X0306 4 2013-09-19 0 0000874238 STERLING CONSTRUCTION CO INC STRL 0001556996 MacKenna Peter E 20810 FERNBUSH LANE HOUSTON TX 77073 1 1 0 0 Chief Executive Officer Common Stock 2013-09-19 4 F 0 5470 9.44 D 194530 D These shares were part of a September 2012 restricted stock award, a portion of which was released from restrictions on September 19, 2013. The shares were retained by the Company at the request of the Reporting Person to satisfy the Company's tax withholding requirements (based on the closing price of the Company's stock on September 19, 2013) arising from the release of restrictions as permitted by the plan pursuant to which the restricted stock award was made. Of these shares 180,000 are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances. Roger M. Barzun under a Power of Attorney 2013-11-18