# Who are Hoya Corporation's customers? Who does Hoya Corporation earn revenue from?
Canonical: https://valuechain.wiki/hoya · Facet: customers · Updated: 2026-07-12T03:18:30.705+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Hoya Corporation's confirmed revenue counterparties include Toppan (Tekscend Photomask), Western Digital, Photronics plus 2 undisclosed/aggregate relationships. Per the valuechain.wiki graph: 5 revenue edges, backed by 8 dated sources, 1 of them primary filings (as of 2026-07-12).

### 토판 (Toppan/Tekscend Photomask) (mid)  → /toppan-printing.md
- note: Toppan (Tekscend) is a top-tier merchant photomask maker, yet it cannot make a single EUV mask from its own blanks — near-zero-defect blanks come only from the Hoya/AGC duopoly (Hoya EUV 75%+). Hoya thus sits one step further upstream than Toppan as 'the supplier to the mask makers,' owning the true bottleneck where margin accrues as leading-edge mask demand rises.
- [mentions] MarketScreener (EN, research, published 2026-06-12) https://www.marketscreener.com/quote/stock/HOYA-CORPORATION-6491345/consensus/: "13-analyst consensus 'Buy'; avg 12-month target ~JPY 29,594 (high 34,000, low 25,000)."
- [confirms] HOYA Corporation (EN, filing, published 2026-04-30) https://ssl4.eir-parts.net/doc/7741/tdnet/2797234/00.pdf: "IT segment revenue JPY 354.8bn (+14.0%), pretax profit JPY 192.3bn (54% margin). Mask blanks, HDD glass substrates and imaging drove growth."
- [mentions] ETNews (KO, news, published 2026-01-12) https://www.etnews.com/20260112000180: "EUV blank masks ~90% dominated by Hoya/AGC; Hoya ~70% global share. Samsung pushing domestic (S&S Tech)."
- [mentions] Semiconductor Insight (EN, analysis, published 2025-08-01) https://semiconductorinsight.com/blog/hoya-expands-euv-photomask-blank-capabilities-strengthening-global-semiconductor-supply-chain/: "Hoya supplies critical materials (blanks) to mask makers; EUV blanks effectively monopolized by Hoya and AGC."
- [confirms] HOYA (JA, ir, published 2025-08-01) https://www.hoya.com/ir/2025/ja/highlight/: "Semiconductor mask blanks saw surging EUV-driven demand; IT segment revenue +36%."
- [mentions] SemiconductorX (EN, analysis, published 2024-06-01) https://semiconductorx.com/semiconductor-euv-mask-blanks.html: "HOYA above 60% in mask blanks overall, above 75% in EUV."

### 웨스턴디지털 (mid)  → /western-digital.md
- note: To push nearline HDD capacity past 32TB, WD must move to HAMR, and HAMR's 400-450C deposition is too hot for aluminum — glass substrates become mandatory, and Hoya effectively supplies that glass (100% of 2.5"). WD's capacity roadmap therefore is itself a structural demand that lifts Hoya content per drive — not a one-off but a multi-year volume-and-content tailwind tied to data-center storage growth.
- [confirms] HOYA Corporation (EN, filing, published 2026-04-30) https://ssl4.eir-parts.net/doc/7741/tdnet/2797234/00.pdf: "HDD substrate sales rose sharply, led by 3.5-inch; IT segment revenue JPY 354.8bn (+14.0%)."
- [mentions] Tom's Hardware (EN, news, published 2025-05-15) https://www.tomshardware.com/news/hoya-hdd-22tb-24tb: "Hoya is the largest HDD glass-substrate maker; described substrates for 22TB/24TB high-capacity drives."
- [mentions] Semiconductor Insight (EN, analysis, published 2025-03-01) https://semiconductorinsight.com/report/glass-substrate-for-hard-disk-drives-market/: "HOYA: 100% of 2.5-inch HDD glass substrates; largest maker overall."

### 포트로닉스 (mid)  → /photronics.md
- note: Photronics is the largest independent merchant mask maker but depends on external blanks, so every mask it ships to fabless and smaller foundries without captive mask shops flows directly into upstream Hoya blank demand. For Hoya, the more its customers' customers diversify, the more entrenched its bottleneck position becomes.
- [confirms] HOYA Corporation (EN, filing, published 2026-04-30) https://ssl4.eir-parts.net/doc/7741/tdnet/2797234/00.pdf: "IT segment revenue JPY 354.8bn (+14.0%), pretax profit JPY 192.3bn (54% margin). Mask blanks, HDD glass substrates and imaging drove growth."
- [mentions] Semiconductor Insight (EN, analysis, published 2025-08-01) https://semiconductorinsight.com/blog/hoya-expands-euv-photomask-blank-capabilities-strengthening-global-semiconductor-supply-chain/: "Hoya supplies blanks to mask makers; Photronics, Toppan, DNP are the top-tier photomask trio."

### 다이니폰인쇄 (DNP) (mid)  → /dai-nippon-printing.md
- note: DNP, which with Toppan anchors the global photomask market, likewise depends on Hoya/AGC for blanks — the essence of Hoya's oligopoly is that however fiercely the mask trio (Toppan, DNP, Photronics) compete downstream, upstream they are all Hoya's customers.
- [mentions] ETNews (KO, news, published 2026-01-12) https://www.etnews.com/20260112000180: "Blank-mask market monopolized by Hoya/AGC."
- [mentions] Semiconductor Insight (EN, analysis, published 2025-08-01) https://semiconductorinsight.com/blog/hoya-expands-euv-photomask-blank-capabilities-strengthening-global-semiconductor-supply-chain/: "Toppan and DNP hold ~30% of the global photomask market; blanks rely on Hoya/AGC."

### 씨게이트 (mid)  → /seagate.md
- note: Seagate's Mozaic (HAMR) platform cannot exist without glass substrates, and because Seagate long leaned on aluminum and in-house sourcing, its HAMR shift means fresh demand flowing to Hoya glass. With both major HDD makers converting to glass at once, Hoya's HDD line stands at the start of a transition, not at a cyclical trough.
- [confirms] HOYA Corporation (EN, filing, published 2026-04-30) https://ssl4.eir-parts.net/doc/7741/tdnet/2797234/00.pdf: "HDD glass-substrate sales rose sharply, led by 3.5-inch."
- [mentions] Tom's Hardware (EN, news, published 2025-05-15) https://www.tomshardware.com/news/hoya-hdd-22tb-24tb: "HAMR media require glass substrates — Seagate's Mozaic uses glass; Hoya is the largest supplier."

Reverse side: https://valuechain.wiki/hoya/suppliers.md · Ripple: https://valuechain.wiki/hoya/ripple.md

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Full node: https://valuechain.wiki/hoya.md · JSON: https://valuechain.wiki/hoya.json