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CO.,LTD.","holder_sec_code":"7021","doc_id":"S100Y8BD","period_end":"2026-03-31","holder_table":"reporting","shares":12343,"book_value_yen":72983000,"prior_shares":11605,"prior_book_value_yen":40467000,"purpose_ja":"資源関連事業においてハイシリカの販売取引を行っており、取引関係、協力関係等の維持・強化等を目的として政策的に保有しております。また、当社は日本電気硝子㈱の取引先持株会を通じて同社株式を継続的に取得しているため、株式数が増加しています。","reciprocal":"無","pct_outstanding":0.016407379207832112,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.5959741956557243,"pct_of_holder_assets":0.4245419114653016,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":12246000000,"holder_total_assets_yen":17191000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社ジェイエスピー","holder_name_en":"ＪＳＰ Corporation","holder_sec_code":"7942","doc_id":"S100YEL0","period_end":"2026-03-31","holder_table":"reporting","shares":9124,"book_value_yen":53000000,"prior_shares":8607,"prior_book_value_yen":30000000,"purpose_ja":"保有目的は取引関係の維持・強化であります。定量的な保有効果の詳細は、営業上の機密に関係することもあり記載は困難ですが、定性面・定量面の保有効果について取締役会において検証いたしました。株式の増加は持株会を通じた定期取得によります。","reciprocal":"無","pct_outstanding":0.012128407023597196,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.04669027608929295,"pct_of_holder_assets":0.03215082985538193,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":113514000000,"holder_total_assets_yen":164848000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社朝日工業社","holder_name_en":"ASAHI KOGYOSHA CO., LTD.","holder_sec_code":"1975","doc_id":"S100YIGB","period_end":"2026-03-31","holder_table":"reporting","shares":9124,"book_value_yen":53000000,"prior_shares":8607,"prior_book_value_yen":30000000,"purpose_ja":"工事受注を主とした取引関係の維持発展等、中長期的な企業価値の向上を実現するため。持株会への拠出により517株増加しております。","reciprocal":"無","pct_outstanding":0.012128407023597196,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.10421172676864997,"pct_of_holder_assets":0.05263314696564942,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":50858000000,"holder_total_assets_yen":100697000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"中外炉工業株式会社","holder_name_en":"Chugai Ro Co., Ltd.","holder_sec_code":"1964","doc_id":"S100YBFQ","period_end":"2026-03-31","holder_table":"reporting","shares":7903,"book_value_yen":46000000,"prior_shares":7420,"prior_book_value_yen":25000000,"purpose_ja":"顧客であり、営業上の取引関係の維持・強化を図るため保有しており、持株会における買増により増加いたしました。","reciprocal":"無","pct_outstanding":0.0105053486088874,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.14611988183348687,"pct_of_holder_assets":0.0897000897000897,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":31481000000,"holder_total_assets_yen":51282000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社日新","holder_name_en":"NISSIN CORPORATION","holder_sec_code":"9066","doc_id":"S100W2WJ","period_end":"2025-03-31","holder_table":"reporting","shares":null,"book_value_yen":27000000,"prior_shares":null,"prior_book_value_yen":30000000,"purpose_ja":"当社物流事業における関係維持・強化、取引拡大等の観点から保有しております。定量的な保有効果の記載は困難ですが、便益や資本効率等を精査し、保有の合理性について取締役会において報告を行っております。","reciprocal":"無","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2024-12-31","pct_share_classes":1,"pct_of_holder_equity":0.0294653672803466,"pct_of_holder_assets":0.016281832490095217,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":91633000000,"holder_total_assets_yen":165829000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"美濃窯業株式会社","holder_name_en":"MINO CERAMIC CO.,LTD.","holder_sec_code":"5356","doc_id":"S100YG4G","period_end":"2026-03-31","holder_table":"reporting","shares":4555,"book_value_yen":26939000,"prior_shares":4297,"prior_book_value_yen":14985000,"purpose_ja":"同社は当社の耐火物セラミックス事業における耐火物等の販売先であり、受注機会拡大を図ることを目的として保有しております。持株会による定期的取得により増加しております。","reciprocal":"無","pct_outstanding":0.006054898508602064,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.17080876386739346,"pct_of_holder_assets":0.12089611129102093,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":15771439000,"holder_total_assets_yen":22282768000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"三京化成株式会社","holder_name_en":"SANKYO KASEI CORPORATION","holder_sec_code":"8138","doc_id":"S100YIC4","period_end":"2026-03-31","holder_table":"reporting","shares":4106,"book_value_yen":24283000,"prior_shares":3861,"prior_book_value_yen":13464000,"purpose_ja":"(保有目的) 取引関係の安定確保(業務提携等の概要) 商品の販売 (定量的な保有効果) (注) ２(株式数が増加した理由) 取引先持株会を通じた株式の取得 ","reciprocal":"無","pct_outstanding":0.005458049017852924,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.2641204022705022,"pct_of_holder_assets":0.15735645815969346,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":9193913000,"holder_total_assets_yen":15431842000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社　高田工業所","holder_name_en":"TAKADA CORPORATION","holder_sec_code":"1966","doc_id":"S100YGU2","period_end":"2026-03-31","holder_table":"reporting","shares":4106,"book_value_yen":24283000,"prior_shares":3861,"prior_book_value_yen":13464000,"purpose_ja":"営業関係強化のため入会している取引先持株会を通じた株式の取得により保有株式数が増加しております。定量的な保有効果については記載が困難なため保有の合理性を検証した方法を欄外に注記しております。","reciprocal":"無","pct_outstanding":0.005458049017852924,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.11024670554940501,"pct_of_holder_assets":0.05088962431750733,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":22026055000,"holder_total_assets_yen":47716996000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"旭ダイヤモンド工業株式会社","holder_name_en":"Asahi Diamond Industrial Co., Ltd.","holder_sec_code":"6140","doc_id":"S100YJMM","period_end":"2026-03-31","holder_table":"reporting","shares":3976,"book_value_yen":23000000,"prior_shares":3607,"prior_book_value_yen":12000000,"purpose_ja":"電子・半導体用硝子業界の当社グループの顧客であり、同社との事業上の関係強化・維持のため株式を保有しています。なお、持株会による株式取得により株式数が増加しております。","reciprocal":"無","pct_outstanding":0.0052852418156315705,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.035862972260770586,"pct_of_holder_assets":0.029039304066765147,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":64133000000,"holder_total_assets_yen":79203000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"エア・ウォーター株式会社","holder_name_en":"AIR WATER INC.","holder_sec_code":"4088","doc_id":"S100YZGY","period_end":"2026-03-31","holder_table":"reporting","shares":null,"book_value_yen":null,"prior_shares":217226,"prior_book_value_yen":757000000,"purpose_ja":"当事業年度において株式の売却を実施しております。","reciprocal":"無","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":null,"pct_of_holder_assets":null,"holder_equity_basis":"ifrs_consolidated_excl_nci","holder_equity_yen":390229000000,"holder_total_assets_yen":1216287000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社しずおかフィナンシャルグループ","holder_name_en":"Shizuoka Financial Group, Inc.","holder_sec_code":"5831","doc_id":"S100Y9RT","period_end":"2026-03-31","holder_table":"largest","shares":null,"book_value_yen":null,"prior_shares":506436,"prior_book_value_yen":1765000000,"purpose_ja":"－","reciprocal":"－","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":null,"pct_of_holder_assets":null,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":1231900000000,"holder_total_assets_yen":16016015000000,"implausible":false,"reciprocal_held_both_ways":null},{"holder_name":"株式会社アウトソーシング","holder_name_en":"OUTSOURCING Inc.","holder_sec_code":"2427","doc_id":"S100T6OJ","period_end":"2023-12-31","holder_table":"reporting","shares":null,"book_value_yen":null,"prior_shares":710,"prior_book_value_yen":1000000,"purpose_ja":"定量的な記載は困難でありますが、前事業年度末において企業間取引関係の維持・強化のため、保有しております。","reciprocal":"無","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2023-12-31","pct_share_classes":1,"pct_of_holder_equity":null,"pct_of_holder_assets":null,"holder_equity_basis":"ifrs_consolidated_excl_nci","holder_equity_yen":89775000000,"holder_total_assets_yen":423794000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"住友商事株式会社","holder_name_en":"SUMITOMO CORPORATION","holder_sec_code":"8053","doc_id":"S100YARD","period_end":"2026-03-31","holder_table":"reporting","shares":null,"book_value_yen":null,"prior_shares":50400,"prior_book_value_yen":176000000,"purpose_ja":"主に都市総合開発グループの同社との取引関係の維持・強化による中長期的な収益の拡大等を目的として保有しております。当社グループは同社と工場用設備等の取引を行っております。","reciprocal":"有","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":null,"pct_of_holder_assets":null,"holder_equity_basis":"ifrs_consolidated_excl_nci","holder_equity_yen":4628555000000,"holder_total_assets_yen":13638338000000,"implausible":false,"reciprocal_held_both_ways":true}],"reclassified":[],"reclassified_note":"As filed, from the annual report's 保有目的を変更した投資株式 table. direction=to_pure means the filer moved the holding from a policy shareholding to 純投資目的 (pure investment); the shares are not necessarily sold, and the position leaves the named policy table in the year of the change. direction=to_policy is the reverse. fy_of_change_ja is the fiscal year the filer states the change took effect, verbatim — some filers list more than one. A filing repeats these rows for several years after the change, so this is a standing disclosure, not a one-year event.","implausible_note":"A row is flagged implausible when its two filed numbers are mutually impossible — book value ÷ shares of ¥1,000,000 or more, which no listed Japanese share reaches. It is a filer tagging error (a value entered at the wrong scale, or a share count in thousands), not an extraction error: the values match the filing's XBRL exactly. Flagged rows are still returned, exactly as filed, but are excluded from the yen aggregates here and counted in excluded_positions / excluded_yen so the exclusion is visible.","notes":[{"holder_table":"reporting","note_no":"1","text_ja":"（注）１.「－」は、当該銘柄を保有していないことを示しています。"},{"holder_table":"reporting","note_no":"2","text_ja":"２.定量的な保有効果については記載が困難です。当社は、業務提携及び取引の維持・強化等、保有目的の合理性が認められる場合を除いて、原則として特定投資株式を保有しないという方針のもと、保有の合理性は、毎年、取締役会において、個別の銘柄毎に保有目的や経済合理性等を総合的に勘案し、検証しています。検証の結果、所期の保有目的が希薄化してきた特定投資株式については売却を進めており、提出日現在（2026年３月26日）に保有する特定投資株式については、縮減を進めている銘柄を除きいずれも保有方針に沿った目的で保有していることを確認しています。なお、直近では、2026年１月30日開催の取締役会で検証を行っております。"},{"holder_table":"reporting","note_no":"3","text_ja":"３.当社の株式の保有の有無については、銘柄が持株会社の場合はその主要な子会社の保有分（実質所有株式数）を勘案し記載しています。"}],"notes_note":"The filing's own numbered footnotes to the named policy table, verbatim. The XBRL numbers them (注)1, (注)2 … and gives no link back to a row, so a note is tied to a position only where it names that issuer.","flows":[{"holder_table":"reporting","share_class":"listed","issues_increased":null,"acquisition_cost_yen":null,"issues_decreased":3,"sale_proceeds_yen":6855000000,"entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","issues_increased":1,"acquisition_cost_yen":41000000,"issues_decreased":null,"sale_proceeds_yen":null,"entity_scope":"parent_only","share_scope":"unlisted"}],"flows_note":"The filer's own tally, as filed, of how many issues increased or decreased during the year and the yen involved — acquisition cost for increases, sale proceeds for decreases. Read against the reclassification table this separates what was actually sold from what merely changed category. Counts are as filed and are not corrected for filer tagging errors.","no_reduction_measure":"This product holds sale proceeds (売却価額), as filed, for one fiscal year. It does NOT hold a book-value-reduction measure. The two are different measures and must never be presented as equivalent.","scale":{"policy_total_yen":36204000000,"listed_yen":35980000000,"unlisted_yen":224000000,"listed_issues":17,"unlisted_issues":2,"equity_yen":496181000000,"equity_basis":"jgaap_consolidated","total_assets_yen":701413000000,"assets_basis":"jgaap_consolidated","pct_of_equity":7.296530903037399,"pct_of_assets":5.161580980107297,"equity_basis_label":"Consolidated net assets (Japanese GAAP)","assets_basis_label":"Consolidated net assets (Japanese GAAP)","equity_calc":"total policy shareholdings ÷ shareholders' equity × 100, both as filed in this annual securities report","assets_calc":"total policy shareholdings ÷ total assets × 100, both as filed in this annual securities report"},"scale_entities":[{"holder_table":"reporting","share_class":"listed","book_value_yen":35980000000,"issue_count":17,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","book_value_yen":224000000,"issue_count":2,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"unlisted"}],"scale_history":[{"year":"2021","period_end":"2021-12-31","policy_total_yen":40518000000,"equity_yen":499742000000,"equity_basis":"jgaap_consolidated","pct_of_equity":8.107783616346035,"pct_of_assets":5.8037984383974885},{"year":"2022","period_end":"2022-12-31","policy_total_yen":35852000000,"equity_yen":528912000000,"equity_basis":"jgaap_consolidated","pct_of_equity":6.778443294914844,"pct_of_assets":4.7936441295508665},{"year":"2023","period_end":"2023-12-31","policy_total_yen":38095000000,"equity_yen":490130000000,"equity_basis":"jgaap_consolidated","pct_of_equity":7.772427723257095,"pct_of_assets":5.411859636860596},{"year":"2024","period_end":"2024-12-31","policy_total_yen":37477000000,"equity_yen":487559000000,"equity_basis":"jgaap_consolidated","pct_of_equity":7.686659460701167,"pct_of_assets":5.391109710959876},{"year":"2025","period_end":"2025-12-31","policy_total_yen":36204000000,"equity_yen":496181000000,"equity_basis":"jgaap_consolidated","pct_of_equity":7.296530903037399,"pct_of_assets":5.161580980107297}],"scale_note":"The policy total is Official (as filed) — the filing's own total carrying amount for the whole policy bucket, listed and unlisted, summed across the entities the filing discloses. It is a floor: holdings at group companies the filing does not name are disclosed nowhere and are not included. The percentages are calculated, not filed, and carry their formula. equity_basis names which figure the denominator is, because filers report under Japanese, IFRS or US accounting standards and an adopter of the latter two stops tagging the Japanese consolidated figure — a parent-only denominator is a different measure and is labelled as one, never silently mixed with a group figure. Percentages are null where equity or total assets is missing or not positive; missing is never shown as zero.","scale_reference":"ISS's Japan proxy voting guidelines recommend a vote against the top executive at a company that allocates 20 percent or more of its net assets to cross-shareholdings, a policy effective from February 2022. ISS counts unilateral holdings, not only mutual ones.","ownership_calc":"shares held ÷ (issuer's issued shares − treasury shares) × 100, both as filed, the denominator taken from the issuer's own annual securities report nearest the holding's fiscal year end","ownership_note":"Derived, not filed. The denominator is the issuer's own reported issued shares less treasury shares, from its annual report nearest this holding's fiscal year end on either side — pct_basis_period_end gives that date, and it can fall after the holding's date where that report is the closer one. For a single-class listed stock this equals the stake's share of market capitalisation. It is null where the issuer files no annual report we hold; where the issuer's share count moves by half or more across the window, because a split or issue makes the share base indeterminate; and where the result would exceed 100%, which is a data fault rather than a stake. It is less exact where the issuer has more than one share class (pct_share_classes > 1), because treasury shares are reported across all classes.","holder_share_calc":"this position's book value ÷ the holder's shareholders' equity (or total assets) × 100, both as filed in the holder's own annual securities report","holder_share_note":"The mirror of pct_outstanding. That sizes a stake against the ISSUER — how much of the issuer this holder owns. pct_of_holder_equity and pct_of_holder_assets size the same position against the HOLDER: how much of its own capital is committed to this one name. Calculated, not filed. Null where the holder's filing gives no usable denominator, never zero. holder_equity_basis says which accounting figure the denominator is, and a parent_only basis is not comparable with a consolidated one. A position CAN legitimately exceed 100% of equity — a holder whose book equity is smaller than one long-held stake is a real and commercially interesting case, not an error — so no ceiling is imposed. Extreme values are worth checking against the filing: where the position's own two filed numbers are mutually impossible the row is marked `implausible`, but that test catches only scale errors visible per share, so it does not catch every bad figure. The book value and share count are returned alongside so the reader can check.","action_calc":"keyword match over the filing's own stated purpose and table footnotes: 株式分割、株式併合、株式交換、株式移転、会社分割、合併、持株会社、商号変更、公開買付、上場廃止","ratio_calc":"current shares ÷ prior shares where that ratio is an exact whole number (or its exact reciprocal) — the signature of a split or a consolidation rather than a trade","history":[{"year":"2021","period_end":"2021-12-31","named_holdings":31,"book_value_yen":40501000000},{"year":"2022","period_end":"2022-12-31","named_holdings":29,"book_value_yen":35838000000},{"year":"2023","period_end":"2023-12-31","named_holdings":26,"book_value_yen":38083000000},{"year":"2024","period_end":"2024-12-31","named_holdings":23,"book_value_yen":37285000000},{"year":"2025","period_end":"2025-12-31","named_holdings":19,"book_value_yen":35975000000}],"history_note":"One point per annual report filed. Each year's book value is as filed; book values are fair-valued at period end, so a change reflects both trading and market moves.","provenance":{"trust":"official","note":"Figures exactly as filed in each company's 有価証券報告書 (annual securities report), EDINET. Raw filings archived with SHA-256; doc_id links to the source filing."}}