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Price Portfolio of Bond and Bond Option Instruments

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This example shows the workflow to create and price a portfolio of bond and bond option instruments. You can use finportfolio and pricePortfolio to price FixedBond, FixedBondOption, OptionEmbeddedFixedBond, and FloatBond instruments using an IRTree pricing method.

Create ratecurve Object

Create a ratecurve object using ratecurve. 

Settle = datetime(2018, 1, 1);
 ZeroTimes = calyears(1:4)';
 ZeroRates = [0.035; 0.042147; 0.047345; 0.052707];
 ZeroDates = Settle + ZeroTimes;
 Compounding = 1;
 ZeroCurve = ratecurve("zero",Settle,ZeroDates,ZeroRates, "Compounding",Compounding)
ZeroCurve = 
  ratecurve with properties:

                 Type: "zero"
          Compounding: 1
                Basis: 0
                Dates: [4x1 datetime]
                Rates: [4x1 double]
               Settle: 01-Jan-2018
         InterpMethod: "linear"
    ShortExtrapMethod: "next"
     LongExtrapMethod: "previous"

Create Bond and Option Instruments

Use fininstrument to create a FixedBond, FixedBondOption, OptionEmbeddedFixedBond, and FloatBond instrument objects. 

CDates = datetime([2020,1,1 ; 2022,1,1]);
CRates = [.0425; .0750];
CouponRate = timetable(CDates,CRates);
Maturity = datetime(2022,1,1);
Period = 1;

% Vanilla FixedBond
VBond = fininstrument("FixedBond",'Maturity',Maturity,'CouponRate',0.0425,'Period',Period,'Name',"vanilla_fixed") 
VBond = 
  FixedBond with properties:

                  CouponRate: 0.0425
                      Period: 1
                       Basis: 0
                EndMonthRule: 1
                   Principal: 100
    DaycountAdjustedCashFlow: 0
       BusinessDayConvention: "actual"
                    Holidays: NaT
                   IssueDate: NaT
             FirstCouponDate: NaT
              LastCouponDate: NaT
                   StartDate: NaT
                    Maturity: 01-Jan-2022
                        Name: "vanilla_fixed"


 % Stepped coupon bond
SBond = fininstrument("FixedBond",'Maturity',Maturity,'CouponRate',CouponRate,'Period',Period,'Name',"stepped_coupon_bond") 
SBond = 
  FixedBond with properties:

                  CouponRate: [2x1 timetable]
                      Period: 1
                       Basis: 0
                EndMonthRule: 1
                   Principal: 100
    DaycountAdjustedCashFlow: 0
       BusinessDayConvention: "actual"
                    Holidays: NaT
                   IssueDate: NaT
             FirstCouponDate: NaT
              LastCouponDate: NaT
                   StartDate: NaT
                    Maturity: 01-Jan-2022
                        Name: "stepped_coupon_bond"


% FloatBond
Spread = 0;
Reset = 1;
Float = fininstrument("FloatBond",'Maturity',Maturity,'Spread',Spread,'Reset', Reset,...
                      'ProjectionCurve',ZeroCurve,'Name',"floatbond")
Float = 
  FloatBond with properties:

                      Spread: 0
             ProjectionCurve: [1x1 ratecurve]
                 ResetOffset: 0
                       Reset: 1
                       Basis: 0
                EndMonthRule: 1
                   Principal: 100
    DaycountAdjustedCashFlow: 0
       BusinessDayConvention: "actual"
          LatestFloatingRate: NaN
                    Holidays: NaT
                   IssueDate: NaT
             FirstCouponDate: NaT
              LastCouponDate: NaT
                   StartDate: NaT
                    Maturity: 01-Jan-2022
                        Name: "floatbond"


% Call option
Strike = 100;
ExerciseDates = datetime(2020,1,1); 
OptionType ='call';
Period = 1;
CallOption = fininstrument("FixedBondOption",'Strike',Strike,'ExerciseDate',ExerciseDates,...
                   'OptionType',OptionType,'ExerciseStyle',"american",'Bond', VBond,'Name',"fixed_bond_option")    
CallOption = 
  FixedBondOption with properties:

       OptionType: "call"
    ExerciseStyle: "american"
     ExerciseDate: 01-Jan-2020
           Strike: 100
             Bond: [1x1 fininstrument.FixedBond]
             Name: "fixed_bond_option"


% Option for embedded bond (callable bond)
CDates = datetime([2020,1,1 ; 2022,1,1]);
CRates = [.0425; .0750];
CouponRate = timetable(CDates,CRates);
StrikeOE = [100; 100];
ExerciseDatesOE = [datetime(2020,1,1); datetime(2021,1,1)];
CallSchedule =  timetable(ExerciseDatesOE,StrikeOE,'VariableNames',{'Strike Schedule'}); 
CallableBond = fininstrument("OptionEmbeddedFixedBond", 'Maturity',Maturity,...
                              'CouponRate',CouponRate,'Period', Period, ...
                              'CallSchedule',CallSchedule,'Name',"option_embedded_fixedbond")
CallableBond = 
  OptionEmbeddedFixedBond with properties:

                  CouponRate: [2x1 timetable]
                      Period: 1
                       Basis: 0
                EndMonthRule: 1
                   Principal: 100
    DaycountAdjustedCashFlow: 0
       BusinessDayConvention: "actual"
                    Holidays: NaT
                   IssueDate: NaT
             FirstCouponDate: NaT
              LastCouponDate: NaT
                   StartDate: NaT
                    Maturity: 01-Jan-2022
                   CallDates: [2x1 datetime]
                    PutDates: [0x1 datetime]
                CallSchedule: [2x1 timetable]
                 PutSchedule: [0x0 timetable]
           CallExerciseStyle: "american"
            PutExerciseStyle: [0x0 string]
                        Name: "option_embedded_fixedbond"

Create HullWhite Model

Use finmodel to create a HullWhite model object.

VolCurve = 0.01;
AlphaCurve = 0.1;

HWModel = finmodel("hullwhite",'alpha',AlphaCurve,'sigma',VolCurve)
HWModel = 
  HullWhite with properties:

    Alpha: 0.1000
    Sigma: 0.0100

Create IRTree Pricer for HullWhite Model

Use finpricer to create an IRTree pricer object for a HullWhite model and use the ratecurve object for the 'DiscountCurve' name-value pair argument.

HWTreePricer = finpricer("IRTree",'Model',HWModel,'DiscountCurve',ZeroCurve,'TreeDates',ZeroDates)
HWTreePricer = 
  HWBKTree with properties:

             Tree: [1x1 struct]
        TreeDates: [4x1 datetime]
            Model: [1x1 finmodel.HullWhite]
    DiscountCurve: [1x1 ratecurve]

Create finportfolio Object and Add Callable Bond Instrument

Create a finportfolio object with the vanilla bond, stepped coupon bond, float bond, and the call option. 

myportfolio = finportfolio([VBond,SBond,Float,CallOption],HWTreePricer, [1,2,2,1])
myportfolio = 
  finportfolio with properties:

    Instruments: [4x1 fininstrument.FinInstrument]
        Pricers: [1x1 finpricer.irtree.HWBKTree]
    PricerIndex: [4x1 double]
       Quantity: [4x1 double]

Use addInstrument to add the callable bond instrument to the existing portfolio.

myportfolio = addInstrument(myportfolio,CallableBond,HWTreePricer,1)
myportfolio = 
  finportfolio with properties:

    Instruments: [5x1 fininstrument.FinInstrument]
        Pricers: [1x1 finpricer.irtree.HWBKTree]
    PricerIndex: [5x1 double]
       Quantity: [5x1 double]


myportfolio.PricerIndex
ans = 5×1

     1
     1
     1
     1
     1

The PricerIndex property has a length equal to the length of instrument objects in the finportfolio object and stores the index of which pricer is used for each instrument object. In this case, because there is only one pricer, each instrument must use that pricer.

Price Portfolio

Use pricePortfolio to compute the price and sensitivities for the portfolio and the bond and option instruments in the portfolio.

format bank
[PortPrice,InstPrice,PortSens,InstSens] = pricePortfolio(myportfolio)
PortPrice = 
        600.55


InstPrice = 5×1

   96.5943
  204.1377
  200.0000
    0.0487
   99.7738


PortSens=1×4 table
    Price      Vega      Gamma      Delta  
    ______    ______    _______    ________

    600.55    -63.40    5759.65    -1297.48


InstSens=5×4 table
                                 Price      Vega      Gamma      Delta 
                                 ______    ______    _______    _______

    vanilla_fixed                 96.59     -0.00    1603.49    -344.81
    stepped_coupon_bond          204.14      0.00    3364.60    -725.96
    floatbond                    200.00     -0.00      -0.00       0.00
    fixed_bond_option              0.05     12.48      24.15      -3.69
    option_embedded_fixedbond     99.77    -75.88     767.41    -223.03

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