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LIMITED","holder_sec_code":"5331","doc_id":"S100Y4PM","period_end":"2026-03-31","holder_table":"reporting","shares":434000,"book_value_yen":239000000,"prior_shares":434000,"prior_book_value_yen":210000000,"purpose_ja":"取引先との良好な関係の維持・強化のため保有しています。","reciprocal":"有","pct_outstanding":0.9767778933106469,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.14248411212724607,"pct_of_holder_assets":0.10387871833654966,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":167738000000,"holder_total_assets_yen":230076000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"株式会社ひろぎんホールディングス","holder_name_en":"Hirogin Holdings, Inc.","holder_sec_code":"7337","doc_id":"S100YCZN","period_end":"2026-03-31","holder_table":"largest","shares":423000,"book_value_yen":233000000,"prior_shares":423000,"prior_book_value_yen":205000000,"purpose_ja":"同社は、当社グループの主要営業地域に複数の営業拠点を有する各種耐火物製品製造・販売事業者であり、地域経済における産業・雇用創出に貢献していると認識しております。同社との各種取引（役職員との取引含む）における収益等及び当該株式の配当金額の合計と、株式保有に係る資本コストとの比較分析及び当該株式の配当金RORAと、保有する上場政策保有株式全体の配当金RORA（加重平均）との比較分析により、定量的な保有効果等を含め保有意義を確認しております。当社の主要営業地域の中核企業として認識しており、上記保有目的の通り、当社の企業価値向上に資するものとして保有しております。","reciprocal":"有","pct_outstanding":0.9520208499318056,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.040961703444299113,"pct_of_holder_assets":0.0019081798593008085,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":568824000000,"holder_total_assets_yen":12210589000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"東北特殊鋼株式会社","holder_name_en":"Tohoku Steel Co.,Ltd.","holder_sec_code":"5484","doc_id":"S100YNM9","period_end":"2026-03-31","holder_table":"reporting","shares":384100,"book_value_yen":212023000,"prior_shares":384100,"prior_book_value_yen":186288000,"purpose_ja":"高機能製品および材料開発を支える真空溶解炉で使用される耐火材等の副資材の調達先であり、継続取引関係の維持・強化および安定生産のため","reciprocal":"有","pct_outstanding":0.8644709419829941,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.7195638748478856,"pct_of_holder_assets":0.583065099774029,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":29465487000,"holder_total_assets_yen":36363521000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"サンメッセ株式会社","holder_name_en":"Sun Messe Co.,Ltd.","holder_sec_code":"7883","doc_id":"S100YFTU","period_end":"2026-03-31","holder_table":"reporting","shares":335000,"book_value_yen":184920000,"prior_shares":335000,"prior_book_value_yen":162475000,"purpose_ja":"印刷物等の重要な取引先であり、同社との良好な取引関係の維持・強化を図るため保有しています。","reciprocal":"有","pct_outstanding":0.7539645029010753,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":1.303343005737895,"pct_of_holder_assets":0.8188102481638871,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":14188130000,"holder_total_assets_yen":22583987000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"知多鋼業株式会社","holder_name_en":"CHITA KOGYO CO.,LTD.","holder_sec_code":"5993","doc_id":"S100THI8","period_end":"2024-02-29","holder_table":"reporting","shares":304000,"book_value_yen":143184000,"prior_shares":304000,"prior_book_value_yen":99712000,"purpose_ja":"（保有目的等）地域貢献及び事業戦略や有益な情報収集など中長期観点から当社グループの企業価値の向上を図る（定量的な保有効果）（注）１","reciprocal":"有","pct_outstanding":0.6858122588941278,"pct_unavailable":null,"pct_basis_period_end":"2024-03-31","pct_share_classes":1,"pct_of_holder_equity":0.6044369787573227,"pct_of_holder_assets":0.4850914436874132,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":23688822000,"holder_total_assets_yen":29516909000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"日本坩堝株式会社","holder_name_en":"Nippon Crucible Co., Ltd.","holder_sec_code":"5355","doc_id":"S100YINX","period_end":"2026-03-31","holder_table":"reporting","shares":1000,"book_value_yen":552000,"prior_shares":1000,"prior_book_value_yen":485000,"purpose_ja":"耐火物および耐火材料等を製造する同業として、最低単位の保有を継続しております。","reciprocal":"有","pct_outstanding":0.002250640307167389,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.00889788133708076,"pct_of_holder_assets":0.00456206264736826,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":6203724000,"holder_total_assets_yen":12099790000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"株式会社ＦＵＪＩ","holder_name_en":"FUJI CORPORATION","holder_sec_code":"6134","doc_id":"S100YKAW","period_end":"2026-03-31","holder_table":"reporting","shares":null,"book_value_yen":null,"prior_shares":415000,"prior_book_value_yen":201000000,"purpose_ja":"当事業年度において売却","reciprocal":"無","pct_outstanding":null,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":null,"pct_of_holder_assets":null,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":232454000000,"holder_total_assets_yen":278356000000,"implausible":false,"reciprocal_held_both_ways":false}],"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．定量的な保有効果は記載が困難であり、保有の合理性の検証については、a.保有方針及び保有の合理性を検証する方法並びに個別銘柄の保有の適否に関する取締役会等における検証の内容をご参照ください。"},{"holder_table":"reporting","note_no":"2","text_ja":"２．株式会社みずほフィナンシャルグループは当社株式を保有しておりませんが、同社子会社である株式会社みずほ銀行は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"3","text_ja":"３．株式会社あいちフィナンシャルグループは当社株式を保有しておりませんが、同社子会社である株式会社あいち銀行は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"4","text_ja":"４．株式会社十六フィナンシャルグループは当社株式を保有しておりませんが、同社子会社である株式会社十六銀行は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"5","text_ja":"５．株式会社山口フィナンシャルグループは当社株式を保有しておりませんが、同社子会社である株式会社山口銀行は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"6","text_ja":"６．ＪＦＥホールディングス株式会社は当社株式を保有しておりませんが、同社子会社であるＪＦＥスチール株式会社は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"7","text_ja":"７．株式会社名古屋銀行については、当事業年度に株式分割が行われたため株式数が増加しております。"},{"holder_table":"reporting","note_no":"8","text_ja":"８．日本製鉄株式会社については、当事業年度に株式分割が行われたため株式数が増加しております。"},{"holder_table":"reporting","note_no":"9","text_ja":"９．ＵＢＥ株式会社は当社株式を保有しておりませんが、同社子会社である宇部マテリアルズ株式会社は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"10","text_ja":"10.愛知製鋼株式会社については、当事業年度に株式分割が行われたため株式数が増加しております。"},{"holder_table":"reporting","note_no":"11","text_ja":"11.株式会社ひろぎんホールディングスは当社株式を保有しておりませんが、同社子会社である株式会社広島銀 行は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"12","text_ja":"12.株式会社ブリヂストンについては、当事業年度に株式分割が行われたため株式数が増加しております。"},{"holder_table":"reporting","note_no":"13","text_ja":"13.株式会社品川リフラクトリーズ株式会社は、2025年10月１日付で品川リフラ株式会社へ商号変更をしております。"},{"holder_table":"reporting","note_no":"14","text_ja":"14.株式会社コンコルディアフィナンシャルグループは、2025年10月１日付で株式会社横浜フィナンシャルグループへ商号変更をしております。"}],"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":6,"acquisition_cost_yen":659744000,"issues_decreased":5,"sale_proceeds_yen":1607105000,"entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","issues_increased":null,"acquisition_cost_yen":null,"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":16218385000,"listed_yen":16211900000,"unlisted_yen":6485000,"listed_issues":62,"unlisted_issues":8,"equity_yen":54015000000,"equity_basis":"jgaap_consolidated","total_assets_yen":66994000000,"assets_basis":"jgaap_consolidated","pct_of_equity":30.025705822456725,"pct_of_assets":24.208712720542138,"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":16211900000,"issue_count":62,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","book_value_yen":6485000,"issue_count":8,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"unlisted"}],"scale_history":[{"year":"2021","period_end":"2021-03-31","policy_total_yen":7084044000,"equity_yen":34970000000,"equity_basis":"jgaap_consolidated","pct_of_equity":20.257489276522733,"pct_of_assets":15.688630021703503},{"year":"2022","period_end":"2022-03-31","policy_total_yen":6917683000,"equity_yen":36827000000,"equity_basis":"jgaap_consolidated","pct_of_equity":18.78426969343145,"pct_of_assets":14.622649446182464},{"year":"2023","period_end":"2023-03-31","policy_total_yen":8359002000,"equity_yen":39806000000,"equity_basis":"jgaap_consolidated","pct_of_equity":20.999351856504045,"pct_of_assets":16.714661067786444},{"year":"2024","period_end":"2024-03-31","policy_total_yen":12578402000,"equity_yen":45165000000,"equity_basis":"jgaap_consolidated","pct_of_equity":27.849888187756004,"pct_of_assets":22.105766155252105},{"year":"2025","period_end":"2025-03-31","policy_total_yen":11624988000,"equity_yen":47371000000,"equity_basis":"jgaap_consolidated","pct_of_equity":24.5403052500475,"pct_of_assets":19.647092227348782},{"year":"2026","period_end":"2026-03-31","policy_total_yen":16218385000,"equity_yen":54015000000,"equity_basis":"jgaap_consolidated","pct_of_equity":30.025705822456725,"pct_of_assets":24.208712720542138}],"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":"2021-03-31","named_holdings":60,"book_value_yen":7074512000},{"year":"2022","period_end":"2022-03-31","named_holdings":60,"book_value_yen":6908207000},{"year":"2023","period_end":"2023-03-31","named_holdings":60,"book_value_yen":8350161000},{"year":"2024","period_end":"2024-03-31","named_holdings":60,"book_value_yen":12571284000},{"year":"2025","period_end":"2025-03-31","named_holdings":60,"book_value_yen":11618310000},{"year":"2026","period_end":"2026-03-31","named_holdings":60,"book_value_yen":16211859000}],"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."}}