Keysight's gross margin expanding on fast revenue growth shows real chokepoint pricing power in AI test. Q3 FY26 gross margin reached about 69%, up roughly 140-150 bp from Q2's clean 67.6%, as revenue grew 36.5% to $1,846M; operating margin hit 33.2%, above its 31-32% long-term target. Orders rose 56% to $2,091M, though book-to-bill narrowed to 1.13, and Q4 EPS guidance of $3.34-3.40 tops the ~$2.68 consensus. Management says it spans pre-silicon design through manufacturing. x.com  x.com  x.com 

Aehr remains a concentrated, expensive way to own wafer-level photonics burn-in: its 10-K says silicon-photonics customers primarily drove that revenue growth, and FY2027 guidance of $130m-$150m could nearly triple FY2026 sales, yet shares value it at about 20x the guide. Teradyne's acquired photonic-chip test business is not material to its much larger sales; Aehr's top five customers provided 70% of FY2026 revenue, so orders matter more than the headline CPO opportunity. x.com 

Keysight looks expensive against its earnings at $319.45, about 16% above the top of a $216-275 fair range. It trades at 23x forward earnings versus the industry's usual 18x, and that multiple leans on a forecast 259% above trailing earnings. This is a levels-only read from reported earnings and estimates, without fundamental work. x.com 

Keysight has an overlooked moat: before any hardware innovation such as AI chips, 5G/6G or EVs reaches the market, it must be tested and meet strict standards, and Keysight owns that critical testing market with a unique mix of hardware and software. Rather than guessing which tech company will win, investors can own the one that tests them all. The stock is up 69% YTD. x.com 

Aehr Test Systems stands to benefit because testing is a bottleneck to scaling AI chips. Testing demand is about to surge. Investors did not question its price-to-sales ratio at 120, despite the current P/S objection. x.com  x.com 

Quantum computing's suppliers get paid whoever's machine wins, as steel mills did while most railroads went bankrupt. Chips, test benches, cryogenic freezers, inspection, lasers, vacuum gear and light must be bought regardless. Washington signed nine letters of intent worth about $2.013 billion before any machine was built, half to the one recipient with a working foundry. Only one name is in its buy zone; the rest await lower prices. Two flat quarters of cryogenic and control orders ends it. … Show more

Keysight remains a favored test name as its planned OCP showcase extends AI infrastructure validation across scale-up, scale-out and scale-across networks and inference. The breadth suggests growing traction in testing varied AI architectures as data-center operators need to validate more complex deployments, extending its earlier silicon-photonics design-to-test opportunity. x.com 

Aehr Test Systems is monetizing the test layer of the AI optical interconnect buildout as silicon photonics burn-in reaches production scale. It guided FY2027 revenue to $130-150M, up 160-200% from $50M, after record bookings of $60.7M and a $100.6M effective backlog. Every 800G and 1.6T transceiver and optical I/O chip in AI data centers needs reliability screening, so transceiver growth feeds burn-in demand. Its lead silicon photonics customer keeps reordering and a second is ramping. x.com 

Aehr Test Systems stands to benefit from Broadcom's custom AI chip ramp because these 600W–2kW multi-die packages need burn-in testing. Broadcom said XPU shipments rose 3.5x and laid out $115B of AI revenue in FY27 and $230B in FY28 with supply secured, backed by multi-gigawatt Google, Anthropic, OpenAI and Meta deployments. Aehr won a record $41M package-level burn-in order from its lead hyperscale customer for a custom AI ASIC, with a next-gen device moving to production later this year. x.com 

Aehr Test Systems' selloff has been excessive, despite concern about Teradyne expanding into burn-in, given where the two actually compete, as @LIWEI_TWCapital's comparison shows. x.com