Exhibit 1 AGREEMENT AND PLAN OF REORGANIZATION AGREEMENT AND PLAN OF REORGANIZATION BETWEEN FEDERATED INDEX TRUST, WITH RESPECT TO FEDERATED MID-CAP INDEX FUND AND THE MASON STREET FUNDS, INC., WITH RESPECT TO THE MASON STREET INDEX 400 STOCK FUND...Agreement and Plan of Reorganization • December 22nd, 2005 • Federated Index Trust • Pennsylvania
