Evolve DD — 2026-05-03
2026-05-03 19:16 · 17 KB
Stocks: Rohm (6963.T) · Renesas (6723.T) · DISCO (6146.T)
*Deep evolution round. Research date: 2026-05-03. All three stocks had data_date 2026-04-12 (21 days stale) with imminent earnings catalysts.*
Executive Summary
| Ticker | Name | Theme | Prior Conviction | Updated | Thesis Status |
|---|---|---|---|---|---|
| 6963.T | Rohm Co. | EV / Power Semi | LOW | LOW → HOLD | Thesis pivot: pure-play SiC → Japan power semi consolidation anchor |
| 6723.T | Renesas Electronics | Semi / AI | MEDIUM | MEDIUM (upgrade signal) | Auto recovery confirmed Q1 2026; GF partnership; HOLD pre-May 8 |
| 6146.T | DISCO Corp | Semi / AI | MEDIUM | MEDIUM (upgrade signal) | FY2026 6th consecutive record; Q1 FY2027 re-acceleration guided |
Rohm Co. (6963.T) — EV / SiC Power Semiconductor
What Changed Since April 12
Most important: Three-way Japan power semiconductor merger MOU (March 27, 2026)
Rohm signed an MOU with Toshiba Electronic Devices & Storage (TDSC) and Mitsubishi Electric's power device business to discuss business integration. Combined entity would hold ~10% global power semiconductor market share — No. 2 globally after Infineon (17%). Complementary tech stack: Rohm SiC + Toshiba Si MOSFET + IGBT + Mitsubishi IGBT/modules. METI has already approved ¥129.4B ($900M) in subsidies for Rohm + Toshiba power semiconductor manufacturing collaboration. This is a government-backed consolidation move — the thesis is no longer "pure-play SiC" but "anchor of Japan's power semiconductor national champion."
Denso acquisition bid collapsed (April 25–28, 2026)
Denso proposed ~¥1.3T ($8.3B) acquisition of Rohm in March 2026 (~4.98% existing stake). Rohm management rejected, citing the three-way merger as the preferred strategic path. Denso withdrew April 28. Stock fell 16% on April 27 — the M&A premium has been removed. The stock's 52-week range is ¥2,247–¥3,890; it is currently trading near ¥3,431.
Supply chain corrections
- Tesla: REMOVED. Tesla Model 3 uses STMicro, not Rohm. This was an error.
- Toyota bZ5: ADDED CONFIRMED. Rohm 4th Gen SiC MOSFET in traction inverter. Mass production from HAIMOSIC (Shanghai) JV, 360k units/year. (Source: Semiconductor Today, June 2025)
- Schaeffler: UPGRADED to mass production. 800V inverter brick using Rohm SiC MOSFET in mass production since September 2025. Customer: unnamed major Chinese automaker.
5th Gen SiC MOSFET announced (April 21, 2026)
30% lower on-resistance at high temperature vs 4th Gen. Discrete/module samples available July 2026. Roadmap: Gen 6 (2027), Gen 7 (2029). Targets: xEV traction, OBC, AI server PSUs.
Wolfspeed tailwind
Wolfspeed filed Chapter 11 June 2025, emerged September 2025. Rohm is a primary beneficiary for customer requalification. Wolfspeed's market position weakening long-term.
FY2026 earnings date corrected: May 12 (not May 8)
Nikkei preview article suggests actual FY2026 net income ~¥7B — below company guidance of ¥10B (raised Feb 2026) and well below analyst consensus of ~¥14.1B. Cause: heavier-than-expected SiC quality assurance costs in Q4 (tied to automotive mass-production qualification). These are described as temporary. Watch at May 12: actual NI, FY2027 guidance, SiC quality cost resolution timeline, merger JV structure update.
Updated Metrics (May 2026)
| Metric | Apr 12 | May 3 | Source |
|---|---|---|---|
| Market Cap | ¥1.41T | ¥1.35T | companiesmarketcap, Apr 28 |
| P/B | 1.52x | 1.37x | IRBank, Mar 2026 |
| Forward PE | 55.75x | ~125x | IRBank/Simply Wall St |
| Op Margin | -4.1% | +1.6% (Q3 FY2026) | TDnet Q3 filing, Feb 2026 |
| FCF | -¥44B | Still negative | Capex investment cycle |
Anti-Pattern Check
- Peak Earnings: CLEAR — FY2026E NI ¥7-10B vs historical peak ~¥50B+. Early recovery.
- Capacity Hangover: FLAG — ¥180B/yr capex peak drove largest-ever operating losses. Pulled back to ¥50B/yr. SiC quality assurance costs in Q3-Q4 FY2026 are hangover symptoms. Capex reduction now confirmed.
- Concept Stock: MONITOR — SiC is ~20-22% of group revenue (discrete 44% × SiC ~50% within). Three-way merger would further dilute SiC exposure.
Valuation Guardrails
- P/B 1.37x: No peak concern — actually below typical floor for Japanese industrials.
- Forward PE ~125x: Appropriate for cyclical trough — buying near-breakeven with recovery to >20% OP margin target by FY2028. Catalyst named: Toyota bZ5 ramp + Schaeffler ramp + Wolfspeed customer wins.
Thesis (Updated)
Anchor participant in Japan's government-backed power semiconductor consolidation (Rohm + Toshiba TDSC + Mitsubishi Electric MOU; METI ¥129.4B subsidy). Combined entity targeting No. 2 globally. SiC recovery intact: Toyota bZ5 in mass production, Schaeffler 800V inverter in mass production, Wolfspeed tailwind. Gen 5 SiC MOSFET sampling July 2026. FY2028 target: >20% OP margin, SiC breakeven.
Thesis breaks if: FY2026 NI <¥7B (SiC quality costs structural); three-way JV collapses; China SiC achieves automotive qualification at scale by 2027; FY2027 OP margin guidance <10%.
Risk Flags
- AP02 triggered: Capacity expansion hangover — peak ¥180B/yr capex cycle drove operating losses. SiC quality assurance costs in Q4 are residual hangover effect.
- Earnings miss risk: Nikkei preview ¥7B NI vs ¥10B guide. Q4 likely weaker than planned.
- Denso premium removed: Stock -16% on Apr 27; fair value now purely on fundamentals.
Renesas Electronics (6723.T) — Automotive MCU / AI Data Center
What Changed Since April 12
Q1 2026 results already reported (April 24) — strong beat
- Revenue: ¥380.3B IFRS (+23.2% YoY) — beat consensus ¥368.9B
- Operating profit (Non-GAAP): ¥102.9B; OP margin 33.7% (above management's 25-30% LT target)
- Automotive: +10.6% YoY; channel inventory fell vs plan in Q1 (demand-pull signal)
- H1 2026 guidance: Revenue ~¥760B (+20% YoY), OP margin 31.3%
- Q2 guided: OP margin ~29% (FX/mix headwind, still healthy)
- Note: GAAP "EPS miss" headlines were a GAAP/Non-GAAP definitional artifact. Underlying business strong.
GlobalFoundries expanded US manufacturing partnership (February 2026)
Multi-billion USD partnership for FDX/BCD/CMOS tape-outs starting mid-2026. US fabs, Germany, Singapore. Explicit rationale: tariff resilience, US supply chain credibility. Proactive hedge vs Section 232 risk. Renesas becomes a "made in USA" option for MCU supply chains.
RH850/U2C 28nm new MCU (March 4, 2026)
32-bit automotive MCU targeting ASIL-D: chassis/safety, BMS, body control, zonal ECU architectures. Extends RH850 roadmap to 28nm from 40nm. Direct response to EV/BMS growth and Toyota zonal ECU adoption.
R-Car X5H (3nm) sampling with Bosch and ZF
World's first 3nm automotive multi-domain SoC. Silicon sampling shipping to select customers. Bosch (CES 2026 fusion demo) and ZF (joint ADAS showcase) engaged — pre-production design stage. Production vehicles 2029-2031.
Automotive cycle position: early recovery, not peak
FY2025 automotive revenue -9% YoY (trough). Q1 2026 +10.6% — first recovery quarter. Channel inventory lean and falling. S&P Global projects 16.5% YoY auto semiconductor growth through 2026.
May 8 is H1 guidance reaffirmation, not new quarterly results
The key event on May 8 is confirmation of H1 2026 guidance already disclosed. Watch for: Q2 OP margin vs 29% guided; any China MCU commentary.
Updated Metrics (May 2026)
| Metric | Apr 12 | May 3 | Source |
|---|---|---|---|
| Market Cap | ¥4.82T | ¥5.29T | TradingView, May 2026 |
| P/B | 1.97x | 2.29x | Multiple sources |
| Op Margin | 17.9% | 33.7% Non-GAAP Q1 | Renesas Q1 2026 earnings call |
| FCF | +¥364B | +¥364B confirmed | GuruFocus (OCF ¥453B - capex ¥89B) |
| Forward PE | 17.78x | 16-18x | Analyst consensus |
Anti-Pattern Check
- Peak Earnings: CLEAR — FY2025 automotive -9% trough. Q1 2026 is first recovery quarter.
- Capacity Hangover: CLEAR — fabless/fab-lite; GF is outsourced capacity, no greenfield risk.
- Concept Stock: CLEAR — 48.5% automotive + 50.9% industrial genuine exposure. GaN AI growing but still modest.
- China MCU Erosion: EMERGING — CEO cited 28nm MCU headwind in China. GigaDevice/SemiDrive/AutoChips targeting domestic substitution. 2-4 year risk (China ~40% of Asia-Pacific revenue).
Valuation Guardrails
- P/B 2.29x: Moderate for #1 global auto MCU with 33.7% Non-GAAP OP margin and FCF ¥364B. Not at cyclical peak.
- FCF yield ~6.9%: Strong cash generation supports valuation.
Thesis (Updated)
#1 auto MCU globally (~18% share). Auto cycle early recovery confirmed Q1 2026 — channel inventory lean, demand-pull. R-Car X5H world's first 3nm automotive SoC sampling with Bosch/ZF. AI data center GaN growing 2x YoY via NVIDIA 800V partnership. GF partnership de-risks tariff exposure. FCF ¥364B at ~6.9% yield. China MCU share erosion is the key medium-term risk.
Thesis breaks if: China revenue declines >15% in H1 2026; R-Car X5H loses Bosch/ZF engagement; GaN AI data center stays <3% of Industrial/IoT by end 2027; Q2 OP margin comes in materially below 29% guided.
DISCO Corp (6146.T) — Semiconductor Dicing / Grinding Equipment
What Changed Since April 12
FY2026 full-year results released April 22 — 6th consecutive record
- Revenue: ¥436.9B (+11.1% YoY)
- Operating profit: ¥185.0B (+10.9% YoY); OP margin 42.3% (beat consensus ~3%)
- Annual dividend raised 22%: ¥413 → ¥505/share (management confidence signal)
- Capex nearly doubled: ¥33B → ¥70B (building for orders already in hand)
Q1 FY2027 guidance (Apr–Jun 2026) — RE-ACCELERATION
- Revenue: ¥106.1B (+18.0% YoY)
- Operating profit: ¥42.0B (+21.8% YoY)
- Net income: ¥29.5B (+24.1% YoY)
- Shipments: quarterly record high forecast
- Re-accelerates after FY2026 growth deceleration (28% → 11%) — removes near-term downside risk
FCF now confirmed: +¥63.7B
Operating CF ¥133.5B minus capex ¥69.8B. (Total investing CF appears near-zero due to fixed deposit movements — capex-based FCF is the correct measure.) FCF yield ~0.85% at ¥7.5T market cap — thin but positive.
CoWoS 3.7x expansion through end 2026
TSMC CoWoS capacity: 35k wpm → 130k wpm target by end 2026. ~3-4 dicers per 10k wpm incremental capacity implies ~27-36 additional DISCO dicers for TSMC alone.
HBM supercycle intact
2026 HBM market: $54.6B (+58% YoY). Samsung +50% HBM capacity. SK Hynix M15X + Yongin mega-fab: >400k wpm capacity addition 2026-2027 (→ ~120-160 additional dicers). HBM4 transition adds dicing complexity. Cumulative HBM purchase commitments exceed 3 years. DISCO confirmed "HBM grinding is currently DISCO monopoly supply."
Intel glass substrate: new supply chain opportunity
DISCO's proprietary "pull-back method" for SeWaRe defect elimination is the key solution for glass substrate singulation. Intel advancing glass substrates + EMIB packaging. Samsung Yokohama packaging R&D center (opening March 2027) deepens Japan equipment relationships.
Laser saw milestone: 4,000 cumulative shipments in 2025 (vs 1,000 in 2014, 2,000 in 2019) — accelerating adoption.
Earnings date note: The April 12 data listed "May 12 earnings" — this was incorrect. FY2026 full-year results were released April 22. The next earnings event is Q1 FY2027 results (around July 2026).
Updated Metrics (May 2026)
| Metric | Apr 12 | May 3 | Source |
|---|---|---|---|
| Op Margin | 41.7% | 42.3% | TDnet FY2026 filing, Apr 22 |
| FCF | N/A | +¥63.7B | irbank.net CF history |
| Market Cap | ¥7.26T | ¥7.5T | Yahoo Finance JP |
| Forward PE | 44.98x | ~43x | Q1 FY2027 guidance |
| Div Yield | 0.7% | 0.66% (¥505) | TDnet, Apr 22 |
| P/B | 13.37x | ~13.4x | Yahoo Finance JP |
Anti-Pattern Check
- Peak Earnings: MONITOR — 6th consecutive record with growth decelerating (28%→11%). Q1 FY2027 re-acceleration (+18%) is meaningful but one quarter. Not a clear peak trap signal — orders/shipments still at records.
- Capacity Hangover: CLEAR — dicing market $0.88B total is small, disciplined oligopoly. DISCO capex doubled but building for orders in hand.
- Concept Stock: CLEAR — DISCO IS the AI packaging infrastructure. 70%+ dicing market share, HBM grinding monopoly, structurally embedded in every CoWoS wafer and HBM module.
Valuation Guardrails
- P/B ~13.4x approaching historical peak 15.47x: TRIGGERED. Current P/B within ~15% of all-time high (set in FY2025). Priced for perfection. FCF yield 0.85% provides no cushion. If growth decelerates, multiple compression risk is significant.
- Morningstar DCF fair value ¥17,891 vs current ¥72-76k — represents a severe outlier (DCF methodology is notorious for undervaluing moat businesses). Not actionable but noted.
Thesis (Updated)
~70%+ global dicing/grinding share. FY2026 6th consecutive record (¥436.9B, 42.3% OP margin). Q1 FY2027 re-acceleration guided (+18%/+21.8%). CoWoS 3.7x expansion implies ~27-36+ additional DISCO dicers for TSMC alone. HBM supercycle: $54.6B 2026 (+58% YoY), grinding monopoly confirmed. New: Intel glass substrate singulation opportunity (proprietary SeWaRe method). FCF +¥63.7B confirmed.
Thesis breaks if: CoWoS capacity ramp stalls (TSMC capex cuts); HBM demand collapses post-AI capex peak; HANMI achieves >10% share at Samsung HBM dicing; P/B exceeds historical peak 15.47x — reduce position.
Risk Flags
6963.T Rohm
- AP02 Capacity Hangover: ¥180B/yr peak capex cycle → largest-ever operating losses. SiC quality assurance costs in Q3-Q4 FY2026 are residual hangover symptoms. Now pulled back to ¥50B/yr.
- Earnings miss risk: Nikkei preview ¥7B net income vs ¥10B guidance and ¥14.1B analyst consensus.
- Merger execution risk: Three-way JV still in MOU/discussion — structure, valuation, and timeline TBD.
- Guardrail: FCF still negative. FCF growth projection requires named catalyst (Toyota bZ5 ramp + Wolfspeed requalification wins = named).
6723.T Renesas
- China MCU erosion: CEO-flagged 28nm MCU headwind. GigaDevice/SemiDrive pursuing domestic substitution. 2-4 year structural risk.
- Q2 margin step-down: OP margin guided 33.7% (Q1) → 29% (Q2) due to FX and OpEx ramp.
- No guardrails triggered: P/B 2.29x, FCF yield 6.9%, early-cycle positioning all within normal range.
6146.T DISCO
- PB guardrail triggered: P/B ~13.4x vs historical all-time peak 15.47x. Above 80th percentile of historical range. Override: monopoly moat + HBM supercycle + Q1 FY2027 re-acceleration justify premium but ceiling is visible.
- AP01 watch: 6th consecutive record with decelerating growth. Monitor Q1 FY2027 actuals (July 2026) for trend confirmation.
Sources
- Rohm Q3 FY2026: https://fscdn.rohm.com/en/financial/financial-report/2512_financialresults_en.pdf
- Rohm 5th Gen SiC: https://www.rohm.com/news-detail?news-title=2026-04-21_news_sic-mosfet
- Rohm Suchi India: https://www.rohm.com/news-detail?news-title=2026-03-03_news_suchi
- Toyota bZ5 design win: https://www.semiconductor-today.com/news_items/2025/jun/rohm-230625.shtml
- Schaeffler mass production: https://www.rohm.com/news-detail?news-title=2025-09-04_news_schaeffler
- Toshiba MOU: https://www.global.toshiba/ww/news/corporate/2026/03/news-20260327-01.html
- EE Times merger: https://www.eetimes.com/rohm-joins-toshiba-and-mitsubishi-to-create-a-power-chip-titan/
- Denso withdrawal: https://eetimes.itmedia.co.jp/ee/articles/2604/28/news076.html
- Renesas Q1 2026: https://www.powersemiconductorsweekly.com/2026/04/24/renesas-reports-solid-q1-2026-profitability-with-strong-margins/
- Renesas Q1 transcript: https://www.investing.com/news/transcripts/earnings-call-transcript-renesas-misses-eps-beats-revenue-in-q1-2026-93CH-4634530
- Renesas H1 forecasts: https://www.businesswire.com/news/home/20260423971402/en/Renesas-Announces-Consolidated-Forecasts
- GF-Renesas partnership: https://www.globenewswire.com/news-release/2026/02/16/3238908/0/en/GlobalFoundries-and-Renesas-Expand-Partnership-to-Accelerate-U-S-Semiconductor-Manufacturing.html
- Renesas RH850/U2C: https://www.businesswire.com/news/home/20260304894850/en/Renesas-Expands-Auto-MCU-Portfolio-with-28nm-RH850U2C-for-Vehicle-Control-and-Automotive-Safety-Applications
- DISCO FY2026 results: https://finance.biggo.jp/news/jpx_tdnet_140120260420506569
- DISCO Q1 FY2027 guidance: https://s.kabutan.jp/news/n202604221175/
- TSMC CoWoS 130k capacity: https://markets.financialcontent.com/stocks/article/tokenring-2026-2-5-tsmc-to-quadruple-advanced-packaging-capacity-reaching-130000-cowos-wafers-monthly-by-late-2026
- HBM 2026 market: https://www.trendforce.com/news/2025/12/30/news-samsung-reportedly-plans-50-hbm-capacity-surge-in-2026-spotlight-on-hbm4
- DISCO historical PBR: https://irbank.net/6146/pbr
- DISCO CF history: https://irbank.net/E01506/cf
*Disclaimer: This is internal research documentation, not investment advice. All figures sourced from Tier 1-2 sources as defined in research_philosophy.md. Supply chain links marked confirmed have source_url citations.*