UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

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☐	Preliminary Proxy Statement
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☐	Definitive Proxy Statement
☑	Definitive Additional Materials
☐	Soliciting Material Pursuant to Rule §240.14a-12
F.N.B. Corporation
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*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the

Shareholder Meeting to Be Held on May 11, 2021.

		Meeting Information
F.N.B. CORPORATION		Meeting Type:        Annual Meeting
		For holders as of:   March 5, 2021
		Date:    May 11, 2021        Time:    8:30 AM Eastern Time
		Location:	Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/FNB21.
		The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/FNB21 and be sure to have the information that is printed in the box marked by the arrow (located on the following page).
	You are receiving this communication because you hold shares in the company named above.
C/O BROADRIDGE             P.O. BOX 1342             BRENTWOOD, NY 11717	This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com, scan the QR Barcode on the reverse side, or easily request a paper copy (see reverse side).
	We encourage you to access and review all of the important information contained in the proxy materials before voting.
		See the reverse side of this notice to obtain proxy materials and voting instructions.

	Before You Vote      How to Access the Proxy Materials
		Proxy Materials Available to VIEW or RECEIVE:
		NOTICE, 2021 PROXY STATEMENT, 2020 ANNUAL REPORT, 2020 FORM 10-K AND 2021 CORPORATE RESPONSIBILITY REPORT
		How to View Online:
		Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com, or scan the QR Barcode below.
		How to Request and Receive a PAPER or E-MAIL Copy:
		If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
		1)  BY INTERNET:        www.proxyvote.com
		2)  BY TELEPHONE:    1-800-579-1639
		3)  BY E-MAIL*:            sendmaterial@proxyvote.com
		*  If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 27, 2021 to facilitate timely delivery.
	How To Vote      Please Choose One of the Following Voting Methods
		Vote By Internet:       Before The Meeting: Go to www.proxyvote.com or from a smartphone, scan the QR Barcode above. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions.       During The Meeting: Go to www.virtualshareholdermeeting.com/FNB21. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

                Voting Items                     

	The Board of Directors recommends you vote FOR each of the Nominees listed below:
	Vote on Directors
	1.	Election of 12 Directors Nominees:
		01) Pamela A. Bena	04) Vincent J. Delie, Jr.	07) David J. Malone	10) Heidi A. Nicholas
		02) William B. Campbell	05) Mary Jo Dively	08) Frank C. Mencini	11) John S. Stanik
		03) James D. Chiafullo	06) Robert A. Hormell	09) David L. Motley	12) William J. Strimbu
	Vote on Proposal 2:
	The Board of Directors recommends you vote FOR the following proposal:
	2.  Advisory approval of the 2020 named executive officer compensation.
	Vote on Proposal 3:
	The Board of Directors recommends you vote FOR the following proposal:
	3.  Ratification of appointment of Ernst & Young LLP as F.N.B.’s independent registered public accounting firm for the 2021 fiscal year.