X0609 4 2026-09-02 0001674632 Beta Bionics, Inc. BBNX 0002048500 Mensinger Mike false C/O BETA BIONICS, INC. 11 HUGHES IRVINE CA 92618 false true false false Chief Product Officer 0 Common Stock 2026-09-02 4 S 0 4375 19.1131 D 180040 D The shares were sold to cover tax withholding obligations associated with the vesting of restricted stock units. The weighted average sale price for the transaction reported was $19.1131 and the range of prices were between $18.89 and $19.545. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided. /s/ Stephen Feider, Attorney-in-Fact 2026-09-03