CME Group is timing its entry into cash Treasury clearing for the final weeks before the SEC mandate, opening a new clearing revenue line and extending the margin economics around its interest-rate futures franchise. CME Securities Clearing will begin operating on 7 December, 24 days before covered cash Treasury transactions become subject to the central-clearing requirement. CME Targets Mandated Clearing Flows The SEC requires covered clearing agencies’ direct participants to submit eligible secondary-market Treasury transactions for central clearing from 31 December 2026. The corresponding deadline for repo and reverse-repo transactions is 30 June 2027, following a one-year extension granted by the regulator. CME Securities Clearing received SEC registration in December 2025. Its launch was initially expected during the second quarter of 2026 and was subsequently moved to the third quarter before CME set the December date. The timing puts the launch just ahead of a regulatory change expected to route substantially more Treasury activity through central counterparties.CME Chairman and CEO Terry Duffy also pointed to total US federal debt exceeding $40 trillion when describing the scale of the market transition. Linking Treasuries with CME Futures Apart from processing cash securities and repo trades, the new service is designed to offer margin offsets across Treasuries, repo and CME interest-rate futures, reducing the need to fund each exposure separately.The exchange operator already has a cross-margining arrangement with the Fixed Income Clearing Corporation, allowing eligible Treasury positions cleared at FICC to offset interest-rate futures held at CME. According to the group, the programme currently generates more than $2 billion in daily margin savings.Access was expanded to end-user clients in April 2026 after previously focusing on clearing members’ proprietary accounts.FICC Remains the Scale BenchmarkCME Securities Clearing will add another route for recognising offsets within the group’s own cash and derivatives infrastructure, with the existing FICC arrangement continuing in parallel.The clearing house will support done-with clearing, where the same intermediary handles execution and clearing, and done-away transactions, where a trade is executed with one counterparty and routed through another clearing agent.This separates the choice of execution venue from the clearing relationship. FICC still clears most Treasury and repo activity. ICE Clear Credit became the first alternative provider when its cash Treasury service went live in February. A July FICC survey found that 79% of responding netting members had the required account structures in place. More than $1.2 trillion of daily cash Treasury activity was already being cleared at FICC, with an estimated $300 billion to $400 billion still to migrate. However, the accompanying report said meaningful implementation work remained.This article was written by Tanya Chepkova at www.financemagnates.com.