Julia C. Mattis - 15 Mar 2026 Form 4 Insider Report for InterDigital, Inc. (IDCC)

Role: Chief Licensing Officer
Signature: /s/ Ariel E. Greenstein, Attorney-in-Fact for Julia C. Mattis
Issuer symbol: IDCC
Transactions as of: 15 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 17 Mar 2026, 17:23:17 UTC
Previous filing: 30 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mattis Julia C	Chief Licensing Officer	200 BELLEVUE PARKWAY, SUITE 300, WILMINGTON	/s/ Ariel E. Greenstein, Attorney-in-Fact for Julia C. Mattis	17 Mar 2026	0002086712

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IDCC	Common Stock	Award		+2,470	+29%	$0.000000^*	11,027	15 Mar 2026	Direct	F1
transaction	IDCC	Common Stock	Tax liability		-1,050	-9.5%	$362.35^*	9,977	15 Mar 2026	Direct	F2
transaction	IDCC	Common Stock	Disposed to Issuer		-0	-0%	$362.35^*	9,977	15 Mar 2026	Direct	F3
transaction	IDCC	Common Stock	Tax liability		-993	-10%	$362.35^*	8,984	15 Mar 2026	Direct	F4
transaction	IDCC	Common Stock	Disposed to Issuer		-2	-0.02%	$362.35^*	8,982	15 Mar 2026	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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 2,372 restricted stock units, vested on March 15, 2026 together with 98.2674 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 vesting of awards of performance-based restricted stock units described above.
F3	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.
F4	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.
F5	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.