Janice K. Mahon - 07 Mar 2026 Form 4 Insider Report for UNIVERSAL DISPLAY CORP \PA\ (OLED)

Role: SVP of Tech Commercialization
Signature: /s/ Janice K. Mahon (by Mauro Premutico as power of attorney)
Issuer symbol: OLED
Transactions as of: 07 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 10 Mar 2026, 16:00:07 UTC
Previous filing: 06 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mahon Janice K	SVP of Tech Commercialization	C/O UNIVERSAL DISPLAY CORPORATION, 250 PHILLIPS BLVD., EWING	/s/ Janice K. Mahon (by Mauro Premutico as power of attorney)	10 Mar 2026	0001423446

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OLED	Common Stock	Award		+2,604	+4.5%	$0.000000^*	61,115	07 Mar 2026	Direct	F1
transaction	OLED	Common Stock	Tax liability		-941	-1.5%	$97.03^*	60,174	07 Mar 2026	Direct	F2
transaction	OLED	Common Stock	Award		+8,597	+14%	$0.000000^*	68,771	07 Mar 2026	Direct	F1
transaction	OLED	Common Stock	Tax liability		-4,113	-6%	$97.03^*	64,658	07 Mar 2026	Direct	F3
transaction	OLED	Common Stock	Award		+2,777	+4.3%	$0.000000^*	67,435	07 Mar 2026	Direct	F1
transaction	OLED	Common Stock	Tax liability		-1,420	-2.1%	$97.03^*	66,015	07 Mar 2026	Direct	F4
transaction	OLED	Common Stock	Tax liability		-1,069	-1.6%	$97.03^*	64,946	07 Mar 2026	Direct	F5

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

Explanation of Responses:

Id	Content
F1	These shares were granted to the Reporting Person as performance units under the Company's Long Term Incentive Plan as part of 2023 compensation and vested on March 7, 2026 subject to the satisfaction of certain performance conditions, which the Company's Human Capital Committee certified on February 17, 2026 as having occurred.
F2	These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2026 of 2,604 shares of restricted stock previously granted to the Reporting Person.
F3	These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2026 of 8,597 shares of restricted stock previously granted to the Reporting Person.
F4	These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2026 of 2,777 shares of restricted stock previously granted to the Reporting Person.
F5	These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2026 of 2,091 shares of restricted stock previously granted to the Reporting Person.