Adding “.com” to a company’s name was once worth, on average, about 74 percent in ten days.

That was the finding of a 2001 Journal of Finance paper on companies that renamed themselves in 1998 and 1999, measured against similar firms that didn’t, and the authors found no sign the gain reversed afterward. After the crash, a follow-up by some of the same researchers found investors rewarding the opposite move — dropping the “.com.” On Tuesday General Motors, first listed on the New York Stock Exchange in 1911, said it would move its listing to Nasdaq on November 17, keeping its ticker and calling Nasdaq a natural home for its technology-driven strategy. Its shares rose 6 percent that day.

What GM changed is its address, not its name, and the address comes with something the renamers never had. Only Nasdaq-listed companies can join the Nasdaq-100, and funds that track it have to buy whatever gets in. GM’s own release pointed out the eligibility. JPMorgan analysts expect GM to be added in December, and there’s a recent template: Walmart moved over in December 2025, was added the next month, and rose 3 percent the day the inclusion was announced.

Take a look at this…

A radical "light-speed" device is turning AI as we know it into "Accelerated AI".

It's smaller than a fingertip. It's made of glass. And it could make AI up to 100 times faster and up to 100 times more energy efficient.

Jensen Huang, Nvidia's CEO, says this device is shattering the limitations of AI and without it, AI can't scale.

Google Ventures says it's the future of AI compute.

And Sequoia Capital calls it a "holy grail".

Yet most Americans have never heard of it…

Wall Street insider Jason Bodner – the same man who called Nvidia at $4.50 – believes this device could launch a whole new wave of AI winners.

And to prove it, he's giving away his #1 stock involved with it – for free.

So this time the buyers are written into a rulebook rather than conjured by a mood. The complication is that rulebook buying has been worth less and less. Harvard’s Robin Greenwood and Marco Sammon found that the average abnormal return for a stock added to the S&P 500 fell from 7.4 percent in the 1990s to under 1 percent over the past decade, even as more money tracked the index, and that more of the move now happens before any announcement. GM’s 6 percent day came more than six weeks before Nasdaq is scheduled to announce its list, on a day GM also unveiled hybrid SUV plans. The NYSE, which is losing the listing, told Fortune that companies leaving for the Nasdaq-100 have seen their valuations compress. Three former Nasdaq-100 members, Skydance, Kraft Heinz and AstraZeneca, have gone the other way.

The renamers of 1999 needed investors to believe something. GM needs only a ranking at the end of November that anyone can estimate in advance. The research suggests that a rule everyone can read is a rule everyone trades ahead of.