Here's What Boosted Amphenol Corporation (APH) in Q3

Madison Investments, an investment advisor, released its “Madison Mid Cap Fund” third-quarter 2025 investor letter. A copy of the letter can be downloaded here. In the third quarter, the fund (Class I) returned 1.9% compared to the 5.3% increase for the Russell Midcap Index. The Russell Mid Cap Index experienced significant growth in the third quarter of 2025. Information Technology led the performance both in the quarter and YTD. In addition, please check the fund’s top five holdings to know its best picks in 2025.

In its third-quarter 2025 investor letter, Madison Mid Cap Fund highlighted stocks such as Amphenol Corporation (NYSE:APH). Amphenol Corporation (NYSE:APH) designs and manufactures electrical, electronic, and fiber optic connectors. The one-month return of Amphenol Corporation (NYSE:APH) was -2.59%, and its shares gained 75.47% of their value over the last 52 weeks. On November 20, 2025, Amphenol Corporation (NYSE:APH) stock closed at $130.36 per share, with a market capitalization of $159.568 billion.

Madison Mid Cap Fund stated the following regarding Amphenol Corporation (NYSE:APH) in its third quarter 2025 investor letter:

"Technology stocks continued their very strong performance in 3Q, and we participated with Amphenol Corporation (NYSE:APH), Arista Networks, and MKS within our portfolio. Amphenol and Arista continue to surprise investors with outstanding revenue growth as they capitalize on the surge in Al-related data center spending. While data center growth is a meaningful benefit, we are also encouraged by the strength in other areas of these businesses, such as enterprise for Arista and defense and industrial markets for Amphenol."

Amphenol Corporation (NYSE:APH) is not on our list of 30 Most Popular Stocks Among Hedge Funds. As per our database, 81 hedge fund portfolios held Amphenol Corporation (NYSE:APH) at the end of the second quarter, up from 69 in the previous quarter. Amphenol Corporation’s (NYSE:APH) third quarter sales were up 53% in US dollars and 52% in local currencies to $6.194 billion. While we acknowledge the potential of Amphenol Corporation (NYSE:APH) 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 Amphenol Corporation (NYSE:APH) and shared the list of best aggressive growth stocks to buy. Amphenol Corporation (NYSE:APH) contributed to Baron Asset Fund’s performance in Q3 2025, as its shares rallied on rising data center spending expectations driven by accelerating AI adoption. In addition, please check out our hedge fund investor letters Q3 2025 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.