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Baron Capital, an investment management company, released its Q2 2026 investor letter for the "Baron Focused Growth Fund". A copy of the letter can be downloaded here. In the second quarter, the Baron Focused Growth Fund achieved a 13.26% gain, still trailing the Russell 2500 Growth Index's 24.02% return. The underperformance was driven by ongoing concerns about AI's impact on portfolio businesses and underexposure to AI infrastructure. The IPO of SpaceX provided a boost, but overall, the Fund's companies are generating robust revenue growth and strengthening margins through enhanced client engagement and product offerings. Many stocks remain historically undervalued, and companies are beginning accelerated share repurchases, bolstering investor confidence. The Fund is perceived as compelling, benefiting from favorable market conditions and strong balance sheets, while inflation and interest rates are expected to remain stable. The Fund has outperformed its Benchmark over the past 3, 5, and 10 years, showing significant excess returns with lower market risk, attributed to a research-driven investment approach. The Fund maintains a commitment to long-term investing in growth-oriented businesses, utilizing a balanced portfolio to mitigate risk and potentially enhance returns. Please review the Fund's top five holdings to gain insights into their key selections for 2026.

In its Q2 2026 investor letter, Baron Focused Growth Fund highlighted Interactive Brokers Group, Inc. (NASDAQ:IBKR). Interactive Brokers Group, Inc. (NASDAQ:IBKR), an automated electronic broker that provides trading, clearing, and custody services, contributed 1.12% to the Fund's performance this quarter. On August 19, 2026, Interactive Brokers Group, Inc. (NASDAQ:IBKR) closed at $90.54 per share, reflecting a market capitalization of $154.26 billion. Interactive Brokers Group, Inc. (NASDAQ:IBKR) posted a one‑month return of -1.33%, while its shares gained 44.93% over the past 52 weeks.

Baron Focused Growth Fund stated the following regarding Interactive Brokers Group, Inc. (NASDAQ:IBKR) in its Q2 2026 investor letter:

"Global electronic brokerage firm Interactive Brokers Group, Inc. (NASDAQ:IBKR) contributed to performance as the company continued to compound growth at a rare pace for its scale. Client accounts increased 34% year over year to 5.2 million, customer equity grew 40%, and margin loan balances rose 67%. Trading activity remained robust, with June daily average revenue trades increasing 53% year over year. Operating on a highly automated, low-cost platform, Interactive Brokers benefits from substantial operating leverage as volume grows, supporting industry-leading pretax margins. New opportunities, including an expanded prediction markets offering and the favorable modernization of day-trading margin rules, further extend the company's growth runway. We retain conviction in the stock, viewing Interactive Brokers as a structural share gainer with a large global addressable market that few competitors can serve at similarly low cost."

Interactive Brokers Group, Inc. (NASDAQ:IBKR) is not on our list of 40 Most Popular Stocks Among Hedge Funds Heading Into 2026. According to our database, 70 hedge fund portfolios held Interactive Brokers Group, Inc. (NASDAQ:IBKR) at the end of the first quarter, compared to 81 in the previous quarter. While we acknowledge the potential of Interactive Brokers Group, Inc. (NASDAQ:IBKR) as an investment, we believe certain AI stocks offer greater upside potential and carry less downside risk. If you're looking for an extremely undervalued AI stock that also stands to benefit significantly from Trump-era tariffs and the onshoring trend, see our free report on the best short-term AI stock.

In another article, we covered Interactive Brokers Group, Inc. (NASDAQ:IBKR) and shared a list of wonderful stocks to buy. In addition, please check out our hedge fund investor letters Q2 2026 page for more investor letters from hedge funds and other leading investors.

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Disclosure: None. This article is originally published at Insider Monkey.