Amanda Stebbins

SARATOGA SPRINGS, N.Y. - Every one of the 2,570 partners in MyRacehorse's Seize the Grey (Arrogate) has a story about their GI Belmont S.-bound Preakness winner. Or three. Or six. Truth be told, probably more. They are co-owners, albeit with micro shares that cost a mere $127, of the winner of a Triple Crown race, who will try to add a second jewel on Saturday when the 156th Belmont is run for the first time at Saratoga Race Course. They are part of a movement begun 55 years ago by...