Thursday was a historically strange day in the stock market. That may be good news

Wall Street saw a dramatic shift in market trends on Thursday, with winning and losing stocks swapping places for a day. It may turn out to be just what the rally needs to keep going.

The Russell 2000 small-cap index, which has struggled to find its footing all year, jumped more than 3% on Thursday. At the same time, every stock in the so-called Magnificent Seven fell, including a more than 5% decline for Nvidia and a 2.3% drop for Apple, which dragged down both the S&P 500 and Nasdaq Composite.

Bespoke Investment Group shared two statistics on the social media site X to demonstrate how rare it is to have that type of split.

While the major market averages and many individual 401(k) accounts may show a decline for the day, this odd set of results could be a positive sign for the market. Much of the recent rally has been driven by large tech companies, leading investment pros to worry about a narrow group of stock market leaders.

"Today's an important day," Ed Yardeni of Yardeni Research said on CNBC's "Closing Bell. "This is the day where investors are starting to rotate out of the Magnificent Seven into the rest of the market. I don't think this is going to continue to pull the S&P 500 down — I think there's going to be enough money to keep the leading stocks that have done so well fairly elevated, but I think we are going to see more gains in the S&P 493, as well as in the small- and mid-cap stocks," he added.

The split trading came after the June report for the consumer price index early Thursday showed headline inflation declined last month and is now up about 3% over the past year. That bolstered confidence that the Federal Reserve will begin to cut interest rates as soon as September. Federal Reserve Chair Jerome Powell