0000887991ici:Registrant_item2007-12-050000887991filer:S0000046272007-12-050000887991filer:C0000125972007-12-050000887991filer:C0000125982007-12-050000887991filer:C0000125992007-12-050000887991filer:C0000126002007-12-050000887991filer:C0000126012007-12-050000887991filer:AllInstruments2007-12-050000887991filer:group_S000004627C0000126012007-12-050000887991filer:group_C000012597C000012598C000012599C000012600C0000126012007-12-050000887991filer:group_C000012597C000012598C000012599C0000126002007-12-05pureiso4217:USDRISK/RETURN SUMMARYABOUT THE FUNDThis section highlights key information about Dryden Stock Index Fund, which we refer to as the Fund. The Fund is currently the only series of Dryden Index Series Fund. Additional information follows this summary.INVESTMENT OBJECTIVE AND PRINCIPAL STRATEGIESOur investment objective is to provide investment results that correspond to the price and yield performance of the Standard & Poor's 500 Composite Stock Price Index (S&P 500 Index). The Fund intends under normal circumstances to invest over 80% of its investable assets in securities included in the S&P 500 Index in approximately the same proportions as those of the Index. The term "investable assets" in this prospectus refers to the Fund's net assets plus any borrowings for investment purposes. The Fund's investable assets will be less than its total assets to the extent that it has borrowed money for non-investment purposes, such as to meet anticipated redemptions.Did You Know...The Fund employs a "passively managed"--or index--investment approach. We aim to hold the same mix of stocks as is held in the S&P 500 Index. The S&P 500 Index is an unmanaged, market-weighted index of 500 stocks selected by Standard & Poor's Corporation (S&P) on the basis of their market size, liquidity and industry group representation. The S&P 500 Index is composed of stocks representing more than 75% of the total market value of all publicly traded U.S. common stocks and is widely regarded as representative of the performance of the U.S. stock market as a whole.The Fund tries to achieve a correlation between its performance and the performance of the S&P 500 Index of at least 0.95, with or without taking expenses into account. We sell a security within a reasonable time after it has been removed from the Index. The Fund may use derivatives. The Fund will provide 60 days' prior written notice to shareholders of a change in its non-fundamental policy of investing at least 80% of its investable assets in securities included in the S&P 500 Index.While we make every effort to achieve our objective, we can't guarantee success.PRINCIPAL RISKSAlthough we try to invest wisely, all investments involve risk. The Fund's performance will not precisely correspond to the performance of the S&P 500 Index. Potential tracking differences, brokerage and other costs and other Fund expenses may cause the Fund's return to be lower than that of the S&P 500 Index.Since the Fund invests primarily in common stock, there is the risk that the price of a particular stock we own could go down, or the value of the equity markets or a sector of them could go down. Stock markets are volatile. Generally, the stock prices of large and medium-sized companies are more stable than the stock prices of small companies.Some of our investment strategies may present above-average risks. The Fund may use risk management techniques to try to preserve assets. We may use hedging techniques to try to enhance return. Derivatives may not fully offset the underlying positions and this could result in losses to the Fund that would not otherwise have occurred.Like any mutual fund, an investment in the Fund could lose value and you could lose money. For more detailed information about the risks associated with the Fund, see "How the Fund Invests--Investment Risks."An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.Foreign Securities Risk. Foreign political, economic and legal systems may be less stable than in the U.S. The changing value of foreign currencies could also affect the value of the assets we hold and our performance.Derivatives Risk. The value of certain derivatives that are used to manage cash flows or to hedge a portfolio security are generally determined independently from that security and could result in a loss to the Fund when the price movement of a derivative used as a hedge does not correlate with a change in the value of the portfolio security. Investments in derivatives may not have the intended effects and may result in losses or missed opportunities and counterparties could default.Market Risk. There is a possibility that the market value of an investment may move up or down and that its movement may occur quickly or unpredictably. Securities markets are volatile.Equity Securities Risk. Since the Fund's investments are primarily in common stock, there is the risk that the price of a particular stock we own could go down. Stock markets are volatile. In addition to an individual stock losing value, the value of the equity markets or a sector of them could go down. The Fund's holdings can vary from broad market indexes, and performance of the Fund can deviate from the performance of such indexes.Fixed-Income Obligations Risk. In addition to credit risk, market risk and interest rate risk, the Fund's holdings, share price, yield and total return may fluctuate in response to bond market movements.EVALUATING PERFORMANCEA number of factors - including risk - can affect how the Fund performs. The following bar chart shows the Fund's performance for each full calendar year of operations or for the last 10 calendar years, whichever is shorter. The following bar chart and Average Annual Total Returns table demonstrate the risk of investing in the Fund by showing how returns can change from year to year and by showing how the Fund's average annual total returns compare with a broad-based securities market index and a group of similar mutual funds.Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future.Annual Total Returns % (Class Z Shares)119970.322819980.283319990.2052000-0.08962001-0.12172002-0.223320030.281820040.105120050.045320060.15511Total Return for Class Z shares from 1-1-07 to 9-30-07 was 8.93%BEST QUARTER:WORST QUARTER:0.2133(4th quarter of 1998)-0.1729(3rd quarter of 2002)Average Annual Total Returns % (as of 12-31-06)Return Before TaxesOne YearFive YearsTen YearsSince InceptionClass A shares0.11420.0489Class B shares0.0930.0463Class C shares0.1330.0479Class I shares0.15510.0593Class Z Shares %Return Before Taxes0.15510.05840.0808Return After Taxes on Distributions0.1520.05550.0763Return After Taxes on Distributions and Sale of Fund Shares0.10490.04950.0692Index (reflects no deduction for fees, expenses or taxes)S&P 500 Index0.15780.06180.0842Lipper Average0.15190.0560.0795?The Fund's returns are after deduction of sales charges and expenses. Without the distribution and service (12b-1) fee waiver for Class A shares, the returns would have been lower. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class Z shares. After-tax returns for other classes will vary due to differing sales charges and expenses. Past performance, before and after taxes, does not mean that the Fund will achieve similar results in the future. The Standard & Poor's 500 Composite Stock Price Index (S&P 500) - an unmanaged index of 500 stocks of large U.S. companies - gives a broad look at how stock prices in the U.S. have performed. These returns do not include the effect of any sales charges or operating expenses of a mutual fund. These returns would be lower if they included the effect of sales charges and operating expenses. S&P 500 Index returns since the inception of the Fund's Class A, Class B, and Class C shares are 1.93% . S&P 500 Index returns since the inception of the Fund's Class I shares are 5.95%. The Lipper Average is based on the average return of all mutual funds in the Lipper EQ S&P 500 Index Objective Fund category and does not include the effect of any sales charges. Lipper returns since the inception of the Fund's Class A, Class B, and Class C shares are 1.41% . Lipper returns since the inception of the Fund's Class I shares are 5.52%. Source: Lipper Inc. Inception date for Class A, B, & C is 11-18-99. Inception date for Class I shares is 8-1-97.FEES AND EXPENSESThis table shows the sales charges, fees and expenses that you may pay if you buy and hold shares of each share class of the Fund. Each share class has different (or no) sales charges - known as loads - and expenses, but represents an investment in the same Fund. For more information about which share class may be right for you, see "How to Buy, Sell and Exchange Shares of the Fund."Shareholder Fees (paid directly from your investment)Class AClass BClass CClass IClass ZMaximum sales charge (load) imposed on purchases (as a percentage of offering price)0.03250.00000.00000.00000.0000Maximum deferred sales charge (load) (as a percentage of the lower of original purchase price or sale proceeds)0.01000.05000.01000.00000.0000Maximum sales charge (load) imposed on reinvested dividends and other distributions0.00000.00000.00000.00000.0000Redemption fees00000Exchange fee00000Small balance account fee15151500Annual Fund Operating Expenses (deducted from Fund assets)Class AClass BClass CClass IClass ZManagement fees0.00080.00080.00080.00080.0008+ Distribution and service (12b-1) fees0.00300.01000.01000.00000.0000+ Transfer agent fees0.00100.00220.00170.00070.0013+ Other expenses0.00030.00030.00030.00030.0003= Total annual Fund operating expenses0.00510.01330.01280.00180.0024- Fee waiver-0.0002(a)0.00000.00000.00000.0000= Net annual Fund operating expenses0.00490.01330.01280.00180.0024(a)The 0.02% waiver applicable to Class A shares was calculated based on a combination of 4 months waiver at 0.05% (10-1-07 to 1-31-08) and 8 months at zero. Effective February 1, 2008, the contractual fee waiver applicable to Class A shares will terminate.EXAMPLESThis example is intended to help you compare the fees and expenses of the Fund's different share classes and compare the cost of investing in the Fund with the cost of investing in other mutual funds.The example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, except for the Distributor's reduction of distribution and service (12b-1) fees for Class A shares and the contractual management fee waiver, which are effective in this example for only the first year. Approximately seven years after purchase, Class B shares will automatically convert to Class A shares on a quarterly basis. The information in the ten years column reflects this conversion.Example (Redemption)One YearThree YearsFive YearsTen YearsClass A shares373481599943Class B shares6357218291270Class C shares2304067021545Class I shares1858101230Class Z shares2577135306You would pay the following expenses on the same investment if you did not sell your shares:Example (No Redemption)One YearThree YearsFive YearsTen YearsClass A shares373481599943Class B shares1354217291270Class C shares1304067021545Class I shares1858101230Class Z shares2577135306?Your broker may charge you a separate or additional fee for purchases and sales of shares. If the value of your account is less than $2,500, the Fund will deduct a $15 annual small balance account fee from your account. The small balance account fee will also be charged on accounts invested in Class L, M or X shares, if applicable, (these share classes are currently not offered for sale). The $15 annual small balance account fee will be assessed during the 4th calendar quarter of each year. Any applicable CDSC on the shares redeemed to pay the $15 small balance account fee will be waived. The $15 small balance account fee will not be charged on: (i) accounts during the first six months from inception of the account, (ii) omnibus accounts, (iii) institutional accounts, (iv) group retirement plans, and (v) Automatic Investment Plan ("AIP") accounts or employee savings plan accounts. For more information, see "Purchase, Redemption and Pricing of Fund Shares ? Small Balance Account Fee" in the Statement of Additional Information. Investors who purchase $1 million or more of Class A shares are not subject to an initial sales charge but are subject to a contingent deferred sales charge (CDSC) of 1% for shares redeemed within 12 months of purchase. The CDSC is waived for purchases by certain retirement or benefit plans. The CDSC for Class B shares decreases by 1% annually to 1% in the fifth and sixth years and 0% in the seventh year. Class B shares automatically convert to Class A shares approximately seven years after purchase. The CDSC for Class C shares is 1% for shares redeemed within 12 months of purchase. For the period ending January 31, 2008, the Distributor of the Fund has contractually agreed to reduce its distribution and service (12b-1) fees for Class A shares to .25 of 1% of the average daily net assets of Class A shares. After January 31, 2008, the distribution and service (12b-1) fee applicable to Class A shares will be .30 of 1%. Management Fees: Effective June 1, 2007 to January 31, 2009, the Fund's manager has agreed to contractually waive a portion of its management fee so that the effective management fee for the Fund will be .08 of 1% of the average daily net assets of the Fund. Accordingly, management fee disclosed is 0.08%. The Fund's management fee schedule includes fee breakpoints which reduce the Fund's effective management fee as Fund average net assets increase. Had the current contractual fee waiver not been in effect, changes in Fund assets may result in increases or decreases in the Fund's effective management fee. The Fund's management fee schedule is set forth below: .30% to $1 billion; and .25% over $1 billion.2007-12-052007-12-05The purpose of submitting the tagged exhibit is to test the related format and technology and, as a result, investors should not rely on this exhibit in making investment decisions.