[Form 4] InterDigital, Inc. Insider Trading Activity

Rhea-AI Filing Summary

InterDigital, Inc. Chief Licensing Officer Julia C. Mattis reported the vesting of performance-based and time-based restricted stock units tied to the company’s long-term compensation program. On March 15, 2026, 2,372 performance-based RSUs granted on March 31, 2023 vested, along with 98.2674 dividend-equivalent shares.

To cover related tax liabilities, a total of 2,043 shares of common stock were withheld at a price of $362.35 per share, and small fractional share amounts (0.2674 and 1.6526 shares) were settled in cash through dispositions to the issuer. After these non-market transactions, Mattis directly holds 8,981.9474 shares of InterDigital common stock.

Insider Trade Summary

5 transactions reported

Mixed 5 txns

Insider Mattis Julia C

Role Chief Licensing Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,470.267	$0.00	--
Tax Withholding	Common Stock	1,050	$362.35	$380K
Disposition	Common Stock	0.267	$362.35	$96.89
Tax Withholding	Common Stock	993	$362.35	$360K
Disposition	Common Stock	1.653	$362.35	$598.82

Holdings After Transaction: Common Stock — 11,026.867 shares (Direct)

Footnotes (1)

1. 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. 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.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mattis Julia C

(Last) (First) (Middle)

200 BELLEVUE PARKWAY

SUITE 300

(Street)

WILMINGTON DE 19809

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
InterDigital, Inc. [ IDCC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Licensing Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/15/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/15/2026		A(1)		2,470.2674	A	$0	11,026.8674	D
Common Stock	03/15/2026		F(2)		1,050	D	$362.35	9,976.8674	D
Common Stock	03/15/2026		D(3)		0.2674	D	$362.35	9,976.6	D
Common Stock	03/15/2026		F(4)		993	D	$362.35	8,983.6	D
Common Stock	03/15/2026		D(5)		1.6526	D	$362.35	8,981.9474	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

Remarks:

	/s/ Ariel E. Greenstein, Attorney-in-Fact for Julia C. Mattis	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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