Three separate securities fraud class-action notices concern Hyliion Holdings Corp. (HYLN), Alarum Technologies, Ltd. (ALAR) and Honeywell Aerospace Inc. (HONA). Hyliion investors with substantial losses were invited to seek lead-plaintiff appointment by October 27, 2026, while Alarum investors face an October 5 deadline. Separate notices from Rosen Law Firm and Robbins Geller Rudman & Dowd LLP concern the already filed Honeywell Aerospace action for open-market purchasers between June 29 and September 1, 2026, with a November 23 deadline. The Honeywell complaint alleges undisclosed supplier constraints and a cybersecurity-related False Claims Act investigation. It cites the company’s August 5 report of a 70% year-over-year drop in second-quarter net income, a 32% decline in adjusted earnings per share and reduced 2026 adjusted EBIT-growth guidance, followed by a stock decline of more than 23%. The complaint also cites Honeywell Aerospace’s September 1 agreement to pay more than $2 million to resolve Justice Department False Claims Act allegations involving cybersecurity requirements in a Department of Defense contract. The allegations remain unproven, and no class has been certified.