Warren Buffett on Monday assured shareholders of Berkshire Hathaway they need not worry about his upcoming departure as chief executive, giving a full-throated endorsement to his successor Greg Abel and promising to remain a major stockholder in the conglomerate.

Warren Buffett on Monday gave yet another strong endorsement to Greg Abel, who will take over as Berkshire Hathaway’s chief executive in January, and promised to maintain a significant stake in the company to reassure shareholders about the leadership transition.