X0306 4 2020-05-26 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 2020-05-26 4 J 0 1000000 0.00 D 3199035 I By Longitude Venture Partners III, L.P. Common Stock 2020-05-26 4 J 0 3495 0.00 A 3495 I See Footnote Common Stock 2020-05-26 4 J 0 2447 0.00 A 2447 I See Footnote Common Stock 2020-05-26 4 J 0 1049 0.00 A 1049 I See Footnote Represents a pro rata distribution, and not a purchase or sale, without additional consideration by Longitude Venture Partners III, L.P. ("Longitude Venture III") to its general and limited partners. These shares are held by 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"). Longitude Capital III is the general partner of Longitude Venture III and may be deemed to have voting, investment and dispositive 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, investment and dispositive 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. Represents a pro rata distribution, and not a purchase or sale, without additional consideration by Longitude Capital III to its members. These shares are held by a limited partnership (the "Partnership") of which the general partner is a trust (the "Trust"). Mr. Enright is the Trustee of the Trust and may be deemed to share voting, investment and dispositive power over the shares held by the Partnership. Each of the Trust and Mr. Enright disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein. Each of the Reporting Persons disclaims the existence of a "group" and, other than Mr. Enright, disclaims beneficial ownership of these securities, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose. These shares are held directly by Ms. Bakker. These shares are held by a trust. Ms. Bakker is the Investment Trustee of such trust and may be deemed to share voting and dispositive power with regard to the reported shares. Ms. Bakker disclaims beneficial ownership of such shares except to the extent of her pecuniary interest therein. Each of the Reporting Persons disclaims the existence of a "group" and, other than Ms. Bakker, disclaims beneficial ownership of these securities, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose. /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 2020-05-28 /s/ Juliet Tammenoms Bakker 2020-05-28