X0508 4 2026-03-15 0 0001405495 InterDigital, Inc. IDCC 0001231579 BREZSKI RICHARD 200 BELLEVUE PARKWAY SUITE 300 WILMINGTON DE 19809 0 1 0 0 Chief Financial Officer 0 Common Stock 2026-03-15 4 A 0 21430.5045 0 A 91834.0982 D Common Stock 2026-03-15 4 F 0 9319 362.35 D 82515.0982 D Common Stock 2026-03-15 4 D 0 0.5045 362.35 D 82514.5937 D Common Stock 2026-03-15 4 F 0 3965 362.35 D 78549.5937 D Common Stock 2026-03-15 4 D 0 0.5299 362.35 D 78549.0638 D Common Stock 2026-03-16 4 G 0 1000 0 D 77549.0638 D Common Stock 1951 I By 401k Plan The transaction reported represents the vesting of awards of performance-based restricted stock units granted to the reporting person on March 31, 2023 pursuant to the company's 2017 Equity Incentive Plan in accordance with the company's long-term compensation program. Based on the achievement level of the 2023 cycle performance goal, 200% of the reporting person's target performance-based restricted stock unit awards, or 20,578 restricted stock units, vested on March 15, 2026 together with 852.5045 additional shares representing accrued dividend equivalent units. The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability in connection with the vesting of awards of performance-based restricted stock units described above. The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of awards of performance-based restricted stock units described above. The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability. The restricted stock units were granted to the reporting person on March 31, 2023, March 15, 2024 and March 31, 2025 pursuant to the company's 2017 Equity Incentive Plan in accordance with the company's long-term compensation program and vested on March 15, 2026, together with accrued dividend equivalents. The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of restricted stock units, as described in the previous footnote. Represents a charitable donation to a donor advised fund. As of the most recently published account statement, the reporting person beneficially owned this number of whole shares of common stock pursuant to the InterDigital Savings and Protection Plan. /s/ Amy A. Miraglia, Attorney-in-Fact for Richard J. Brezski 2026-03-17