0001085146-10-000080 SC 13G/A 1 20100205 20100205 Approach Resources Inc 0001405073 1311 510424817 DE 1231 SC 13G/A 34 005-83760 10575644 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 Robeco Investment Management, Inc. 0001386060 980202744 DE 1231 SC 13G/A 909 THIRD AVENUE NEW YORK NY 10022 2129089500 909 THIRD AVENUE NEW YORK NY 10022 SC 13G/A 1 approachres13gamd2final.htm ROBECO INVESTMENT MANAGEMENT, INC