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T. Rowe Price New Horizons Fund, Inc.

T. ROWE PRICE New Horizons Fund Investor Class I Class Z Class SUMMARY

Investment Objective(s)

The fund seeks long-term capital growth by investing primarily in common stocks of small, rapidly growing companies.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the Investor Class or I Class, which are not reflected in the table.

Fees and Expenses of the Fund Shareholder fees (fees paid directly from your investment)

Shareholder Fees - T. Rowe Price New Horizons Fund, Inc. - USD ($)	Investor Class		I Class	Z Class
Maximum account fee	$ 20	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - T. Rowe Price New Horizons Fund, Inc.	Investor Class	I Class	Z Class
Management fees	0.64%	0.64%	0.64%
Distribution and service (12b-1) fees
Other expenses	0.12%	0.01%	0.01%
Total annual fund operating expenses	0.76%	0.65%	0.65%
Fee waiver/expense reimbursement			(0.65%)	[1]
Total annual fund operating expenses after fee waiver/expense reimbursement	0.76%	0.65%	none	[1]

Example

This example is intended to 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 redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. The example also assumes that any current expense limitation arrangement remains in place for the period noted in the table above; therefore, the figures have been adjusted to reflect fee waivers or expense reimbursements only in the periods for which the expense limitation arrangement is expected to continue. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - T. Rowe Price New Horizons Fund, Inc. - USD ($)	1 year	3 years	5 years	10 years
Investor Class	78	243	422	954
I Class	66	208	362	810
Z Class	none	none	none	none

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 rate 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, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 45.8% of the average value of its portfolio.

Investments, Risks, and Performance Principal Investment Strategies

The fund invests primarily in a diversified group of small, emerging growth companies, preferably early in their corporate life cycle before the companies become widely recognized by the investment community. The fund may also invest in companies that offer the possibility of accelerating earnings growth because of rejuvenated management, new products, or structural changes in the economy. The portfolio manager will not necessarily sell a position in a company that has grown beyond the developing stage if the company still fits the fund’s other investment criteria.

When choosing stocks for the fund’s portfolio, T. Rowe Price analysts tend to look for small growth companies that exhibit some or all of the following characteristics:

• effective management;

• operate in fertile growth areas;

• demonstrate innovative research, product development, and marketing;

• provide efficient service;

• possess pricing flexibility; and

• employ sound financial and accounting policies.

In pursuing its investment objective(s), the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the adviser believes a security could increase in value for a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation, a favorable competitive development, or a change in management.

The fund’s investments may include holdings in privately held companies and companies that only recently began to trade publicly. The fund may at times invest significantly in securities issued by technology companies. While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with its objective(s).

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

As with any fund, there is no guarantee that the fund will achieve its objective(s). The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund, which may be even greater during periods of market disruption or volatility, are summarized as follows.

Small-cap stocks Investments in securities issued by small-cap companies are likely to be more volatile than investments in securities issued by larger companies. Small-cap companies often have less experienced management, narrower product lines, more limited financial resources, and less publicly available information than larger companies. In addition, smaller companies are typically more sensitive to changes in overall economic conditions and their securities may be difficult to trade.

Private placements and IPOs Investments in the stocks of privately held companies and in companies that only recently begun to publicly trade involve greater risks than investments in stocks of companies that have traded publicly on an exchange for extended time periods. There is significantly less information available about these companies’ business models, quality of management, earnings growth potential, and other criteria that are normally considered when evaluating the investment prospects of a company. Private placements and other restricted securities held by the fund are typically considered to be illiquid and tend to be difficult to value since there are no market prices and less overall financial information available. The adviser evaluates a variety of factors when assigning a value to these holdings, but the determination involves some degree of subjectivity and the value assigned for the fund may differ from the value assigned by other mutual funds holding the same security.

Growth investing The fund’s growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices may fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Sector exposure At times, the fund may have a significant portion of its assets invested in securities of issuers conducting business in a broadly related group of industries within the same economic sector. Issuers in the same economic sector may be similarly affected by economic or market events, making the fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Investments in the financials sector are susceptible to adverse developments relating to regulatory changes, interest rate movements, the availability of capital and cost to borrow, and the rate of debt defaults.

Foreign investing Investments in the securities of non-U.S. issuers may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. The risks of investing outside the U.S. are heightened for any investments in emerging markets, which are susceptible to greater volatility than investments in developed markets.

Stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of stocks held by the fund may decline due to general weakness or volatility in the stock markets in which the fund invests or because of factors that affect a particular company or industry.

Active management The fund’s overall investment program and holdings selected by the fund’s investment adviser may underperform the broad markets, relevant indices, or other funds with similar objectives and investment strategies.

Performance

The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.

NEW HORIZONS FUND Calendar Year Returns

	Quarter Ended	Total Return		Quarter Ended	Total Return
Best Quarter	3/31/19	20.77%	Worst Quarter	12/31/18	-17.04%

The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. 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 a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.

Average Annual Total Returns Periods ended December 31, 2019

Average Annual Total Returns - T. Rowe Price New Horizons Fund, Inc.	1 Year	5 Years	10 Years	Since inception		Inception date
Investor Class	37.71%	16.24%	18.80%			Jun. 03, 1960
Investor Class | Returns after taxes on distributions	34.23%	13.76%	16.58%			Jun. 03, 1960
Investor Class | Returns after taxes on distributions and sale of fund shares	24.75%	12.50%	15.40%			Jun. 03, 1960
I Class	37.85%			17.88%		Aug. 28, 2015
Z Class						Mar. 16, 2020
Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)	28.48%	9.34%	13.01%	10.39%	[1]	Aug. 28, 2015
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)	31.49%	11.70%	13.56%	14.14%	[1]	Aug. 28, 2015
Lipper Mid-Cap Growth Funds Index	33.83%	11.33%	13.02%	12.86%	[1]	Aug. 28, 2015

Updated performance information is available through troweprice.com.

[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.

[1] T. Rowe Price Associates, Inc., has contractually agreed to waive and/or bear all of the Z Class’ expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary expenses; and acquired fund fees and expenses) in their entirety. T. Rowe Price Associates, Inc. expects this fee waiver and/or expense reimbursement arrangement to remain in place indefinitely, and the agreement may only be amended or terminated with approval by the fund’s Board of Directors.

[1] Return since 8/28/15.