0000810902 2025-09-30 2025-09-30 0000810902 bift:S000000583Member 2025-09-30 2025-09-30 false 2025-09-30 497 0000810902 BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND) N-1A <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri; font-weight: bold; text-align: center;">BARON INVESTMENT FUNDS TRUST<sup style="font-size: 75%; vertical-align: top;">®</sup></div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri; text-align: center;">Supplement to the Summary Prospectus, Prospectus and Statement of Additional Information (“SAI”) dated January 28, 2026, as supplemented</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">The Summary Prospectus, Prospectus and SAI are hereby revised as follows:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri; font-weight: bold;">Effective June 1, 2026, Baron Growth Fund’s name will change to Baron Generational Growth Fund. Accordingly, effective June 1, 2026, all references to Baron Growth Fund (the “Fund”) in the Fund’s Summary Prospectus, Prospectus and Statement of Additional Information will be replaced with Baron Generational Growth Fund.</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">The Summary Prospectus and Prospectus are hereby revised as follows:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri; font-weight: bold;">Effective June 1, 2026, the principal investment strategies of Baron Generational Growth Fund (the “Fund”) are hereby replaced in their entirety by the following:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">Principal Investment Strategies of the Fund</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri;">The Fund is a diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. small-sized growth companies. BAMCO, Inc. (“BAMCO” or 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. 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, and the Fund may continue to add to its investments in those securities even if their market capitalizations exceed the largest market cap stock in the Russell 2000 Growth Index at reconstitution.</div> <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri; font-weight: bold; text-align: center;">BARON INVESTMENT FUNDS TRUST<sup style="font-size: 75%; vertical-align: top;">®</sup></div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri; text-align: center;">Supplement to the Summary Prospectus, Prospectus and Statement of Additional Information (“SAI”) dated January 28, 2026, as supplemented</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">The Summary Prospectus, Prospectus and SAI are hereby revised as follows:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri; font-weight: bold;">Effective June 1, 2026, Baron Growth Fund’s name will change to Baron Generational Growth Fund. Accordingly, effective June 1, 2026, all references to Baron Growth Fund (the “Fund”) in the Fund’s Summary Prospectus, Prospectus and Statement of Additional Information will be replaced with Baron Generational Growth Fund.</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">The Summary Prospectus and Prospectus are hereby revised as follows:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri; font-weight: bold;">Effective June 1, 2026, the principal investment strategies of Baron Generational Growth Fund (the “Fund”) are hereby replaced in their entirety by the following:</div> <div style="margin-top: 12pt; margin-bottom: 0pt; font-size: 10pt; font-family: calibri;">Principal Investment Strategies of the Fund</div> <div style="margin-top: 12pt; margin-bottom: 0pt; text-indent: 9%; font-size: 10pt; font-family: calibri;">The Fund is a diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. small-sized growth companies. BAMCO, Inc. (“BAMCO” or 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. 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, and the Fund may continue to add to its investments in those securities even if their market capitalizations exceed the largest market cap stock in the Russell 2000 Growth Index at reconstitution.</div> 2026-01-28