Paramount Skydance, over its first full week on the stock market under new owners, saw its stock jump 30% — and boomed as much as 60% in intraday trading Wednesday. But what triggered the investor enthusiasm wasn’t totally clear.

Shares of the newly merged media conglomerate rallied on increased volume Wednesday after a stock commentator pointed out something about the company's stock float.

In a record rally, shares of Paramount Skydance Corp. are up more than 40% in afternoon trading to lead the S&P 500 index. The dramatic jump in the media company’s share price has sparked meme-stock comparisons and comes just weeks after Opendoor Technologies Inc.