|
The first stage of the strategy works by taking a repo loan using U.S. treasuries as collateral with matching terms. For example, a 6-month maturity U.S. Treasury would be financed with a 6-month maturity repo loan. Once the asset-backed repo loan is in place the second stage of the strategy is to make an unlimited number of collateral substitutions of the treasury asset which is allowable under the Master Repo Agreement. Substitutions are only made on higher-yielding assets and are done as frequently as possible. This type of arbitrage trade results in only positive gains as the substitution trade is only made with higher-yielding assets. If higher-yielding assets are not available at a given time, no substitution is made.
One important trading rule of the strategy is that any substituted Treasury cannot have a maturity that is more than 16 days shorter or 16 days longer than the repo maturity. A collateral substitution is never executed unless the term is within 16 days of the repo and it has a higher yield. As the maturity of both the asset and liability will always have the same term within +/- 16 days, their modified durations will be about the same and
their market values will move about the same amount given a move up or down in their yields. Since the yields of the treasury and the repo loan move together, they are not subject to price spread. The maximum maturity is 12 months. The weighted average portfolio maturity of between 4 to 6 months. Only highly liquid U.S.treasuries under 12 months are used for collateral.
Collateral swaps are executed simultaneously with the same single counterparty to minimize counterparty risk. All treasury positions are offset every day and no bonds are held except for the term-matched repo portfolio held by the repo provider. Once settled the account accrues positive gains from any substitutions traded that day. All repo transactions are underwritten by the FICC, which is backed by the U.S. government, and also serves to minimize counterparty risk.
|