Market Context
Diamond Hill Capital, an investment management firm, issued its "Mid Strategy" fourth-quarter 2025 investor letter on March 18, 2026. The report outlines performance metrics for the equity markets and specific holdings within their portfolio.
During the fourth quarter of 2025, equity markets experienced favorable gains. Small cap positions returned 2.19%, while large cap positions returned 2.41%. In contrast, the mid-cap range lagged with the Russell Mid Cap Index returning 0.16%. The Diamond Hill Mid Strategy achieved a net return of 3.65% in Q4, significantly outperforming the index's 0.16% return.
Year-to-date (YTD), the strategy returned 13.47%, compared to the Index's 10.60%. Throughout 2025, AI-related spending remained a primary driver for equity markets, although investor caution regarding potential market bubbles caused a pause in December. The Strategy remains positioned for ongoing uncertainty given elevated valuations.
WESCO International Analysis
The letter specifically highlighted WESCO International, Inc. (NYSE: WCC), a provider of business-to-business distribution, logistics services, and supply chain solutions. As of March 17, 2026, the stock closed at $261.51 per share with a market capitalization of $12.705 billion.
Performance data for WESCO includes:
- One-month return: -13.48%
- 52-week gain: 57.16%
- Q4 2025 Revenue: $6.1 billion (up 10% year over year)
- Organic sales growth: 9%
Regarding the stock, Diamond Hill Mid Strategy stated:
"Electrical products distributor WESCO International, Inc. (NYSE:WCC) outperformed in Q4 after reporting solid Q3 results and raising 2025 guidance. Better-than-expected organic growth was driven by its rapidly expanding data center business, which reached nearly 20% of total revenue."
Hedge Fund Sentiment
According to the source database, WESCO International is not on the list of 40 Most Popular Stocks Among Hedge Funds Heading Into 2026. At the end of the fourth quarter, 48 hedge fund portfolios held WCC shares, a decrease from 49 in the previous quarter.
While acknowledging WESCO's investment potential, the analysis suggests that certain AI stocks may offer greater upside potential with less downside risk. The report notes interest in undervalued AI stocks benefiting from Trump-era tariffs and onshoring trends.
Key Takeaway
Diamond Hill Capital's Q4 2025 letter underscores strong performance for its Mid Strategy, driven by small and large cap gains. WESCO International was recognized for robust organic growth fueled by its data center segment, though the author notes that other AI equities may currently present superior risk-reward profiles.
Original source
Solid Results and Improved Guidance Lifted WESCO International (WCC) in Q4
Published: Mar 18, 2026
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