The US Securities and Exchange Commission has raised concerns over Rokos Capital Management after the hedge fund was forced to hand over large amounts of cash to its banks as collateral when an outsized bet on US government bonds backfired earlier this month.
SEC chair Gary Gensler brought up the hedge fund during calls with UK regulators this week after it faced larger margin calls than peers, according to people familiar with the conversations.
The US regulator does not supervise…
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