The stocks that led the Nasdaq higher today were not the chipmakers everyone watches. They were the companies that make the parts moving data between the chips.
The Trade Hiding in Plain Sight
The Nasdaq climbed about 1.2% today. Most of the attention went to memory chips and the coming SK Hynix listing. But the sharpest leadership came from a quieter corner: optical communications.
These are the companies that build the lasers, transceivers, and fiber links that carry data across an AI data center. Every graphics chip a company installs is useless if the data cannot reach it fast enough. As clusters grow past 100,000 chips, moving that data becomes the hard part. Light is how they do it.
Investors have spent two years bidding up the chips. The parts that connect them have run just as hard, with far less coverage.
Why the Parts Matter
An AI training run splits work across thousands of chips that must talk to each other constantly. Copper wiring cannot keep up at that scale, so the industry has shifted to optical links that send data as pulses of light.
That shift has turned a sleepy component business into a growth engine. The market for optical transceivers alone runs into the tens of billions of dollars and is expanding fast, according to reported industry estimates. Each new data center buildout pulls in more of these parts, and the biggest operators keep raising their spending plans.
The result is a group of suppliers posting growth rates that look more like software than hardware. Revenue at the leaders is climbing at double-digit and even triple-digit rates as orders pile up.
The Names Doing the Work
Lumentum has been the standout. The stock has climbed more than tenfold over the past year, making it one of the best performers in the entire market, and it recently posted record quarterly revenue up roughly 90% from a year earlier. Wall Street targets now cluster near four figures, with the most bullish reaching about $1,300 according to reported estimates. The company trades on the Nasdaq.
Coherent is the other large pure-play. It has guided next-quarter revenue above $1.9 billion, ahead of consensus, on more than 30% top-line growth. The catch is valuation. At least one cash-flow model pegs fair value well below where the shares have traded, a reminder that the growth is real but the price already assumes a lot of it.
Ciena sits one layer out, building the networking gear that ties data centers together, and has guided full-year revenue toward the $6 billion range. Applied Optoelectronics is the smaller, more volatile way to play the same demand, with all the extra risk a micro-cap carries.
The Next Bottleneck and the Catch
The forward story is co-packaged optics, or CPO. Instead of plugging transceivers in beside the chip, CPO builds the optical connection directly onto the chip package. That cuts power use and speeds data movement, and it is exactly where the next wave of spending is headed. The suppliers positioned for it are the ones analysts keep upgrading.
The risk is the one every hot supply chain faces. These stocks are priced for years of flawless execution. Memory chips taught investors what happens when a supply crunch turns into a supply glut, and optical parts are not immune to the same cycle. A single guidance miss can erase months of gains.
For investors who already own the chip trade, optical networking is the connected bet on the same buildout, one step removed from the crowd. Earnings from this group over the next few weeks will show whether the demand is still accelerating or finally catching its breath.
