The epic 30-year love-hate relationship of billionaire CEOs Larry Ellison and Marc Benioff

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Benioff Salesforce Ellison Oracle

Mike Nudelman/Business Insider

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Oracle CEO Larry Ellison and Salesforce CEO Marc Benioff's on and off relationship makes for one of the most interesting storylines in Silicon Valley.

Ellison took Benioff under his wing and turned him into a star executive by the age of 26. But after spending 13 years at Oracle, Benioff launched his own company called Salesforce in 1999, becoming one of Oracle's biggest rivals in the cloud software space.

The two love to trash talk each other's company, often getting into public feuds over their businesses. But some argue they're still good friends, and have great respect for each other.

Ellison is the fifth richest man in the world with a net worth of over $54 billion. Benioff is worth about $3.6 billion.

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Here's a summary of the epic 30-year love-hate relationship between the two business titans: