Harleysville (HGIC) DEFA14A Additional proxy soliciting materials

Exhibit 99.4

Complementary Geographic Distribution Networks Independent Agency Partners States where Harleysville has agency partners States where Allied has agency partners States where both Harleysville and Allied have agency partners No current agency partners Issued Oct. 11, 2011

This communication may be deemed to be solicitation material in respect of the proposed transactions. In connection with the proposed transactions, a proxy statement of Harleysville Group Inc. and other materials will be filed with the SEC. WE URGE INVESTORS TO READ THE PROXY STATEMENT AND THESE OTHER MATERIALS CAREFULLY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT HARLEYSVILLE GROUP INC. AND THE PROPOSED TRANSACTIONS. Investors will be able to obtain free copies of the proxy statement (when available) as well as other filed documents containing information about Harleysville Group Inc. on the SEC’s website at http://www.sec.gov. Free copies of Harleysville Group Inc.’s SEC filings are also available from Harleysville Group Inc., 355 Maple Avenue, Harleysville, PA 19438-2297, Attention: Mark R. Cummins, Executive Vice President, Chief Investment Officer & Treasurer.

Issued Oct. 11, 2011