WSCRF Premium Nickel Resources Ltd (PK)

In vestment Objective

The Small-Cap ProFund (the “Fund”) seeks investment results, before fees and expenses, that correspond to the performance of the Russell 2000 ^® Index (the “Index”).

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when the Fund’s shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the example above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s annual portfolio turnover rate was 80% of the average value of its entire portfolio. This portfolio turnover rate is calculated without regard to cash instrument or derivatives transactions. If such transactions were included, the Fund’s portfolio turnover rate would be significantly higher.

ProFund Advisors uses a mathematical approach to investing. Using this approach, ProFund Advisors determines the type, quantity and mix of investment positions that the Fund should hold to approximate the performance of the Index. The Fund may gain exposure to only a representative sample of the securities in the Index, which exposure is intended to have aggregate characteristics similar to those of the Index, and may invest in securities or financial instrument not contained in the Index. ProFund Advisors does not invest the assets of the Fund in securities or financial instruments based on ProFund Advisors’ view of the investment merit of a particular security, instrument, or company, other than for cash management purposes, nor does it conduct conventional research or analysis (other than in determining counterparty creditworthiness), or forecast market movement or trends, in managing the assets of the Fund. The Fund seeks to remain fully invested at all times in securities and/or financial instruments that, in combination, provide exposure to the Index without regard to market conditions, trends or direction.

The Fund will concentrate its investments in a particular industry or group of industries to approximately the same extent as the Index is so concentrated.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

advantage of anticipated changes in market conditions, which could increase portfolio turnover and may result in additional costs for the Fund. In addition, large movements of assets into and out of the Fund may have a negative impact on the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses. In certain circumstances, the Fund’s expense ratio may vary from current estimates or the historical ratio disclosed in this Prospectus.

Correlation Risk  — A number of factors may affect the Fund’s ability to achieve a high degree of correlation with the Index, and there can be no guarantee that the Fund will achieve a high degree of correlation. Failure to achieve a high degree of correlation may prevent the Fund from achieving its investment objective. The factors that may adversely affect the Fund’s correlation with the Index include fees, expenses, transaction costs, financing costs associated with the use of derivatives, income items, valuation methodology, accounting standards and disruptions or illiquidity in the markets for the securities or financial instruments in which the Fund invests. The Fund may not have investment exposure to all securities in the Index, or its weighting of investment exposure to such securities may be different from that of the Index. In addition, the Fund may invest in securities or financial instruments not included in the Index. The Fund may also be subject to large movements of assets into and out of the Fund, potentially resulting in the Fund being over- or under-exposed to the Index. Activities surrounding Index reconstitutions or other Index rebalancing events may hinder the Fund’s ability to meet its investment objective.

Counterparty Risk  — The Fund will be subject to credit risk (i.e., the risk that a counterparty is unwilling or unable to make timely payments to meet its contractual obligations) with respect to the amount it expects to receive from counterparties to derivatives and repurchase agreements entered into by the Fund. If a counterparty becomes bankrupt or fails to perform its obligations, the value of your investment in the Fund may decline.

Early Close/Late Close/Trading Halt Risk  — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or derivatives. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses.

Equity and Market Risk  — The equity markets are volatile, and the value of securities, swaps, futures, options contracts and other instruments correlated with the equity markets may fluctuate dramatically from day-to-day. Equity markets are subject to political, regulatory, market and economic developments, as well as developments that impact specific economic sectors, industries or segments of the market. Volatility in the markets and/or market developments may cause the value of an investment in the Fund to decrease.

Liquidity Risk  — In certain circumstances, such as the disruption of the orderly markets for the securities or financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProFund Advisors. Markets for the securities in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, new legislation, or regulatory changes inside or outside

of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain securities would likely reduce the liquidity of those securities. Such situations may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Index.

Non-Diversification Risk  — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be. The risk may be particularly acute when the Index is comprised of a small number of securities.

Portfolio Turnover Risk  — The Fund’s strategy typically involves high portfolio turnover to manage the Fund’s investment exposure. Additionally, active trading of the Fund’s shares may cause more frequent purchase and sales activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of transactions increase brokerage costs and may result in increased taxable capital gains.

Small- and Mid-Cap Company Investment Risk  — The Index and, by extension, the Fund are exposed to the risks posed by stocks of small- and mid-cap companies. The risk of equity investing may be particularly acute for securities of issuers with smaller market capitalizations. Small- and mid-cap company stocks may trade at greater spreads or lower trading volumes, and may be less liquid than the stocks of larger companies. Small- and mid-cap companies may have limited product lines or resources, may be dependent upon a particular market niche and may have greater fluctuations in price than the stocks of larger companies. Further, stocks of small- and mid-sized companies could be more difficult to liquidate during market downturns compared to larger, more widely traded companies. In addition, small- and mid-cap companies may lack the financial and personnel resources to handle economic or industry-wide setbacks and, as a result, such setbacks could have a greater effect on small- and mid-cap security prices.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

Annual Returns of Investor Class Shares as of December 31 each year

Best Quarter (ended 6/30/2003): 21.69%;

Worst Quarter (ended 12/31/2008): -26.60%.

The year-to-date return as of the most recent quarter, which ended September 30, 2012, was 12.53% .

Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary. 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 the Fund’s shares through tax-deferred arrangements, such as a retirement account. After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.