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Masayoshi Son, the CEO of the Japanese mega-investor SoftBank, has told colleagues "we created a monster" in WeWork, the Financial Times reported Monday.

The Financial Times also said SoftBank on Wednesday would impose stricter governance standards on dual-class share structures after the WeWork fiasco.

SoftBank is expected to take a multibillion-dollar write-down on WeWork, the Financial Times said.

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Masayoshi Son, the CEO of the Japanese mega-investor SoftBank, has told colleagues that "we created a monster" in WeWork after investing billions into the firm only to later have to bail it out, the Financial Times reported Monday.

SoftBank last month bailed out the cash-strapped real-estate firm to the tune of just over $8 billion, with an accelerated payment of $1.5 billion just to ensure the company didn't run out of money. As one of the company's main backers, SoftBank now under scrutiny for the way it invests.

The Financial Times also separately reported, citing unnamed sources, that SoftBank on Wednesday would impose stricter governance standards on dual-class share structures after the WeWork fiasco — an about-face for Son, who the newspaper said was "known as a risk-addicted dealmaker."

SoftBank is expected to take a multibillion-dollar write-down on WeWork, the Financial Times said.

Before the bailout, SoftBank had invested more than $10 billion in WeWork, and the office-sharing firm was valued at $47 billion at its peak. The firm planned to go public, and backers dreamed of a valuation of more than $100 billion.

But intense scrutiny over WeWork's governance and business model caused the firm to indefinitely delay its plans for an initial public offering, and its idiosyncratic cofounder Adam Neumann stepped down as CEO in September before the bailout last month.

The Financial Times cited a person close to Son as saying he had been shaken by the ordeal. The Japanese magnate has said little publicly about WeWork since the funding deal, though he has said he is "embarrassed" in general by SoftBank's missteps.

"We created a monster," Son has told colleagues, according to the paper. And in reference to Neumann: "We gave him all the capital."

This, along with Uber, which has lost more than a quarter in value since going public and according to CNBC has cost the Japanese firm $600 million so far, is leading investors to worry about the rest of SoftBank's ventures.

"If SoftBank says this is the value, how much of that should you believe?" the Financial Times quoted Kirk Boodry, a technology analyst at Redex Holdings who publishes on Smartkarma, a research platform, as saying.

WeWork and SoftBank did not immediately respond to requests for comment from Business Insider.

Read the Financial Times' report here.

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