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ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Pennsylvania ( State or other jurisdiction of incorporation 800 Philadelphia Street For the fiscal year ended December 31 , 2020 or For the transition period from to Commission file number 0-12508 S & T BANCORP , INC . ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer ☐ or organization ) Indiana PA ( Address of principal executive offices ) 25-1434426 ( IRS Employer Identification No. ) Trading Symbol STBA 15701 ( zip code ) Registrant's telephone number , including area code ( 800 ) 325-2265 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Name of each exchange on which registered The NASDAQ Stock Market LLC Common Stock , par value $ 2.50 per share Securities registered pursuant to Section 12 ( g ) of the Act : None ( Title of class ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes > Yes ☐ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes > No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No D Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Accelerated filer Smaller reporting company Emerging growth company No ☐ 0 0 0 If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes > No ☐ Yes ☐ No 区 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . No |