CERTIFICATION

Pursuant to 18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906

of the Sarbanes-Oxley Act of 2002

The undersigned, the President and Chief Executive Officer of the SEI Institutional Managed Trust (the “Trust”), with respect to the Trust’s Report on Form N-CSR for the period ended September 30, 2019 as filed with the Securities and Exchange Commission, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

1. such Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Trust.

Dated: December 9, 2019

/s/ Robert A. Nesher                

Robert A. Nesher

President and Chief Executive Officer

CERTIFICATION

Pursuant to 18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906

of the Sarbanes-Oxley Act of 2002

The undersigned, the Controller and Chief Financial Officer of the SEI Institutional Managed Trust (the “Trust”), with respect to the Fund’s Report on Form N-CSR for the period ended September 30, 2019 as filed with the Securities and Exchange Commission, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

1. such Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Trust.

Dated: December 9, 2019

/s/ James J. Hoffmayer                

James J. Hoffmayer

Controller and Chief Financial Officer