Form 4 Filing for Julia C. Mattis

Julia C. Mattis, Chief Licensing Officer at InterDigital, Inc. (IDCC), reported several transactions on March 15, 2026. These transactions involved the vesting of performance-based restricted stock units (RSUs) granted on March 31, 2023, March 15, 2024, and March 31, 2025. On March 15, 2026, 2,372 RSUs vested, along with 98.2674 additional shares representing accrued dividend equivalents. Following this, 1,050 shares were withheld to cover tax liabilities, and fractional shares amounting to 0.2674 were settled in cash. An additional 993 shares were withheld for tax purposes, with fractional shares totaling 1.6526 settled in cash. These transactions occurred under the company's 2017 Equity Incentive Plan. Post-transaction, Mattis holds 8,981.9474 shares.