Julia C. Mattis Ownership Update in InterDigital, Inc.

The filing reports an update on the ownership of Julia C. Mattis, Chief Licensing Officer of InterDigital, Inc. As of September 17, 2025, Mattis owns 7,461 shares of common stock in the company. These shares include restricted stock units granted under the company's 2017 and 2025 Equity Incentive Plans, as well as restricted stock units received from dividend equivalents on unvested restricted stock units. The filing highlights that dividend equivalents accrue on unvested restricted stock units when cash dividends are paid on the company's common stock. The document is signed by Ariel E. Greenstein, Attorney-in-Fact for Julia C. Mattis.