Shell has sponsored the event, annually held at the Golf Club of Houston the week before the Masters, since 1992. Only the Honda Classic (1982) and AT&T Pebble Beach Pro-Am (1986) have had longer runs with their current sponsors.
"We greatly appreciate all that Shell has done over the years to support its hometown tournament and the wonderful charitable work of the HGA," PGA Tour commissioner Tim Finchem said in a release. "We will begin the search for a new title sponsor right away and are confident we will be successful in those efforts."
The news is the latest development in what has been a relatively active few months for tournament sponsorship changes on Tour. The Frys.com Open will be christened as the Safeway Open when it kicks off the 2016-17 season in October, while Hyundai is moving its title sponsorship from the Tournament of Champions to what was formerly the Northern Trust Open beginning next year.
Northern Trust, in turn, is inheriting the first FedEx Cup playoff event, now known as The Barclays, starting in 2017.
Last week the Tour announced that the WGC-Cadillac Championship will shift next year from Trump National Doral in Miami to a course outside Mexico City, where it will be sponsored by Grupo Salinas.
The Tour remains in search of a title sponsor for the winners-only event in Hawaii.