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In mature markets like the US stock market, the closing price (Closing Price) holds significant reference value. It’s not only a summary of daily trading sentiment but also a benchmark for index calculations, fund net asset valuation, and portfolio valuations. Consequently, trading demand focused on closing prices has emerged. Within the Interactive Brokers (IB) trading platform, MOC (Market-on-Close, Closing Price) and LOC (Limit-on-Close, Limit Price) are important order types that allow investors to execute trades at the close.

This report aims to deeply analyze the U.S. equity options code “SST1G182500500.U,” particularly why its underlying stock code portion is displayed as “SST 1” instead of the original “SST” when sent to Interactive Brokers (IB). By analyzing the standardization structure of option symbols, related company behavior, and broker’s internal processing mechanisms, this report will elucidate the reasons behind this phenomenon and its impact on options traders. U.S. Equity Options Symbol Standardization (OSI) To ensure the efficient operation and transparency of the options market, the U.

Uncommon, it will definitely encounter it over time; related stock code: Berkshire Hathaway Text Some stock ticker symbols contain periods or other special characters in their names. When submitting these to Interactive Brokers (IB) via Fix, certain transformations of the stock code name are required. BRK/B -> BRK B Body For the Fidelity Securities case, it’s possible to analyze and implement the conversion rules are fixed through coding. When the rules are not fixed, generally the system needs to store the corresponding mapping relationships, which are updated periodically by business operations personnel.