Ipsen — Major Shareholding Notification 2026

May 18, 2026

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Monthly information relative to the total number of voting rights and shares composing the share capital

(in accordance with Article L.233-8 II of the French Commercial Code and Article 223-16 of the General Regulation of the Autorité des Marchés Financiers

Market: Euronext Paris ISIN Code: FR 0010259150 LEI: 549300M6SGDPB4Z94P11

Total number of shares Date composing the share Total number of voting rights[(1) ] capital Gross total of voting rights: 131,952,432 30 April 2026 83,814,526 Net total* of voting rights: 130,547,791

• (1) Existence of a statutory clause imposing an obligation to declare threshold crossing complementary to the one relative to the legal thresholds (Article 10).

• Gross total = total number of voting rights attached to the total number of shares, including the number of shares which benefit of double voting rights and the number of treasury shares. The « Gross total » is used as a basis for the calculation of threshold crossings.

• ** Net total = total number of voting rights attached to the total number of shares – shares without voting rights.