Tosoh Quartz Overview
Tosoh Quartz Corporation was founded in 1936 and was the first company to industrialize quartz glass in Japan. It is the fabrication hub of a vertically integrated quartz franchise inside Tosoh Corporation, Japan's large chlor-alkali and specialty-materials group. Sister company Tosoh SGM melts high-purity fused and synthetic silica ingots and tubes at Tosoh's Nanyo complex. Tosoh Quartz and its Taiwanese and Korean subsidiaries machine, flame-work and polish that material into chamber parts, furnace ware, rings, windows and large photomask substrates. Customers are semiconductor equipment makers, chip fabs and LCD/OLED panel makers. The company runs three plants in Yamagata Prefecture, plants in Tainan (Taiwan) and Ochang (Korea), and sales offices close to the TSMC, Samsung and SK hynix clusters. A Tosoh official in 2019 put the group's share of the roughly ¥200 billion global quartz-processing market at 20–30%. The franchise's competitive edge rests on two things: control of materials from melt to finished part, and qualification on leading-edge plasma-etch tools. Its main exposure is the memory and logic capex cycle.
What the company does. Tosoh Quartz Corporation makes and sells fabricated quartz glass (fused silica) products. It describes itself as a pioneer in making and processing quartz glass. Its products range from tiny precision parts to large LCD/OLED photomask substrates and semiconductor manufacturing components, in sizes from a few millimetres to several metres (company website, 2026). Its registered business purpose is the processing and sale of quartz glass products for semiconductor manufacturing equipment, LCD/OLED mask substrates, and medical and optical uses.
Company's own characterization. Tosoh Quartz says it has supplied high-precision quartz products since 1936. Applications have broadened from semiconductor equipment and optical, LCD and OLED panel manufacturing to medical diagnostic instruments and aerospace. The company stresses that its group includes a subsidiary that makes quartz glass from raw material. That lets it run research and development all the way from the material itself to the processing technology, which it calls a major strength (Hello Work company profile, April 2025; Yamagata Labour Bureau employer listing, July 2025).
Independent characterization. Tosoh Quartz is a mid-sized precision fabricator whose economics are driven by semiconductor wafer-fab equipment spending. It sits at the "consumables and critical spares" tier of the fab supply chain. Quartz parts in etch, deposition and diffusion chambers erode or devitrify, so fabs replace them on a regular cycle. That gives the company a recurring aftermarket stream on top of first-fit sales to equipment makers. Its biggest structural difference from independent fabricators is upstream integration. Its sister company Tosoh SGM makes the N, NP, OP and S grade silica materials. Those materials are used across the industry, so the Tosoh Quartz group is both supplier and competitor to other fabricators.
Business model and revenue mix. All disclosed revenue comes from product sales. Service, subscription or licensing revenue is not publicly disclosed. Sales go through Tosoh Quartz's own sales divisions (Tokyo, Tohoku and Hokuriku offices in Japan; Hsinchu and Seoul overseas). Tosoh Corporation also handles some sales on consignment, and Tosoh's Quartz Division markets silica glass materials globally (Tosoh Corporation Annual Securities Report FY2026; British Glass knowledge base).
Value-chain position.
Raw silica and synthetic powders: Tosoh entity: Tosoh Corporation (Nanyo complex); Role: Utilities, infrastructure, synthetic silica chemistry
Melting / ingot and tube making: Tosoh entity: Tosoh SGM Corporation (Shunan, Yamaguchi; ¥1.6 billion capital; 100% group-owned, 50% indirectly); Role: Fused silica, optical quartz glass, quartz tubes
Fabrication — Japan: Tosoh entity: Tosoh Quartz Corporation (Yamagata, Yonezawa, Sakata); Role: Semiconductor parts, LCD/OLED mask substrates, precision parts
Fabrication — Taiwan: Tosoh entity: Tosoh Quartz Co., Ltd. (Tainan; NT$150 million capital); Role: Quartzware for the Taiwanese foundry ecosystem
Fabrication — Korea: Tosoh entity: Tosoh Quartz Korea Co., Ltd. (Ochang, Cheongju; ₩3.5 billion capital); Role: Quartzware for Korean equipment makers and fabs
Fabrication — US/UK: Tosoh entity: Tosoh Quartz, Inc. (Portland, Oregon; Durham, UK; US$4.27 million capital); Role: Quartzware for US/European OEMs and fabs
Customers: Tosoh entity: —; Role: Equipment makers, device makers, photomask and panel makers, instrument makers
Customer types and end-markets.
Semiconductor equipment and fabs: Products: Etch rings, chamber liners, bell jars, diffusion and LPCVD furnace tubes, boats, flanges, windows; Main sites: Yamagata, Yonezawa, Tainan, Ochang
Flat-panel display (LCD/OLED): Products: Large photomask substrates; Main sites: Yonezawa
Optics and analytical / medical: Products: Optical cells (made since 1969), precision parts for diagnostic analyzers; Main sites: Sakata
Aerospace and other: Products: Precision quartz parts; Main sites: Sakata
In fiscal 2026 the semiconductor business softened while display recovered. Tosoh reported lower overseas shipments of quartz glass for semiconductor uses. Total quartz shipments still rose because the effects of an equipment accident affecting LCD-related production had been resolved (Tosoh Consolidated Financial Results FY2026, 12 May 2026).
Strategy
Group strategic frame. Tosoh's medium-term business plan for FY2026–FY2028 (announced May 2025) splits the group into two businesses:
Chemical Chain Business: Respond to decarbonization and global economic trends, and restructure for sustainable operations.
- Advanced Technologies Business, which includes quartz. Fully capitalize on investments from the previous plan and look for new investment opportunities for the next one.
The plan includes cumulative capital investment of ¥220–250 billion over the three years, a total shareholder return ratio of 50%, and an annual dividend of at least ¥100. Tosoh describes balancing growth with decarbonization as its most important management issue. Its prior plans named quartz glass, together with high-silica zeolite, zirconia, electrolytic manganese dioxide and sputtering targets, as a focus area. The FY2023–FY2025 plan put investment into capacity for silica glass materials and fabricated quartzware.
Quartz-specific initiatives in the last 24 months.
Yamagata Plant capacity expansion: Timing: Construction began 2024; Detail: Adds semiconductor quartzware capacity at the registered head-office site
Tainan plant expansion: Timing: 2025; Detail: Third expansion since 2019, serving Taiwanese foundry demand
Capacity built ahead of demand: Timing: FY2025–FY2026; Detail: Tosoh says it expanded capacity for semiconductor-equipment quartz in advance; current priorities are new customers and productivity to fill it
Production staffing at Yonezawa: Timing: 2025–2026; Detail: Production recruitment resumed because output is rising; roles include lapping, chamfering, sandblasting and machining-center work
Automation of production: Timing: Ongoing; Detail: Graduate engineering hires are assigned to develop automated production processes
Recruitment and employer brand: Timing: Nov 2025 – Jul 2026; Detail: LINE recruiting account (Nov 2025); website relaunch (Jul 2026); "Diamond" certifications from Yamagata Prefecture for family-friendly employment
Group-level programs affecting quartz.
-
Moved to five reportable segments from June 2026, making High-Performance Materials visible as its own segment.
-
Planned capacity increase for sputtering targets (winter of fiscal 2026); Tosoh SMD's US capacity doubling (about ¥10 billion) was slated for completion in July 2025.
-
Biomass-fired power plant at the Nanyo complex started on 8 May 2026. It supplies lower-carbon utilities to the site where Tosoh SGM melts silica.
-
Share buybacks: ¥25 billion executed in FY2026; another ¥25 billion approved in November 2026.
Guidance. In early November 2026, Tosoh raised its FY2027 guidance to net sales of ¥1.2 trillion and operating income of ¥109 billion. It cited recovering demand for semiconductor-related products, higher selling prices and a weaker yen. The ordinary-income (¥107 billion) and net-income (¥59 billion) forecasts were left unchanged, and the dividend stays at ¥100.
Products & Services
Fabricated quartzware — semiconductor (Tosoh Quartz Corporation, Tosoh Quartz Taiwan, Tosoh Quartz Korea, Tosoh Quartz, Inc.)
| Product family | Description and capabilities | Target customer | Notes |
|---|---|---|---|
| Plasma-etch chamber parts (focus rings, edge rings, liners, injectors, windows) | Machined from N/NP fused silica, whose low aluminium and bubble content suits harsh plasma etch | Etch-tool makers; fabs (replacement) | Made at Yamagata and Yonezawa; N/NP ingots up to 1,200 mm square, "450 mm wafer ready" |
| Diffusion / LPCVD furnace ware (process tubes, bell jars, flanges, wafer boats) | Flame-worked and welded tubes; opaque OP-grade flanges for heat insulation and sealing | Batch-furnace makers; fabs | OP-3HD high-density opaque grade gives longer flange sealing life in batch furnaces |
| Wafer carriers and boats | Precision-slotted carriers; Weiss pioneered computer-slotted "drop-slotted" carriers in 1982 | Fabs, OEMs | Portland heritage product line |
| Single-wafer process windows and domes | Clear fused silica for RTP and UV/IR transmission | Thermal-processing tool makers | Made from N and S grades |
Display substrates (Tosoh Quartz Corporation)
| Product | Description | Target customer | Site / year |
|---|---|---|---|
| LCD/OLED photomask substrates | Large polished synthetic and fused quartz plates for panel lithography photomasks | Photomask makers serving panel makers | Yonezawa; made since 2001 |
Precision, optical and scientific products
| Product | Description | Target customer | Site / year |
|---|---|---|---|
| Precision machined parts | Small, tight-tolerance quartz parts | Instrument and aerospace customers | Sakata Plant |
| Optical cells | Quartz cuvettes for spectroscopy and analyzers | Analytical and medical diagnostic instrument makers | Made since 1969 |
| Laboratory and medical quartzware | Parts for diagnostic equipment and research labs | Medical device and lab-equipment makers | Sakata / Yamagata |
Silica glass materials (Tosoh SGM / Tosoh Quartz Division)
| Grade | Process and properties | Main uses |
|---|---|---|
| N | High-purity silica powder fused by Tosoh's proprietary oxy-hydrogen flame process; low aluminium, very few bubbles and inclusions; Tosoh calls it a reference material | Plasma etch, metrology, optics, chemical processing, UV and high-temperature windows |
| NP | N with lower alkali content | Processes that need extreme contamination control |
| OP-1 / OP-3 | Opaque quartz glass; OP-3 has lower alkali | Furnace flanges and heat shields |
| OP-3HD | High-density OP-3 with a finer bubble-size distribution | Better sealing and longer life in advanced batch furnaces |
| S | Synthetic ultra-high-purity silica powder fused by oxy-hydrogen flame | Leading-edge semiconductor processes needing the highest purity |
| Black / heat-resistant synthetic quartz glass | High-viscosity, bubble-free synthetic glass (patent family) | High-temperature parts, light-shielding parts |
Pricing models and list prices are not publicly disclosed. Products are sold on an order-by-order basis to customer drawings and qualified specifications.
Financial Narrative
Tosoh Quartz does not publish its accounts. The tables below show Tosoh Corporation consolidated results (Japanese GAAP; Annual Securities Reports and Consolidated Financial Results, FY2022–FY2026, with aggregator line items where noted), which fund and own the quartz franchise. A separate table shows the Advanced Materials sub-portfolio that contains quartz.
Income statement
Net sales grew at a compound annual rate of 2.7% from FY2022 to FY2026.
Commentary. FY2022 was a cyclical peak: chlor-alkali and vinyl spreads were exceptional, and operating income reached ¥144.0 billion. FY2023 brought a sharp margin squeeze. Sales hit a record ¥1,064.4 billion, but costs of naphtha, coal and electricity surged and operating margin fell to 7.0%. FY2024 and FY2025 recovered as fuel costs eased and Specialty shipments grew. In FY2026, sales fell 4.1% to ¥1,019.9 billion on lower naphtha-linked prices and weak Chinese demand for chlor-alkali products. Operating income fell 3.4% to ¥95.5 billion. Net income dropped 28.3% to ¥41.6 billion, mainly because of a ¥19.1 billion impairment on the fixed assets of Tosoh SMD, Inc., the US sputtering-target maker in the same Advanced Materials portfolio as quartz. Gross profit actually edged up to ¥261.0 billion, showing that the group's specialty mix is supporting margins.
Advanced Materials sub-portfolio (contains quartz glass)
Operating income was ¥5.3 billion in FY2025 and ¥3.2 billion in Q1 FY2027. Management said in FY2026 that it had expanded capacity for quartz glass used in semiconductor equipment and for thin-film wiring materials ahead of expected demand. Semiconductor inventory adjustments delayed the recovery, so the business is focusing on new customer wins and productivity to fill existing capacity. Low reported margins reflect the early stage of that ramp and the losses at Tosoh SMD.
Balance sheet
Goodwill is minimal: ¥1.0 billion at March 2025 and ¥0.8 billion at March 2026. Tosoh's own measure of interest-bearing debt was ¥185.8 billion at March 2025 and ¥235.1 billion at March 2026. The equity ratio was 59.0% at March 2026, down from 62.3%, and 57.0% at September 2026. Book value per share was ¥2,701.46 at March 2026.
Cash flow
In FY2023, operating cash flow turned negative because inventories and receivables built up sharply after a year of high prices. Since then cash generation has recovered to ¥106–117 billion a year. Capital spending on a booked basis was ¥81.2 billion in FY2025 and ¥72.7 billion in FY2026. FY2026 was the first year of material buybacks: ¥25.0 billion. Year-end cash rose to ¥176.6 billion as Tosoh drew new long-term loans.
Ratios
Tosoh's own ROE figures, calculated on shareholders' equity, are 7.2% for FY2025 and 5.0% for FY2026. ROIC, interest coverage and the cash conversion cycle are not publicly disclosed as reported metrics. With net debt below 0.4x EBITDA and a current ratio above 2x, the parent's balance sheet is conservative. That gives it the capacity to fund quartz capacity expansions through the cycle.
Unlock Company Financials
Unlock this company profile to view its financial data.
View Subscription PlansFinancial Detail
Segment net sales (JPY Bn, external)
| Segment net sales (JPY Bn, external) | FY2025 | FY2026 |
|---|---|---|
Petrochemical | 204.8 | 169.7 |
Chlor-alkali | 373.4 | 346.0 |
Specialty (incl. quartz glass) | 270.5 | 272.9 |
Engineering | 169.3 | 186.4 |
Other | 45.4 | 44.9 |
Total | 1,063.4 | 1,019.9 |
Segment operating income (JPY Bn)
| Segment operating income (JPY Bn) | FY2025 | FY2026 |
|---|---|---|
Petrochemical | 14.3 | 9.7 |
Chlor-alkali | 9.5 | 1.9 |
Specialty (incl. quartz glass) | 38.6 | 39.9 |
Engineering | 33.6 | 40.4 |
Other | 2.9 | 3.6 |
Total | 98.9 | 95.5 |
Segment operating margin (%)
| Segment operating margin (%) | FY2025 | FY2026 |
|---|---|---|
Petrochemical | 7.0 | 5.7 |
Chlor-alkali | 2.5 | 0.6 |
Specialty | 14.3 | 14.6 |
Engineering | 19.9 | 21.7 |
Share of consolidated sales (%)
| Share of consolidated sales (%) | FY2025 | FY2026 |
|---|---|---|
Petrochemical | 19.3 | 16.6 |
Chlor-alkali | 35.1 | 33.9 |
Specialty | 25.4 | 26.8 |
Engineering | 15.9 | 18.3 |
Other | 4.3 | 4.4 |
Portfolio net sales (JPY Bn)
| Portfolio net sales (JPY Bn) | FY2025 | FY2026 |
|---|---|---|
Basic Chemicals / Basic Materials | 520.5 | 458.8 |
Value-added Chemicals / Materials | 132.0 | 131.9 |
Bioscience | 68.9 | 69.0 |
Advanced Materials (High-Performance Materials, incl. quartz) | 127.2 | 128.9 |
Water Treatment | 162.2 | 176.9 |
Portfolio operating income (JPY Bn)
| Portfolio operating income (JPY Bn) | FY2025 | FY2026 |
|---|---|---|
Bioscience | 21.2 | 19.4 |
Water Treatment | 31.1 | 37.6 |
Income Statement
| Metric (JPY Bn) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
Net sales | 918.6 | 1,064.4 | 1,005.6 | 1,063.4 | 1,019.9 |
Gross profit | 272.0 | 219.2 | 226.2 | 259.0 | 261.0 |
Operating income | 144.0 | 74.6 | 79.8 | 98.9 | 95.5 |
EBITDA | 184.7 | 117.7 | 124.4 | 146.4 | 143.6 |
Ordinary income | 160.5 | 90.0 | 95.9 | 103.0 | 106.8 |
Pre-tax income | 159.7 | 81.6 | 93.7 | 101.4 | 89.3 |
Net income attributable to owners | 107.9 | 50.3 | 57.3 | 58.0 | 41.6 |
Per share (JPY)
| Per share (JPY) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
EPS basic | 339.23 | 158.14 | 180.07 | 182.13 | 132.40 |
EPS diluted | 339.03 | 158.09 | 180.04 | 182.11 | 132.38 |
Dividend per share | 80 | 80 | 85 | 100 | 100 |
Margins (%)
| Margins (%) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
Gross margin | 29.6 | 20.6 | 22.5 | 24.4 | 25.6 |
Operating margin | 15.7 | 7.0 | 7.9 | 9.3 | 9.4 |
EBITDA margin | 20.1 | 11.1 | 12.4 | 13.8 | 14.1 |
Net margin | 11.8 | 4.7 | 5.7 | 5.5 | 4.1 |
Key Financials
| Advanced Materials (JPY Bn) | FY2025 | FY2026 |
|---|---|---|
Net sales | 127.2 | 128.9 |
Advanced Materials half-year sales (JPY Bn)
| Advanced Materials half-year sales (JPY Bn) | H1 FY2025 | H1 FY2026 |
|---|---|---|
Net sales | 65.1 | 64.6 |
Key Financials (Quarterly)
| Advanced Materials quarterly (JPY Bn) | Q1 FY2026 | Q1 FY2027 |
|---|---|---|
Net sales | 30.1 | 34.3 |
Liquidity & Coverage Ratios
| Metric (JPY Bn) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
Total assets | 1,087.7 | 1,194.3 | 1,289.9 | 1,327.3 | 1,409.0 |
Cash and deposits | 161.5 | 120.2 | 149.8 | 141.5 | 179.6 |
Short-term debt | 63.7 | 149.3 | 145.3 | 133.0 | 144.7 |
Long-term debt | 28.2 | 27.4 | 31.1 | 46.1 | 84.2 |
Total debt | 91.9 | 176.7 | 176.3 | 179.1 | 228.9 |
Net debt (negative = net cash) | -69.6 | 56.6 | 26.5 | 37.6 | 49.3 |
Net assets (incl. non-controlling interests) | 759.7 | 794.2 | 858.8 | 902.4 | 919.1 |
Intangible assets incl. goodwill | 6.9 | 10.5 | 10.5 | 14.4 | 14.5 |
Working capital | 372.4 | 371.3 | 396.4 | 420.9 | 443.5 |
Cash Flow
| Metric (JPY Bn) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
Operating cash flow | 108.6 | -16.2 | 117.0 | 106.2 | 114.6 |
Capital expenditure (cash) | 44.5 | 79.6 | 58.7 | 79.9 | 69.8 |
Free cash flow | 64.1 | -95.9 | 58.3 | 26.3 | 44.7 |
Dividends paid | 19.7 | 28.6 | 25.4 | 30.2 | 31.7 |
Share buybacks | 0.0 | 0.0 | 0.0 | 0.0 | 25.0 |
Depreciation and amortization | 40.7 | 43.1 | 44.5 | 47.5 | 48.1 |
Returns & Leverage Ratios (%) and Financial Ratios (x)
| Ratio | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
ROE on year-end net assets (%) | 14.2 | 6.3 | 6.7 | 6.4 | 4.5 |
ROA on year-end total assets (%) | 9.9 | 4.2 | 4.4 | 4.4 | 3.0 |
Current ratio (x) | 2.38 | 2.10 | 2.10 | 2.26 | 2.25 |
Total debt / net assets (x) | 0.12 | 0.22 | 0.21 | 0.20 | 0.25 |
Net debt / EBITDA (x) | -0.38 | 0.48 | 0.21 | 0.26 | 0.34 |
Asset turnover (x) | 0.84 | 0.89 | 0.78 | 0.80 | 0.72 |
Dividend payout (%) | 23.6 | 50.6 | 47.2 | 54.9 | 75.5 |
Region Overview
| Region | Tosoh Quartz assets | Demand anchor | Recent direction |
|---|---|---|---|
Japan | Yamagata, Yonezawa, Sakata plants; Tokyo, Tohoku and Hokuriku sales offices | Japanese equipment makers; display photomask makers; Hokuriku and Tohoku fab clusters | Display shipments recovered in FY2026 after the equipment accident was resolved; Yamagata capacity expansion under way since 2024 |
Taiwan | Tainan plant (expanded 2019, 2020, 2025); Hsinchu sales office | Taiwanese foundry ecosystem, including the Tainan Science Park leading-edge cluster | Repeated expansions point to sustained foundry demand; Taiwan produces more than 20% of the world's chips (Tosoh, 2019) |
South Korea | Ochang (Cheongju) plant since 2021; Seoul sales office | Korean equipment makers and memory fabs, which previously imported quartzware | Memory capex recovery in 2026 is a tailwind |
United States / Europe | Tosoh Quartz, Inc. in Portland, Oregon and Durham, UK (sister company) | US OEM and fab base | Tosoh reported lower overseas semiconductor shipments in FY2026; Tosoh SMD's US semiconductor shipments were weak enough to trigger an impairment |
Share Price History
| Date | Share price (JPY) | Context |
|---|---|---|
Oct 2025 | 2,205 | After Tosoh SMD impairment notice; 1-year total shareholder return reported at 20.8% |
17 Feb 2026 | 2,605 | Market cap about ¥806 bn |
24 Jul 2026 | 2,816 | Ahead of Q1 FY2027 results |
Valuation Snapshot
| Multiple | Value |
|---|---|
P/E, FY2026 actual EPS ¥132.40 | 21.3x |
P/E, FY2027 guided EPS ¥191.63 | 14.7x |
P/B, BPS ¥2,701.46 | 1.04x |
EV/EBITDA, FY2026 | 7.1x |
EV/Sales, FY2026 | 1.0x |
Dividend per share (JPY)
| Dividend per share (JPY) | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
Annual dividend | 80 | 80 | 85 | 100 | 100 |
Analyst Conclusions
Management guidance. Tosoh's FY2027 guidance (revised early November 2026):
Net sales: Guidance: ¥1.2 trillion (FY2026: ¥1,019.9 bn)
Operating income: Guidance: ¥109 bn (FY2026: ¥95.5 bn)
Ordinary income: Guidance: ¥107 bn
Net income: Guidance: ¥59 bn
Dividend: Guidance: ¥100
Management attributes the upgrade partly to higher high-performance-materials volumes and recovering semiconductor demand. For the quartz business specifically, it is focused on filling capacity added ahead of demand by winning new customers and raising productivity.
Net sales: FY2026 actual: 1019.9; FY2027 initial (Aug 2026): 1170.0; FY2027 revised (Nov 2026): 1200.0
Operating income: FY2026 actual: 95.5; FY2027 initial (Aug 2026): 105.0; FY2027 revised (Nov 2026): 109.0
Bull case.
-
Operating leverage on pre-built capacity. Yamagata, Yonezawa and Tainan capacity was added in 2022–2025, before demand. A semiconductor recovery, already visible in Advanced Materials' 14% Q1 FY2027 sales growth, should flow through with high incremental margins from a 4% base.
-
Leading-edge exposure in Taiwan and Korea. Tainan sits inside TSMC's 2 nm build-out, and Ochang serves Korean memory makers. Peers show the cycle at work: Wonik QnC's quartz division and Feilihua (+44% in H1 2026) are both growing on the same customers.
-
Integration and IP moat. Owning reference-grade N/NP/OP/S materials and holding plasma-durable glass patents lets Tosoh capture margin across melt and fabrication. Long qualification cycles protect incumbents.
Bear case.
-
Margins stay thin. Advanced Materials earned only ¥5.3 bn on ¥127.2 bn of sales in FY2025. The Tosoh SMD impairment shows the portfolio can destroy value when US demand disappoints.
-
Chinese substitution. State-backed Chinese competitors with much higher valuations, such as Feilihua at about 20x sales, can fund capacity aggressively and squeeze prices in mature-node and solar quartz.
-
Parent priorities. Quartz is about 1.3% of Tosoh's revenue. Volatility in petrochemicals and chlor-alkali, made worse by the Middle East disruption in 2026, competes for capital and management attention.
Key catalysts and monitorables (next 12 months).
Feb 2027: Catalyst / monitorable: Q3 FY2027 results: sales and profit trend in the High-Performance Materials segment
May 2027: Catalyst / monitorable: FY2027 results: first full year of High-Performance Materials reporting; FY2028 guidance
2027: Catalyst / monitorable: Completion and ramp of the Yamagata Plant capacity expansion
2027: Catalyst / monitorable: Utilization of the 2025 Tainan expansion as TSMC 2 nm fabs ramp
2027: Catalyst / monitorable: Korean memory capex and HBM build-outs affecting Ochang
Mid-2027: Catalyst / monitorable: Tosoh medium-term plan progress update, including capex and the 50% total return ratio
Ongoing: Catalyst / monitorable: Recovery of US semiconductor demand, a read-across from Tosoh SMD
Ongoing: Catalyst / monitorable: Competitor capacity additions: Wonik QnC, Techno Quartz, Feilihua
Analyst verdict. Tosoh Quartz Corporation is a high-quality franchise that is under-reported. It is Japan's oldest quartz glass maker, the fabrication centre of a group that controls quartz from silica melt to finished part, and part of a global quartz business that a Tosoh official put at 20–30% of world processing. Strategically it is well placed. It has plants and sales offices inside the Taiwanese and Korean fab clusters, reference materials from Tosoh SGM, and a parent with a 59% equity ratio and net debt of only a third of a year's EBITDA. That parent was willing to build quartz capacity in Yamagata, Yonezawa and Tainan before demand arrived.
Financial evidence of that positioning is still thin. The Advanced Materials portfolio that contains quartz grew just 1.3% in FY2026, and its last reported operating margin was about 4%. In FY2026 management acknowledged that semiconductor inventory corrections had left new capacity underused, and a sister thin-film business needed a ¥19.1 billion write-down. The thesis therefore depends on utilization. The November 2026 guidance upgrade, which explicitly cites higher volumes of high-performance materials and recovering semiconductor demand, is the first concrete sign that the upturn is arriving. Q1 FY2027 Advanced Materials sales were already up 14%.
On balance the risk/reward for the quartz franchise is positive into 2027. A sustained AI-driven logic and memory capex cycle should lift volumes through mostly fixed-cost plants, and replacement demand gives a floor. The main risks are aggressive Chinese pricing, a US demand slowdown that drags on group sentiment, and the fact that quartz is too small within Tosoh to move the parent's valuation on its own. For supply-chain analysts, Tosoh Quartz should be treated as a tier-one, strategically secure supplier. For equity investors, it is an embedded growth option within a Tosoh share price trading at about 1.0x book and about 15x guided earnings. The key variables to track are quartz utilization and the disclosed margins of the new High-Performance Materials segment.
Unlock Company Financials
Unlock this company profile to view its financial data.
View Subscription PlansExecutive Leadership
Executive Leadership Team
| Name | Title | Remit |
|---|---|---|
Hideki Ono | Representative Director, President and CEO | Overall management |
Hideaki Segawa | Director and Executive Officer | Head of Production Division |
Yuichi Hirakawa | Director and Executive Officer | Head of Environment, Safety & Quality Assurance Division |
Tomoyuki Akiyama | Director | Non-executive |
Hideyuki Itose | Director | Non-executive |
Ryoji Yoshimura | Director | Non-executive |
Hiroshi Saito | Audit & Supervisory Board Member | Statutory audit |
Yoshikazu Kikuchi | Executive Officer | Deputy Head of Production Division |
Takashi Abiko | Executive Officer | — |
Koichi Kawaguchi | Executive Officer | Head of Administration Division |
Masayuki Takahashi | Executive Officer | Head of Sales Division |
Executive Leadership Team by Person
| Person | Role | Background |
|---|---|---|
Robert Blanding | President, Tosoh Quartz, Inc. (since 1 Jan 2023) | CFO of TQI from 2019; earlier HP Inc. (3 years), ESCO Corporation (3 years) and Intel (18 years); BA, University of Washington; MBA, Indiana University |
Roger E. Wood | Former CEO and President, TQI (President until 1 Jan 2023, CEO until retirement on 7 Jul 2023) | Joined Weiss in 1978 as its sixth employee; more than 45 years in the business |
Mamoru Kuwata (桒田 守) | Representative Director, President and CEO, Tosoh Corporation | Parent CEO |
Toru Adachi | Former Representative Director and Senior Executive Vice President, Tosoh Corporation | Retirement announced 13 May 2026 |
Major Shareholders
| Holder | Stake (%) |
|---|---|
Tosoh Corporation | 100.0 |
Competitive Landscape
Key Competitors
| Competitor | Home | Main overlap | Latest revenue |
|---|---|---|---|
Heraeus Conamic (Heraeus Group) | Germany | Fused and synthetic quartz materials and fabricated parts | Not publicly disclosed at business-unit level |
Shin-Etsu Quartz Products (Shin-Etsu Chemical) | Japan | Quartz materials and fabricated quartzware | Not publicly disclosed at business-unit level |
Wonik QnC (incl. former Momentive quartz business) | South Korea | Semiconductor quartzware, ceramics, cleaning | KRW 943.6 bn (FY2025) |
Hubei Feilihua Quartz Glass | China | Semiconductor and optical quartz glass and fibre | CNY 2.02 bn (FY2025) |
Jiangsu Pacific Quartz | China | High-purity quartz sand, tubes, semiconductor quartz | CNY 0.75 bn (9M 2025) |
Ferrotec (incl. Hangzhou Dahe Thermo-Magnetics) | Japan / China | Fabricated quartz parts for equipment | Not publicly disclosed at quartz level |
Techno Quartz | Japan (Yamagata) | Quartz chamber parts; building plants in Yamagata, Fukushima and Vietnam | — |
QSIL | Germany | Quartz materials and fabrication | — |
AGC | Japan | Synthetic fused silica, photomask blanks | Not publicly disclosed at quartz level |
Corning | United States | HPFS synthetic fused silica | Not publicly disclosed at quartz level |
CoorsTek | United States | Quartz and ceramics for semiconductor equipment | Private |
“—” = not publicly disclosed.
Peer Comparison FY2025
| Company | Revenue, latest FY (local) | YoY growth (%) | Profitability |
|---|---|---|---|
Tosoh Advanced Materials portfolio (FY2026) | ¥128.9 bn | 1.3 | Operating margin 4.2% (FY2025) |
Wonik QnC (FY2025) | KRW 943.6 bn | 5.8 | Operating margin 6.3% |
Hubei Feilihua (FY2025) | CNY 2.02 bn | 15.8 | Net margin 18.0% (FY2024) |
Tosoh Quartz Corporation (latest disclosed) | ¥12.9 bn | — | — |
“—” = not publicly disclosed.
