BlackRock's Mark Wiedman was promoted to a new role overseeing the international business and corporate strategy. The move positions him as Larry Fink's 'heir apparent,' said one BlackRock analyst. His promotion led to two other management changes for the firm's hot exchange-traded funds platform and its US wealth advisory business. In a memo obtained by Business Insider, Fink hinted at more changes later this year. BlackRock chief executive Larry Fink stirred more speculation about his successor on Wednesday when he promoted Mark Wiedman, formerly head of one of the firm's fastest-growing businesses.