BlackRock CEO Larry Fink at the Yahoo Finance All Markets Summit in February 2017.Rob Kim/Getty Images BlackRock's Larry Fink wrote in his annual letter to CEOs about the record number of workers quitting. Fink said that workers seeking new opportunities is a good thing and that companies have to adapt. Companies that don't adjust to the "new reality" will "do so at their own peril," he said. We're in a new world of work, according to BlackRock CEO Larry Fink — and he says that's a good thing.In his annual letter to CEOs, Fink touched on everything he thought was "vital to driving durable long-term returns" and helping the company's clients reach their goals.