There were lots of buying by China, lots of buying by Japan.
Japan, however, had been selling Treasuries for most of 2022 to help boost a weak yen.
China had been selling Treasuries as well, like Japan for most of last year.
U.S. residents, meanwhile, increased their holdings of long-term foreign securities, with net purchases of $22.8 billion, compared with net selling of $8.3 billion in February.
Overall, net foreign purchases of long-term securities are estimated to have been $133.3 billion in March, up sharply from February's inflows of $56.6 billion, data showed.