As investors await a Federal Reserve rate cut as soon as this month, yield-seekers are finding refuge in U.S. exchange-traded funds.

The $19 billion iShares iBoxx High Yield Corporate Bond ETF, known by its ticker HYG, took in more than $622 million on Friday, the largest addition to the fund in a month, data compiled by Bloomberg show. The latest interest in riskier corporate debt follows a pick-up in demand last month, when almost $3 billion poured into the ETF, delivering its best month of inflows on record.

Enthusiasm for speculative-grade credit has become a global phenomenon as yields compress amid dovish language from central banks around the world. With markets near certain that the Fed will lower interest rates later this month, the debate is now over the size of the cut and its impact. About $13 trillion of global debt already carries negative yields, pushing investors to take more risk to generate greater returns.

“In a world where you have very low yields on risk-free assets, people are looking for yield in other places,” said Sameer Samana, senior global market strategist for Wells Fargo Investment Institute. “If you’re an investor who has a required rate of return of 5%-plus, your options are fairly limited.”

This article was provided by Bloomberg News.