SPAN® Risk Parameter File - Expanded Format

Type "B" Record

Array Calculation Parameters & Delta-Scaling Factors

updated September 24, 2009

Length

From

To

Datatype

Format

Description and Comments

2

1

2

AN

X(2)

Record ID - "B "

3

3

5

AN

X(3)

Exchange Acronym

10

6

15

AN

X(10)

Commodity Code

3

16

18

AN

X(3)

Product Type Code

6

19

24

N

9(6)

Futures Contract Month as CCYYMM

2

25

26

AN

X(2)

Futures Contract Day or Week Code

1

27

27

-

-

Filler

6

28

33

N

9(6)

Option Contract Month as CCYYMM

2

34

35

AN

X(2)

Option Contract Day or Week Code

1

36

36

-

-

Filler

8

37

44

N

9(2)V9(6)

Base Volatility (as a decimal fraction)

8

45

52

N

9(2)V9(6)

Volatility Scan Range (as a decimal fraction)

5

53

57

N

9(5)

Futures Price Scan Range

5

58

62

N

9(2)V9(3)

Extreme Move Multiplier

5

63

67

N

9V9(4)

Extreme Move Covered Fraction

5

68

72

N

9V9(4)

Interest Rate (as a decimal fraction)

7

73

79

N

9V9(6)

Time to Expiration (in years)

6

80

85

N

V9(6)

Lookahead Time (in years)

6

86

91

N

9(2)V9(4)

Delta Scaling Factor

8

92

99

N

9(8)

Expiration (Settlement) Date as CCYYMMDD

10

100

109

AN

X(10)

Underlying Commodity Code

2

110

111

AN

X(2)

Pricing Model

8

112

119

N

9(2)V9(6)

Coupon or Dividend Yield, as a decimal fraction

1

120

120

AN

X(1)

Option Expiration Reference Price Flag -- see note below

7

121

127

N

9(7)

Option Expiration Reference Price

1

128

128

AN

X(1)

Option Expiration Reference Price Sign (+ or -)

14

129

142

N

9(7)V9(7)

Swap Value Factor (for interest-rate swaps) or

Contract-Specific Contract Value Factor (for normal futures and options)

2

143

144

N

9(2)

Swap Value Factor Exponent

1

145

145

AN

X

Sign for Swap Value Factor Exponent (blank, "+" or "-")

2

146

147

N

9(2)

Base Volatility Exponent

1

148

148

AN

X

Sign for Base Volatility Exponent (blank, "+" or "-")

2

149

150

N

9(2)

Volatility Scan Range Exponent

1

151

151

AN

X

Sign for Volatility Scan Range Exponent (blank, "+" or "-")

12

152

163

N

9(2)V9(10)

Discount Factor (for discounting back to present value)

Notes:

  1. "B" records provide delta-scaling factors as well as risk array calculation parameters for either a particular futures contract, or for a particular option series - ie, for all options which are identical except for their put/call code and their strike.
  2. Except for the delta-scaling factors, parameters contained on "B" records are not needed for the SPAN performance bond calculation itself.  If "B" records are not provided for a particular future or option series, the delta-scaling factor for that future or that series should be defaulted to 1.00.
  3. If "B" records are provided, then the "B" records for all products in a combined commodity are typically located in the SPAN file after the "4" record for that combined commodity.
  4. "B" records for a futures contract will contain either zeros or spaces in the Option Contract Month and Option Contract Day fields.
  5. The Option Contract Day or Week Code field is used to distinguish option series which expire at different times than the standard monthly options.  For standard monthly options, this field will contain zeros or blanks.  For other options, this field will typically contain "W1", "W2", etc. - for weekly options expiring in week 1 of the month, week 2 of the month, etc. - or a two-digit day of the month, for flex options or other options for which the exact expiration day is specified.  The Futures Contract Day or Week Code is intended to be used analogously to distinguish futures which expire at different times than standard monthly futures.
  6. The Price Scan Range parameter on the "B" record is in the performance bond currency for the combined commodity and must be multiplied by ten raised to the Risk Exponent power for that combined commodity.  The Risk Exponent is taken from the "2" record.
  7. The Expiration (Settlement) Date for a future is the date on which its final marking price is determined.  The Expiration (Settlement) Date for an option series is the last date on which holders of options in that series can elect to exercise those options.  Time to Expiration is determined by taking the number of calendar days between the Expiration Date and the business date of this SPAN file, and dividing by 365, with zero as a minimum value.
  8. Currently supported values for the Pricing Model code are: B for Black (European futures options), BS for Black-Scholes (European physical options with no dividends), M for the generic Merton European option model, WB for "Whaley Black" (the Adesi-Whaley model for American futures options), WS for "Whaley Scholes" (the Adesi-Whaley model for American physical options with no dividends, WI for "Whaley for Indices" (the generic Adesi-Whaley model), and I for Intrinsic.
  9. Product type codes are PHY for Physical, FUT for Future, CMB for Combination, OOP for Option on Physical, OOF for Option on Future, OOC for Option on Combination.
     
  10. The Option Expiration Reference Price and Price Flag are optional fields which may be provided for "B" records for option series.  These fields provide a means of identifying whether the final price of the underlying for determining automatic exercise of in-the-money options is available, and if so, what that price is.  A value N for this flag means either that the expiration day for this option series has not yet arrived, or it has arrived but that the reference price is not yet available.  A value of Y for the flag means that the expiration day has arrived, that the price is available, and that the price is actually the settlement price for the underlying on that day.  A value of S means that the expiration day has arrived and that the reference price is available, but that this is a special reference price, different from the settlement price of the underlying on that day.  Note that this price will be formatted according to the decimal locator and alignment code for the underlying, not for the option series.
  11. The Discount Factor field in bytes 152-163 provides the value used for discounting mark-to-market values back to present value, for example for forwards.  The numeric format of 9(2)V9(10) is for discount factors as a decimal value.  For example, a discount factor of 98.1234 percent, or 0.981234 as a decimal value, will appear in the field as 009812340000.  Hence the field supports discount factors out to eight decimal places of a percent.