It was a quiet, reflective day from the stock-picker known as Serenity, who used a single post to step back from the trade and acknowledge just how impenetrable his corner of the market can look to outsiders.

Serenity's investing approach centers on what he calls the AI photonics buildout — the shift toward moving data inside data centers with light rather than copper wires. His method is to back-map Nvidia's roadmap and the hyperscalers' plans, then hunt for the small, obscure upstream suppliers — the "chokepoints," or critical bottleneck vendors with few substitutes — that the whole effort quietly depends on.

Today he poked fun at the sheer density of three-letter acronyms that define the field. He rattled off a list of competing optical-link approaches — among them CPO (co-packaged optics, the technique of placing the light engine right next to the switch or GPU die to save power and boost bandwidth) — alongside the alphabet soup of materials and components like InP (indium phosphide, the compound-semiconductor base for high-speed lasers), EML lasers, and SOI. He noted that even the industry's big trade gatherings, like OFC and OCP, get their own initials.

His broader point was aimed at newer followers: those who have tracked what he calls his "optical bottleneck scavenger hunt" through names like Soitec and IQE may now be fluent in the terminology, but a fresh arrival could easily feel lost.

The two tickers he flagged are the anchors of that hunt. Soitec is a French supplier that dominates the market for silicon-on-insulator (SOI) substrates — the specialized base wafers used in silicon photonics and co-packaged optics. Serenity treats it as a near-monopoly at the substrate layer, one he argues was long held down by its exposure to the cyclical smartphone market but stands to re-rate as photonics ramps in 2027 and 2028. He has described it as a sizable, multi-year holding with a cost basis around 43 euros, already up several-fold.

IQE, the UK-listed epiwafer maker, is his other core name in the theme. It is the largest independent merchant foundry for compound-semiconductor epiwafers — the layered materials that lasers and photonic chips are grown on — yet trades at a distressed valuation, weighed down by legacy wireless-chip business and debt. Serenity's thesis is a high-risk turnaround: if IQE clears its balance sheet and redirects its latent reactor capacity toward InP epiwafers for the photonics buildout, the shares could re-rate many times over. He has pointed to its supplier relationship with Lumentum and recent industry deals as evidence the pivot is real.

There was no new trade, target or position change today — simply an admission that the jargon curve is steep, and a nod to the two substrate and epiwafer plays that sit at the base of his optical thesis.

*This is derived commentary and reconstructed coverage, not investment advice, and does not represent Serenity's own words.*