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SIE: Debt Securities
SIE practice questionhardCMOs

Which CMO tranche is most exposed to prepayment risk?

  1. APlanned amortization class (PAC)
  2. BSupport (companion) tranche✓ Correct answer
  3. CZ-tranche
  4. DInterest-only (IO) tranche
Explanation

Why BSupport (companion) tranche

Support tranches absorb excess prepayments, making them most exposed. PACs are protected, Z-tranches get residual payments, and IOs are structured differently.

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