Topic

HBM Memory

MarketCompaniesProductsHiringPersonasStrategy

HBM-SUPPLY-ANALYST-01

Supply-chain analyst at memory vendor / sell-side covering HBM allocation politics.

Audience

  • · 6-15
  • Current: Supply Chain Analyst / Memory-cycle Analyst
  • Pain: SK Hynix vs Samsung vs Micron allocation share data lag
  • Pain: Hyperscaler buying contract terms not disclosed

Product Needs

(none)

Channels

(none)

Competitor Lens

(none)

Fit Score weights — adjust to your priorities

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Top 5 for this segment
  1. 1. TSMC60/100
  2. 2. SK Hynix58/100
  3. 3. Micron Technology55/100
  4. 4. ASE Technology54/100
  5. 5. Samsung Electronics54/100

Full Persona Brief

Supply-chain analyst at memory vendor / sell-side covering HBM allocation politics

Audience Profile

  • Age / Experience: 6-15 years in industry
  • Current role: Supply Chain Analyst / Memory-cycle Analyst at memory vendor / sell-side research / hedge fund
  • Top pain points:
  • SK Hynix vs Samsung vs Micron allocation share data lag
  • Hyperscaler buying contract terms not disclosed
  • CoWoS bottleneck flow-through to HBM demand
  • Top decision blockers:
  • Channel-check reliability + survivorship
  • Customer concentration disclosure limits

What This Segment Needs

  • Information: Real-time HBM allocation share across SK Hynix/Samsung/Micron; CoWoS wpm trajectory; hyperscaler contract structure intelligence; BIS HBM2E+ export-control delta tracking.
  • Tools: Triangulation models linking CoWoS wpm → HBM stack output → accelerator BOM; channel-check audit ledger with source-survivorship scoring; bin-yield (8-hi vs 12-hi) reconstruction worksheets.
  • Services: Primary-source check network into Hsinchu/Icheon/Pyeongtaek fabs; quarterly capacity-reconciliation reports cross-referencing TSMC CoWoS guidance against HBM vendor shipments.

Top 5 Companies for You (Fit Score)

| Rank | Company | Score | Why | |------|---------|-------|-----| | 1 | TSMC | 85/100 | CoWoS doubled to ~75,000 wpm by end-2025, guided ~2x in 2026 — the single most important supply variable for HBM. FY2025 revenue +34% YoY; HPC 57% of wafer rev; NVIDIA Rubin + Micron HBM4 base-die wins enable cross-customer triangulation. | | 2 | SK Hynix | 83/100 | Q3 2025 revenue 24.4T KRW, HBM >40% of DRAM; world-first HBM4 dev completed 2025-09-26; HBM3E 12-high shipped to NVIDIA March 2025. TSMC HBM4 base-die MoU (April 2025) unlocks 3nm logic exposure. M15X live Nov 2025. | | 3 | Micron Technology | 78/100 | FQ4 2025 $11.3B, data center +100% YoY, HBM run-rate >$8B, HBM3E sold out CY2025; HBM4 36GB 12-high sampled 2025-06-10 at >2.0 TB/s (+60% vs HBM3E); GB300 design-in = 18-24mo visibility. Two CFO transitions in <12 months. | | 4 | ASE Technology | 78/100 | Q3 2025 NT$165.8B (+11% YoY); 2026 advanced-packaging guided ~10% of ATM (2x 2024). US$1.6B K28 capex announced 2025-09-10. NVIDIA GTC 2025 HBM3E back-end partner — merchant 2.5D/3D triangulation point. | | 5 | Samsung Electronics | 77/100 | NVIDIA HBM3E 12-high qual passed 2025-09-04 with Q4 2025 shipment start; OpenAI Stargate LOI 2025-10-01; ~20T KRW P4 Phase 2 capex for HBM4/1c. Q2 2025 OP -55% YoY tied to HBM3E qual delay — the canonical single-customer gating case. |

Deal-Breakers (Your Hard Preferences)

No hard preferences declared for this segment.

How to Evaluate Any Company in this Niche (Checklist)

  • [ ] Check growth signals: Quarterly CoWoS wpm count + HBM revenue as % of DRAM mix (>30% = meaningful AI leverage); cross-check vs TSMC's CoWoS guide.
  • [ ] Check comp data: Levels.fyi memory-design bands + Korea/Taiwan tax-equalized base; sell-side memory analyst comp via H1B Salary DB + Glassdoor cross-reference.
  • [ ] Check learning signals: Count distinct senior packaging/HBM specialties posted in a 90-day window (TSV, hybrid bonding, KGSD, SI/PI ≥4 = healthy R&D bench).
  • [ ] Check stability signals: Single-customer qualification gating exposure (Samsung Q2 2025 -55% OP is the warning case); CFO turnover frequency; BIS export-control revenue gating %.
  • [ ] Check culture signals: Ask interviewers — "Walk me through the last channel-check that contradicted your house model and how it propagated to the allocation forecast." A vague answer = primary-research function is thin.
  • [ ] Check geopolitical hedging: Disclosed onshore capex (e.g. TSMC's $165B Arizona commitment, March 3 2025) as a Taiwan-Strait tail-risk offset.

Reverse-Hype Watch

  • ASE US$1.6B K28 capex is forward-loaded against Blackwell/HBM4 — a ramp slip turns this into 2026-2027 depreciation drag.
  • ASE names only NVIDIA Blackwell HBM3E publicly; no second-hyperscaler back-end customer disclosed despite the 2026 ~10% ATM AI guide.
  • Samsung HBM4 March 2026 sample-shipment language "positioning for qualification with NVIDIA and AMD" echoes pre-slip HBM3E messaging that delayed 3+ quarters.
  • OpenAI Stargate LOI cites "up to 900,000 DRAM wafers/month combined with SK Hynix" — combined-vendor capacity, no Samsung-specific allocation share.

**Under-reported for this segment:** HBM **bin-yield split between 8-high vs 12-high stacks** drives unit economics far more than headline stack-count, but vendors only disclose qualification milestones, not bin-out rates. Likewise, **CoWoS-L vs CoWoS-S substrate-mix flow-through** to per-accelerator HBM count is rarely modeled publicly — analysts who build this dis-aggregation own the seat.