The robust growth of Charlotte-based AvidXchange, which recently attracted a $225 million investment from Bain Capital, has meant a $1.7 million payout for investors in Piedmont Angel Network's first fund. It was 2003 when Piedmont Angel Network made what was then only its third investment- a $250,000 stake in AvidXchange, which then was just a little-known but growing electronic invoicing software company catering to the real estate industry. Now AvidXchange has broken ground on a 200,000-square-foot...