Twitter (NYSE:TWTR) CEO Jack Dorsey has announced the departure of four senior executives, in a move to shake up Twitter’s management and improve the company’s standing for investors.

Dorsey tweeted the news on Sunday night, saying that he was “forever grateful” to the media head Katie Jacobs Stanton, product head Kevin Weil, head of engineering division, Alex Roetter, and HR executive Brian Schipper for “everything they’ve given to Twitter”.

According to those familiar with the matter, Twitter will be bringing in two more board members as soon as possible – perhaps as early as later this week. Twitter’s stock has fallen over 50 percent of late, now sitting below its IPO price, and the moves are part of Dorsey’s regime designed to encourage further investment – which has so far been slow to take off.

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