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Exhibit 21.1

List of Subsidiaries of Simon Property Group, Inc.

Subsidiary

  ​ ​ ​

Jurisdiction

 

Simon Property Group, L.P.

Indiana

The Retail Property Trust

Massachusetts

Simon Property Group (Illinois), L.P.

Illinois

Simon Property Group (Texas), L.P.

Texas

M.S. Management Associates, Inc.

Delaware

Simon Property Group Administrative Services Partnership, L.P.

Delaware

Kravco Simon Investments, L.P.

Pennsylvania

Premium Outlet Partners, L.P.

Delaware

SPG Mayflower, LLC

Delaware

The Simon Realty Group, LLC

Delaware

Simon Services, Inc.

Delaware

Simon Global Development B.V.

Netherlands

Simon MAC S.a.r.l.

Luxembourg

Simon International S.a.r.l.

Luxembourg

List of Subsidiaries of Simon Property Group, L.P.

Subsidiary

  ​ ​ ​

Jurisdiction

 

The Retail Property Trust

Massachusetts

Simon Property Group (Illinois), L.P.

Illinois

Simon Property Group (Texas), L.P.

Texas

M.S. Management Associates, Inc.

Delaware

Simon Property Group Administrative Services Partnership, L.P.

Delaware

Kravco Simon Investments, L.P.

Pennsylvania

Premium Outlet Partners, L.P.

Delaware

SPG Mayflower, LLC

Delaware

The Simon Realty Group, LLC

Delaware

Simon Services, Inc.

Delaware

Simon Global Development B.V.

Netherlands

Simon MAC S.a.r.l.

Luxembourg

Simon International S.a.r.l.

Luxembourg

Omits names of subsidiaries that as of December 31, 2025 were not, in the aggregate, “significant subsidiaries.”