Cathie Wood's ARK Investment Management bought more than a million shares of Twitter Inc (TWTR.N), a day after Jack Dorsey stepped down as the chief executive of the social networking site. ARK acquired 1.1 million Twitter shares worth $48.9 million at Tuesday's closing price of $43.94, according to the firm's daily trade report. They had lost 3.4% after opening lower. On Monday, after the company named its technology chief Parag Agrawal as the CEO, the shares had closed down 2.7%. read more Ark on Tuesday also bought 837,248 shares of online brokerage firm Robinhood Markets Inc (HOOD.O) worth $21.7 million. It had on the previous day bought 915,063 shares, taking an advantage of a pullback in shares. Reporting by Maria Ponnezhath in Bengaluru; Editing by Arun Koyyur Our Standards: The Thomson Reuters Trust Principles.