Charles Schwab (SCHW) said Thursday that it's buying publicly traded investing platform Forge Global Holdings (FRGE), which acts as a marketplace for pre-IPO companies, for $660 million. The all-cash deal gives one of the country’s largest wealth management platforms more scale to offer customers access to shares of privately held companies, and it's just the latest move in the building finance wave of getting private assets into everyday investor accounts. During Thursday morning trading, Schwab’s stock ...