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　　cloud software provider Five9 shares fell 25% at the close on Monday after the CEO Rowan Trollope (Rowan Trolllope) announced his resignation. to the lowest level since March 2020.

　　Trollope said on Twitter that he would be heading to a pre-IPO startup to be CEO of a venture-backed company. He was replaced by former Five9 CEO Mike Burkland. Birkeland stepped down as CEO in 2017 after being diagnosed with cancer. He will replace Trollope as CEO on Nov. 28.

　　"It has been an honor and a privilege to serve our employees, customers and shareholders," Trollope tweeted.

　　Five9 provides call center software designed to serve customers more efficiently over the phone from any location.

　　In mid-2021, Zoom agreed to acquire Five9 in a $14.7 billion all-stock deal. Shares of the two companies have soared during the coronavirus pandemic as people across the country work remotely from home.

　　However, Five9's shareholders were not satisfied with the price Zoom intended to pay, and they ultimately rejected the deal. Investor interest in cloud computing stocks has since fallen sharply as rising interest rates and inflation concerns, combined with the reopening of many offices, have altered the industry's short-term trajectory.

　　Five9 has lost more than 70% of its market value since its share price peaked in August 2021. Shares of Zoom are also more than 85% below the record set at the end of 2020.

　　Trollope was a Cisco executive before joining Five9 in 2018. He said Five9 still had a "competitive advantage" and he remained bullish on the company's ability to "fit for the future."