Is Costco Wholesale Corporation (COST) a Durable Long-Term Compounder?

RiverPark Advisors , an investment advisory firm and sponsor of the RiverPark family of mutual funds, released its "RiverPark Large Growth Fund" Q1 2026 investor letter. A copy of the letter can be downloaded here . The US stock market declined in the quarter with the S&P 500 index ("S&P") and the Russell 1000 Growth index ("RLG") falling 4.33% and 9.78%, respectively. Markets started the year positively but became volatile mainly due to increased tensions with Iran. The Federal Reserve kept rates unchanged in January and February. Still, rising energy prices and weaker economic data sparked concerns about stagflation, leading investors to rethink the timing and scale of future rate cuts. Investor sentiment shifted from growth and tech stocks amid inflation, interest rate, and supply chain concerns. Opposing AI-driven rotations heavily influenced investor sentiment, affecting growth stocks—enthusiasm grew for semiconductor firms linked to AI infrastructure spending, while enterprise software companies, viewed as vulnerable to AI disruption, faced pessimism. The Fund's software holdings were sold off heavily, while the underweight in semiconductor companies, which benefited most from AI infrastructure spending, affected the performance. Despite challenges, the firm remains confident in the long-term prospects and valuations of its portfolio companies. Please review the Fund's top five holdings to gain insights into their key selections for 2026.

In its first-quarter 2026 investor letter, RiverPark Large Growth Fund highlighted Costco Wholesale Corporation (NASDAQ:COST) as a leading contributor. Costco Wholesale Corporation (NASDAQ: COST ) is a leading US based multinational retailer specializes in the operation of membership-only warehouses. On July 2, 2026, Costco Wholesale Corporation (NASDAQ:COST) closed at $951.67 per share, reflecting a market capitalization of $422.05 billion. Costco Wholesale Corporation (NASDAQ:COST) posted a one-month return of -2.08%, and its shares lost 3.58% over the past 52 weeks.

RiverPark Large Growth Fund stated the following regarding Costco Wholesale Corporation (NASDAQ:COST) in its Q1 2026 investor letter:

"Costco Wholesale Corporation (NASDAQ:COST): COST was the third-largest contributor for the quarter, gaining 16% as the company benefited from two distinct tailwinds. In the first two months of the quarter, Costco's consistent, membership-driven business model provided a defensive haven as investors rotated away from high-multiple technology stocks amid capex cycle concerns. Then in March, as the Iran conflict drove consumers toward value-seeking behavior, Costco's warehouse model and unmatched value proposition attracted incremental traffic. Comparable store sales growth remained in the mid-to-high single digits year-over-year, membership renewal rates remained above 90%, and e-commerce penetration continued to accelerate. The company's ability to compound through a variety of macro environments reinforced its status as one of the highest quality retailers globally.

We continue to view Costco as one of the most resilient and defensible businesses in the consumer sector. Its membership flywheel, strong private-label offering, and disciplined pricing strategy support consistent traffic and recurring revenue across economic cycles. With steady international expansion, industry-leading capital returns, and a loyal membership base that is difficult to disintermediate, Costco remains a durable long-term compounder."

Costco Wholesale Corporation (NASDAQ:COST) is not on our list of 40 Most Popular Stocks Among Hedge Funds Heading Into 2026 . According to our database, 107 hedge fund portfolios held Costco Wholesale Corporation (NASDAQ:COST) at the end of the first quarter, up from 106 in the previous quarter. While we acknowledge the potential of Costco Wholesale Corporation (NASDAQ:COST) 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 Costco Wholesale Corporation (NASDAQ:COST) and shared the list of best stocks to buy according to billionaire Richard Chilton. In addition, please check out our hedge fund investor letters Q1 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 .

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