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May. 01, 2016
PIONEER CORE EQUITY FUND SUPPLEMENT TO THE PROSPECTUS DATED MAY 1, 2016 FUND SUMMARY The following replaces the corresponding information under the heading "Principal investment strategies" in the section entitled "Fund summary": The fund may invest up to 20% of its total assets in securities of non-U.S. issuers, including up to 5% of its total assets in the securities of emerging markets issuers.

May. 01, 2016

PIONEER CORE EQUITY FUND

SUPPLEMENT TO THE PROSPECTUS DATED MAY 1, 2016

FUND SUMMARY
The following replaces the corresponding information under the heading "Principal investment strategies" in the section entitled "Fund summary":

The fund may invest up to 20% of its total assets in securities of non-U.S. issuers, including up to 5% of its total assets in the securities of emerging markets issuers.