UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to (State or other jurisdiction of incorporation or organization) 9301 Amberglen Blvd, Suite 100, Austin TX 78729 78729 (Address of principal executive office) (Zi ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-32979 Molecular Templates, Inc. (Exact name of registrant as specified in its charter) Delaware 94-3409596 (State or other jurisdictio ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-32979 Molecular Templates, Inc. (Exact name of registrant as specified in its charter) Delaware 94-3409596 (State or other jurisdiction of ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 For the transition period from to Commission File Number: 001-32979 Molecular Templates, Inc. FORM 10-Q (Exact name of registrant as specified in its charter) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware 94-3409596 (State or other jurisdiction of incorporation or organization) For the quarterly period ended March 31, 2019 9301 Amberglen Blvd Suite 100 Austin, TX 78729 (Address of pri ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-32979 MOLECULAR TEMPLATES, INC. (Exact name of registrant as specified in its charter) Delaware 94-3409596 (State or other jurisdict ...