Why did a bigger Treasury buyback fail to lower yields?

The Treasury said it would buy up to $6 billion of bonds maturing in 10 to 20 years, three times the size of its previous long-dated operation, to support market liquidity.[4] Investors had expected a larger intervention, and the benchmark 10-year yield subsequently reached 4.901%, its highest level since 2023.[2][4] Why it matters: Treasury yields serve as reference rates across the US economy, so sustained increases can make mortgages and business loans more expensive, slow growth and weigh on share prices.[4] The reaction also illustrates the limited ability of liquidity-focused buybacks to counter inflation, deficits and broader macroeconomic pressures on long-term rates.[2][4] Key insights: The buyback was designed to maintain liquidity after the 30-year yield reached its highest level in nearly two decades.[4] | Analysts linked rising yields to high oil prices, AI investment and increased federal borrowing associated with the budget deficit.[4] | The Treasury’s effort to restrain yields sits uneasily beside the Federal Reserve’s attempt to control persistent inflation.[4] | A promised $5,000 payout to adult US citizens if Republicans retain Congress added fiscal-policy uncertainty before a 30-year bond auction.[5] Cheatsheet facts: What changed: Treasury offered to repurchase up to $6 billion of 10- to 20-year debt, but long-term yields rose rather than fell.[2][4] | Why now: Investors are balancing limited liquidity support against inflation pressure, high oil prices and heavy government borrowing.[4] | Watch next: Watch demand and pricing at the approaching 30-year Treasury auction, alongside Friday’s US consumer-inflation release.[4][5]