COHR

Coherent is the highest-quality business we've looked at this week, and it's also the one where we're least sure what it's worth. The numbers are good: revenue of $1.81 billion last quarter, up 21% from a year ago, with margins improving and earnings of $1.41 per share versus $0.91 the year before. Management said demand from data center customers is exceptionally strong and they're expanding capacity to keep up. Then late July happened — the stock fell 11% one day and another 9% the next, closing at $222. There was no company news behind either drop. Its competitors fell the same amount on the same days. This was the whole optics sector getting sold at once. What Coherent makes is the light-based hardware that moves data long distances — the transceivers that convert electrical signals to light and back, which is how data travels between racks and buildings inside a data center. The thing that makes Coherent different from most of its competitors is that it makes its own raw materials. It grows the specialty crystals that go inside its own products rather than buying them. That's unusual and it matters: it's much harder for a customer to replace you when you control the ingredient supply, and it's a real advantage when everyone is fighting over scarce capacity. Coherent also has an older laser and industrial business unrelated to AI, which is steadier but less profitable and drags the overall margins down. Here's our honest problem with this one. Analysts have an average price target near $391 while at least one valuation model pegs fair value at $86 — for the same company, at the same time. That spread isn't really a disagreement about Coherent. It's a disagreement about whether AI data center spending holds up, and Coherent is just where the argument is happening. We'd also flag that last quarter's earnings came in right at expectations rather than clearly beating, which is a change from the previous few quarters and worth watching rather than ignoring. The next report is August 12. The thing we'd watch isn't revenue — it's whether profit margins keep improving as they ramp up production. If margins expand while they grow, owning the materials is paying off and the July selloff was just fear. If margins flatten out, then Coherent is selling capacity, and capacity eventually gets cheap. (written with the help of Claude)