Foreign buyers continued to increase their holdings of U.S. Treasury securities for a fifth straight month in December, even though the two largest holders of U.S. public debt trimmed their shares, U.S. Treasury Department said Tuesday. The total foreign holdings rose to 5.79 trillion U.S. dollars in December, up 1.4 percent from that in November, showed the Treasury International Capital report. The figure surpassed the all-time high hit in March of 5.73 trillion dollars. China, the largest foreign buyer of the Treasury debt, trimmed its holdings by 47.8 billion dollars to 1.27 trillion dollars in December, its first reduction in the past four months, the report showed. Japan, the second largest holder, sold 3.9 billion dollars to 1. 18 trillion dollars in December, according to the figures. Foreign holdings of U.S. national debt have dropped from April to July but have risen since then.