medium · Asset-Backed Securities tranching

An originator closes a $100,000,000 deal with 0 initial OC and a target OC of 2.50% of the initial balance. The pool amortizes at 2.00% per month (scheduled principal) with a 10% CPR (prepayment).

If the annual net excess spread is 6.00%, why does pool amortization make reaching the target OC more difficult over time?

  1. Amortization steadily increases the required dollar amount of the target OC
  2. The dollar amount of excess spread generated each month declines as the pool shrinks
  3. Scheduled principal collections are diverted into the interest waterfall during amortization
  4. High prepayment speeds trigger an immediate release of accumulated OC to the residual equity holder

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