An order for an amount of shares greater than a round lot, but not a multiple of the round lot is a "Mixed Lot" order (aka a Partial Round Lot or PRL order)
- A mixed lot/PRL (i.e. 257 shares) direct-routed to NYSE/AMEX will be submitted in whole to the exchange (applies to both market and limit orders).
- A mixed lot/PRL (i.e. 257 shares) direct-routed to NYSE/ARCA will have only the round lot portion of the order submitted and, if it is executed, the IBKR system will cancel the remaining odd-lot portion of the order.
- A mixed lot/PRL (i.e. 257 shares) routed via IBKR Smart Routing will have all market centers eligible to receive the order according to the Smart Routing logic (including NYSE/ARCA).
Additional Information