Compute Substrate — AGI Track
1. Thesis
Cognition is becoming abundant. Once recursive self-improvement starts compounding inside the labs, the binding constraint shifts to the physical machine that runs the cognition. The labs are not capital-constrained or model-constrained — they are substrate-constrained. NVIDIA shipping next-gen XPUs, Anthropic and OpenAI training frontier models, and the US/China governments each subsidizing domestic fabs all converge on a single physical bottleneck: advanced logic wafers + HBM + advanced packaging + the optics that connect them, all of which have multi-year capex cycles, single-digit-supplier concentration, and >50-week lead times today.
The investable insight is that the constraint is not the GPU vendor. It is the suppliers upstream of the GPU vendor. TSMC's CoWoS lines are sold out through 2027 (Silicon Analysts Q1'26); HBM3E/HBM4 capacity is sold out for 2026 across all three suppliers; ASML is the sole EUV vendor; Lumentum/Coherent/Fabrinet are sold what they can build. The market has partially noticed (LRCX +318% in 12 months, Lumentum +1,455%, Coherent +386%) but the path-of-least-resistance bid is still flowing into NVIDIA. Where supply cannot expand fast — fabs (4-year build), packaging (2-year build), photoresist (chemistry), specialty optics (single-supplier reticle steppers) — pricing power is being underestimated.
2. The bottleneck hierarchy (as of May 2026)
Ranking is by current scarcity and time-to-relieve:
| Rank | Bottleneck | Quantified scarcity | Time to relieve | Who owns it |
|---|---|---|---|---|
| 1 | CoWoS advanced packaging | 52–78 week lead times across all 3 TSMC AP fabs; sold out through 2027; NVIDIA ~60–70% of allocation | 2–3 years (new AP fab build) | TSMC (dominant), Amkor & ASE overflow at 26–39 wk lead times |
| 2 | HBM (3E 8-Hi/12-Hi, HBM4) | All 3 suppliers' 2026 capacity sold out; shortage forecast through 2028; HBM4 per-stack pricing ~$500 vs $300 for HBM3E 12-Hi (+67% generational uplift) | ~24 mo (capex + DRAM-to-HBM line conversion) | SK Hynix ~50%, Samsung ~28%, Micron ~22% bit share in 2026 |
| 3 | Leading-edge logic (N3, N2, A16) | TSMC N3 fully booked; 2nm/A16 70% CAGR 2026–2028 planned; 9 phases of fab build started in 2026 | 4–5 years per fab | TSMC near-monopoly at leading edge; Samsung distant, Intel struggling |
| 4 | EUV lithography systems | Single supplier; High-NA EUV shipping in low units; AI customer capex on equipment +18.6% in 2026 | Permanent constraint — no substitute | ASML (100%) |
| 5 | Optical interconnect (800G/1.6T) | Lumentum revenue +69% TTM; Fabrinet revenue +30% TTM; rack-to-rack and pod-to-pod optical link demand outrunning supply | 12–18 mo | Coherent, Lumentum, Fabrinet (manufacturing); Marvell + Broadcom (silicon) |
| 6 | EUV mask inspection & specialty WFE | Lasertec near-monopoly in actinic mask blank inspection; ¥3.7T market cap; ¥213B FY24 revenue | 3–5 years (no near-term challenger) | Lasertec (actinic), KLA (broader inspection), Disco (dicing/grinding) |
| 7 | Liquid cooling at hyperscale | Vertiv 30% organic Q1; Modine just signed $4B hyperscaler deal (2027–2029), 6x its current data center revenue | 12–24 mo for capacity; tech is the gating factor | Vertiv, Modine (Airedale), nVent, Asetek |
| 8 | Specialty materials & gases | EUV photoresist controlled by 3 Japanese firms (JSR, TOK, Shin-Etsu Chem); electronic-grade neon & helium niche but recoverable | 2–4 years for new chemistry qual | JSR, TOK, Shin-Etsu Chem, Entegris (delivery systems) |
| 9 | Silicon wafers (300mm) | Demand recovering after 2024 inventory destock; 4-firm oligopoly | 3–4 years for new ingot capacity | Shin-Etsu Handotai, Sumco, GlobalWafers, Siltronic |
| 10 | EDA / IP | Cadence + Synopsys + Siemens EDA = effective triopoly with deep customer lock-in; chip-design productivity is the actual bottleneck for custom silicon | Permanent moat | Synopsys, Cadence, Siemens EDA |
3. Supply/demand gap model
Setting up demand-side and supply-side numbers:
Demand side (cited)
- TSMC's own forecast: AI accelerator wafer demand growing 11x from 2022 to 2026 (TrendForce). FACT
- CoWoS capacity: 80%+ CAGR 2022–2027 (TSMC). FACT
- HBM TAM: ~$30B in 2024 → $80B+ in 2026e per TrendForce composite. FACT
- Semiconductor capex of top customers (TSMC/Samsung/Intel/Micron/SK): +19.6% in 2025, +18.6% in 2026 (ASML reference). FACT
- Global chip industry sales 2026: ~$975B target (+~25% YoY). FACT
Demand side (my estimate, AGI-pilled)
The consensus 2026–2028 capex curves assume a "normal" AI investment cycle. Reasoning from "given AGI is happening," I expect the labs to attempt to double effective compute every 6–9 months through 2028 — not the ~12–18 month cadence implied by current capex. The two delta sources will be: (1) frontier-lab self-funded GPU buildouts (xAI, Anthropic, OpenAI, Meta hitting $200B+ combined run-rate by 2027) and (2) sovereign-AI buildouts (US/EU/UAE/Saudi) accelerating from low base. ESTIMATE Net: 2026–2028 demand at the wafer level is probably 30–50% above current TSMC/ASML guidance.
Supply side (cited)
- TSMC capex 2025: $42B; 2026e ~$45–50B; 9 fab phases starting in 2026. FACT
- Fab build time: ~4 years shell-to-production for leading-edge. DERIVED
- HBM line conversion: 18–24 months from greenlight to qualified bits. DERIVED
- ASML High-NA EUV: ramping at ~5–10 systems/yr through 2027 — that is the literal upper bound on how fast the world can install new leading-edge capacity. ESTIMATE
Gap conclusion
4. Investable public companies
Prices and market caps as of close 2026-05-26 unless noted. "Already-priced-in" is my honest assessment of how much of the AGI/AI supply-constraint bid the stock has already absorbed; lower score = more headroom.
| Ticker | Mkt Cap | Price | Valuation | Owns this bottleneck | Key risks | Priced-in (1-10) |
|---|---|---|---|---|---|---|
| TSM | $1.87T | $412 | ~30x FY26 P/E | Sole leading-edge logic + dominant CoWoS | Taiwan geopolitics; Intel 18A; capex inflation | 6 |
| ASML | $621B | $1,632 | ~36x P/E | EUV monopoly (incl. High-NA); structurally un-substitutable | China 42% of 2025 revenue, falling; export controls; long order cycle | 6 |
| AVGO | $2.00T | $422 | ~40x FY26 P/E (est) | Custom XPU (Google/Meta) + AI networking silicon (Tomahawk/Jericho) | Custom-silicon customer concentration; software (VMware) drag | 8 |
| SK Hynix (000660.KS) | ₩1,453T (~$1.07T) | ₩2,333,000 | ~13x P/E | ~50% HBM bit share; first to HBM4; ~70% of NVDA Rubin HBM4 allocation | Cyclicality risk if AI capex pauses; Samsung HBM4 finally qualified | 5 |
| MU | est ~$1T | $895.88 | ~15x FY26 P/E | HBM3E ramp + HBM4 entry; only US-listed pure-play HBM proxy | DRAM cycle; HBM yield ramp risk; only ~10% of Rubin allocation | 7 |
| LRCX | $404B | $322.68 | ~30x P/E | Etch/deposition leader; HBM TSV etch is core to memory stack scaling | WFE cyclicality; China exposure | 7 |
| AMAT | $361B | $454.89 | ~28x P/E | Broadest WFE portfolio; advanced packaging tools; epi for GAA | Less HBM-levered than LRCX; China exposure | 6 |
| KLAC | $263B | $2,011 | ~36x P/E | Process control monopoly; every fab needs them; very high incremental margin | Cyclical; some Lasertec overlap | 7 |
| Lasertec (6920.T) | ¥3.74T (~$24B) | ¥41,680 | ~43x P/E | Actinic EUV mask blank inspection — single-source for ASML/TSMC/Samsung | One-product-line concentration; capex lumpy; ADR liquidity (LSRCY) thin | 4 |
| Tokyo Electron (8035.T) | ¥23.2T (~$148B) | ¥54,500 | ~41x P/E | Coater/developer monopoly (EUV track tool); advanced etch | WFE cycle; Japan-only listing for many investors | 5 |
| Disco Corp (6146.T) | est ~¥6T (~$38B) | — | ~40x P/E (est) | De-facto monopoly in dicing/grinding for HBM TSV and CoWoS | Equipment cycle; Japan listing | 4 |
| Amkor (AMKR) | est ~$10B | — | ~22x P/E | #2 OSAT (advanced packaging overflow from TSMC); Arizona AP fab build | Lower margins than TSMC; capex headwind; small vs. TSMC | 3 |
| ASE Tech (ASX) | est ~$30B | — | ~14x P/E | Largest pure-play OSAT; FOPLP and advanced packaging investments | Commodity packaging drag; pricing power weaker than TSMC | 4 |
| Shin-Etsu Chem (4063.T) | est ¥10T (~$64B) | — | ~18x P/E | Silicon wafers (Shin-Etsu Handotai) + EUV photoresist + chemicals | Big conglomerate dilutes pure exposure | 4 |
| SUMCO (3436.T) | est $5B | — | ~18x P/E | #2 silicon wafer maker | Slowest part of the stack to bid up; wafer pricing weak | 2 |
| JSR (4185.T) | delisted — JIC tender 2024 | n/a | n/a | EUV photoresist leadership — no longer investable publicly | Not investable | n/a |
| SNPS | $102B | $534.56 | ~35x fwd P/E | EDA + IP; Ansys deal closed; AI design copilots | EDA growth maturing; Ansys integration risk | 6 |
| CDNS | $105B | $381.75 | ~47x fwd P/E | EDA #2 with strong IP and verification franchise | Premium multiple; competition with Synopsys | 6 |
| COHR | $74.6B | $381 | ~38x fwd P/E (est) | 800G/1.6T datacom optics; vertically integrated InP laser | Already +386% in 12mo; Aschenbrenner just sold | 8 |
| LITE | $70.9B | $910.81 | ~57x fwd P/E | EML lasers for hyperscaler optics; CW lasers for co-packaged optics | +1,455% in 12mo — bid is in price | 9 |
| FN | $24.4B | $680.77 | ~32x P/E | Contract optical/photonic mfg — silent benefactor of every optics ramp | Customer concentration (NVIDIA, Cisco) | 7 |
| MRVL | est ~$130B | — | ~35x fwd P/E | Custom XPU (one US hyperscaler, second engagement ramping); coherent DSPs; AEC | Concentration on one hyperscaler; NVDA/AVGO competition | 6 |
| ALAB | $54.6B | $318.72 | ~60x+ fwd P/E | PCIe retimers + Scorpio scale-up fabric chip — only credible alt to NVLink | Extreme multiple; product-cycle risk; reliance on PCIe 6.0 adoption | 8 |
| VRT | $124B | $323.91 | ~50x fwd P/E | Data-center thermal+power leader; FY26 guide 29–31% organic growth | Stopped reporting backlog Q4'25 (lower transparency); priced for perfection | 7 |
| MOD | $14B | $296.93 | ~41x fwd P/E | Airedale liquid cooling; just signed $4B hyperscaler deal (2027–29) | Single-customer concentration on the new deal; non-DC business is legacy | 5 |
| nVent (NVT) | est ~$15B | — | ~22x P/E | Liquid cooling acquisitions (CIS, ECC); rack-level thermal | Less pure-play than Vertiv/Modine | 5 |
| ENTG | $21.7B | $142.12 | ~37x fwd P/E | Fluid handling, filtration, materials delivery for fabs — quiet picks-and-shovels | Revenue still flat YoY (recovery, not boom) | 4 |
| Linde (LIN) | est ~$220B | — | ~30x P/E | Largest electronic-grade industrial gases supplier (incl. neon, helium) | Industrial-gas pricing is regulated; only partial AI exposure | 4 |
| Air Products (APD) | est ~$70B | — | ~22x P/E | Electronic gases + on-site supply | Hydrogen capex overhang; less AI exposure than LIN | 3 |
5. Pre-IPO / private to watch
| Company | What it is | Status | Why watch |
|---|---|---|---|
| Cerebras Systems | Wafer-scale AI accelerator (CS-3) | IPO filed; $510M revenue, $10B OpenAI commitment, $23B valuation | Only credible alternative to NVIDIA at scale for inference; will trade like NVDA-beta |
| Lightmatter | Silicon photonics interconnect + photonic compute | ~$4B+ valuation; Series D | If photonic interposer adoption hits, could disintermediate copper SerDes |
| AYAR Labs | In-package optical I/O (TeraPHY) | Late-stage private; Intel/Nvidia investors | Co-packaged optics is the most likely "next bottleneck" past copper limits at 224G |
| Celestial AI | Photonic Fabric memory-compute interconnect | Series C done | Memory wall is the constraint AGI labs care most about |
| Rain AI / EnCharge AI / Mythic | Analog in-memory compute | Early; commercial in 2026–2027 | If energy/W is the binding constraint post-AGI, analog wins niches |
| Tenstorrent | RISC-V + AI accelerator (Wormhole/Blackhole) | ~$2B valuation; Korea/SK Hynix backed | Open RISC-V plus Jim Keller credibility |
| SiPearl / RISC-V sovereign plays | EU/India/Japan/Korea sovereign AI silicon | Govt-funded | Sovereign-AI capex is real and will buy from non-NVDA where allowed |
| Groq / SambaNova / Etched | Inference-specialized silicon | Private, mid-stage | Inference TAM dwarfs training in the AGI deployment phase |
6. Commodity / physical resource / ETF plays
- SMH (VanEck Semiconductor): Most-liquid US semis ETF; ~25% NVDA, ~14% TSM, ~10% AVGO. Beta to the whole stack. Best "one-trade" exposure if you don't want to pick.
- SOXX (iShares Semiconductor): Similar holdings, more equal-weighted at top. Slightly less concentrated.
- SOXQ (Invesco): Lower fees, similar exposure.
- FTXL (First Trust Nasdaq Semis): Adds VRT and equipment/materials weighting.
- Materials & specialty chemicals: No clean US ETF. Closest is direct buys: ENTG, SHECY (Shin-Etsu Chem ADR), Linde (LIN). Tokyo Ohka (4186.T) and JSR (delisted) round out photoresist exposure.
- Neon & helium: No pure-play. Linde + Air Products + Air Liquide carry it; Ukraine supply has largely recovered post-2022 dislocation. Not a current bottleneck.
- Quartz (high-purity for crucibles): Sibelco (private) + Mineração Curimbaba (private). Effectively un-investable publicly; tracked via Shin-Etsu Chem and Sumco indirectly.
- Cooling fluids (PFAS-free): 3M exiting PFAS; Chemours, Solvay (now Syensqo) emerging. Speculative.
7. People & talent concentration
Critical know-how concentration matters because hiring is the most leading indicator of capability transfer:
- Advanced packaging engineers (CoWoS, FOWLP, HBM TSV): Concentrated at TSMC, Amkor, ASE, Disco. Signals: any major hire-out by Samsung Foundry or Intel Foundry indicates closing the gap. Watch LinkedIn movement at TSMC Taoyuan and TSMC Arizona.
- EUV photonics & optics: ASML (Veldhoven) + Zeiss SMT + Cymer (acquired). No real out-flow possible — this is the single rarest engineering pool in the world.
- HBM design teams: SK Hynix has 5-year lead from sustained investment; Samsung's HBM org was reorganized 2024–2025 after repeated qualification failures (signal: read Korean financial press on Samsung memory leadership changes).
- Chip-architecture leadership: Jim Keller (Tenstorrent), Raja Koduri (Mihira AI), key NVIDIA alumni at xAI/Anthropic/OpenAI. Any of these landing at a public company is a 5–10% pop signal.
- Process integration (3nm/2nm): TSMC vs. Intel Foundry attrition is the most-watched proxy for whether Intel 18A actually ramps.
Acquihire signals to watch: any large public buyer paying premium for a 30–50 person photonics, in-memory compute, or HBM controller startup is a tell that the listed players see a gap.
8. Top picks ranked
#1 — SK Hynix (000660.KS) HIGH CONVICTION
Thesis: ~50% bit share in HBM in a market that grew from $30B (2024) to $80B+ (2026e) and is forecast in shortage through 2028. ~70% of NVIDIA Rubin HBM4 allocation. HBM4 per-stack pricing is +67% generational uplift over HBM3E 12-Hi, which is unheard of in DRAM. P/E of ~13x is materially below TSM (~30x), Lasertec (~43x), and the WFE names (~30–36x). Despite a +1,043% market-cap increase over the year, valuation is still cyclical-discount because the market treats it as DRAM. The whole point of the AGI thesis is that HBM is no longer cyclical — it's structurally undersupplied.
Why above #2: Cheapest valuation in the whole substrate stack, sitting on the most acute non-CoWoS bottleneck, with Korean listing access friction depressing the bid relative to fundamentals. ADR (HXSCL) exists for US holders.
#2 — TSMC (TSM) HIGH CONVICTION
Thesis: Sole supplier of leading-edge logic AND dominant advanced packager. Already crystallized as a near-monopoly with 30x earnings. The only reason it isn't #1 is that some of the bid is in price. But $1.87T market cap on a company that literally cannot lose the next 3 years of AI capex is still cheap on a sum-of-parts basis. CoWoS sold out through 2027; 80% CAGR through 2027; 9 fab phases breaking ground in 2026.
Why above #3: Monopoly + monopsony-like pricing power with NVIDIA. Geopolitical discount remains visible vs. ASML.
#3 — Lasertec (6920.T) MEDIUM-HIGH CONVICTION
Thesis: Effective monopoly on actinic EUV mask blank inspection — without their tools, every High-NA EUV mask is shipped blind. ~$24B market cap is small relative to the gating role. The risk-adjusted upside in a High-NA EUV ramp scenario is asymmetric. ADR (LSRCY) is illiquid; Tokyo direct preferred.
Why above #4: Smallest mega-cap exposure to the deepest single-supplier moat in the stack. The market under-prices Japanese specialty equipment makers due to listing friction.
#4 — ASML MEDIUM CONVICTION
Thesis: EUV monopoly is permanent. Trading at ~36x P/E with TTM FCF margin ~28%. China is a real overhang (42% of 2025 sales, falling sharply). 2026 base case is only ~5% revenue growth because China decline offsets core customer +18.6%. But High-NA EUV upgrade cycle through 2028 is uncorrelated with cycle worry. Below DCF fair value of ~$1,233 vs $1,632 spot — wait, that's actually above fair value. The Trading News piece argues upside but the multiple is rich.
Why not higher: Multiple already prices in monopoly. China downside risk is real and not in numbers. Slot 4, not slot 1.
#5 — Vertiv (VRT) MEDIUM CONVICTION
Thesis: Best public exposure to the cooling/power bottleneck. FY26 organic guide 29–31%. Liquid cooling is mandatory for B200/B300/Rubin density. 50x fwd P/E is rich but the data-center thermal market is in early innings of a structural reset. Concerning: management stopped reporting quarterly backlog Q4'25, citing "lumpiness" — that's a transparency downgrade right when investors most want it.
Honest note: Modine (MOD) is the higher-beta version of the same thesis — $4B deal at 6x current DC revenue is mathematically more meaningful than any single VRT print. But VRT is the steadier compounder. Pick MOD if you want torque, VRT if you want quality.
Honorable mentions (not in top 5 but worth tracking)
- Amkor (AMKR) — small, undervalued OSAT #2 with Arizona AP fab build. If TSMC AP allocation gets rationed, overflow goes here. Best risk/reward in OSAT.
- Disco Corp (6146.T) — quiet monopoly in HBM/CoWoS dicing & grinding. Japanese listing friction = persistent discount.
- Entegris (ENTG) — quiet materials/filtration play; not yet bid up like equipment. Highest-quality compounder of the materials names.
9. What would change my mind
- Frontier-lab capex pause >6 months. If Anthropic/OpenAI/Meta/xAI collectively pull back GPU orders, CoWoS lead times compress fast and the bid evaporates. Watch hyperscaler Q4 capex commentary.
- Real algorithmic efficiency breakthrough. A model that achieves GPT-5-class capability on 1/10 the compute kills the supply/demand gap. Possible but historically Moore's-Law-for-models has been "more compute = more capability" not "less."
- HBM yield breakthrough at Samsung. If Samsung qualifies HBM4 at NVDA in volume (already qualified in Q1'26 per cited source), price discipline cracks and SK Hynix's pricing power erodes.
- Intel 18A actual ramp. If Intel Foundry hits 18A volume with credible yields by H2 2026, TSMC pricing power compresses. Currently no evidence this happens — but watch for big-customer commitments (Microsoft, Apple).
- Taiwan strait incident. Tail risk; not investable as base case but warrants partial geo-diversification (ASML, Samsung, Intel Foundry hedges).
- China EUV breakthrough. SMEE/Huawei prototypes claimed at ~2028. If credible by 2027, ASML's China discount cap goes from "decline" to "structural loss." Currently 10–15 years behind on light source per cited assessment.
- Co-packaged optics actually hits. If silicon photonics CPO ramps in 2027 as some Marvell/Broadcom slides claim, Lumentum/Coherent transceiver demand could compress fast. Watch hyperscaler CPO RFPs.
10. Sources & date
Analysis date: 2026-05-26. All prices and market caps are as of market close that date except where noted.
- Silicon Analysts — TSMC Foundry Allocation Q1 2026 (CoWoS lead times)
- TrendForce — TSMC AI wafer demand 11x growth, CoWoS roadmap
- MomoView — HBM Three-Way War (HBM4 pricing, market share)
- SK Hynix — 2026 Memory Supercycle outlook
- Trading News — ASML EUV monopoly & 2026 outlook
- Finsee — Vertiv Q1 2026 earnings review
- Panabee — Amkor Q1 2026 earnings
- Motley Fool — Modine $4B hyperscaler deal
- Futurum — Marvell Q1 FY26 custom silicon
- StockAnalysis — TSMC, ASML, AMAT, LRCX, KLAC, COHR, LITE, FN, ALAB, VRT, SNPS, CDNS, ENTG, AVGO market caps
- DataInsights — Lasertec data
- StockAnalysis — Tokyo Electron
- StockAnalysis — SK Hynix
- AlphaSense — top semi market caps 2026