MFS Series Trust IX

03/05/2026 | Press release | Distributed by Public on 03/05/2026 07:53

Summary Prospectus by Investment Company (Form 497K)

SUPPLEMENT TO THE SUMMARY PROSPECTUS

The date of this supplement is March 5, 2026.

MFS® Corporate Bond Fund

MFS® Corporate Bond Portfolio

MFS® Diversified Income Fund

Effective March 31, 2026, the following is added to the table in the sub-section entitled "Portfolio Manager(s)" under the main heading entitled "Summary of Key Information":

Portfolio Manager

Since

Title

Gaetan Poirier

March 2026

Investment Officer of MFS

MULTI-SUM-SUP-I-030526

1

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