美国财政部拍卖六周期国债，得标利率4.225%（5月27日为4.235%），投标倍数3.44（前次报3.00）。

Core Insights - The U.S. Treasury auctioned six-month Treasury bills with a winning yield of 4.225%, slightly down from 4.235% on May 27 [1] - The bid-to-cover ratio was 3.44, indicating strong demand compared to the previous auction's ratio of 3.00 [1] Summary by Category - Auction Results - Winning yield for six-month Treasury bills was 4.225% [1] - Previous auction yield was 4.235% on May 27 [1] - Demand Indicators - Bid-to-cover ratio was 3.44, showing increased demand [1] - Previous bid-to-cover ratio was 3.00 [1]