X0306 4 2021-10-15 0 0001405495 InterDigital, Inc. IDCC 0001676078 Tirri Henry 200 BELLEVUE PARKWAY SUITE 300 WILMINGTON DE 19809 0 1 0 0 Chief Technology Officer Common Stock 2021-10-15 4 A 0 10360 0.00 A 35445.229 D Common Stock 2021-10-15 4 F 0 4834 68.44 D 30611.229 D Common Stock 2021-10-15 4 D 0 1.1858 68.44 D 30610.0432 D The transaction reported represents the partial vesting of an award of performance-based restricted stock units granted to the reporting person on March 31, 2020 pursuant to the company's 2017 Stock Incentive Plan in accordance with the 2020 Long-Term Compensation Program. Based on the achievement of two Milestone goals, 40% of the reporting person's target performance-based restricted stock unit award, or 10,360 restricted stock units, vested on October 15, 2021. The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability in connection with the transaction described in Note 1. The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of restricted stock units, as described in Note 1. /s/ Ariel E. Greenstein, Attorney-in-Fact for Henry Tirri 2021-10-19