| Id | Content |
|---|---|
| F1 | The transaction reported represents the partial vesting of an award of performance-based restricted stock units granted to the reporting person on March 31, 2021 pursuant to the company's 2017 Equity Incentive Plan in accordance with the company's long-term compensation program. Based on the achievement of one Milestone goal, 10% of the reporting person's target Milestone restricted stock unit award, or 694 restricted stock units, vested on December 15, 2023, together with 42.2424 additional shares representing accrued dividend equivalent units. |
| F2 | 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. |
| F3 | The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of restricted stock units, as described in Note 1. |
| F4 | 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. |