Hagens Berman Sobol Shapiro LLP has notified investors in Cogent Communications Holdings, Inc. of a Sept. 21, 2026, lead plaintiff deadline in an ongoing securities class action covering losses between Feb. 29, 2024, and May 1, 2026. The complaint challenges Cogent's disclosures about its optical wavelength backlog, which the firm says was presented as an indicator of expected growth and revenue. Cogent reported $235.6 million in Q2 2026 service revenue on Aug. 6, alongside sequential and year-over-year declines, double-digit off-net revenue drops and fewer customer connections. The allegations cite a 20% sequential backlog decline and removal of 1,500 orders in February 2025, disclosures about excess installation capacity in May 2025, the company's decision to stop providing backlog data in February 2026, and further weakness in wavelength revenue and customer connections in May 2026. Hagens Berman partner Reed Kathrein is leading the investigation. The firm is seeking investors with substantial losses and says whistleblowers with original information may qualify for rewards of up to 30% of a successful SEC recovery.