Twitter names Jack Dorsey permanent CEO, will remain Square CEO; Adam Bain promoted to COO, Dick Costolo to step down from board
IT'S OFFICIAL: TWITTER MAKES JACK DORSEY FULL-TIME CEO — Jack Dorsey, cofounder of Twitter and Square, has been named Twitter's permanent CEO.
Context & Ripple Effects
This closes a four-month succession loop: after Dick Costolo stepped down as CEO in June, Twitter's board told investors the job was a "full-time commitment" — a direct shot at Dorsey's Square role — even as Square's IPO bankers prepared for both outcomes and Dorsey privately signaled he would not give up Square. Last week's report that the board had settled the Bain and Noto questions presaged exactly this outcome.
The announcement means the board formally reversed its own stated standard, keeping Dorsey atop both companies rather than forcing the either-or it once insisted on. Adam Bain's elevation to COO is the structural answer to the dual-CEO problem investors flagged: an operational deputy inside Twitter while Dorsey splits his time.
First-order effects
- Adam Bain gets the COO post, making him the day-to-day counterweight to a part-time CEO, while Costolo exits the board entirely — severing the last formal tie of the regime he led.
Second-order effects
- Square's IPO can proceed with its founding CEO intact, voiding the banker contingencies drawn up for a Dorsey departure, and the newly permanent leadership arrives alongside reported plans for company-wide layoffs next week.
Third-order effects
- If founder-led boards keep overriding their own full-time-CEO standards — as Twitter's just did publicly — the dual-hat founder CEO hardens into an accepted governance pattern rather than an exception.
The trend: Founder CEOs are reasserting control over the companies they created, with boards increasingly willing to accommodate split leadership they once ruled out.