<i>At an estimated 8.6 trillion yen as of March, the BOJ’s holdings amount to about 1.6 percent of the total capitalization of all companies listed in Japan. That compares with about 5 percent held by the nation’s Government Pension Investment Fund. The central bank’s use of large-cap ETFs means its positions are concentrated, with less impact on the thousands of Japanese companies outside benchmark indexes.</i><p>Some additional context, from the article. This is not really a big deal. Unusual, but not crazy.