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| SUMMARYPROSPECTUS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |
| RPMGX                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| May 1,2014                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |
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| T. Rowe Price

Mid-CapGrowth Fund                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| A fund seeking long-term capital appreciationthrough investments in stocks of mid-cap companies and a growth approach to stock selection.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Before you invest, you may want to review the fund’s prospectus,which contains more information about the fund and its risks. You can find the fund’s prospectusand other information about the fund online at troweprice.com/prospectus. You can also get this information at no cost by calling1-800-225-5132or by sending an e-mail request to info@troweprice.com. This Summary Prospectus incorporates by reference the fund’sprospectus, dated May 1, 2014, and Statement of Additional Information, dated May 1, 2014.

The Securities and Exchange Commission has not approved or disapproved these securitiesor passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense. |
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| Summary | 1      |

Investment Objective

The fund seeks to provide long-term capital appreciation by investingin mid-cap stocks with potential for above-average earnings growth.

Fees and Expenses

This table describes the feesand expenses that you may pay if you buy and hold shares of the fund. 

Fees and Expenses of the Fund

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|---------------------------------------------------------------------------------------------------------------|--------|
| Shareholder fees (fees paiddirectly from your investment)                                                     |
| Maximum sales charge (load) imposed on purchases                                                              | NONE   |
|                                                                                                          |   |
| Maximum deferred sales charge (load)                                                                          | NONE   |
|                                                                                                          |   |
| Redemption fee                                                                                                | NONE   |
|                                                                                                          |   |
| Maximum account fee                                                                                           | $20a   |
| Annual fund operating expenses(expenses that you pay each yearas apercentage of the value of your investment) |
| Management fees                                                                                               | 0.63%  |
|                                                                                                          |   |
| Distribution and service (12b-1) fees                                                                         | 0.00%  |
|                                                                                                          |   |
| Other expenses                                                                                                | 0.15%  |
|                                                                                                          |   |
| Total annualfund operating expenses                                                                           | 0.78%  |

a Subjectto certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.

Example  This example is intendedto help you 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 redeemall 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. Although your actual costsmay be higher or lower, based on these assumptions your costs would be:

|   |    |    |     |
|--------|---------|---------|----------|
| 1 year | 3 years | 5 years | 10 years |
| $80    | $249    | $433    | $966     |

Portfolio Turnover  The fundpays transaction costs, such as commissions, when it buys and sells securities (or “turns over”its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may resultin higher taxes when fund shares are held in a taxable account. These costs, which are not reflectedin annual fund operating expenses or in the example, affect the fund’s performance. During the mostrecent fiscal year, the fund’s portfolio turnover rate was 26.3% of the average value of its portfolio.

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| T.Rowe Price | 2      |

Investments, Risks, and Performance

Principal Investment Strategies  The fund will normally investat least 80% of its net assets (including any borrowings for investment purposes) in a diversified portfolioof common stocks of mid-cap companies whose earnings T. Rowe Price expects to grow at a faster ratethan the average company. The fund defines mid-cap companies as those whose market capitalization (numberof shares outstanding multiplied by share price) falls within the range of either the S&P MidCap400 Index or the Russell Midcap Growth Index. As of December 31, 2013, the market capitalizationranges for the S&P MidCap 400 Index and the Russell Midcap Growth Index were approximately $717.6million to $11.5 billion, and $441.7 million to $29.2 billion, respectively. The market capitalizationof the companies in the fund’s portfolio and the S&P and Russell indices changes over time;the fund will not automatically sell or cease to purchase stock of a company it holds just because thecompany’s market capitalization grows or falls outside these ranges.

As “growth” investors,T. Rowe Price believes that when a company’s earnings grow faster than both inflation and theoverall economy, the market will eventually reward it with a higher stock price.

In selecting investments, wegenerally favor companies with one or more of the following:

· proven productsor services;

· a record of above-average earnings growth;

· demonstratedpotential to sustain earnings growth;

· connection to an industry experiencing increasing demand;or

· stockprices that appear to undervalue their growth prospects.

In pursuing its investment objective, the fundhas the discretion to deviate from its normal investment criteria, as previously described, and purchasesecurities that the fund’s management believes will provide an opportunity for substantial appreciation.These situations might arise when the fund’s management believes a security could increase in valuefor a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation,a favorable competitive development, or a change in management.

While most assets will typically be investedin U.S. common stocks, the fund may invest in foreign stocks in keeping with the fund’s objectives.

Thefund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeployassets into more promising opportunities.

PrincipalRisks  As with any mutual fund, there is no guarantee that the fund will achieve its objective.The fund’s share price fluctuates, which means you could lose money by investing in the fund. Theprincipal risks of investing in this fund are summarized as follows:

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| Summary | 3      |

Active management riskThe fund is subject to the risk that the investment adviser’sjudgments about the attractiveness, value, or potential appreciation of the fund’s investments mayprove to be incorrect. If the securities selected and strategies employed by the fund fail to producethe intended results, the fund could underperform other funds with similar objectives and investmentstrategies.

Risks of stockinvesting  Stocks generally fluctuate in value more than bonds and may decline significantly overshort time periods. There is a chance that stock prices overall will decline because stock markets tendto move in cycles, with periods of rising prices and falling prices. The value of a stock in which thefund invests may decline due to general weakness in the stock market or because of factors that affecta company or a particular industry. 

Marketcapitalization risk  Investing primarily in issuers within the same market capitalization categorycarries the risk that the category may be out of favor due to current market conditions or investor sentiment.Because the fund invests primarily in securities issued by mid-cap companies, it is likely to be morevolatile than a fund that focuses on securities issued by large companies. Medium-sized companies typicallyhave less seasoned management, narrower product lines, and less capital reserves and liquidity than largercompanies, and are therefore more sensitive to economic, market, and industry changes.

Investment style risk  Different investment styles tend toshift in and out of favor, depending on market conditions and investor sentiment. The fund’s growthapproach to investing could cause it to underperform other stock funds that employ a different investmentstyle. Growth stocks tend to be more volatile than certain other types of stocks and their prices usuallyfluctuate more dramatically than the overall stock market. A stock with growth characteristics can havesharp price declines due to decreases in current or expected earnings and may lack dividends that canhelp cushion its share price in a declining market.

Foreign investing risk  This is the risk that the fund’s investments inforeign securities may be adversely affected by political, social, and economic conditions overseas,reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.

Performance  The bar chart showing calendar year returns andthe average annual total returns table indicate risk by illustrating how much returns can differ fromone year to the next and how fund performance compares with that of a comparable market index. The fund’spast performance (before and after taxes) is not necessarily an indication of future performance.

Thefund can also experience short-term performance swings, as shown by the best and worst calendar quarterreturns during the years depicted.

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| T.Rowe Price | 4      |

In addition, the average annualtotal returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder mayinfluence returns. After-tax returns are calculated using the historical highest individual federal marginalincome tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns dependon an investor’s tax situation and may differ from those shown. After-tax returns shown are notrelevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k)account or individual retirement account.

|                        |                                                                             |                                 |              |   |        |          |        |        |           |   |   |   |
|-----------------------------|----------------------------------------------------------------------------------|--------------------------------------|-------------------|--------|-------------|---------------|-------------|-------------|----------------|--------|--------|--------|
| AverageAnnual Total Returns |                                                                             |                                 |              |   |        |          |        |        |           |   |
|                        |                                                                             |                                 | Periodsended      |   |
|                        |                                                                             |                                 | December 31, 2013 |   |
|                        |                                                                             |                                 | 1 Year       |   |        | 5 Years  |        |        | 10 Years  |   |   |   |
|                        | Mid-Cap Growth Fund                                                              |                                 |              |   |        |          |        |        |           |   |   |
|                        |                                                                             | Returns before taxes                 | 36.89        | %      | 23.47  | %             | 11.45  | %           |           |
|                        |                                                                             | Returns after taxes on distributions | 34.98        |   |        | 22.37    |        |        | 10.43     |   |   |   |
|                        |                                                                             | Returns after taxes on distributions |              |   |        |          |        |        |           |   |   |   |
|                        |                                                                             | and sale of fund shares              | 22.34        |   |        | 19.39    |        |        | 9.45      |   |   |   |
|                        | Russell Midcap Growth Index (reflects no deduction for fees, expenses,or taxes)a | 35.74                           |              |   | 23.37  |          |        | 9.77   |           |   |   |
|                        | S&PMidCap 400 Index (reflects no deduction for fees, expenses, or taxes)     | 33.50                           |              |   | 21.89  |          |        | 10.36  |           |   |   |
|                        | LipperMid-Cap Growth Funds Index                                                 | 36.52                           |              |   | 21.31  |          |        | 9.49   |           |   |   |

a EffectiveOctober 1, 2013, the fund’s primary benchmark for performance comparison purposes was changed fromthe S&P MidCap 400 Index to the Russell MidCap Growth Index. The new primary benchmark better reflectsthe performance of the fund’s growth-oriented investment universe.

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| Summary | 5      |

Updated performanceinformation is available through troweprice.com or may be obtained by calling 1-800-225-5132.

Management

Investment Adviser  T. RowePrice Associates, Inc. (T. Rowe Price)

|                |                                        |               |                      |
|---------------------|---------------------------------------------|--------------------|---------------------------|
| PortfolioManager    | Title                                       | Managed Fund Since | Joined Investment Adviser |
| Brian W.H. Berghuis | Chairman of Investment

 Advisory Committee | 1992               | 1985                      |

Purchaseand Sale of Fund Shares

Subject to certain exceptions, the fund is currently closed to new investors and newaccounts. Investors who currently hold shares of the fund may continue to purchase additional shares.

Thefund’s investment minimums generally are as follows (if you hold shares through a financial intermediary,the intermediary may impose different investment minimums):

|                                                                                                                                                |                    |                      |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------|---------------------------|
| Typeof Account                                                                                                                                      | Minimuminitial purchase | Minimumsubsequentpurchase |
| Individual retirement accounts, small business retirement planaccounts, and Uniform Gifts to Minors Act or Uniform Transfers to Minors Act accounts | $1,000                  | $100                      |
|                                                                                                                                                |                    |                      |
| All otheraccounts                                                                                                                                   |   2,500       |    100     |

You may purchase, redeem, orexchange shares of the fund on any day the New York Stock Exchange is open for business by accessingyour account online at troweprice.com, by calling 1-800-225-5132, or by written request. If you holdshares through a financial intermediary, you must purchase, redeem, and exchange shares through yourintermediary.

Tax Information

Any dividends or capital gains are declared andpaid annually, usually in December. Distributions by the fund, whether or not you reinvest these amountsin additional fund shares, may be taxed as ordinary income or capital gains unless you invest througha tax-deferred account. A redemption or exchange of fund shares may be taxable. 

Paymentsto Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the fund through abroker-dealer or other financial intermediary (such as a bank), the fund and its related companies maypay the intermediary for the sale of fund shares and related services. These payments may create a conflictof interest by influencing the broker-dealer or other intermediary 

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| T.Rowe Price | 6      |

and your salesperson to recommend the fund over another investment.Ask your salesperson or visit your financial intermediary’s website for more information.

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| T. Rowe PriceAssociates, Inc.100 East Pratt StreetBaltimore, MD 21202 | F64-0455/1/14 |