I agree, very strange name for a company, but this is what I have found online in multiple source locations.
"Jim and Myrna Reahard of Grand Bay, Alabama, and four partners purchased three trawlers in 1989, including the Mistake, and formed the Grumpy Company. Sailing out of Pascagoula, Mississippi, fishermen sought butterfish feeding on the bottom in deep waters of the Gulf. On more than one occasion, the Reahards daydreamed of what they would do if one of their boats found a treasure ship. When their dream came true in August, 1993, they agreed the first step would be to hire a good maritime law attorney. They soon found one when David Horan, who won a case in the Supreme Court for treasure salvor Mel Fisher, took the case. He promptly suggested the Reahards form a salvage partnership and file an Admiralty claim on the site. Located 50 miles south of New Orleans, the ship was in international waters where federal maritime law supersedes state law. This was a major break for the company they named Grumpy Partnership. Otherwise, it would have faced the state bureaucracy if the wreck had been found closer to the shoreline. There were permit applications and other delays, but after the Grumpy group appeared in U.S. District Court and won ownership, the door to major salvage was opened."