U.S. stocks ended modestly higher Wednesday as long-term Treasury yields fell sharply. The S&P 500 rose 16.22 points, or 0.21%, to 7,707.98, ending a three-session losing streak. The Dow Jones Industrial Average gained 119.65 points, or 0.22%, to close at 53,463.05. The Nasdaq Composite added 41.38 points, or 0.16%, finishing at 26,331.09. Falling government bond yields helped major indexes recover after several sessions of pressure from rising borrowing costs. Bond prices climbed after the U.S. Treasury Department announced larger liquidity support buybacks for longer-dated government debt. Starting September 9, the maximum purchase size will increase from $2 billion to at least $4 billion per operation. The change covers nominal coupon securities in the 10-to-20-year and 20-to-30-year maturity sectors. The increased amounts will remain in effect through November 4. The department said strong volumes of high-quality offers supported the decision to increase liquidity operations in those sectors.