The stock market could be headed for another bubble like the one investors experienced back in late-January, Wharton School finance professor Jeremy Siegel warned on Thursday.
"As the market goes into full phase, all the hedge funds and everyone else who were short on anticipation might jump on here," the longtime stock bull said in an interview on CNBC's "Fast Money Halftime Report."
Siegel continued, "It's possible we could have a little bubble like we had in January."
In a further clarification via email, Siegel wrote, "[The market] could be headed into a sharp upswing that could end like the what happened in January. But we're not there yet."