KEY POINTS

Foreign buying of U.S. corporate bonds picked up as companies issued record debt

In 2016, foreigners held nearly 29 percent of all U.S. corporate debt

Banks, households reduced corporate debt holdings as foreign buying increased

There are no borders when it comes to the hunt for yield, and foreign investors apparently found what they were looking for in the U.S. last year.

After the Federal Reserve began raising rates for the first time in nearly a decade, foreigners rushed to "buy American" in the U.S. corporate debt market in 2016 at the fastest pace in years. Foreign entities now hold almost 29 percent of U.S. corporate bonds, up from 12 percent in 1990, according to Morgan Stanley.