SAN DIEGO - A man posing as a delivery person forced his way into the home of Southern California business titan Ernest Rady, holding Rady's wife and housekeeper hostage while demanding cash, then shocking Rady with a stun gun before fleeing, police said Wednesday.

Rady, a Wachovia Corp. director, made a $2.1 billion fortune by establishing Westcorp, one of the country's largest auto finance companies. It was sold to the Charlotte bank in 2005 for $3.42 billion. Rady was ranked No. 140 last year on Forbes magazine's list of 400 richest Americans.

Rady, 69, wasn't home when the suspect arrived at the La Jolla residence around 4:30 p.m. Tuesday, said San Diego Police Department watch commander Jim Schorr.

The man pretended to be a delivery person and knocked on the door. After Rady's wife, accompanied by the couple's housekeeper, opened the door, the suspect pulled out a handgun and forced his way in, police said.

The two women were taken to a back bedroom, where they were bound with duct tape, police said.

Less than two hours later, Rady arrived and was stunned by the intruder. He was hospitalized for minor injuries, police said.

The man left the house at about 10 p.m. with little cash and no other valuables, police said. Schorr said the couple didn't keep a lot of cash in the house.

Police were searching for the man early Wednesday. He could face charges including kidnapping, robbery, burglary and assault.

Besides serving as one of the bank's board members, Rady is chairman of Wachovia's California banking division and its consumer finance division.