A report by Reuters shows that the Bank of Japan's holdings of government debt rose to a record during October to December of 2017

BOJ held a record of ¥449 trillion (equivalent to $4.24 trillion) in government debt at the end of December. That is up 6.9% y/y, while the BOJ also held 41.1% of all government debt - another record based on data measured by the central bank themselves.

Although the BOJ has slowed the pace of government debt purchases, the size of the holdings on its balance sheet continues to grow - and it's something that threatens to damage the market, if it hasn't already.

Not exactly the kind of news that bond traders in Japan will welcome to start off the week.