Diamond Hill Long-Short Fund (DIAMX) is a mutual fund managed by Diamond Hill Capital Management, Inc., employing a long-short equity investment strategy focused on high-conviction stock selection across market capitalizations. The fund invests primarily in common stocks of U.S. companies that the investment team deems undervalued, taking long positions in attractively priced securities and short positions in overvalued ones; it maintains flexibility in net exposure, sector allocations, and position sizing to capitalize on mispricings while seeking to mitigate market risk. Diamond Hill Capital Management, founded in 1998 and headquartered in Columbus, Ohio, oversees the fund as part of its broader offerings in asset management, including other equity, fixed-income, and alternative strategies for institutional and retail investors primarily in the United States. Recent developments include the fund's continued strong performance attribution to its disciplined valuation discipline amid volatile markets, with portfolio managers emphasizing quality growth stocks in long positions and shorts concentrated in high-valuation sectors; in 2024, Diamond Hill Capital Management expanded its distribution through strategic alliances with additional platforms and reported assets under management surpassing $10 billion, reflecting robust inflows into its long-short strategies. The firm operates exclusively in the U.S. investment management industry, targeting sophisticated investors seeking absolute returns decoupled from broad market beta.