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Parnassus Investments, an investment management company, released the "Parnassus Growth Equity Fund" second-quarter 2026 investor letter. The letter can be downloaded here. During the quarter, the Fund (Investor Shares) returned 17.49% (net of fees), outperforming the Russell 1000 Growth Index's 16.74%. Holdings in Information Technology and Consumer Discretionary sectors boosted relative returns, while Communication Services and Financials holdings detracted. For the year-to-date period, the Fund returned 6.17% (net of fees), outperforming the Russell 1000 Growth's 5.33%. The firm remains constructively bullish on U.S. equities and continues to be selective, valuation-sensitive, and focused on disruptive growth opportunities through active stock selection. Growth stocks advanced during the second quarter, as the Russell 1000 Growth Index generated strong double-digit returns driven by increased confidence in the durability of the ongoing artificial intelligence (AI) infrastructure build-out. Additionally, reviewing the Fund's top five holdings could help identify its best picks for 2026.

In its second-quarter 2026 investor letter, Parnassus Growth Equity Fund highlighted Comfort Systems USA, Inc. (NYSE:FIX) as a new position. Comfort Systems USA, Inc. (NYSE:FIX) is a leading mechanical and electrical installation, renovation, maintenance, repair, and replacement services provider to commercial, industrial, and institutional customers. On September 15, 2026, Comfort Systems USA, Inc. (NYSE:FIX) closed at $1,576.78 per share. Over the past month, Comfort Systems USA, Inc. (NYSE:FIX) declined 5.15% and its shares gained 110.86% over the past 52 weeks. Comfort Systems USA, Inc. (NYSE:FIX) has a market capitalization of $55.49 billion.

Parnassus Growth Equity Fund stated the following regarding Comfort Systems USA, Inc. (NYSE:FIX) in its Q2 2026 investor letter:

"Other positions added during the quarter included Comfort Systems, a mechanical, electrical and plumbing contractor. Comfort Systems USA, Inc. (NYSE:FIX) is a mechanical, electrical and plumbing contractor that provides the skilled labor that's essential for building increasingly complex data centers, where demand continues to accelerate alongside AI investment."

Comfort Systems USA, Inc. (NYSE:FIX) is not on our list of the 40 Most Popular Stocks Among Hedge Funds. As per our database, 83 hedge fund portfolios held Comfort Systems USA, Inc. (NYSE:FIX) at the end of the second quarter which was 80 in the previous quarter. While we acknowledge the potential of Comfort Systems USA, Inc. (NYSE:FIX) 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 discussed Comfort Systems USA, Inc. (NYSE:FIX) and shared Artisan Mid Cap Fund's views on the company. 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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This article is originally published at Insider Monkey.