X0306 4 2018-01-17 0 0000007039 TRECORA RESOURCES TREC 0001481601 Williamson Mark D 4403 OAK TRAIL COURT SUGAR LAND TX 77479 0 1 0 0 Vice President of Marketing common stock 2018-01-17 4 A 0 361 A 22870 D common stock 2018-01-17 4 F 0 110 13.85 D 22760 D Awarded for 30 years service Withheld for tax liability Mark Williamson 2018-01-19