X0508 4 2025-11-04 0 0001406666 CALIX, INC (CALX) 0001483757 Russo Carl C/O CALIX, INC. 3155 OLSEN DRIVE, SUITE 450 SAN JOSE CA 95117 1 0 1 0 1 Common Stock 2025-11-04 4 S 0 395000 64 D 1719188 I See Footnote Common Stock 2025-11-04 4 S 0 12035 65.1088 D 1707153 I See Footnote Common Stock 2025-11-04 4 S 0 12845 66.0028 D 1694308 I See Footnote Common Stock 2025-11-04 4 S 0 120 66.47 D 1694188 I See Footnote Common Stock 13782 I See Footnote Common Stock 2025-11-06 4 M 0 200000 12.63 A 3953070 D Stock Option (right to buy) 12.63 2025-11-06 4 M 0 200000 0 D 2030-05-22 Common Stock 200000 600000 D Shares held by The Crescentico Trust, Carl Russo, Trustee. Sales reported on the Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 25, 2025. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $64.44 to $65.40, inclusive. Full information on the number of shares sold at each sale price is available upon request. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $65.45 to $66.325, inclusive. Full information on the number of shares sold at each sale price is available upon request. Shares held by Equanimous Investments. The managing members of Equanimous Investments are Carl Russo and Tim Pasquinelli. These individuals may be deemed to have shared voting and investment power over the shares held by Equanimous Investments. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein. 100% of the shares subject to the option were fully vested and exercisable on May 22, 2024. /s/ Tom Gemetti as Attorney-in-Fact for Carl Russo 2025-11-06