Salesforce.com Inc. said its co-chief executive Keith Block is stepping down from his role, just 18 months after taking the job, ending for now a brief experiment with dual CEOs that leaves Marc Benioff solely in charge of the business-software provider.

Mr. Block, a longtime Oracle Corp. executive, joined Salesforce in 2013 as president and vice chairman. He became co-CEO in 2018 in an unusual setup that paired him with Mr. Benioff, a Salesforce co-founder with a wide array of outside interests that now include ownership…

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