Markets spent this week arguing about the 10-year yield and a buyback programme that underwhelmed. The more consequential date in the Treasury market is not a Fed meeting: it is 31 December 2026, when the SEC's clearing rule requires eligible cash US Treasury transactions to be submitted to a central counterparty, with eligible repo following on 30 June 2027. The rule was adopted in December 2023 and the compliance dates were pushed back by a year in early 2025. That extension is why almost nobody is positioned for it, and why it now lands inside a normal investment horizon.
The mechanics matter more than the headline. Today a very large share of US Treasury repo, well over $2tn a day, is negotiated bilaterally between a dealer and a client and never touches a clearing house. Under the mandate that trade has to arrive at a CCP, which means it needs a clearing member or a sponsor, a legal agreement, an onboarding project, daily margin, and somewhere to source and move the collateral that margin is made of. None of that exists yet for thousands of hedge funds, money market funds, insurers and non-bank dealers. The record size of the Treasury float, the same size that makes buyback plans a talking point, sets the volume that flows through this new pipe every night.