Cash Treasury Trades Must Clear Centrally From December 31. The SEC Has Said It Does Not Intend to Extend Again.

The largest government bond market in the world has been settling most of its trades bilaterally. From December 31, a defined set of those trades has to go through a clearing house instead. The deadline is four months away and the SEC has said on the record that it does not plan to move it again.

The two dates

• December 31, 2026 — eligible cash market Treasury transactions
• June 30, 2027 — eligible repo transactions

Both sit in Rule 17ad-22(e)(18)(iv)(A) and (B), which requires covered clearing agencies for Treasury securities to have policies bringing their members' eligible activity into central clearing. The SEC pushed each date back by a year on February 25, 2025, and paired the extension with temporary relief on the margin provision in Rule 17ad-22(e)(6)(i) that ran to September 30, 2025.

What central clearing changes

In a bilateral trade, each side carries the other's credit risk until settlement. Central clearing puts a clearing house between them, so each side faces the clearing house rather than the counterparty, and the clearing house collects margin against the exposure. That is the mechanism; the mandate decides which trades have to use it.

What has been built since the extension

An April 2026 SEC statement lists the pieces put in place while the clock ran:

• Registration of two new clearing agencies, CME Securities Clearing, Inc. and ICE Clear Credit LLC
• Approval of customer cross-margining between cash Treasury and futures positions
• FICC rule changes including a collateral-in-lieu model and an expanded triparty repo agent clearing service
• Publication of exemptive petitions from SIFMA, on inter-affiliate transactions and activity-based thresholds for certain non-U.S. affiliate repo activity, and from the IIB, on transactions between non-U.S. institutions

The size of the thing being moved

The SEC describes the Treasury market as having nearly $29 trillion outstanding, with daily volume above $1 trillion, and calls it the deepest and most liquid government securities market in the world. The mandate does not apply to all of that; it applies to the categories of transaction the rule defines as eligible.

Why it matters

Central clearing changes where risk sits and how much collateral has to be posted against it. Those are structural costs that land on dealers, hedge funds and asset managers active in Treasuries, and they are being introduced on a fixed date rather than phased in by volume. Four months out, the SEC's position is that the date holds.