The Repo Trade Lifecycle and the GMRA
A repo is legally a sale and a promise to buy back, not a loan — and the Global Master Repurchase Agreement is the single contract that lets two parties trade that way thousands of times without renegotiating the legal terms each time.
Prerequisites: Repo and Reverse Repo, The Money Market and the Short End of the Curve
Two counterparties who repo Treasuries with each other every day do not draft a new contract for every trade. They sign one master agreement once, and every trade after that is just a one-line confirmation referencing it. That master agreement is the Global Master Repurchase Agreement (GMRA), and it is what turns "sell now, buy back later" into a standardized, repeatable money-market instrument rather than a bespoke legal negotiation each time.
The GMRA is the legal skeleton underneath every repo trade: it defines what a "sale and repurchase" legally means, what happens if a counterparty defaults mid-trade, and how margin gets exchanged — so that the daily trade itself can be agreed in seconds over a screen.
The lifecycle, trade by trade
A repo runs through the same stages regardless of size or term. First, negotiation: the two desks agree collateral type, term, rate, and price over a screen or voice line. Second, confirmation: a trade ticket is generated referencing the GMRA already on file, so no new legal document is needed. Third, settlement of the start leg: the seller delivers securities versus cash, typically through Fedwire or Euroclear, on a delivery-versus-payment basis so neither side is ever exposed to the other without receiving value at the same instant. Fourth, margining during the term: if the collateral's market value moves, the GMRA requires the losing side to post variation margin, keeping the trade collateralized throughout its life. Fifth, the repurchase leg: at maturity the original seller buys the securities back at the agreed repurchase price, which embeds the interest.
Worked example
A dealer repos $50 million of Treasuries overnight at 5.30%. Interest owed is , i.e. $7,361.11. The repurchase price the next morning is $50,007,361.11 — the "interest" never appears as a labeled line item, it is simply built into the difference between the sale price and the repurchase price.
What happens on default
The GMRA's most important clause is what triggers on a counterparty default. Instead of unwinding trades one at a time, the non-defaulting party can close out every outstanding repo with that counterparty at once, netting all the mark-to-market values into a single sum owed either way. This single-netting mechanism is why a dealer with hundreds of open repos against one counterparty has one net exposure number, not hundreds of separate legal claims to chase through bankruptcy court.
A repo looks like a secured loan economically, but under the GMRA it is legally a sale and repurchase of title to the securities. That distinction matters in a default: the non-defaulting party is exercising an ownership right over collateral it already legally owns, not foreclosing on a pledge — which is exactly why repo can close out so much faster than a secured loan can.
Related concepts
Practice in interviews
Further reading
- International Capital Market Association, 'GMRA 2011 and Legal Opinions'
- Federal Reserve Bank of New York, 'Repo and the Money Market'