Woodland Hills-based Youbet.com Inc. said that the company and its IRG and United Tote subsidiaries shattered all previous records for betting volume on May 6, the day Barbaro streaked to victory in the 132nd Kentucky Derby at Churchill Downs.

Youbet.com processed nearly $5.6 million in wagers on Derby Day, a 34 percent more than in 2005. It’s the fourth year in a row that bettors drove Youbet’s handle to the highest one-day total in company history.

United Tote processed a record $175.0 million in wagers for the full day’s race card at Churchill Downs. International Racing Group handled $4.3 million in live operator assisted wagers on race day, 69 percent of which went to the Churchill pari-mutuel pools.

The company said its marketing initiatives this year enabled the company to sign up more than 6,000 new customers in the two days leading up to the Derby.