Nearly two years after Elon Musk’s acquisition, X’s business is still struggling to climb out of the deep hole it fell into under his ownership.
The $13 billion that Elon Musk borrowed to buy Twitter has turned into the worst merger-finance deal for banks since the 2008-09 financial crisis.
The seven banks involved in the deal, including Morgan Stanley and Bank of America, lent the money to the billionaire’s holding company to take the social-media platform, now named X, private in October 2022. Banks that provide loans for takeovers generally sell the debt quickly to other investors to get it off their balance sheets, making money on fees.
You don't really understand the point I think, whether it's correct or not I don't know. His theoretical wealth is derived from the price of the last share sold. He probably can't just sell ($13bn/current share price) shares and get $13bn out of that, there aren't enough buy orders at that price, and you risk a panic sell by other holders. These other holders possible also include the banks were talking about, or at least related businesses and their clients.
Long story short, if banks had him liquidate shares worth $13bn, his net worth would fall (not the banks direct problem, bit probably wouldn't make future client acquisition easier); but it might be that they lose more money indirectly. All this calculation with a stock's market cap is a bit like a house of cards; it's really high, but don't shake it too much. At least that's an issue with overvalued stocks; sound businesses where the stock price reflects the company's actual value, maybe even pays dividend, don't have that problem.