Six requested companies; five are covered by one primary filing each — annual or half-year reports filed 2023–2026 on Chinese exchange disclosure hosts or faithful full-filing reproductions on financial portals — and one (Koh Young) could not be matched to an extractable primary filing in this review. Shares are percentages of each filing’s own cost denominator (operating cost, total cost, or main-business cost excluding freight), of annual sales, or of annual purchases, exactly as filed. “Kehua” here is Kehua Holdings Co., Ltd. (603161, turbocharger castings) — say so if a different Kehua was intended.
| Company | Named top buyers / customers | Named suppliers | Input-type cost breakdown | Inputs ≥60% |
|---|---|---|---|---|
| Broadex Technologies 博创科技 300548 static.cninfo.com.cn |
Top five anonymised except one: First 27.18%, Second 24.19%, Third 4.29%, YOFC consolidated (named) 3.09%, Fifth 2.86%; top five 61.61% of annual sales.2024 Annual Report, 2025-03-28 | First 20.27% (anonymised), YOFC consolidated (named) 11.63%, Third 8.23%, Fourth 5.75%, Fifth 2.54%; top five 48.42% of annual purchases.2024 Annual Report, 2025-03-28 | Direct materials 74.24% of operating cost (营业成本), directly stated.2024 Annual Report, 2025-03-28 | Yes |
| Innuovo Technology 英洛华 000795 money.finance.sina.com.cn |
All anonymised, shares stated: ranks 1–5 at 5.95%, 3.54%, 3.54%, 3.43%, 3.30%; top five 19.76% of annual sales.2025 Annual Report, approved 2026-03-19 (a publication copy is dated 2026-03-20) | All anonymised, shares stated: 10.24%, 6.17%, 6.15%, 4.62%, 4.42%; top five 31.60% of annual purchases.2025 Annual Report, 2026-03-19 | Material cost share of operating cost by product line: NdFeB 83.38%, motor series 82.45%, wheelchairs & mobility scooters 76.30%, audio speakers 79.78%. Product-level denominators; not a companywide figure and not additive.2025 Annual Report, 2026-03-19 | Yesevery disclosed product denominator |
| Jinhong Gas 金宏气体 688106 static.cninfo.com.cn |
Named, no individual shares and not a ranked top-five list: SMIC, SK hynix, GTA Semiconductor, United Nova Technology, China Resources Microelectronics, NAURA Integrated Circuit, SPIL, Huatian Technology, BOE, Tianma Microelectronics, Xiamen Tianma, TCL CSOT, Focus Lightings, Changelight, HC SemiTek, Aoyang Shunchang, Hengtong Group, Sumitomo Electric, Tongwei, Trina Solar, LONGi.2025 Half-Year Report, 2025-08-22 | State Grid named (electricity/raw material for air-separation products), no purchase share; other suppliers described only by category, not named.2025 Half-Year Report, 2025-08-22 | Direct materials ≈61% of main-business cost excluding freight (filing’s own approximation). Caveat: the later 2026 Half-Year Report, 2026-08-25, puts it at about 52%.2025 Half-Year Report, 2025-08-22 | Yes≈61% as filed |
| Kehua Holdings 科华控股 603161 (interpretation of “Kehua”; not Kehua Data or Kehua Bio — correct us if another Kehua was intended) stockn.xueqiu.com |
Five leading customers named — BorgWarner, Garrett, Ningbo Fengwo, Great Wall Motor, GKN and controlled entities — but only the combined top-five share is disclosed: 90.39% of annual sales; no individual share may be assigned.2022 Annual Report, 2023-04-24 | Filing checked, no supplier names disclosed; top five combined 51.42% of annual purchases.2022 Annual Report, 2023-04-24 | Direct materials 49.35% and outsourced processing 5.47% of total cost (manufacturing); directly disclosed categories sum to 54.82% (same denominator, so addable).2022 Annual Report, 2023-04-24 | No54.82% |
| Jianghai 江海股份 002484 pdf.dfcfw.com |
All anonymised, shares stated: A 7.43%, B 4.99%, C 2.85%, D 2.74%, E 2.63%; top five 20.64% of annual sales. (The 2010 IPO prospectus, 2010-08-12, names customers such as Samsung and Siemens but gives no shares — historical note only.)2023 Annual Report, 2024-04-11 | All anonymised, shares stated: A 10.96%, B 6.92%, C 5.38%, D 3.70%, E 3.61%; top five 30.57% of annual purchases.2023 Annual Report, 2024-04-11 | Direct materials 85.85% of electronic-components operating cost and 58.01% of electronic-materials operating cost — separate denominators, not additive, no companywide figure stated.2023 Annual Report, 2024-04-11 | Mixedyes components, no materials |
| Koh Young Technology 고영테크놀러지 098460 |
Unresolved — no primary filing successfully retrieved in this review. | Unresolved — no primary filing successfully retrieved in this review. | Unresolved — no primary filing successfully retrieved in this review. Incomplete coverage, not a non-disclosure finding; filing and date left blank rather than guessed. | Unresolved |
Anonymised labels (First, 第1名, A–E, 客户一) are preserved exactly as filed; no identity is inferred for any of them. Facts are filing-specific, not timeless: each cell states its own filing and date, and newer filings can and do change the numbers (Jinhong’s materials share, for example). Sources mix exchange/company filing hosts and independent full-filing mirrors reproducing primary filings.
Method: built from 26 evidence rows extracted from primary filings (annual reports, half-year reports, prospectuses) for six companies, retrieved for this review; the main table keeps one preferred filing per company — the newest filing covering buyers, suppliers and input costs together — and drops older or partial filings for space. Input-cost shares count only materials, components and outsourced processing against the filing’s stated cost denominator; labor, overhead, energy and mix breakdowns are excluded. Percentages are quoted as filed, unrounded. Koh Young carries no numbers because no primary filing was retrieved.