N-CSR Item 12(b) - Exhibits: Certifications
SECTION 906 CERTIFICATION
Pursuant to 18 U.S.C.§ 1350, the undersigned officers of Federated MDT Series on behalf of Federated MDT All Cap Core Fund, Federated MDT Balanced Fund, Federated MDT Large Cap Growth Fund, Federated MDT Small Cap Core Fund, Federated MDT Small Cap Growth Fund (the “Registrant”), hereby certify, to the best of our knowledge, that the Registrant’s Report on Form N-CSR for the period ended January 31, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities and Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.
Dated: March 24, 2017
/s/ J. Christopher Donahue
J. Christopher Donahue
Title: President, Principal Executive Officer
Dated: March 24, 2017
/s/ Lori A. Hensler
Lori A. Hensler
Title: Treasurer, Principal Financial Officer
This certification is being furnished solely pursuant to 18 U.S.C.§ 1350 and is not being filed as part of the Report or as a separate disclosure document.