Historically, the biggest winners on the heels of such an event have been Korean, European and U.S. consumer-discretionary stocks.
Japan's central bank has expanded monetary policy 27 times since 1992, including twice this year, according to Kensho.
One month later, the country's benchmark Nikkei 225 index traded positive only about half the time. Bigger and more reliable returns have been found elsewhere. Korea's Kospi index has popped more than 4.5 percent on average, while the biggest European stocks have gained more than 3 percent.
In the U.S., the biggest winner has been the consumer-discretionary sector, which has traded positive about 80 percent of the time after BOJ stimulus announcements.