"As Wall Street last week struggled to grasp what was happening, some analysts pointed to a wider market correction. But over the weekend, it emerged that the selling was the result of Goldman Sachs and Morgan Stanley unloading big block trades because Archegos had borrowed money for trades and wasn’t able to make good on its debts when the banks asked for more capital to cover losses, known as a margin call.
Morgan Stanley and Goldman Sachs did not comment, although Morgan Stanley has reported told investors it sold $15 billion worth of blocks in the last few days and has no more blocks to sell, according to CNBC.
In Archegos’ case, the firm used derivatives contracts with brokers, or swaps, to supercharge his trades, Bloomberg reported. But Hwang was forced by his bankers to sell more than $20 billion worth of shares after some trading positions moved against him, Bloomberg said".
I bet if SEC has any muscle to check GS' and MS' trading accounts in Puerto Rico, they would find these accounts held some big short positions in VIAC, DISCA right before the margin calls were executed. Bill Hwang was sleeping with foxes, he thought he'd be safe

; the pathetic part was he borrowed money from the foxes to build the positions up, then they turned around to bite his head off. was there altruism on Wall Street? Did you Bill Hwang is Korean descent, possibly SamSung's, Huyndai's, Chaebols', even Masayoshi Son's moneys were lost in the trade.