The best performer in the NASDAQ-100 last quarter wasn't a household name. Not NVIDIA, not Micron Technology, not SanDisk. It was Astera Labs (ALAB): up 342% in three months, added to the index on June 22. I took a close look at the company. My conclusion up front: the growth story is real. But the stock isn't an investment for me. The valuation already prices in the entire story, and I think the market underestimates the risks.For context: the NASDAQ-100 gained over 27% in the second quarter after losing more than 9% in the first. Chip stocks dominated the leaderboard. SanDisk, Micron and Intel each gained over 200%, taking spots 2 through 4. At the top: Astera Labs. The remarkable part: in the first quarter, the stock had crashed around 45%. These extreme swings are no fluke. They have been the pattern since the March 2024 IPO.

What Astera Labs does is genuinely interesting. Like NVIDIA, it runs a fabless model and has TSMC manufacture its chips. It focuses on designing connectivity solutions for data centers, because modern AI clusters are no longer just GPUs. For thousands of graphics processors to work like one giant brain, they have to exchange massive amounts of data in fractions of a second. That connection is becoming the bottleneck. Astera's Aries chips speed up the links between processors, Taurus modules optimize the connection between servers and switches, Leo controllers expand the memory of AI accelerators, and Scorpio switches fuse thousands of GPUs into a single cluster. The company's own software, COSMOS, sits on top.

The numbers: revenue has grown from $80 million in 2022 to around $853 million in 2025, roughly 120% per year on average. With $219 million in net profit, 2025 was the company's first profitable year. The Scorpio family is set to become the largest segment by year-end. From 2027, partnerships like the one with Microsoft Azure, plus NVLink Fusion and optical connectivity, are expected to add further growth.

The problem is the price. Even after a roughly 20% correction from the June 30 all-time high, the market values Astera Labs at around $74 billion. Against current earnings, that's too much for me. After earnings per share of $1.22 for 2025, analysts expect $2.01 in 2026, then $3.19 and $4.51. That last figure would mean around $812 million in profit for 2028, more than triple the 2025 result. And even on that optimistic basis, the P/E sits above 90. The stock has to get everything right for three straight years just to grow into a valuation that would still be aggressive.

I consider the risks anything but theoretical. Around 90% of first-quarter 2026 revenue came from just five customers. Manufacturing depends on a few partners. A significant share of revenue comes from Taiwan, Singapore and China, so tighter export controls would hit the business directly. And the technical standards in this market are still in flux. If a different technology wins, the product strategy leads nowhere.

So here's where I land: ALAB is a stock for trading. The strong price momentum offers opportunities in both directions. For a buy-and-hold investment, the foundation is missing: the valuation leaves no room for error, and the risks are real. The extreme swings can become a problem too, once they point the wrong way.

Is Astera Labs stock a good long-term investment in 2026?
Astera Labs (ALAB) was the best-performing stock in the NASDAQ-100 in the second quarter of 2026, up 342%. The company designs connectivity solutions for AI data centers and grew revenue from $80 million in 2022 to around $853 million in 2025, with $219 million in net profit marking its first profitable year. Despite the strong growth, I don't consider ALAB a good long-term investment at the current valuation of around $74 billion, which implies a P/E above 90 even based on 2028 earnings estimates. The biggest risk is customer concentration: around 90% of first-quarter 2026 revenue came from just five customers. In my view, the stock suits trend-following trading strategies, not buy-and-hold investors.

Disclaimer: This newsletter is for informational purposes only and does not constitute investment advice. I am not a financial advisor. Always do your own research before making any investment decision.

Disclosure: I may hold direct or indirect positions (including options) in any securities mentioned in this newsletter. My opinions are my own and always honest.