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 Insmed Incorporated (NASDAQ:INSM). The Fund exited its position in Insmed Incorporated (NASDAQ:INSM), a clinical-stage biotechnology company that develops and commercializes therapies for patients with serious and rare diseases, during the quarter. On September 15, 2026, Insmed Incorporated (NASDAQ:INSM) closed at $119.92 per share. Over the past month, Insmed Incorporated (NASDAQ:INSM) declined 7.49%, but its shares are down 16.51% over the past year. Insmed Incorporated (NASDAQ:INSM) has a market capitalization of $26.19 billion, and its stock has traded within a 52-week range of $90.39 and $212.75.
Parnassus Growth Equity Fund stated the following regarding Insmed Incorporated (NASDAQ:INSM) in its Q2 2026 investor letter:
"Insmed Incorporated (NASDAQ:INSM)shares fell after sales of the biopharmaceutical company's new lung drug Brinsupri fell short of ******* ysts' expectations. We exited the position during the quarter. Insmed's thesis had largely played out following positive TPIP data and upward revisions to Brinsupri sales. We redeployed capital to Twist Bioscience, which offers a longer runway for growth."
Insmed Incorporated (NASDAQ:INSM) is not on our list of the 40 Most Popular Stocks Among Hedge Funds. According to our database, 88 hedge fund portfolios held Insmed Incorporated (NASDAQ:INSM) at the end of the second quarter, compared to 67 in the previous quarter. While we acknowledge the potential of Insmed Incorporated (NASDAQ:INSM) 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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