Securities Financing & Repo Desk (Tri-Party) — impact tolerance ≤ 1 hour — ITOL

Impact tolerance: ≤ 1 hour — during tri-party unwind/roll and new-trade settlement windows at BNY, when the day's maturing trades must be rolled or replaced. Outside those windows the constraint relaxes toward same-day, but the book matures again tomorrow (illustrative default — trace the derivation, then replace with your own harm analysis)

Definition: Fund the bank's securities inventory and short-term balance sheet through the tri-party repo market: roll the maturing book, price and book new trades with cash investors, instruct collateral allocations to the tri-party agent (BNY), and manage bilateral DVP (delivery-versus-payment) legs and GCF (General Collateral Finance) repo legs cleared through FICC, the Fixed Income Clearing Corporation. Sits beside liquidity-funding-ops in the same funding chain. That service moves the master account. This one keeps ≈ $35B of secured funding rolling every day. Applies only where the bank runs a dealer-scale securities-financing book. A super-regional funding itself through deposits and FHLB (Federal Home Loan Bank) advances alone would map repo as a treasury dependency, not a standalone IBS (important business service).

Why it is designated: The binding clock is the tri-party settlement window itself. Post-reform, the market runs without the clearing-bank intraday credit that once papered over a slow participant. Maturing trades and new trades settle against each other in a window later in the trading day. A borrower that cannot instruct allocations inside that window simply does not roll. With ≈ $35B rolling daily, an unrolled book is not a service degradation. It is a same-day secured-funding gap the contingency funding plan must fill at market speed, in public view of the money funds who decide tomorrow's book. The tolerance is one hour because the instruction cutoffs sit inside windows measured in hours. A longer number assumes grace the settlement process no longer extends.