I am not able to make quantlib match bloomber price, maybe I don't use the right parameters into ql.Schedule or ql.FixedRateBond

I have a price of : 90.012 instead of 93.508 [Huge spread between my result and bloomberg]

Below is the reproducible example :

import QuantLib as ql

todaysDate= ql.Date(2,6,2023)


# Market conventions
calendar = ql.UnitedStates(ql.UnitedStates.GovernmentBond)
settlementDays = 2
faceValue = 100
compounding = ql.Compounded
compoundingFrequency = ql.Semiannual

# Bond schedule setup
issueDate = ql.Date(15, 5, 2019)
maturityDate = ql.Date(15, 5, 2029)
tenor = ql.Period(ql.Semiannual)
schedule = ql.Schedule(issueDate, maturityDate, tenor, calendar, 
                    ql.Unadjusted, ql.Unadjusted, ql.DateGeneration.Backward, False)

# Bond parameters
rate = 3.5/100
dayCount = ql.Thirty360(ql.Thirty360.BondBasis)
bond = ql.FixedRateBond(settlementDays, faceValue, schedule, [rate], dayCount)

# YTM calculation
yieldRate = 4.767131/100  # YTM
yieldDayCount = ql.Thirty360(ql.Thirty360.BondBasis)
yieldCompoundingFrequency = ql.Semiannual
cleanPrice = bond.cleanPrice(yieldRate, yieldDayCount, compounding, 
                             yieldCompoundingFrequency, issueDate)

print("The clean price of the bond is: ", cleanPrice)

Bond DES and YASQ enter image description here enter image description here

Can someone help me to understand what I am doing wrong ?

Side Note :

I have seen this answer but it seems that my issue is something else.

  • 3
    $\begingroup$ Why are you passing issueDate to bond.cleanPrice, nstead of the valuation date? $\endgroup$ Commented Jun 2, 2023 at 17:09
  • $\begingroup$ @DimitriVulis it seems that it is one of my mistake indeed, but I might have done some other mistakes since I don't match BBG price. $\endgroup$
    – TourEiffel
    Commented Jun 5, 2023 at 7:32
  • $\begingroup$ @DimitriVulis I think one of my other mistake is compounding = ql.Compounded wich should be compounding = ql.SimpleThenCompounded do you have an idea why ? $\endgroup$
    – TourEiffel
    Commented Jun 5, 2023 at 8:04
  • $\begingroup$ Did you reconcile your bond's cashflows between Quantlib and Bloomberg CSHF? $\endgroup$ Commented Jun 8, 2023 at 12:05


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