Arcturus Therapeutics Holdings Inc.

Item 1. Legal Proceedings.

From time to time, we may be involved in various legal proceedings and subject to claims that arise in the ordinary course of business, including those related to governmental inquiries, intellectual property and commercial relationships, including the arbitration disclosed in our Quarterly Report on Form 10-Q for the period ended June 30, 2025 filed with the SEC on August 11, 2025, and the legal proceeding disclosed in a Current Report on Form 8-K filed with the SEC on October 22, 2025. There have been no material updates with respect to such matters. The subject matter of any such legal proceedings or claims are or will be highly complex and subject to substantial uncertainties. The outcome of any such proceedings or claims, regardless of the merits, are and will be inherently uncertain; therefore, assessing the likelihood of loss and any estimated damages is difficult and subject to considerable judgment.