0001085146-16-002866 SC 13G/A 1 20160209 20160209 Approach Resources Inc 0001405073 1311 510424817 DE 1231 SC 13G/A 34 005-83760 161399884 ONE RIDGMAR CENTRE 6500 WEST FREEWAY, SUITE 800 FORT WORTH TX 76116 8179899000 ONE RIDGMAR CENTRE 6500 WEST FREEWAY, SUITE 800 FORT WORTH TX 76116 Boston Partners 0001386060 980202744 DE 1231 SC 13G/A ONE BEACON STREET BOSTON MA 02108 2129089500 909 THIRD AVENUE NEW YORK NY 10022 Robeco Investment Management, Inc. 20070111 SC 13G/A 1 arexa2_20916.htm ROBECO INVESTMENT MANAGEMENT INC.