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LTD.","holder_sec_code":"5011","doc_id":"S100YE06","period_end":"2026-03-31","holder_table":"reporting","shares":49400,"book_value_yen":410000000,"prior_shares":49400,"prior_book_value_yen":256000000,"purpose_ja":"　舗装工事関係取引（材料・工事の受発注）を行っており、取引関係の維持・発展を目的に株式を保有しております。 ","reciprocal":"有","pct_outstanding":0.5892097564070895,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.5145969827045209,"pct_of_holder_assets":0.3343745157686128,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":79674000000,"holder_total_assets_yen":122617000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"株式会社リンコーコーポレーション","holder_name_en":"RINKO CORPORATION","holder_sec_code":"9355","doc_id":"S100YHZP","period_end":"2026-03-31","holder_table":"reporting","shares":18616,"book_value_yen":154513000,"prior_shares":18197,"prior_book_value_yen":94626000,"purpose_ja":"　同社は、当社企業グループの大型施設の建設及び維持管理等の主要な依頼先のひとつであり、良好な関係を維持するため、株式を相互保有しております。また、当社は同社の持株会に加入しており、同会を通じた定期買付により株式数が増加しております。定量的な保有効果は、主に建設・修繕費用等に関する取引上の機密情報をもとに検証するため記載困難でありますが、上記２　①のとおり取締役会等で、株価や配当の他、今後の事業展開を見据えた協力関係維持の重要性を検証しております。","reciprocal":"有","pct_outstanding":0.22203904504604005,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.7753562826174227,"pct_of_holder_assets":0.387960428854797,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":19928000000,"holder_total_assets_yen":39827000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"京葉瓦斯株式会社","holder_name_en":"KEIYO GAS CO., LTD.","holder_sec_code":"9539","doc_id":"S100XTA9","period_end":"2025-12-31","holder_table":"reporting","shares":6732,"book_value_yen":50000000,"prior_shares":6732,"prior_book_value_yen":35000000,"purpose_ja":"事業運営上の関係維持・強化、主にエネルギーセグメントにおける取引・関係  ","reciprocal":"有","pct_outstanding":0.0802947384642212,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.04783087004352609,"pct_of_holder_assets":0.028081526287116756,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":104535000000,"holder_total_assets_yen":178053000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"ダイダン株式会社","holder_name_en":"DAI-DAN CO., LTD.","holder_sec_code":"1980","doc_id":"S100Z203","period_end":"2026-03-31","holder_table":"reporting","shares":3300,"book_value_yen":27000000,"prior_shares":3300,"prior_book_value_yen":17000000,"purpose_ja":"今後の工事受注を主とした取引関係強化のために保有しております。定量的な保有効果につきましては、保有先の機密保持の観点から記載しておりませんが、同社株式について、良好な取引関係の維持と強化が長期的・安定的な企業価値に繋がること及び関連する取引利益や配当金等を含めた株式保有による収益が資本コストを上回っていることを検証し、保有意義の確認を行っております。","reciprocal":"無","pct_outstanding":0.03936016591383392,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.020319237802813087,"pct_of_holder_assets":0.01163422011944466,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":132879000000,"holder_total_assets_yen":232074000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社トスネット","holder_name_en":"TOSNET CORPORATION","holder_sec_code":"4754","doc_id":"S100XBF5","period_end":"2025-09-30","holder_table":"reporting","shares":3000,"book_value_yen":21150000,"prior_shares":3000,"prior_book_value_yen":16140000,"purpose_ja":"主に警備事業における業務上の取引関係の強化及び安定的な業務受注の確保を目的として保有しております。定量的な保有効果は個別の取引条件等に関わるため記載しておりませんが、定期的に保有の妥当性を検証しております。(注)２","reciprocal":"無","pct_outstanding":0.03578196901257629,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.24951412580278073,"pct_of_holder_assets":0.18761290038721884,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":8476474000,"holder_total_assets_yen":11273212000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"北越メタル株式会社","holder_name_en":"HOKUETSU METAL Co., Ltd.","holder_sec_code":"5446","doc_id":"S100YG3Z","period_end":"2026-03-31","holder_table":"reporting","shares":2244,"book_value_yen":18625000,"prior_shares":2244,"prior_book_value_yen":11668000,"purpose_ja":"（保有目的）商社を介して当社の鉄鋼製品が主に地域の建設工事に使用されており、取引協力関係の維持、強化により中長期的な企業価値の向上に資すると判断し保有している。（定量的な保有効果）保有目的に鑑み記載は困難であるが、取締役会等において年に１回以上資本コスト等を踏まえた経済合理性の観点からも保有の妥当性を検証している。","reciprocal":"無","pct_outstanding":0.026764912821407062,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.10397238716693248,"pct_of_holder_assets":0.0720568686348154,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":17913410000,"holder_total_assets_yen":25847640000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"酒井重工業株式会社","holder_name_en":"SAKAI HEAVY INDUSTRIES, LTD.","holder_sec_code":"6358","doc_id":"S100YKE1","period_end":"2026-03-31","holder_table":"reporting","shares":2200,"book_value_yen":18260000,"prior_shares":2200,"prior_book_value_yen":11440000,"purpose_ja":"業種的な側面から将来的な取引の可能性を踏まえて保有。","reciprocal":"無","pct_outstanding":0.02624011060922261,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.05764397640650355,"pct_of_holder_assets":0.04156016022101811,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":31677204000,"holder_total_assets_yen":43936308000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社ユアテック","holder_name_en":"YURTEC CORPORATION","holder_sec_code":"1934","doc_id":"S100YHQP","period_end":"2026-03-31","holder_table":"reporting","shares":2244,"book_value_yen":18000000,"prior_shares":2244,"prior_book_value_yen":11000000,"purpose_ja":"幅広い顧客基盤を持つ取引先として設備工事を請け負っており、関係強化により中長期的な工事受注獲得による収益向上をはかるため継続して保有している。","reciprocal":"無","pct_outstanding":0.026764912821407062,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.011586292129045547,"pct_of_holder_assets":0.00786204727711096,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":155356000000,"holder_total_assets_yen":228948000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"株式会社共立メンテナンス","holder_name_en":"KYORITSU MAINTENANCE CO.,LTD.","holder_sec_code":"9616","doc_id":"S100YIIM","period_end":"2026-03-31","holder_table":"reporting","shares":2000,"book_value_yen":16000000,"prior_shares":2000,"prior_book_value_yen":10000000,"purpose_ja":"（保有目的）主に寮・ホテル事業の取引関係等の円滑化を目的として保有（定量的な保有効果）（注）１","reciprocal":"有","pct_outstanding":0.023854646008384193,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.010994447803859051,"pct_of_holder_assets":0.0050528177353902515,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":145528000000,"holder_total_assets_yen":316655000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"株式会社植木組","holder_name_en":"UEKI CORPORATION","holder_sec_code":"1867","doc_id":"S100YIPR","period_end":"2026-03-31","holder_table":"reporting","shares":758,"book_value_yen":6291000,"prior_shares":758,"prior_book_value_yen":3941000,"purpose_ja":"保有による関係の強化により、建設業のDX化推進に向けて中長期的に情報交換を行うことで、企業価値の向上に資すると判断しております。また、建設工事共同企業体として共同で施工を行った実績があります。","reciprocal":"無","pct_outstanding":0.00904091083717761,"pct_unavailable":null,"pct_basis_period_end":"2025-12-31","pct_share_classes":1,"pct_of_holder_equity":0.01977436292038202,"pct_of_holder_assets":0.011166362507092797,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":31813920000,"holder_total_assets_yen":56338848000,"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．豊田通商㈱については、保有株式の全部を売却していることから、当事業年度の株式数は「－」としております。"},{"holder_table":"reporting","note_no":"2","text_ja":"２．イオン㈱については、2025年７月１日付でイオンモール㈱と株式交換しております。これに伴い、イオンモール㈱の普通株式１株に対して、イオン㈱の普通株式0.65株が割当交付されております。"},{"holder_table":"reporting","note_no":"3","text_ja":"３．当社は、特定投資株式における定量的な保有効果の記載が困難であるため、保有の合理性を検証した方法について記載いたします。当社は、毎期、取締役会等において、個別の政策保有株式について政策保有の意義を検証しており、2025年12月31日を基準とした検証の結果、現状保有する政策保有株式は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おります。"},{"holder_table":"reporting","note_no":"4","text_ja":"４．㈱第四北越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㈱第四北越銀行及び第四ジェーシービーカード㈱は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"5","text_ja":"５．㈱三菱ＵＦＪ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㈱三菱ＵＦＪ銀行、三菱ＵＦＪ信託銀行㈱、並びに㈱三菱ＵＦＪモルガン・スタンレー証券は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"6","text_ja":"６．東北電力㈱は当社株式を保有しておりませんが、同社子会社である㈱ユアテックは当社株式を保有しております。"},{"holder_table":"reporting","note_no":"7","text_ja":"７．㈱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、同社子会社であるみずほ証券㈱は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"8","text_ja":"８．第一生命ホールディングス㈱は当社株式を保有しておりませんが、同社子会社である第一生命保険㈱は当社株式を保有しております。"},{"holder_table":"reporting","note_no":"9","text_ja":"９．㈱三井住友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ＳＭＢＣ日興証券㈱は当社株式を保有しております。"}],"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":5000000,"issues_decreased":2,"sale_proceeds_yen":2000000,"entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","issues_increased":1,"acquisition_cost_yen":3000000,"issues_decreased":4,"sale_proceeds_yen":251000000,"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":3961000000,"listed_yen":3325000000,"unlisted_yen":636000000,"listed_issues":28,"unlisted_issues":46,"equity_yen":90166000000,"equity_basis":"jgaap_consolidated","total_assets_yen":147476000000,"assets_basis":"jgaap_consolidated","pct_of_equity":4.393008451079121,"pct_of_assets":2.6858607502237652,"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":3325000000,"issue_count":28,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","book_value_yen":636000000,"issue_count":46,"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":2533000000,"equity_yen":76412000000,"equity_basis":"jgaap_consolidated","pct_of_equity":3.31492435743077,"pct_of_assets":1.9372108141180069},{"year":"2022","period_end":"2022-12-31","policy_total_yen":2723000000,"equity_yen":78504000000,"equity_basis":"jgaap_consolidated","pct_of_equity":3.4686130643024558,"pct_of_assets":2.02678059709269},{"year":"2023","period_end":"2023-12-31","policy_total_yen":3102000000,"equity_yen":80333000000,"equity_basis":"jgaap_consolidated","pct_of_equity":3.8614268108996304,"pct_of_assets":2.26868815411282},{"year":"2024","period_end":"2024-12-31","policy_total_yen":3479000000,"equity_yen":85407000000,"equity_basis":"jgaap_consolidated","pct_of_equity":4.073436603557085,"pct_of_assets":2.436035682776198},{"year":"2025","period_end":"2025-12-31","policy_total_yen":3961000000,"equity_yen":90166000000,"equity_basis":"jgaap_consolidated","pct_of_equity":4.393008451079121,"pct_of_assets":2.6858607502237652}],"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":33,"book_value_yen":1568000000},{"year":"2022","period_end":"2022-12-31","named_holdings":32,"book_value_yen":1708000000},{"year":"2023","period_end":"2023-12-31","named_holdings":31,"book_value_yen":2097000000},{"year":"2024","period_end":"2024-12-31","named_holdings":30,"book_value_yen":2567000000},{"year":"2025","period_end":"2025-12-31","named_holdings":30,"book_value_yen":3309000000}],"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."}}