UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-K Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ☒ For the fiscal year ended December 31, 2023 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from __________ -to- __________ Commission File Number: 1-6314 Tutor Perini Corporation (Exact name of registrant as specified in its charter) Massachusetts 04-1717070 (State or Oth ...