The same story applies to the official sector as a whole. Central banks sold $26.2b of long-term Treasuries, but added $66.6b to their short-term Treasury holdings. Net central bank holdings of Treasuries — judging from the TIC data — rose by $40.4b. That is consistent with the $49.1b rise in the Fed’s custodial holdings of Treasuries. Central banks by contrast are reducing their holdings of short-term and long-term Agencies. They sold $14.3b of long-term Agencies, and their short-term holdings likely fell by a comparable amount.**
Selling long dated treasuries in exchange for short dated Treasuries is a sign that they think interest rates will rise in the near future. Otherwise the move does not make any sense at all in this environment. What do they know that we do not?