X0306 4 2020-06-09 0 0001409375 ORION ENERGY SYSTEMS, INC. OESX 0001463800 Williamson Mark C 123 E. MAIN ST., SUITE 202 MADISON WI 53703 1 0 0 0 Common Stock 2020-06-09 4 A 0 6887 0 A 129725 D Stock Options (right to buy) 4.19 2012-05-23 2021-05-23 Common Stock 22045 22045 D Stock Options (right to buy) 2.03 2013-06-12 2022-06-12 Common Stock 26646 26646 D Stock Options (right to buy) 2.41 2013-12-31 2023-05-28 Common Stock 36568 36568 D Restricted stock granted to the reporting person under the Orion Energy Systems, Inc. 2016 Omnibus Incentive Plan, as amended. The restricted stock vests and becomes exercisable with respect to 1/3 of the restricted stock on each of June 9, 2021, 2022 and 2023, respectively. Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted May 23, 2011, vested and became exercisable in three equal installments on May 23, 2012, 2013 and 2014, respectively. Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted June 12, 2012, vested and became exercisable in three equal installments on June 12, 2013, 2014 and 2015, respectively. Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted May 28, 2013, vested and became exercisable in three equal installments on December 31, 2013, 2014 and 2015, respectively. /s/ Steven R. Barth, Attorney-in-Fact for Mark C. Williamson 2020-06-11