On May 28, 2024, the standard U.S. settlement cycle shrank from T+2 to T+1 — every stock and corporate bond trade now has to settle in one business day instead of two. The SEC sold it as counterparty-risk reduction: less time between trade and settlement means less exposure if someone defaults mid-transaction. That's true, and it's not the interesting part.
The interesting part is what T+1 does to the plumbing. Cutting the settlement window in half doesn't halve the work — it compresses trade affirmation, FX funding, securities lending recalls, and collateral movement into a window that increasingly can't tolerate manual processes or overnight batch cycles. Asset managers, hedge funds, and broker-dealers now need same-day funding certainty, real-time inventory visibility, and automated collateral optimization that didn't used to matter when everyone had 48 hours of slack. That need doesn't get built in-house by most buy-side firms. It gets bought — as a service — from whoever already runs the biggest, most automated prime brokerage and clearing books. Settlement risk was the headline. Balance-sheet-as-a-service is the business model that wins.