Several law firms announce an investor class action lawsuit against Calix, Inc. (NYSE: CALX), alleging securities-law violations. The complaints contend that the company violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5, according to the notices distributed by multiple firms. Multiple filings describe a “Class Period” for covered purchasers of Calix securities from January 28, 2026 through April 21, 2026, inclusive. Several outlets also reference a lead-plaintiff process, with investors encouraged to participate and some notices citing specific deadlines for submitting motions to be appointed lead plaintiff, including a July 27, 2026 deadline referenced by at least one firm. Other announcements focus on investors who allegedly suffered losses and encourage them to contact the named firms for information about legal options and participation in the lawsuit. Across the notices, the common theme is that the case involves alleged market-related misconduct under federal securities laws, with claims framed around Section 10(b) and related control-person liability under Section 20(a). No final court outcome is reported in these announcements.