Interactive Brokers enables TWS users to change trades' cost basis via Tax Optimizer tool - FinanceFeeds
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Monitoring Stock Loan Availability | IB Knowledge Base
BookTrader | Interactive Brokers LLC
Short Selling
Traderstewie on Twitter: "If you're using Robinhood as your primary broker for trading, please don't do that! If you're serious about your trading, I highly recommend you at least find an online
Slow market order fill on interactive brokers : r/options