X0508 4 2026-02-03 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 2026-02-03 4 S 0 13477 46.9338 D 1680711 I See Footnote Common Stock 2026-02-03 4 S 0 11523 47.658 D 1669188 I See Footnote Common Stock 13782 I See Footnote Common Stock 3983070 D The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $46.34 to $47.33, inclusive. Full information on the number of shares sold at each sale price is available upon request. Shares held by The Crescentico Trust, Carl Russo, Trustee. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $47.38 to $48.20, 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. Sales reported on the Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 25, 2025. /s/ Tom Gemetti as Attorney-in-Fact for Carl Russo 2026-02-04