Senior Tranche Protection
Senior tranche protection refers to the structural seniority that gives specific portions of a collateralized debt obligation priority in receiving cash flows from the underlying assets. These tranches are the last to absorb losses, meaning they only suffer a financial hit after the junior and mezzanine tranches have been completely wiped out.
Because of this structural hierarchy, senior tranches typically carry the lowest risk and therefore offer the lowest yields to investors. They are often structured to be investment-grade, even if the underlying collateral includes lower-rated assets.
This protection is essentially a form of internal credit enhancement built into the architecture of the derivative. Investors in senior tranches are primarily concerned with the total volume of defaults rather than the timing of those defaults.