Exhibit (10)(J)(3)

FOURTH AMENDMENT TO LEASE AGREEMENT

THIS FOURTH AMENDMENT TO AGREEMENT OF LEASE (hereinafter Fourth Amendment) is effective as of the
1stday of January, 2011 between Harleysville, Ltd., a
Pennsylvania limited partnership (hereinafter Lessor), and Harleysville Mutual Insurance Company, a Pennsylvania insurance corporation doing business at 355 Maple Avenue, Harleysville, PA 19438 (hereinafter Lessee).

WITNESSETH:

WHEREAS, Lessor and Lessee entered into a Lease Agreement dated as of January 1, 1995, for all that certain parcel of land, together with buildings and improvements erected thereon as set forth in
Exhibit A to the Lease, which was amended by an Amendment to Lease Agreement dated as of January 1, 2000, and which was further amended by the Second Amendment to Lease Agreement dated as of January 1, 2005, and the Third
Amendment to Lease Agreement dated as of January 1, 2010 (collectively the Lease); and,

WHEREAS, Lessor and
Lessee desire to amend the Lease with regard to continuing its term for another year.

NOW, THEREFORE, the parties hereto, for
the mutual promises hereinafter contained, intending to be legally bound, do hereby agree as follows:



|1. | Section 2 of the Lease shall be deleted in its entirety and the following substituted in its place:
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The term of this Lease shall be from January 1, 2011 to December 31, 2011.



|2. | All terms, conditions, and provisions of the Lease shall remain the same and are hereby ratified and confirmed, except as amended herein.
|-- | -----------------------------------------------------------------------------------------------------------------------------------------



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IN WITNESS WHEREOF, the Lessor and the Lessee have set their hands and seals the day and
year first above written.



|        |  |                           |  |  |  |                                       |  |                                         
|------- |  | ------------------------- |  |  |  | ------------------------------------- |  | ----------------------------------------
|        |  |                           |  |  |  | Lessor: HARLEYSVILLE, LTD.           
|        |  |                           |  |  |  | BY:                                   |  | HARLEYSVILLE GROUP INC., General Partner
|        |  |                           |  | 
|Attest: |  |                           |  |  |  | BY:                                   |  |                                         
|        |  | David W. Galloway, III    |  |  |  |                                       |  | Arthur E. Chandler                      
|        |  | Vice President and        |  |  |  |                                       |  | Senior Vice President and CFO           
|        |  | Associate General Counsel |  |  |  |                                       |  |                                         
|        |  |                           |  | 
|        |  |                           |  |  |  | BY:                                   |  | HARLEYSVILLE PREFERRED INSURANCE        
|        |  |                           |  |  |  |                                       |  | COMPANY, Limited Partner                
|        |  |                           |  | 
|Attest: |  |                           |  |  |  | BY:                                   |  |                                         
|        |  | David W. Galloway, III    |  |  |  |                                       |  | David K. Bond                           
|        |  | Assistant Secretary       |  |  |  |                                       |  | Vice President                          
|        |  |                           |  | 
|        |  |                           |  |  |  | BY:                                   |  | HARLEYSVILLE WORCESTER INSURANCE        
|        |  |                           |  |  |  |                                       |  | COMPANY, Limited Partner                
|        |  |                           |  | 
|Attest: |  |                           |  |  |  | BY:                                   |  |                                         
|        |  | David W. Galloway, III    |  |  |  |                                       |  | David K. Bond                           
|        |  | Assistant Secretary       |  |  |  |                                       |  | Vice President                          
|        |  |                           | 
|        |  |                           |  |  |  | Lessee:                              
|        |  |                           |  |  |  | HARLEYSVILLE MUTUAL INSURANCE COMPANY
|        |  |                           |  | 
|Attest: |  |                           |  |  |  | BY:                                   |  |                                         
|        |  | David W. Galloway, III    |  |  |  |                                       |  | Mark R. Cummins                         
|        |  | Vice President and        |  |  |  |                                       |  | Executive Vice President,               
|        |  | Associate General Counsel |  |  |  |                                       |  | Chief Investment Officer & Treasurer    



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