UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K Saint Louis, Missouri 63141 (Mark one) ☑ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2021 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission file number 001-15169 PERFICIENT, INC. (Exact Name of Registrant as Specified in Its Charter) Delaware No. 74-2853258 (State or other jurisdiction of incorpor ...