Gundlach, 52, noticed the theft when he returned to his Santa Monica, Calif., home after a business trip to New York this week, the Los Angeles Times reported.
"There are basically four [pieces] that are in the non-replaceable category," he said Thursday. "The mix of things that were taken suggest that the people did not come to take art."
The stolen items included paintings by William Wendt, Jasper Johns, Piet Mondrian, Richard Diebenkorn, Guy Rose and Hanson Duvall Puthuff, a red 2010 Porsche Carrera, several expensive watches, bottles of wine and a small amount of cash.
Gundlach, a savvy investor who founded the DoubleLine Capital investment management firm, has offered a $200,000 reward for the safe return of the art and other items stolen from the home.