UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File Number 0-10436 FORM 10-K (Mark One) L.B. FOSTER COMPANY (Exact name of registrant as specified in its charter) Pennsylvania 25-1324733 For the fiscal year ended December 31, 2020 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to None Indicate by check mark if ...