US Treasury doubles down on buybacks to tame surging long-dated bond yields

The US Treasury just pulled one of the bigger levers in its toolkit. On August 19, the department announced it would at least double the maximum size of its liquidity-support buyback operations for longer-dated nominal coupon securities, raising the cap from $2 billion to a minimum of $4 billion per operation. The target: the 10- to 30-year segment of the bond market, where yields have climbed to multi-year highs and demand has thinned out at exactly the wrong time for a government that needs to borrow a lot of money. What the Treasury is actually doing The scaled-up buyback operations will run from September 9 through early November 2026, covering both the 10- to 20-year and 20- to 30-year sectors. These aren’t new debt purchases in the traditional sense. Liquidity-support buybacks involve the Treasury repurchasing older, less-traded “off-the-run” securities. The goal is to reduce market dislocation and improve trading conditions, not to finance new spending. The move builds on a quarterly buyback schedule released just two weeks earlier, which had already earmarked up to $38 billion in liquidity-support buybacks for the quarter. Doubling the per-operation cap represents a meaning...