美国4月外资净买入美国公债 -408亿美元，前值1233亿美元。

Core Viewpoint - In April, foreign net purchases of U.S. Treasury securities amounted to a negative $40.8 billion, a significant decrease from the previous value of $123.3 billion [1] Group 1 - The net foreign investment in U.S. Treasury bonds turned negative in April, indicating a shift in investor sentiment [1] - The previous month's figure of $123.3 billion highlights a stark contrast to the current negative value, suggesting potential concerns regarding U.S. fiscal stability or attractiveness [1]