Monarch co-founders (left to right) Ozzie Osman, Jon Sutherland, Val Agostino.Courtesy: MonarchThe personal finance startup Monarch has raised $75 million to accelerate subscriber growth that took off last year when budgeting tool Mint was shut down, CNBC has learned.The fundraising is among the largest for an American consumer fintech startup this year and values the San Francisco-based company at $850 million, according to co-founder Val Agostino. The Series B round was led by Forerunner Ventu...