UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the ☒ quarterly period ended March 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: 001-36777 JAMES RIVER GROUP HOLDINGS, LTD. (Exact name of registrant as specified in its charter) Bermuda 98-0585280 (State or ...