Adam Neumann has sent a preliminary offer to buy WeWork out of bankruptcy for more than $500 million, five years after he was ousted by the office-sharing company he founded. CNBC spoke with multiple people familiar with the company and Neumann's offer. Investment firm Rithm Capital, which acquired Daniel Och's Sculptor Capital Management in November, is one of parties interested in financing the bid, sources told CNBC. That's because Neumann has previously named other financing sources in prior communications with WeWork's advisors that haven't come to fruition, the sources say. Baupost Group also was floated as a potential financing source months earlier but didn't join Neumann's latest bid, the people said.

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Persons: Adam Neumann, Neumann, Daniel Och's, haven't, Dan Loeb's, Baupost, WeWork, — Organizations: CNBC, Rithm, Capital Management, Baupost, Neumann's, Financial Times