The Bank of Japan is taking a stealthier approach than its peers to winding back pandemic stimulus without rattling markets.

As the BOJ, U.S. Federal Reserve and others convene meetings this week, Japan's central bank is, on some fronts, already ahead of the pack after sharply cutting back purchases of exchange traded funds and trimming its buying of corporate bonds.

The ETF move was flagged after the fact in March. The scaling back of corporate debt purchases already underway could be formally announced Friday.