Here's a fun game: guess which company counts Cisco, Nvidia, Amazon, and Nokia as its top customers, just reported record financial results, and has management saying things like "no end in sight" to demand. If you guessed Fabrinet, congratulations. You're either a very attentive reader or you've been watching the AI infrastructure trade closely.
The optical manufacturing specialist has become a quiet but critical piece of the AI supply chain, and some of the smartest money on Wall Street took notice during the second quarter. According to the latest Form 13F filings, both Citadel Advisors and Millennium Management significantly boosted their Fabrinet positions in the three months ended June 30. The timing is striking: just weeks later, the company reported blowout results and revealed a customer base that reads like a who's who of tech giants.
Hedge Funds Load Up on Fabrinet
Form 13F filings are required disclosures that show what institutional investors held at the end of a quarter. They don't tell you why they bought or sold, but they do give you a pretty good idea of where the big money is flowing. And in Q2, the big money was flowing into Fabrinet.
- Citadel Advisors made the biggest move. Its disclosed common stock position jumped from 4,963 shares in the first quarter to 151,705 shares in the second quarter, an increase of nearly 2,957%. The reported value of the holding climbed from $2.6 million to $85.3 million.
- Millennium also significantly expanded its investment, increasing its common stock holdings from 61,692 shares to 164,313 shares, while the reported value of the position rose from $32.2 million to $92.4 million.
- Another notable institutional investor, AQR Capital Management, also added to its position during the quarter, increasing its holdings from 71,849 shares to 79,795 shares, with the reported value rising from $37.1 million to $44.1 million.
Now, a quick caveat: 13F filings are a snapshot as of June 30, 2026. They don't reflect any trades these funds made after the quarter ended. So it's entirely possible Citadel or Millennium have already changed their positions. But the fact that they were buying in Q2, right before Fabrinet's earnings, is at least suggestive.
A Customer List That Tells a Story
Fabrinet's latest earnings report was a good one, and not just because of the numbers. The company also gave investors a clearer picture of who's buying its optical components and why. Chief Financial Officer Csaba Sverha laid it out plainly:
"In 2026, we continued to diversify our customer base, with four customers representing 10% or more of total revenue. These were Cisco at 20%, Nvidia at 16%, Nokia at 11%, and Amazon at 11% of total revenue."
That's a notable shift. Fabrinet isn't just an Nvidia play or a Cisco play. It's supplying optical components to a broad swath of the tech world, from networking giants to cloud providers to semiconductor designers. That diversification matters because it suggests the company's AI opportunity isn't tied to any single customer's fortunes.
The company also reported that data center applications accounted for 51% of fiscal 2026 revenue. That's a big deal. It means more than half of Fabrinet's business is now tied to the buildout of AI infrastructure, which is exactly the kind of thing that gets investors excited.
Management Says Demand Is 'Unrelenting'
Beyond the numbers, management struck an unusually confident tone about the demand environment. Chief Executive Officer Seamus Grady didn't mince words:
"Demand from these markets continues to increase, which makes us optimistic about the long-term durability of these trends."
And when asked directly about customer demand, he added:
"There looks to be, you know, no end in sight to the demand from the customers."
That's about as bullish as it gets without breaking out a PowerPoint slide with a hockey stick chart. Management also pointed to continued momentum across data center interconnect (DCI), high-performance computing (HPC), and optical transceivers, suggesting the AI-related demand is broad-based rather than dependent on a single product cycle.
What to Watch Next
So what does all this mean for investors? The 13F filings don't tell us why Citadel, Millennium, or AQR increased their positions, and they don't capture any changes after June 30. But they do show that several sophisticated investors were willing to bet on Fabrinet ahead of an earnings report that reinforced its role in AI infrastructure.
The bigger question is whether the fundamentals can support the stock's premium valuation as AI networking deployments scale and new customer programs move into production. Fabrinet has positioned itself as a key supplier to the AI buildout, and the customer list suggests it's not a one-trick pony. But as with any high-flying tech stock, the market's expectations are high, and the company will need to keep delivering.
For now, the hedge funds seem to think it will. And with management saying there's "no end in sight" to demand, it's hard to argue with them.
