The disconnect between global markets and bond yields is something Mark Grant, chief fixed income strategist at Hilltop Securities, says he hasn't seen in four decades. The dip in global bond yields, though, is herding global investors to the U.S.
"People are going anywhere they can to try and get a return on their capital," Grant told CNBC's "Squawk Box" on Tuesday. "That money's going to come to the United States, where it's certainly much safer where we're not in as bad a financial condition."
Money moves in and out of Asia, and Europe, depending on the best opportunity, he said. The U.S. is now getting a "spillover" effect" as other major central banks kick up quantitative easing and go to negative interest rates.
"Clearly the best opportunity now for yield is in the U.S.," Grant said. "You're seeing huge amounts of money coming into the United States and I think that's what's driving these markets."
The S&P 500 closed at an all-time high Monday, and the Dow hit a high for the year. Meanwhile, U.S. bonds hit record lows last week, with the U.S. 10-year Treasury note closed below 1.4 percent for the first time in history.
"The disconnect, is quite frankly, unreal," he said.