For certain instruments, including Stock Options, we require a margin charge to cover potential losses involved on holding a position in the instrument. Stock Options are treated as full premium style options.
Full premium example:
When acquiring a long position in a full premium option, the premium amount is deducted from the client’s cash balance. The value from an open long option position will not be available for margin trading other than indicated in the margin reduction schemes.
In the following example, a client buys one Apple Inc. DEC 2013 530 Call @ $25 (Apple Inc. stock is trading at $529.85. One option equal 100 shares, buy/sell commissions $6.00 per lot and exchange fee is $0.30. With a cash balance of $10,000.00, his account summary will show:
|
Cash and Position Summary
|
|
Position Value
|
1 * 25 * 100 shares =
|
$2,500.00
|
|
Unrealized Profit/Loss
|
|
--
|
|
Cost to Close
|
- 1* ($6 + $0.30) =
|
- $6.30
|
|
Unrealised Value of Positions
|
|
$2,493.70
|
|
|
|
Cash Balance
|
|
$10,000.00
|
|
Transactions not Booked
|
- ($2,500 + $6.30) =
|
- $2,506.30
|
|
Account Value
|
|
$9,987.40
|
|
|
|
Not Available as Margin Collateral
|
- 1 * 25 * 100 shares =
|
- $2,500.00
|
|
Used for Margin Requirement
|
|
--
|
|
Available for Margin Trading
|
|
$7,487.40
|
In case of a full premium option, the transactions not booked will be added to the client’s cash balance in overnight processing. The next day, when the options market has moved to $41 (spot at 556.50), the account summary will show:
|
Cash and Position Summary
|
|
Position Value
|
1 * 41 * 100 shares =
|
$4,100.00
|
|
Unrealised Profit/Loss
|
|
--
|
|
Cost to Close
|
- 1*($6+$0.30) =
|
-$6.30
|
|
Unrealised Value of Positions
|
|
$4,093.70
|
|
|
|
Cash Balance
|
|
$7,493.70
|
|
Transactions not Booked
|
|
--
|
|
Account Value
|
|
$11,587.40
|
|
|
|
Not Available as Margin Collateral
|
- 1 * 41 * 100 shares =
|
-$4,100.00
|
|
Used for Margin Requirement
|
|
--
|
|
Available for Margin Trading
|
|
$7,487.40
|
Position Value: Increased due to the price of the option being higher.
Unrealised Value of Positions: Increased due to the price of the option being higher.
Cash Balance: Reduced by the price of the option. ‘Transactions not Booked’ is now zero.
Account Value: Increased due to the price of the option being higher.
Not Available as Margin Collateral: Increased due to the new value of the position.
Short Option Margin
A short option position exposes the holder of that position to being assigned to deliver the underlying proceeds when another market participant who holds a long position exercises his option right. Losses on a short option position can be substantial when the market moves against the position. We will therefore charge premium margin to ensure that sufficient account value is available to close the short position and additional margin to cover overnight shifts in the underlying value. The margin charges are monitored in real-time for changes in market values and a stop out can be triggered when the total margin charge for all margined positions exceeds the client’s margin call profile.
The generic formula for the short option margin charge is:
- Short Option Margin = Premium Margin + Additional Margin
The premium margin ensures that the short option position can be closed at current market prices and equals the current Ask Price at which the option can be acquired during trading hours. The additional margin serves to cover overnight price changes in the underlying value when the option position cannot be closed because of limited trading hours.
Stock Options
For options on Stocks, the additional margin equals a percentage of the underlying reference value minus a discount for the amount that the option is out-of-the-money.
- Additional Margin Call = Max (X% * Underlying Spot) – Out-of-the-Money Amount, Y% * Underlying Spot)
- Additional Margin Put = Max (X% * Underlying Spot) – Out-of-the-Money Amount, Y% * Strike Price)
The margin percentages are set by Totality Wealth Limited and are subject to change. The actual values can vary per option contract and are configurable in the margin profiles. Clients can see the applicable values in the trading conditions of the contract.
The out-of-the-money amount for a call option equals:
- Max (0, Option Strike – Underlying Spot)
The out-of-the-money amount for a put option equals:
- Max (0, Underlying Spot Price – Option Strike)
To get the currency amount involved, the acquired values need to be multiplied with the trading unit (100 shares).
Example:
Let’s suppose FORM applied an X margin of 15% and a Y margin of 10% on Apple stocks.
A Client shorts an Apple DEC 2013 535 Call at $1.90 (Apple stock at 523.74). The option figure value is 100 shares. The OTM amount is 11.26 stock points (535 – 523.74), resulting in an additional margin of 67.30 stock points ($6,730). In the account summary, the premium margin is taken out of the position value:
|
Cash and Position Summary
|
|
Position Value
|
- 1 * $1.90 * 100 shares =
|
- $190.00
|
|
Unrealized Profit/Loss
|
|
--
|
|
Cost to Close
|
- (6 + $0.30) =
|
- $6.30
|
|
Unrealized Value of Positions
|
|
- $196.30
|
|
|
|
Cash Balance
|
|
$10,000.00
|
|
Transactions not Booked
|
$190 - ($6 + $0.30) =
|
$183.70
|
|
Account Value
|
|
$9,987.40
|
|
|
|
Not Available as Margin Collateral
|
|
--
|
|
Used for Margin Requirement
|
- 100 shares *( (0.15 * 523.74) – 11.26)
|
- $6,730.00
|
|
Available for Margin Trading
|
|
$3,257.40
|