional shares (11.8%) are authorized for issuance. The company has minimally diluted shareholders by 1.33% over the past 2 years.

Share Structure Timeline

Outstanding Shares

Total Supply

Historical Data Points

Date	Event	Outstanding	Supply
Mar 13, 2026	20-F filing \| 101.7M shares outstanding	100M	12M
Mar 13, 2025	20-F filing \| 100.4M shares outstanding	100M	12M
Mar 14, 2024	20-F filing \| 99.2M shares outstanding	99M	12M
Mar 14, 2024	F-3 filing: AC Immune SA may offer, from time to time, common shares, debt securities, warrants, purchase contracts, units or subscription rights for up to $350,000,000.	99M	12M
Mar 16, 2023	20-F filing \| 83.6M shares outstanding	84M	12M
Mar 22, 2022	20-F filing \| 83.5M shares outstanding	83M	12M
Apr 28, 2021	F-3 filing: AC Immune SA may offer common shares, senior debt securities, subordinated debt securities, warrants, purchase contracts, units or subscription rights up to an aggregate initial offering price of $350,000,000.	73M	12M
Mar 23, 2021	20-F filing \| 71.9M shares outstanding	72M	12M
Oct 23, 2020	F-3 filing: AC IMMUNE SA is offering 11,999,999 common shares by the selling shareholder, as indicated in the F-3 filing on 2020-10-23.	72M	12M

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