Rosen Law Firm reminded purchasers of Cogent Communications Holdings, Inc. common stock between February 29, 2024, and May 1, 2026, inclusive, that September 21, 2026, is the deadline to seek appointment as lead plaintiff in a securities class action. The lawsuit alleges Cogent materially misrepresented the quality of its optical wavelength backlog, customer demand, revenue and margin prospects, dividend sustainability, and the risk that David Schaeffer would need to sell substantial amounts of pledged Cogent stock. The firm said eligible investors may pursue compensation without upfront fees or costs under a contingency fee arrangement. No class has been certified, and investors may retain counsel, remain absent class members, or take no action at this stage.