Oakmark Funds is a family of mutual funds known for its outstanding performance. As of April 2015, the Oakmark Global Fund (OAKGX) and the Oakmark Fund (OAKMX) were each ranked No. 1 in their categories for performance over the last 15 years by Morningstar, according The Motley Fool. The Oakmark Fund's returns consistently beat the Standard and Poor 500 index over the 15-year period from 2000 to 2015.
The Oakmark mutual fund family as a whole achieved total returns exceeding the average of its competitors during the period from 2012 to 2014, according to Morningstar. The fund family posted a three-year return of 14.98 percent and a five-year return of 11.62 percent as of July 2015.
Oakmark Funds is managed by Harris Associates, a Chicago investment advisory firm. Oakmark offers no-load mutual funds, and its managers take a value-oriented approach to investing, states the company. Its oldest offering, the Oakmark Fund, which was started in 1991, has employed a buy-and-hold strategy for much of that time. An investment of $10,000 in the Oakmark Fund in 1991 would have grown to more than $169,000 by Sept. 2015. The fund outranked total S & P 500 returns from inception until Dec. 2015 by several points, with annual average total returns of 12.51 percent.