Twitter director Egon Durban, co-CEO of private equity firm Silver Lake, failed to get enough votes for re-election to the board.

Twitter Inc. director Egon Durban, the co-Chief Executive Officer of private equity firm Silver Lake, failed to get enough votes for re-election to the board during the company’s annual shareholder meeting Wednesday.

Institutional Shareholders Services Inc., an advisory firm, had recommended against Durban’s re-election because he serves on the boards of “more than five publicly-traded companies.”

Durban, however, may still remain a Twitter director despite failing to receive a majority of shareholder votes, according to Twitter’s proxy statement. The company requires board nominees to offer an “irrevocable resignation” in advance of the voting, which would kick in if a nominee failed to win the approval of shareholders and the board accepted the resignation. But the board has the power to reject the resignation, leaving the nominee as a director, according to the proxy statement.

“Egon Durban has tendered his resignation to the board,” a Twitter spokesperson said. “The Nominating and Corporate Governance Committee of the Board will promptly consider whether to recommend that the Board accept Mr. Durban’s resignation and provide an update in due course.”

Former Chief Executive Officer Jack Dorsey did not stand for re-election Wednesday, and is no longer a board member, ending his formal relationship with the social network he co-founded in 2006. He has been a director since 2007, and was most recently Twitter CEO from mid-2015 until his resignation last year.

It wasn’t a surprise that Dorsey didn’t stand for reinstatement to the panel — in November he said would step down as CEO as well as leave the board when his term expired. But Dorsey’s exit marks the first time in Twitter’s history that none of its co-founders is working at the company, or sitting on the board.

Twitter shareholders voted on a number of issues Wednesday, but didn’t weigh in on the biggest change confronting the San Francisco-based company: a looming buyout by billionaire Elon Musk. Twitter’s board accepted an offer from Musk in late April to take the company private for about $44 billion. The shareholder vote on whether to approve the deal will take place at a later date that hasn’t yet been announced.

Musk, the world’s richest person, has pledged dramatic changes at Twitter once he takes over, and the current board isn’t expected to stay in place once he takes the company private. Also declining to stand for re-electionwas Robert Zoellick, former president of the World Bank, who has been a Twitter director since 2018. Twitter board member Patrick Pichette, Google’s former finance chief, was re-elected. Twitter’s other seven director seats weren’t up for renewal this year.

A proposal that would have declassified the company’s board of directors and required members to stand for re-election each year was rejected by shareholders. Currently, board members receive three-year terms when they are elected, a strategy that makes it difficult for an outside activist investor to come in and force board changes in a short period of time.