A synthetic structure that consists of a single tranche. It is simpler than a standard synthetic tranche and can be customized to an investor’s preferences. With a customized monotranche, only one tranche of the structure, usually a mezzanine tranche, is sold to investors, while the arranger becomes the direct counterparty to the transaction since the structure involves no SPV. This allows the seller to meet investors’ needs in terms of customization and cost considerations. Unlike conventional tranches, customized monotranches don’t requires that all the different classes of tranches (equity, mezzanine, senior) be sold for a transaction to complete. This instrument was introduced in 2003 a a more flexible alternative to conventional collateralized debt obligations (CDOs).

A customized monotranche is also known as a bespoke tranche, a bespoke CDO, a single-tranche CDO or for short as an STCDO.