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52/100
Disco: A Long-Term Business Owner's View
Disco is Japan's leading back-end semiconductor equipment maker, specializing in the three high-precision, mission-critical steps of wafer dicing, grinding, and polishing, with an integrated equipment-plus-consumables-plus-service model that benefits deeply from AI/HBM and advanced packaging demand. FY2025 net profit was roughly 135.5 billion yen, overseas sales made up 87.6% of the total, the balance sheet carries long-term net cash, gross margins are exceptionally high, and management runs the business against a four-year RORA discipline. Rating Watch: a superb business whose current price already prepays years of high-growth, high-margin, AI-driven expectations, leaving little margin of safety.
45/100
80Buffett
Chroma ATE Value Investment Deep-Dive
Chroma ATE is Taiwan's leading test and measurement equipment company, with core businesses in semiconductor testing, power electronics testing for EVs, energy storage and power supplies, and automated optical inspection equipment. Q1 2026 revenue grew 73% year over year and May revenue grew 133% year over year, but 2025 reported profit included a large one-off capital gain, leaving true owner earnings at roughly NT$4.3 billion after adjustment. Rating Avoid: a strong business is being priced as if years of high growth are already guaranteed, leaving almost no margin of safety.
43/100
67Buffett
Lenovo Group (0992.HK) Zen Horizon Framework Deep-Dive Research
Lenovo Group is the world's largest personal computer (PC) vendor, ranking first by IDC's 2026 Q1 share at 25.2%, and its Hybrid AI strategy spans three business groups: Intelligent Devices Group (IDG, about 70% of revenue), Infrastructure Solutions Group (ISG, AI server business), and Solutions and Services Group (SSG). FY2025/26 revenue, through March 2026, reached a record USD 83.1 billion, up 20.3%, with AI-related revenue doubling to 33% of the group, ISG turning profitable for the first full year, and the company ending the year in a net cash position. Research rating Watch: a good asset with a sound balance sheet, but 2026 PC-market headwinds, thin AI-server margins, and sell-side consensus targets below the current price leave a negative margin of safety.
48/100
63Buffett
Siemens AG (SIE.XETRA) Zen Horizon Research Report
Siemens AG is a global leader in industrial automation and digitalization, headquartered in Munich and primarily listed on Xetra, with four engines: Digital Industries, Smart Infrastructure, Mobility, and a roughly 67% stake in Siemens Healthineers that is now moving toward deconsolidation. The core thesis is that Siemens has a rare full-stack industrial technology moat and direct exposure to AI data-center electrification, but FY2025 net income included a one-off Innomotics gain and valuation is no longer cheap at a TTM PE of 27.7x. Research rating Watch: wait for clearer evidence of a DI cycle recovery, durable SI data-center orders, and Altair/Dotmatics synergies before moving into a buy range.
48/100
Prysmian Group (PRY.MI) Zen Horizon Research Report
Prysmian Group is the global leader in power cables and systems, primarily listed on Euronext Milan and spanning submarine/underground high-voltage transmission, power grids, electrification including industrial and construction, specialty cables, and digital solutions for data centers and fiber. FY2025 revenue reached €19.65B (+15.4% nominal / +5.4% organic), net profit attributable to shareholders was €1.27B (+74%, including roughly €346M of one-off gains from the YOFC stake sale), Adj EBITDA was €2.40B at a 14.2% margin on standard metal prices, Transmission delivered a full-year 18.3% margin ahead of its 2028 target with backlog above €17B, and the 2024 USD 4.2B Encore Wire acquisition strengthened North America. Research rating Watch: a high-quality leader with powerful long-term drivers, but current valuation already prices in much of the good news.
55/100
34Buffett
Sea Limited（SE.US）Zen Horizonレポート
Sea Limitedはシンガポールに本社を置きNYSEに上場する東南アジア最大のインターネットプラットフォームで、Shopee（Eコマース）、Monee（デジタル金融）、Garena（ゲーム、Free Fire）の三エンジンを並走させている。FY2025は売上高229億米ドル（+36%）、GAAP純利益16億米ドル（+260%）と初めて本格的な規模での黒字化を達成し、Shopeeは東南アジアGMVの約53%を握って全6市場で首位、Moneeの貸付残高は1年で71%増の99億米ドルに達した。2026年Q1の売上高は+47%へさらに加速したものの、GAAP EPS 0.67は市場予想を下回り、株価は52週高値199から約84へ半減した。レーティングはウォッチ——ファンダメンタルズが強く妥当に評価されたコンパウンダーであり、上値余地はQ2/Q3で利益の質の持続を確認できるかにかかっている。
42/100
49Buffett
SÜSS MicroTec (SMHN): A Niche Winner in Advanced Packaging Equipment, Good Company at a Bad Price
SÜSS MicroTec is a Germany-listed semiconductor equipment company focused on temporary bonding and debonding, UV exposure, coating and development tools for advanced packaging, plus photomask cleaning and handling systems. The core thesis is that AI chips and HBM create real long-term demand for its Advanced Backend Solutions business, but 2025's record €503.2 million in sales came with negative free cash flow and management defines 2026 as a transition year. Rating Watch: a quality cyclical business with credible niche barriers, but the current price already discounts too much future success.
41/100
JSR (4185.TSE): A Leading Semiconductor Materials Company in Delisting Restructuring
JSR is a leading Japanese semiconductor materials company focused on key chipmaking materials such as photoresists, CMP slurry, and cleaning solutions, with the world's top share in ArF photoresists. The core thesis is that its electronic materials franchise is high quality, but the group is delisted, still restructuring, and burdened by weaker life sciences assets and a heavier balance sheet. Rating Watch: a potentially valuable restructuring case to track, but not an executable public-market buy today.
43/100
DeepSeek: a technically strong AI model company, with valuation already pricing in too much
DeepSeek is a frontier Chinese AI model company founded in 2023, building adoption through free Web/App access, metered API monetization, and an open-source model ecosystem. Its latest DeepSeek-V4 model was released in April 2026, with API pricing far below OpenAI and Anthropic, but the company remains a private business with no publicly audited financials and a latest media-reported post-financing valuation of roughly $52 billion to $59 billion. Rating Avoid: the business is technically impressive, but the current valuation appears to have prepaid an optimistic ten-year outcome without enough verifiable cash-flow evidence.
38/100
Cohu (COHU): A Cyclical Semiconductor Test Equipment Stock with Insufficient Margin of Safety
Cohu is a global supplier of semiconductor test equipment, spanning handlers, test interface consumables, inspection and metrology equipment, and analytics software, with recurring revenue now at roughly 60%. The core thesis is that this is a cyclical equipment business with some aftermarket stickiness, not a high-certainty compounder with a wide moat, and the 2024 and 2025 operating losses show how hard the cycle still hits. Report rating Watch: the company is worth tracking, but the current price leaves too little margin of safety for a balanced, conservative long-term investor.
48/100
45Buffett
AMEC (688012): China's Domestic Etch Equipment Leader, a Great Company at a Rich Price
AMEC is a leading Chinese high-end semiconductor equipment company, anchored in plasma etch tools and expanding into thin-film deposition, MOCVD, and adjacent platforms. Its long-term case is driven by domestic substitution and advanced-node upgrades, with 2025 revenue of about RMB 12.385 billion and net profit attributable to shareholders of about RMB 2.111 billion, but customer concentration is high and R&D spending is roughly 30% of revenue. Report Rating Watch: a valuable business whose current price already discounts a large share of future success.
40/100
Unimicron Technology from a Long-Term Owner's Perspective
Unimicron is a leading Taiwanese PCB and IC substrate manufacturer whose revenue mix has shifted toward high-end ABF substrates and HDI. The core thesis is that AI server demand may lift the cycle, but heavy capex, volatile margins, and weak free cash flow make the current price hard to justify. Research rating Avoid: a capable cyclical manufacturer, but the valuation leaves no acceptable margin of safety.
43/100
Long-Term Value Research on Murata Manufacturing
Murata Manufacturing is one of the world's largest electronic passive-component companies, centered on MLCC ceramic capacitors and inductors across communications, automotive, computers, and other applications. The core thesis is that AI and server demand is lifting capacitor orders, while FY2026 revenue of JPY 1,830.9 billion, a 15.4% operating margin, and roughly JPY 597.9 billion of net cash make Murata a hidden champion in passive components, though valuation is demanding. Research rating Watch: a high-quality business, but current pricing leaves no conservative margin of safety.
44/100
Long-Term Value Research on Ibiden
Ibiden is a global leader in high-end IC package substrates (ABF/FC-BGA), with its electronics business contributing about 59% of FY2025 total sales of JPY 416.2 billion, core customers including Intel, AMD, and NVIDIA, and a mature ceramics/DPF business alongside a heavy AI/HPC-driven expansion cycle of roughly JPY 500 billion over FY2026-28, backed by a 57.3% equity ratio and net cash of about JPY 100.4 billion. The core thesis is that Ibiden owns valuable process know-how, yield capability, customer qualifications, and an early position in AI/HPC substrates, but its capital intensity, customer concentration, and mixed business profile make the current valuation demanding. Research rating Watch: a strong company worth studying, but not a price that offers enough margin of safety today.
50/100
Long-Term Owner's Analysis of Huawei HiSilicon Ascend
Huawei HiSilicon Ascend is Huawei's AI chip and full-stack computing product line, spanning chips, servers, supernodes, software stacks, cloud services, and industry solutions. Huawei generated RMB 880.9 billion in 2025 revenue, RMB 68.0 billion in net profit, and RMB 192.3 billion in R&D spending, while Ascend had 4 million developers and 9,800+ partners by year-end 2025, making it China's primary domestic-substitution option for AI computing infrastructure. Report Rating Avoid: a strategically important business, but not a verifiable, priced, and executable value-investing security for outside public-market investors today.
37/100
Long-Term Value Analysis of AGC Inc.
AGC is a century-old Japanese materials group that began in glass and now spans architectural glass, automotive glass, electronic materials, chemicals, and life-science CDMO, with 2025 revenue of roughly JPY 2.06 trillion. The core thesis is that AGC owns several high-quality niche franchises, but group-level ROE, ROCE, and free-cash-flow durability have not yet converted those advantages into consistently high shareholder returns. Rating Watch: a credible harvest-period setup after heavy capex, but the current price does not offer a clear margin of safety.
43/100
61Buffett
Shengyi Technology Long-Term Owner's Perspective Research
Shengyi Technology is one of China's leading copper-clad laminate (CCL) producers, with about 12% global share in rigid CCL and the second-largest global position, supplying CCL, prepreg, and printed circuit boards into communications, server, and automotive electronics PCB supply chains. Revenue reached RMB 28.4 billion in 2025 and net profit attributable to shareholders reached RMB 3.3 billion, helped by a clear recovery driven by AI servers and high-speed materials demand. Research rating Avoid: a solid company, but the current price appears far ahead of verifiable long-term cash-flow value.
47/100
73Buffett
Long-Term Value Research on Taiwan Elite Material (EMC)
Taiwan Elite Material (EMC) is Taiwan's leading supplier of high-end copper-clad laminates (CCL) and laminate materials, serving PCB makers and the AI server and high-speed switch supply chains. It holds 34.4% global share in halogen-free CCL and about 13.3% overall, with a leading position in high-speed, low-loss niches; in 2025, revenue reached NT$94.3 billion, net margin was 15.5%, and ROE was 34.25%, placing its earnings quality among the stronger names in materials manufacturing. Research rating Watch: a high-quality materials leader, but today's price has pulled forward too much of the next 5 to 10 years of growth.
50/100
58Buffett
Long-Term Value Research on WUS Printed Circuit
WUS Printed Circuit is China's largest high-end printed circuit board manufacturer, focused on data communications and data-center PCBs. In 2025 it held roughly 7% of the global data communications PCB market and 10.2% of the data-center PCB market, both ranking first globally, while revenue reached RMB 18.945 billion, net profit attributable to shareholders reached RMB 3.822 billion, and five-year profit CAGR was about 38%. Research rating Watch: a strong AI-infrastructure manufacturing leader, but the current price leaves little verifiable margin of safety.
48/100
Tokyo Ohka Kogyo TOK (4186.TSE) Buffett Framework Deep-Dive Research
Tokyo Ohka Kogyo (TOK) is a key global supplier of semiconductor photoresists and high-purity chemicals, serving advanced-node foundries including TSMC. FY2025 revenue and profit attributable to owners reached record highs, the balance sheet remained in a net cash position, and the equity ratio was close to 68%, but free cash flow is still well below accounting profit during a heavy capex cycle. Research rating Watch: a high-quality semiconductor materials compounder, yet at roughly ¥9,700 the stock is already near the upper end of an optimistic valuation range and lacks a sufficient margin of safety.
50/100
HOYA Corporation (7741.TSE) Buffett Framework Deep-Dive Research
HOYA is a Japanese optical precision materials platform with two engines: Life Care, covering eyeglass lenses, contact lenses, endoscopes, and intraocular lenses, contributes 62% of revenue, while Information Technology, covering semiconductor EUV mask blanks and HDD glass substrates, contributes 38% but carries exceptionally high margins of 54%. FY2026 revenue was JPY 947.7 billion, net profit was JPY 253.1 billion, net cash was JPY 531.9 billion, and financial resilience is very strong. Research rating Watch: at the current share price of about JPY 25,835, the stock trades at roughly 38x conservative Owner Earnings, sits in the optimistic valuation range, lacks a sufficient margin of safety, and has an ideal buy range of JPY 16,000 to JPY 20,000.
38/100
Peric Special Gases (688146.SHG) Buffett Framework Deep-Dive Research
Peric Special Gases is China's leading electronic specialty gases supplier, focused on chipmaking-critical gases such as nitrogen trifluoride and tungsten hexafluoride, ranking No. 1 in China and No. 9 globally by integrated-circuit electronic specialty gas sales revenue in 2024. The core thesis is that 2025 revenue reached 2.26 billion yuan, operating cash flow remained healthy, net cash was about 2.46 billion yuan, and the balance sheet was solid, but ROE has fallen from 22% to 6%, free cash flow remains under pressure, and the current PE TTM of about 370x and PB of about 22.75x are far detached from fundamental support. Rating Avoid: a capable business whose stock price has already consumed too much of the optimistic long-term story upfront.
46/100
Shin-Etsu Chemical (4063.TSE) Buffett Framework Deep-Dive
Shin-Etsu Chemical is one of Japan's largest diversified chemical groups, anchored by world-leading semiconductor silicon wafers and lithography-related materials, with electronic materials contributing 54% of operating profit, alongside one of the world's largest PVC platforms and a silicone business. FY2026 revenue was JPY 2.57 trillion, operating margin was 24.7%, and net cash exceeded JPY 1.42 trillion, giving the company an exceptionally strong balance sheet. Research rating Watch: a high-quality compounder, but the current share price of about JPY 6,863 implies roughly 27x trailing PE and leaves insufficient margin of safety.
39/100
53Buffett
FormFactor (FORM.US) Buffett Framework Deep-Dive Research
FormFactor is a leading global supplier of semiconductor wafer-test probe cards, serving top fabs such as Intel, Samsung, SK hynix, TSMC, and Micron, with technical and relationship barriers built through early customer engagement and global delivery capability. The company benefits from strong HBM/AI demand and posted record revenue in Q1 2026, but the current share price of about $124.25 implies roughly 62 times target non-GAAP EPS, far above a conservative intrinsic value range and leaving almost no margin of safety. Research rating Watch: a high-quality niche semiconductor test leader, but the price has moved far ahead of verifiable owner earnings.