Not Nvidia. Not Micron. This Little-Known Chip Stock Is the AI Boom's Best-Kept Secret.

Everyone knows that GPUs are a strong investment because they make an artificial intelligence (AI) data center run, and most investors are now figuring out that memory matters too. What fewer people think about is the cable. Thousands of accelerators in a single building only work if the data between them arrives clean, fast, and without a single dropped link, and the company that has become the reference name for that job is not Nvidia or Micron Technology.

It is Credo Technology Group (NASDAQ: CRDO), a connectivity chip designer whose stock has more than tripled in three years and still gets a fraction of the attention its customers give it.

What Credo does

Credo's signature product is something called an active electrical cable, or AEC. It looks like a thick copper cable, but it has Credo's chips built into each end to clean up the signal, allowing hyperscalers to connect servers and switches at 800 gigabits per second over copper instead of paying for power-hungry optical transceivers.

The company's purple cables are distinctive enough that Credo trademarked the color. It also sells the retimer and digital signal processor chips inside those cables as stand-alone parts, plus optical DSPs, PCIe retimers, and licensed intellectual property.

Image source: Getty Images.

Credo's "little-known" status is mostly a function of what it sells rather than of how much it sells. Revenue in the quarter ended Aug. 1 more than doubled from a year earlier, and the company has gone from licensing firm to hardware supplier for several of the largest cloud operators in about three years.

Pay attention to Credo

The reason to pay attention right now is that Credo is in the middle of a planned shift from copper to light, and October is when the pieces showed up. In May, it closed its acquisition of DustPhotonics, an Israeli silicon photonics company, which gave Credo an in-house photonic chip capability to go with its existing DSPs and cable systems. Management said at the time that it expects the combined optical portfolio to become a "significant growth driver" in fiscal 2027.

Then at the Open Compute Project summit in San Jose this month, Credo unveiled its 1.6-terabit ZeroFlap Active Light Cable. Instead of pushing a few optical channels to extreme speeds, it uses a dense array of tiny light emitters running in parallel at slower rates. The approach is designed to deliver copper-level reliability out to 50 meters, covering a full row of data center racks, while drawing about 30% less power than a comparable copper AEC and weighing a tenth as much.

CEO Bill Brennan's talk at the show was titled, "Wider. Slower. Better: Optics That Can Beat Copper," which tells you how the company sees the next five years. The cable ships in 2027.

The risks of Credo

This is not a sleepy value stock. Credo's revenue is concentrated among a handful of hyperscalers whose ordering patterns can swing a quarter, and the stock has already fallen over 40% from its high earlier this year. The copper-to-optical transition is as much a risk as an opportunity: if customers move to optics before Credo's new products are ready, its AEC business could be squeezed before the replacement arrives. The CEO also sold about $2.5 million of stock in September, which is small but worth knowing.

Is Credo the AI boom's best-kept secret?

For a company this central to how AI clusters are wired, yes, and the recent drop makes the entry point better than it was a month ago. I think the move into silicon photonics is the real investment story. Credo is trying to own both the copper era and the optical era of data center connectivity, and it has a roadmap and a standards push to back that up. Investors comfortable with a volatile growth stock could start a position before the Dec. 2 earnings report and add if the optical products ramp on schedule.

Micah Zimmerman has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Micron Technology and Nvidia. The Motley Fool has a disclosure policy.