Memphis, TN-based SouthernSun Asset Management is closing its SouthernSun Small Cap Fund (SSSFX) to new investors on May 17, according to a regulatory filing.

The fund, which bets on a non-diversified portfolio of common stocks of smaller capitalization U.S. companies, was launched in October 2003 and is managed by Michael Cook, founder, chief executive officer, and chief investment officer of SouthernSun. It managed some $580 million as of April 11.

Tucker Davis, a spokesman for the firm, was not immediately available to comment on the fund’s closing.

The firm also manages the SouthernSun U.S. Equity Fund (SSEFX, SSEIX, SSECX), which launched in May 2012.

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