The exchange's enforcement arm says JPMorgan inaccurately marked sell orders, submitted inaccurate trading data and transacted short sales without reasonable grounds to believe the stocks could be borrowed.

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The current rules don't require the brokers to fix the trades by buying shares to cover their short positions after 13 days, they merely say that if the trades aren't fixed, the broker can't do any more short-sales in that security without borrowing or arranging to borrow the stock.

FORBES: Magazine Article