Summary Prospectus by Investment Company (Form 497K)

Baron Discovery Fund

Investment Goal

The investment goal of Baron Discovery Fund^® (the "Fund") is capital appreciation through investments primarily in securities of small-sized growth companies.

Fees and Expenses of the Fund

The table below describes the fees and expenses that you would pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.

Annual Fund Operating Expenses

(Expenses that you pay each year as a percentage of the value of your investment)

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. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, giving effect to the expense reimbursement agreement described above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

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

Baron Discovery Fund

may indicate higher transaction costs and may result in higher taxes for Fund shareholders. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the example, affect the Fund's performance. During the most recent fiscal year ended September 30, 2025, the Fund's portfolio turnover rate was 41% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies of the Fund

The Fund is a diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. small-sized growth companies. The Adviser defines small-sized companies as those, at the time of purchase, with market capitalizations up to the largest market cap stock in the Russell 2000 Growth Index at reconstitution, or companies with market capitalizations up to $2.5 billion, whichever is larger. The Adviser seeks to invest in businesses it believes have significant opportunities for growth, sustainable competitive advantages, exceptional management, and an attractive valuation. Because of its long-term approach, the Fund could have a significant percentage of its assets invested in securities that have appreciated beyond their market capitalizations at the time of the Fund's investment.

Principal Risks of Investing in the Fund

General Stock Market. Fund losses may be incurred due to declines in one or more markets in which Fund investments are made. These declines may be the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s). In addition, turbulence as has recently been experienced, caused, among other reasons, by increased inflation, tightening monetary policy and interest rate increases by the US Federal Reserve or similar international bodies, and reduced liquidity in financial markets may continue to negatively affect many issuers, which could have an adverse effect on your Fund investment. Events involving limited liquidity, defaults, non-performance or other adverse developments that affect one industry, such as the financial services industry, or concerns or rumors about any events of these kinds, have in the past and may in the future lead to market-wide liquidity problems, may spread to other industries, and could negatively affect the value and liquidity of the Fund's investments. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market, such as Russia's invasion of Ukraine in February 2022 and the world-wide response to it, have and may continue to adversely impact issuers and markets worldwide. Increasingly strained relations between countries, including between the U.S. and traditional allies and/or adversaries, could adversely affect U.S. issuers as well as non-U.S. issuers that rely on the United States for trade. A fund's securities may be negatively impacted by inflation (or expectations for inflation), interest rates, global demand for particular products/services or resources, supply chain disruptions, natural disasters,

Baron Discovery Fund

pandemics, epidemics, terrorism, war, military confrontations, changes in trade regulations, elevated levels of government debt, internal unrest and discord, economic sanctions, regulatory events and governmental or quasi-governmental actions, among others. For example, the well-publicized conflicts in the Middle East and in the Southern hemisphere present considerable market risks, and the ultimate effects of these events and other socio-political or geopolitical issues are not known but could profoundly affect global economies and markets. Raising the ceiling on U.S. government debt has become increasingly politicized. Any failure to increase the total amount that the U.S. government is authorized to borrow could lead to a default on U.S. government obligations, with unpredictable consequences for economies and markets in the U.S. and elsewhere.

Growth Investing. Growth stocks can react differently to issuer, political, market and economic developments than the market as a whole and other types of stocks. Growth stocks tend to be more expensive relative to their earnings or assets compared to other types of stocks. As a result, because growth stocks tend to be sensitive to changes in their earnings and to increasing interest rates and inflation, they tend to be more volatile than other types of stocks. In response, from time to time, growth investing as an investment style may go out of favor with investors.

Small-Sized Companies. The Adviser believes there is more potential for capital appreciation in small-sized companies, but there also may be more risk. Securities of small-sized companies may not be well known to most investors, and the securities may be less actively traded than those of large businesses. The securities of small-sized companies may fluctuate in price more widely than the stock market generally, and they may be more difficult to sell during market downturns. Small-sized companies rely more on the skills of management and on their continued tenure. Investing in small-sized companies requires a long-term outlook and may require shareholders to assume more risk and to have more patience than investing in the securities of larger, more established companies.

Special Situations. The Funds may invest in "special situations." A special situation arises when, in the opinion of the Adviser, the securities of a company will be recognized and appreciate in value due to a specific anticipated development at that company. Such developments might include a new product, a management change, an acquisition or a technological advancement. The risk of investing in special situations is that the anticipated development does not occur or its impact is not what the Adviser expected.

Technology. Technology companies, including internet-related and information technology companies, as well as companies propelled by new technologies, may present the risk of rapid change and product obsolescence, and their successes may be difficult to predict for the long term. Some technology companies may be newly formed and have limited operating history and experience. Technology companies may also be adversely affected by changes in governmental policies, competitive pressures and changing demand. The securities of these companies may also experience significant price

Baron Discovery Fund

movements caused by disproportionate investor optimism or pessimism, with little or no basis in the companies' fundamentals or economic conditions.

Industrials Sector. The Fund's investments are exposed to issuers conducting business in the Industrials Sector. The Industrials Sector includes manufacturers and distributors of capital goods such as aerospace and defense, building projects, electrical equipment and machinery and companies that offer construction and engineering services. It also includes providers of commercial and professional services including printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, research and consulting services. It also includes companies that provide transportation services. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Industrials Sector. The prices of the securities of companies operating in the Industrials Sector may fluctuate due to the level and volatility of commodity prices, the exchange value of the dollar, import controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control devices.

Health Care Sector Risk. Investments in health care companies are subject to a number of risks, including the adverse impact of legislative actions and government regulations. These actions and regulations can affect the approval process for patents, medical devices and drugs, the funding of research and medical care programs, and the operation and licensing of facilities and personnel. Biotechnology and related companies are affected by patent considerations, intense competition, rapid technology change and obsolescence, and regulatory requirements of various federal and state agencies. In addition, some of these companies are relatively small and have thinly traded securities, may not yet offer products or may offer a single product, and may have persistent losses during a new product's transition from development to production, or erratic revenue patterns. The stock prices of these companies are very volatile, particularly when their products are up for regulatory approval and/or under regulatory scrutiny.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund (Retail Shares) by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years and since inception compare with a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at BaronCapitalGroup.com/daily-prices-and-performance or by calling 1-800-99BARON (1-800-992-2766).

Baron Discovery Fund

Year by Year Total Return (%) as of December 31 of Each Year (Retail Shares)

Average Annual Total Returns (for periods ended 12/31/25)

The following table shows the Fund's Retail Shares' annual returns and long-term performance (before and after taxes) and the change in value of market indexes over various periods ended December 31, 2025. This table shows how the Fund's performance compares to that of the Russell 2000® Growth Index, which measures the performance of the small-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000 Index, a broad-based securities index which is comprised of the 3,000 largest U.S. companies as determined by total market capitalization. The table also shows the average annual returns of the Fund's Institutional Shares and R6 Shares, but it does not show after-tax returns.

After-tax returns are calculated using the highest individual federal marginal income tax rate in effect at the time of each distribution and assumed sale, but they do not include the impact of state and local taxes.

Your actual after-tax returns depend on your own tax situation and may differ from those shown. After-tax returns reflect past tax effects and are not predictive of future tax effects. After-tax returns are not relevant to investors who hold their Fund's shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.

Baron Discovery Fund

Average Annual Total Returns for the periods ended December 31, 2025

Management

Investment Adviser. BAMCO is the investment adviser of the Fund.

Portfolio Managers. Laird Bieger and Randolph Gwirtzman have been the co-managers of Baron Discovery Fund since its inception on September 30, 2013. Mr. Bieger and Mr. Gwirtzman joined the Adviser as research analysts in May of 2000 and September of 2002, respectively.

Baron Discovery Fund

Purchase and Sale of Fund Shares

Shares may be purchased only on days that the New York Stock Exchange is open for trading.

Baron Discovery Fund

You Can Purchase or Redeem Shares By:

The Fund is not for short-term traders who intend to purchase and then sell their Fund shares within a 90 day period. If the Adviser reasonably believes that a person is not a long-term investor, it will attempt to prohibit that person from making additional investments in the Fund.

Tax Information

Distributions of the Fund's net investment income (other than "qualified dividend income") and distributions of net short-term capital gains will be taxable to you as ordinary income. Distributions of the Fund's net long-term capital gains reported as capital gain dividends by the Fund will be taxable to you as long-term capital gains, regardless of the length of time you have held shares of the Fund. If you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement

Baron Discovery Fund

account, you may be subject to federal income tax on withdrawals from tax-deferred arrangement at a later date.

Financial Intermediary Compensation

If you purchase Retail or Institutional Shares of the Fund through a broker, dealer or other financial intermediary (such as a bank or financial adviser), the Fund, Baron Capital, Inc., the Fund's distributor, BAMCO or their affiliates may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker, dealer or other financial intermediary, including your salesperson, to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.