X0306 4/A 2018-02-23 2017-02-27 0 0001409375 ORION ENERGY SYSTEMS, INC. OESX 0001476048 Altschaefl Michael W 2210 WOODLAND DRIVE MANITOWOC WI 54220 1 1 0 0 Chief Executive Officer Common Stock 2018-02-23 4 P 0 24000 0.8603 A 371076 D The price in Column 4 is a weighted average price. The prices actually paid ranged from $0.849 to $0.8699. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price. The Form 4 filed on February 27, 2018, reported that the reporting person held 363,829 shares following the reported transaction. This amended Form 4 is being filed to report that the reporting person actually held 371,076 shares following the transaction. /s/ Steven R. Barth, Attorney-in-Fact for Michael W. Altschaefl 2018-02-27