A combination order is a special type of order that is constructed of multiple separate positions, or ‘legs’, but executed as a single transaction.  The legs of the combination may be comprised of the same position type (e.g. stock vs. stock, option vs. option or SSF vs. SSF) or different position types (e.g. stock vs. option, SSF vs. option or EFP).  It’s important to note that many combination order types, while submitted via the IB trading platform as a combination, are not native to (i.e., supported by) the exchanges and therefore may not be guaranteed by IB.  Accordingly, IB’s policy is to guarantee only Smart-Routed U.S. stock vs. option and option vs. option combination orders.

As combination orders which are not guaranteed are exposed to the risk of partial execution, both in terms of the quantity of legs and their balance, IB requires account holders to acknowledge the 'Non-Guaranteed' attribute at the point of order entry.  There are two methods for setting this attribute:

• Method 1 - Users can select the Non-Guaranteed attribute in the Misc. section on the Order Ticket for a particular order
• Method 2 - Users can add the Non-Guaranteed column to the Order Management section of the TWS

Notes:

• Non-Guaranteed combination orders are not available for Financial Advisor allocation orders

The risk of such 'Non-Guaranteed' orders is illustrated through the example below:

Example

Assume the following quotes for a Stock vs. Stock combination order to purchase shares of Microsoft (MSFT) and sell shares of Appl (AAPL).

Current markets

MSFT - 26.30 bid, 26.31 offer
AAPL - 250.25 bid, 250.30 offer

A generic combination is created to buy 1 share AAPL and sell 1 share MSFT, the implied quote would be 223.94 bid, 224 offer.

The following order is entered:
Buy 200 AAPL, Sell 200 MSFT
Pay 224

Based on the current markets, the order would appear to be executable.

• A buy of 200 shares of AAPL are routed with a 250.30 limit. Only 100 execute.
• A sell of 200 shares of MSFT are routed with a 26.30 limit. No execution is received as the market moves to 26.29 bid.

With a Non-Guaranteed combination, the 100 shares of AAPL would be placed in the client account, even though no MSFT shares were executed.  The remainder of the combination order will continue to work until executed in its entirety or until it is canceled.

Position limits are defined on regulatory websites and may change periodically.  Some contracts also have near-term limit requirements (near-term position limits are applied to the side of the market for those contracts that are in the closest expiring month issued).  Traders are responsible for monitoring their positions as well as the defined limit quantities to ensure compliance.  The following information defines how position limits are calculated;

Option position limits are determined as follows:

• Bullish market direction -- long call & short put positions are aggregated and quantified in terms of equivalent shares of stock.

• Bearish market direction -- long put & short call positions are aggregated and quantified in terms of equivalent shares of stock.

The following examples, using the 25,000 option contract limit, illustrate the operation of position limits:

• Customer A, who is long 25,000 XYZ calls, may at the same time be short 25,000 XYZ calls, since long and short positions in the same class of options (i.e., in calls only or in puts only) are on opposite sides of the market and are not aggregated
• Customer B, who is long 25,000 XYZ calls, may at the same time be long 25,000 XYZ puts. Rule 4.11 does not require the aggregation of long call and long put (or short call and short put) positions, since they are on opposite sides of the market.
• Customer C, who is long 20,000 XYZ calls, may not at the same time be short more than 5,000 XYZ puts, since the 25,000 contract limit applies to the aggregate position of long calls and short puts in options covering the same underlying security. Similarly, if Customer C is also short 20,000 XYZ calls, he may not at the same time have a long position of more than 5,000 XYZ puts, since the 25,000 contract limit applies separately to the aggregation of short call and long put positions in options covering the same underlying security.

Notifications and restrictions:

IB will send notifications to customers regarding the option position limits at the following times:

• When a client exceeds 85% of the allowed limit IB will send a notification indicating this threshold has been exceeded
• When a client exceeds 95% of the allowed limit IB will place the account in closing only. This state will be maintained until the account falls below 85% of the allowed limit. New orders placed that would increase the position will be rejected.

Notes:

Position limits are set on the long and short side of the market separately (and not netted out).
Traders can use an underlying stock position as a "hedge" if they are over the limit on the long or short side (index options are reviewed on a case by case basis for purposes of determining which securities constitute a hedge).
Position information is aggregated across related accounts and accounts under common control.

Definition of related accounts:

IB considers related accounts to be any account in which an individual may be viewed as having influence over trading decisions. This includes, but is not limited to, aggregating an advisor sub-account with the advisor's account (and accounts under common control), joint accounts with individual accounts for the joint parties and organization accounts (where an individual is listed as an officer or trader) with other accounts for that individual.

Position limit exceptions:

Regulations permit clients to exceed a position limit if the positions under common control are hedged positions as specified by the relevant exchange. In general the hedges permitted by the US regulators that are recognized in the IB system include outright stock position hedges, conversions, reverse conversions and box spreads. Currently collar and reverse collar strategies are not supported hedges in the IB system. For more detail about the permissible hedge exemptions refer to the rules of the self regulatory organization for the relevant product.

OCC posts position limits defined by the option exchanges.   They can be found here.
http://www.optionsclearing.com/webapps/position-limits

Account holders maintaining positions in American Depository Receipts (ADRs) should note that such securities are subject to periodic fees intended to compensate the agent bank providing custodial services on behalf of the ADR.  These services typically, include inventorying the foreign stocks underlying the ADR and managing all registration, compliance and record-keeping services.

Historically, the agent banks were only able to collect the custody fees by subtracting them from the ADR dividend, however, as many ADRs do not regularly pay dividends, these banks have been unable to collect their fees.  As a result, in 2009, the Depository Trust Company (DTC) received SEC approval to begin collecting these custody fees on behalf of the banks for ADRs which do not pay periodic dividends.  DTC collects these fees from its participant brokers (such as IB) who hold the ADRs for their clients.  These fees are referred to as pass-through fees as they are designed to be then collected by the broker from its clients.

If you hold a position in a dividend paying ADR, these fees will be deducted from the dividend as they have in the past.  If you hold a position in an ADR which does not pay a dividend, this pass-through fee will be reflected on the monthly statement of the record date in which it is assessed.  Similar to the treatment of cash dividends, IB will attempt to reflect upcoming ADR fee allocations within the Accruals section of the account statements as well. Once charged, the fee will be reflected in the Deposits & Withdrawals section of the statement with the description 'Adjustments - Other' along with the symbol of the particular ADR it is associated with.

While the amount of this fee will generally range from $0.01 - $0.03 per share, the amounts may differ by ADR and it is recommended that you refer to your ADR prospectus for specific information.  An on-line search for the prospectus may be conducted through the SEC's EDGAR Company Search tool.

This is the pertinent information traders should know about odd lot orders:

• An odd lot is a number of shares less than 100 (1-99)
• A "Round Lot" is 100 shares of stock
• Any number of shares that is a multiple of 100 is a round lot (i.e. 100, 600, 1,600, etc)
• An order for a number of shares greater than 100, but not a multiple of 100 (i.e. 142, 373, 1,948, etc) is a "Mixed Lot" (AKA PRL, or partial round lot, order)
• Odd-Lot orders are not posted to the bid/ask data on exchanges
• Odd-Lot orders are taken into the order book at the exchange they are routed to.  When the exchange is able to match an order from the other side of the book with the odd-lot, it will be filled.  This could lead to delay on execution of an odd-lot. 
• There are numerous guidelines for the routing of odd-lot orders:  Odd-Lot orders to initiate positions will not be routed to primary exchanges; Odd-Lot orders can be routed to primary exchanges, but only if the order in question is to close out a preexisting position; IB will not direct-route odd-lot orders which initiate positions to primary exchanges, therefore these type of orders should be Smart Routed so that IB's routing system can send the order to an ECN for execution.  The exception is that odd lots can be routed to NYSE/ARCA/AMEX, but only as part of a basket order or as a market-on-close (MOC) order.
• A mixed lot or 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).  If the order is direct-routed to NYSE/ARCA, only the round lot portion of the order will be submitted and, if it is executed, the IB system will cancel the remaining odd-lot portion of the order.  If the order is routed via IB Smart Routing, all market centers are eligible to receive the order according to the Smart Routing logic (including NYSE/ARCA, but only for the round lot portion of the order).
• IB will not route odd-lot orders for HOLDRS.  The odd-lot portion of a PRL order for HOLDRS will be rejected by the IB system after the round lot portion of the order is executed.
• Individual exchanges may impose certain restrictions on odd lot orders, in addition to any of the restrictions mentioned above