X0306 4 2018-09-21 0 0001183765 Molecular Templates, Inc. MTEM 0001713663 Longitude Capital Partners III, LLC 2740 SAND HILL ROAD SECOND FLOOR MENLO PARK CA 94025 0 0 1 0 0001674099 Longitude Venture Partners III, L.P. 2740 SAND HILL ROAD SECOND FLOOR MENLO PARK CA 94025 0 0 1 0 0001253886 ENRIGHT PATRICK G 2740 SAND HILL ROAD SECOND FLOOR MENLO PARK CA 94025 0 0 1 0 0001431159 Tammenoms Bakker Juliet 2740 SAND HILL ROAD SECOND FLOOR MENLO PARK CA 94025 0 0 1 0 Common Stock 2018-09-21 4 P 0 365000 5.50 A 3261535 I By Longitude Venture Partners III, L.P. These shares are held by Longitude Venture Partners III, L.P. ("Longitude Venture III"). This report is filed jointly by Longitude Capital Partners III, LLC ("Longitude Capital III"), Longitude Venture III, Patrick G. Enright ("Mr. Enright"), and Juliet Tammenoms Bakker ("Ms. Bakker"), all of whom share beneficial ownership of more than 10% of the capital stock of the Issuer. Longitude Capital III is the general partner of Longitude Venture III and may be deemed to share voting and investment power over the shares held by Longitude Venture III. Mr. Enright and Ms. Bakker are the managing members of Longitude Capital III and may be deemed to share voting and investment power over the shares held by Longitude Venture III. Each of Longitude Capital III, Mr. Enright and Ms. Bakker disclaims beneficial ownership of such shares except to the extent of its, his or her pecuniary interest therein. /s/ Patrick G. Enright, individually, and as Managing Member of Longitude Capital III, and as Managing Member of Longitude Capital III, General Partner of Longitude Venture III /s/ Juliet Tammenoms Bakker 2018-09-25