SUPPLEMENT TO PROSPECTUS

The date of this supplement is July 15, 2016.

MFS^® High Yield Pooled Portfolio

Effective after the close of business on July 15, 2016, the second paragraph of the sub-section entitled "Disclosure of Portfolio Holdings" in the sub-section entitled "Investment Adviser" under the main heading "Management of the Fund" is restated in its entirety as follows:

The following information is generally available to you on mfs.com (once you have selected "Individual Investor" as your role, click on "Products & Services" and "Mutual Funds." Next, choose the MFS Global High Yield Fund (a fund that invests in the fund) in the "Select a fund" menu, then click on the "Characteristics" tab):

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