But on Thursday Yahoo revealed another pretty good carrot to get Karp to sell: Yahoo will pay him $110 million in cash and stocks if he stays with the company for four years. So it said in a form filed to the SEC, and spotted by AllThingsD's Peter Kafka,
Specifically, he gets unvested stock options and restricted stock units valued at $29 million, Yahoo common stock valued at $41 million and $40 million cash. It averages out to $27.5 million a year.
Compare that to another fact Yahoo also revealed: Tumblr had $16.6 million in the bank when Yahoo bought it. It had raised $125 million total, including an $85 million round in 2011, according to Crunchbase. So it had burned through quite a bit of cash when Yahoo came calling.