The 10-year U.S. Treasury yield collapsed 15 basis points to 4.12 percent today following the Treasury Department's announcement of a targeted buyback program for off-the-run securities. The two-year fell seven basis points to 4.82 percent as bid-ask spreads on longer-dated maturities compressed sharply.

The intervention directly addressed liquidity deterioration in off-the-run issues, where institutional investors and pension funds faced acute duration risk. The program signals Treasury confidence in its ability to manage market infrastructure without requiring the Federal Reserve to slow its quantitative tightening.

Spread compression between on-the-run and off-the-run issues tightened measurably, restoring depth to a market that had shown signs of fragmentation. The move reduces immediate pressure on portfolio managers who had been managing wider bid-ask costs on longer maturities.

Equities rose on the improved fixed-income backdrop. The S&P 500 gained 0.2 percent to 7,708, the Dow Jones Industrial Average rose 0.2 percent to 53,463, and the Nasdaq climbed 0.2 percent to 26,331. The dollar index retreated as risk appetite returned.

Bond traders will watch the Consumer Price Index report scheduled for next Tuesday and the Federal Reserve's policy meeting concluding Sept. 20. Inflation trajectory remains the central variable for long-end stability.