KLA is the monopoly-like franchise in semiconductor process control, with 58% overall share per KLA's own Q3 FY2026 slides (April 29 2026; 57-63% range per VLSI Research) and a dominant position in patterned wafer inspection — a position that has only strengthened from ~50% in 2010. The structural tailwind is process control intensity: as EUV/High-NA, advanced packaging (2.5D/3D/CoWoS, HBM4), and AI infrastructure demand increase defect sensitivity, KLA's algorithmic moat becomes more valuable, not less. The Q3 FY2026 print (April 29) materially de-risked the thesis: $3.415B revenue (vs $3.35B guide), GAAP EPS $0.912 / non-GAAP $0.940 (post-split), and an upward revision of advanced packaging revenue from $635M (CY2025) to ~$1B (CY2026) — that ~$365M lift is pure AI-driven incremental TAM. Q4 FY2026 guide of $3.575B implies FY2026 revenue tracking $13.5B (in line with 2030 $26B target linear path). Multiple street analysts hiked PTs ahead of the split (Wells Fargo $210, Citi $206, TD Cowen $200, Argus $195 — post-split equivalents) — converging on our base case. All per-share figures below are POST-SPLIT (10-for-1 forward split effective June 12, 2026; price/EPS ÷10, shares ×10 to ~1.306B, multiples unchanged). At the current price of $248.45 (June 26, 2026 close) the stock remains above fair value — the June 11 +12.9% move on the Iran-ceasefire defense/semiconductor sector rally plus split optics pushed it above even the bull case ($240) and above the highest street PT ($210); it has since eased ~2.4% from the $254.54 June 12 post-split close but still sits above the bull case. Fundamentals are unchanged, so the probability-weighted return remains sharply negative (−20.0% vs $198.84 PW fair value) and conviction holds at Hold pending mean-reversion.