No — Michael Rubin is not confirmed to be left-handed, as no reliable public source currently confirms his left-handedness.

Michael Rubin is an American businessman and entrepreneur, widely recognized as the CEO of Fanatics, a leading online retailer of licensed sports merchandise.

He founded GSI Commerce in 1995, which he later sold to eBay in 2011, retaining Fanatics, Rue La La, and ShopRunner as part of the deal.

Rubin is also a co-owner of the NBA's Philadelphia 76ers and the NHL's New Jersey Devils, demonstrating his deep involvement in the sports industry.

Known for his innovative approach to e-commerce and his influential network, Rubin hosts an annual 'White Party' that attracts numerous celebrities and business leaders.