When did OneChicago close?

Yes. When you select a tax lot matching method for today, this will change the lot matching method on all applicable closing trades, including trades that have not yet settled.

Note…

Any open position can be closed by the IBKR Liquidation system when an account is in a margin deficit. To avoid a Liquidation a Reg T Margin account must have positive Excess Liquidity at all times and Positive SMA starting at 15:50 EST which is the start of the Reg T check period. A Margin or Portfolio Margin account must have positive Excess Liquidity at all times. A Cash account must have a positive cash balance at all times…

The minimum age to open an account is 18. Customers between the ages of 18 and 21 are eligible to trade stocks in a Cash Account provided they meet all other requirements. For further details on Trade Requirements, please visit the IBKR website…

Loaned shares may be sold at any time, without restriction. The shares do not need to be returned in time to settle your sale of the share and proceeds from the sale are credited to the client’s account on the normal settlement date. In addition, the loan will be terminated on the open of the business day following the security sale date…