The boss of the world’s largest money manager told corporate chiefs to prepare for BlackRock Inc. to become a more assertive shareholder.

Laurence Fink in his annual letter to chief executives of companies in which BlackRock invests called on them to better articulate their long-term plans and how their organizations contribute to society, and said the New York money manager will have more frequent and in-depth conversations with them. He has made similar appeals to CEOs in past letters.

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