INSTITUTIONAL LARGE INDEX ACCOUNT

Following is a summary of information about the Sentry Institutional Large Index Account. Investors are advised to learn key data about an investment prior to making any investment decision.

Objective

The objective of the Institutional Large Index Account is to seek to replicate the aggregate price and yield performance, before expenses, of the S&P 500 Index. It invests solely in the Vanguard® Institutional Index Fund.

Investor Profile

The Institutional Large Index Account may be suitable for investors with a long-term investment horizon who are seeking long-term growth of capital and income from dividends by participating in the large capitalization sector of the stock market. Individuals must be willing and able to accept considerable changes in unit price both in the short and long-term.

Investment Strategy

The Vanguard Institutional Index Fund invests in all 500 stocks listed in the S&P 500 index in approximately the same proportion as they are represented in the index. The correlation between the performance of the fund and that of the index is expected to be 0.95 or higher. The unmanaged Standard & Poor’s 500 Composite Stock Price Index is a widely recognized benchmark of the U.S. stock market performance. The fund remains fully invested at all times and does not speculate on the direction of the index. To assure a fully invested position given daily cash flows into and out of the fund, the advisor normally holds up to 5 percent of the fund’s net assets in S&P 500 futures contracts.

Investment Considerations

The Institutional Large Index Account takes a passive/index, unmanaged approach to investing in 500 of the largest U.S. companies. This account is appropriately used by investors seeking exposure to 500 of the largest U.S. company stocks for part or all of their retirement portfolio.

PORTFOLIO DATA

Asset Allocation (as of 06-30-2008)     Stocks 100.00%   Key Facts (as of 06-30-2008)     Number of Stocks 507 Price/Earnings Ratio 16.2x Turnover Rate (Fiscal Year End December) 7.0% Beta 3 year trailing (vs. S&P 500 Index) 1.0 Standard Deviation as of 12-31-2007 16.43%   Top Ten Stock Holdings (as of 06-30-2008) Concentration   Range   Exxon Mobil Corp. 0 %     General Electric Co. 0 %     Microsoft Corp. 0 %     Chevron Corp. 0 %     AT&T Inc. 0 %     Procter & Gamble Co. 0 %     Johnson & Johnson 0 %     International Business Machines Corp. 0 %     Apple Computer, Inc. 0 %     ConocoPhillips Co. 0 %     Top Ten Equals 19.6% of Portfolio   Top Sectors (as of 06-30-2008)       Information Technology 16.50 % Energy 16.20 % Financials 14.20 % Health Care 11.90 % Industrials 11.10 % Consumer Staples 10.80 % Consumer Discretionary 8.10 % Utilities 4.00 % Materials 3.90 % Telecommunication Services 3.30 % Total % of Portfolio 100.00 % Vanguard Institutional Index Fund* Average Annual Returns Annual Total Returns (as of 08-31-2008) (as of 12-31)           1 Month 1.45%     3 Months (7.87)%     YTD (11.39)%     1 year (11.15)%     3 years 3.65%     5 years 6.91%     10 years 4.72%                                     1994       1.31%     1995       37.60%     1996       23.06%     1997       33.36%     1998       28.79%     1999       21.17%     2000       (8.95)%     2001       (11.93)%     2002       (22.03)%     2003       28.66%     2004       10.86%     2005       4.91%     2006       15.78%     2007       5.47%