UACJ Corporation
5741.TMEDIUMScore: 35Battery Materials / Aluminum Cathode Current Collector Foil · Weight: 2%· Data as of 2026-06-04
Investment Thesis
Aluminum foil is the ONLY material for lithium-ion battery cathode current collectors — no substitutes exist. UACJ Foil (subsidiary) is the ONLY Japanese manufacturer producing both cathode AND anode foil for Li-ion batteries, with ±0.5 μm precision thickness control for automotive applications. As Honda (via LG Energy Solution) scales 2170-format cylindrical cell production for Vietnam e:Swap (50→1,000 stations by 2027) and Panasonic scales MPP cells for Honda's global Gachaco expansion, demand for precision battery aluminum foil grows proportionally to cell volumes. UACJ Foil's Japan-origin supply is strategically valuable to ex-China battery makers (LG, Panasonic, Samsung SDI) seeking supply chain diversification. PE 15.46x, PBR 1.73x, ROE 11.21% — reasonable valuation for a structural materials moat.
Risk
1) PEAK EARNINGS RISK: FY2026 NI +39% (¥38.8B) but FY2027 NI guided DOWN to ¥28B (-28%) — overall UACJ business is cyclical (aluminum auto body panels, packaging). Core battery foil growing but cannot offset broader aluminum cycle headwinds. 2) Chinese/Korean competitors: Longchuang (China), POSCO (Korea) also produce battery aluminum foil — UACJ's Japan premium may not hold if quality gap narrows. 3) Revenue ¥1.18T is mostly non-battery aluminum products (auto panels, packaging, construction) — battery foil may be <15% of total. 4) LFP batteries use slightly different aluminum foil specifications vs NMC — Honda's UC3 LFP switch may require spec validation.
Monitoring Trigger
Add on dip if: UACJ Foil announces new battery customer contract or capacity expansion. Trim if: FY2027 NI decline confirmed >30% (aluminum cycle peak confirmed). Exit if: Chinese aluminum foil makers win Honda MPP cell supplier qualification (quality gap eliminated).
Key Dates
Key Metrics
Business Segments
| Segment | Revenue | Share | Description |
|---|---|---|---|
| UACJ Foil (Battery Foil) | est. ¥120-200B | est. 10-17% | Aluminum and copper foil for Li-ion battery cathode and anode current collectors. Precision ±0.5 μm. Automotive grade. Only Japanese maker of BOTH foil types. Customers include Japanese and Korean battery cell makers. |
| Flat Rolled Products (Auto/Industrial) | est. ¥800-900B | ~75% | Aluminum sheet for automotive body panels (EV and ICE), construction, industrial use. Cyclical, correlated with automotive production volumes. |
| Packaging / Other | est. ¥100-200B | ~10-15% | Aluminum foil for food packaging, pharmaceutical packaging. Stable demand. |
Supply Chain Evidence
| Evidence | Customer | Product | Detail |
|---|---|---|---|
| probable | Panasonic Energy (Honda MPP cells) | Aluminum cathode current collector foil for cylindrical Li-ion cells | Panasonic Energy manufactures Honda MPP batteries (confirmed Honda relationship) using cylindrical Li-ion cells. All Li-ion cathodes require aluminum current collector foil. UACJ Foil, as Japan's premier battery aluminum foil maker (only dual cathode+anode maker), is the natural Japan-origin supplier for Panasonic Energy's Honda MPP cell production. |
| probable | LG Energy Solution (Honda Vietnam e:Swap cells) | Aluminum cathode current collector foil for 2170 cylindrical NMC cells | LG Energy Solution supplies 2170 cylindrical NMC cells for Honda-LG Vietnam e:Swap network (50 stations Q3 2026, 1,000 by 2027). LG Energy Solution has diversified its current collector foil supply chain; UACJ Foil supplies Japan-origin aluminum foil to Korean battery makers seeking supply chain resilience. |
| inferred | Honda Motor (UC3 LFP battery) | Aluminum foil for LFP cathode current collector | Honda UC3 uses Honda's first fixed LFP battery (3.17 kWh). LFP cathodes require aluminum current collector foil (no substitute). UACJ Foil's automotive-grade specialty foil is the most likely Japan-origin supply source for Honda's LFP battery pack assembly. |