Additional Proxy Soliciting Materials (definitive) (defa14a)

Proxy Materials Available to VIEW or RECEIVE:

PROXY STATEMENT FOR THE 2018 ANNUAL MEETING OF SHAREHOLDERS

ANNUAL REPORT ON FORM 10-K IN A COMBINED DOCUMENT FOR THE FISCAL YEAR ENDED DECEMBER 31, 2017

How to View Online:

Have the information that is printed in the box marked by the arrow à XXXX XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com.

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 à XXXX XXXX XXXX XXXX (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 May 7, 2018 to facilitate timely delivery.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. 1)

Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box:



¨	Preliminary Proxy Statement

	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨	Definitive Proxy Statement

x	Definitive Additional Materials

¨	Soliciting Material under Rule 14a-12

S&T Bancorp, Inc.
(Name of registrant as specified in its charter)

(Name of person(s) filing proxy statement, if other than the registrant)

Payment of Filing Fee (Check the appropriate box):

x	No fee required.

¨	Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

	(1)	Title of each class of securities to which transaction applies:

	(2)	Aggregate number of securities to which transaction applies:

	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

	(4)	Proposed maximum aggregate value of transaction:

	(5)	Total fee paid:

¨	Fee paid previously with preliminary materials.

¨	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	(1)	Amount Previously Paid:

	(2)	Form, Schedule or Registration Statement No.:

	(3)	Filing Party:

	(4)	Date Filed:

*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the

Shareholder Meeting to Be Held on May 21, 2018.




		Meeting Information
S&T BANCORP, INC.
		Meeting Type:		Annual Meeting
		For holders as of:		March 22, 2018
		Date: May 21, 2018		Time: 10:00 AM Eastern Time
		Location:	S&T SUPPORT CENTER INDIANA WEST PLAZA 2416 PHILADELPHIA STREET INDIANA, PENNSYLVANIA 15701
			Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/STBA18.
S&T BANCORP, INC. 800 PHILADELPHIA ST. INDIANA, PA 15701
S&T BANCORP, INC. 800 PHILADELPHIA ST. INDIANA, PA 15701	You are receiving this communication because you hold shares in the company named above.
	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 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.

How to Access the Proxy Materials

Please Choose One of the Following Voting Methods



		Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow à XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. During The Meeting : Go to www.virtualshareholdermeeting.com/STBA18. Have the information that is printed in the box marked by the arrow à XXXX XXXX XXXX XXXX (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

Vote on Directors - THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR ALL".
1.	ELECTION OF DIRECTORS TO SERVE TERMS EXPIRING IN 2019
	Nominees:

	01)	Todd D. Brice	08)	Robert E. Kane
	02)	Christina A. Cassotis	09)	David L. Krieger
	03)	Michael J. Donnelly	10)	James C. Miller
	04)	James T. Gibson	11)	Frank J. Palermo, Jr.
	05)	Jeffrey D. Grube	12)	Christine J. Toretti
	06)	Jerry D. Hostetter	13)	Steven J. Weingarten
	07)	Frank W. Jones

Vote on Proposals - THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" PROPOSALS 2 AND 3 AND FOR "1 YEAR" ON PROPOSAL 4.
2.	TO RATIFY THE SELECTION OF KPMG LLP AS S&T'S INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR 2018.
3.	TO APPROVE, ON A NON-BINDING ADVISORY BASIS, THE COMPENSATION OF S&T'S EXECUTIVE OFFICERS.
4.	TO APPROVE, ON A NON-BINDING ADVISORY BASIS, THE FREQUENCY OF FUTURE ADVISORY VOTES ON THE COMPENSATION OF S&T BANCORP, INC.'S NAMED EXECUTIVE OFFICERS.
TO TRANSACT SUCH OTHER BUSINESS AS MAY PROPERLY COME BEFORE THE MEETING OR ANY ADJOURNMENT THEREOF.