The PIMCO ETF have roughly doubled in size since the start of the year, notes Chris Hempstead, director of ETF execution services at WallachBeth Capital.

“The slope is steep here,” he commented on the ETF’s recent growth. “We have seen this before. I wonder where it stops.”

PIMCO 0-5 Year High Yield Corporate Bond Index

Full disclosure: Tom Lydon’s clients own JNK.