Calix, Inc (CALX) Institutional Ownership

Ownership Summary

Calix, Inc (NYSE:CALX) showed up in the 13F filings of 321 institutional investors as of December 2025.

• They owned 84.0% of outstanding stock in December 2025, up from 82.3% the prior quarter.
• They increased total shares held in Calix by 9.5% from the prior quarter, while the number of investors in CALX increased 27.38% year over year.
• Of these 321 funds, 184 grew their exposure to Calix, 95 cut back, and 42 maintained positions.
• In total, institutional investors held 58.62Mn shares in Calix as of December 2025, up by 5.08Mn shares quarter on quarter, and up 299.78K shares year over year.
• BlackRock, Inc. holds the largest position in CALX at 11.46Mn shares as of December 31, 2025, or 16.43% of shares outstanding.
• The most significant purchases of CALX for the quarter ending December 2025 came from FULLER & THALER ASSET MANAGEMENT, INC. (2.19Mn), WESTFIELD CAPITAL MANAGEMENT CO LP (461.2K), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (387.82K), Alyeska Investment Group, L.P. (375.13K), NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO (350.15K).
• The largest sales of CALX for the quarter ending December 2025 came from MILLENNIUM MANAGEMENT LLC (523.01K), TUDOR INVESTMENT CORP ET AL (455.86K), UBS Group AG (448.72K), BlackRock, Inc. (255.31K), Assenagon Asset Management S.A. (208.46K).
• Calix's 10 largest shareholders as of December 2025 include BlackRock, Inc. (11.46Mn), VANGUARD GROUP INC (8.3Mn), State Street Corp (2.36Mn), FULLER & THALER ASSET MANAGEMENT, INC. (2.19Mn), ALLIANCEBERNSTEIN L.P. (1.46Mn), CONGRESS ASSET MANAGEMENT CO (1.45Mn), GEODE CAPITAL MANAGEMENT, LLC (1.45Mn), MILLENNIUM MANAGEMENT LLC (1.44Mn), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (1.28Mn), WESTFIELD CAPITAL MANAGEMENT CO LP (1.15Mn) per Business Quant data.