WeWork cofounder and CEO Adam Neumann smoked weed with friends on a Gulfstream G650 private jet to Israel last summer, The Wall Street reported.

The flight crew found a "sizable chunk" of marijuana "stuffed in a cereal box" on board after Neumann's squad exited the aircraft.

The jet's concerned owner recalled the aircraft after the discovery was made.

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WeWork cofounder and CEO Adam Neumann smoked weed with friends on a Gulfstream G650 private jet to Israel last summer, The Wall Street Journal's Eliot Brown reported on Wednesday.

The flight crew found a "sizable chunk" of marijuana "stuffed in a cereal box" on board after Neumann's squad exited the aircraft. The group had stowed away the extra weed for the return flight to New York, sources told The Journal.

The jet's concerned owner recalled the aircraft after the discovery was made.

The We Company declined to comment on the report.

Read more: WeWork CEO Adam Neumann has a $4.1 billion net worth — Here's how he spends his money

Neumann's party-boy past is well-documented. Neumann told Baruch College's graduating class in 2017 that when he first arrived in New York, he spent much of his time clubbing, "hitting on every girl in the city," and trying to get rich, New York magazine reported.

Now Neumann is struggling to take The We Company, WeWork's parent company, public. Its IPO has already been delayed after facing weak investor interest. The We Company is now considering a valuation in the range of $10 billion to $12 billion for its IPO — down from its $47 billion private valuation in January — according a report from Reuters.