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.

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