{"entity":{"edinet_code":"E00845","sec_code":"4228","name_ja":"積水化成品工業株式会社","name_en":"Sekisui Kasei Co., Ltd.","industry":"化学","industry_en":"Chemicals"},"names_note":"English company names are as filed: each company's own annual report states its English name on the cover page. For a company that files no annual report, EDINET's filer registry is used instead. The as-filed Japanese name is always returned alongside.","filing":{"doc_id":"S100YI2M","filer_name":"積水化成品工業株式会社","filer_name_en":"Sekisui Kasei Co., Ltd.","period_end":"2026-03-31","filed_date":"2026-06-23","sha256":"9745cbe1c298528fb69fcffd4c051dc9fa576c0d912f36c0fcc3b719c0554d98","status":"clean"},"basis":{"measurement":"carrying_amount","entity_scope":"parent_only","share_scope":"both","trust_included":"unknown","as_of":"2026-03-31","period_type":"annual","labels":{"measurement":"Balance-sheet carrying amount. Under Japanese GAAP listed equities are carried at market with the valuation difference in other comprehensive income, so carrying amount and acquisition cost diverge enormously on positions bought decades ago.","entity_scope":"The reporting company itself (提出会社) — the holding company, excluding the group holders it names separately.","share_scope":"Listed and unlisted shares together.","trust_included":"The filing does not state whether retirement-benefit-trust shares are included. Never guessed — shares contributed to such a trust leave the holder's balance sheet while the settlor normally keeps the right to instruct the vote.","period_type":"From an annual securities report (有価証券報告書). The policy shareholding table appears only in the annual report."},"not_comparable":"Figures are balance-sheet CARRYING AMOUNT at fiscal year end, from the annual securities report. They are NOT comparable with the acquisition-cost or book-value-reduction figures quoted in press coverage and IR presentations, and NOT comparable with interim (half-year) figures, which this product does not hold. Always state the basis with the number, and use check_claim before setting one of our figures against a published one."},"basis_note":"The basis every yen figure on this response is on. entity_scope is read from the filing's own disclosing entities, not assumed: scale_entities and flows each carry their own entity_scope and share_scope, and a figure quoted for one entity is not the group figure.","holdings":[{"holder_table":"reporting","held_name_raw":"㈱エフピコ","held_name_en":"FP CORPORATION","held_sec_code":"7947","match_status":"matched","shares":2480460,"book_value_yen":5839000000,"prior_shares":2865460,"prior_book_value_yen":8083000000,"purpose_ja":"保有目的・効果：当社のシート事業の取引先であり、関係を維持・強化することが、当社の中長期的な企業価値向上に資すると判断し、保有しております。","reciprocal":"有","pct_outstanding":3.0669601961620057,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":11.461379919521052,"pct_of_holder_assets":4.772179314290384,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":50945000000,"holder_total_assets_yen":122355000000,"implausible":false,"reciprocal_held_both_ways":true,"corporate_actions":[],"note_refs":[],"share_ratio":null,"reclassified_to_pure":false},{"holder_table":"reporting","held_name_raw":"積水樹脂㈱","held_name_en":"Sekisui Jushi Corporation","held_sec_code":"4212","match_status":"matched","shares":816410,"book_value_yen":1730000000,"prior_shares":816410,"prior_book_value_yen":1562000000,"purpose_ja":"保有目的・効果：積水ブランドを維持・強化している重要なパートナーであり、また住環境システム事業の取引先として、関係を維持・強化することが、当社の中長期的な企業価値向上に資すると判断し、保有しております。","reciprocal":"有","pct_outstanding":2.7169201551407633,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":3.395819020512317,"pct_of_holder_assets":1.4139185157942054,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":50945000000,"holder_total_assets_yen":122355000000,"implausible":false,"reciprocal_held_both_ways":true,"corporate_actions":[],"note_refs":[],"share_ratio":null,"reclassified_to_pure":false},{"holder_table":"reporting","held_name_raw":"積水ハウス㈱","held_name_en":"Ｓｅｋｉｓｕｉ Ｈｏｕｓｅ, Ｌｔｄ.","held_sec_code":"1928","match_status":"matched","shares":50000,"book_value_yen":176000000,"prior_shares":50000,"prior_book_value_yen":167000000,"purpose_ja":"保有目的・効果：積水ブランドを維持・強化している重要なパートナーであり、また樹脂事業の取引先として、関係を維持・強化することが、当社の中長期的な企業価値向上に資すると判断し、保有しております。","reciprocal":"有","pct_outstanding":0.007717701709303917,"pct_unavailable":null,"pct_basis_period_end":"2026-01-31","pct_share_classes":1,"pct_of_holder_equity":0.3454706055550103,"pct_of_holder_assets":0.14384373339871684,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":50945000000,"holder_total_assets_yen":122355000000,"implausible":false,"reciprocal_held_both_ways":true,"corporate_actions":[],"note_refs":[],"share_ratio":null,"reclassified_to_pure":false}],"holders":[{"holder_name":"積水樹脂株式会社","holder_name_en":"Sekisui Jushi Corporation","holder_sec_code":"4212","doc_id":"S100YIY2","period_end":"2026-03-31","holder_table":"reporting","shares":1419500,"book_value_yen":613000000,"prior_shares":1419500,"prior_book_value_yen":505000000,"purpose_ja":"共同して積水ブランドを維持・強化している重要なパートナーであり、当社製品の共同提案等関係を維持・強化することが、中長期的な企業価値向上に資すると判断して保有している。(注)１","reciprocal":"有","pct_outstanding":3.1141467625082355,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.606312374509164,"pct_of_holder_assets":0.429970259805847,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":101103000000,"holder_total_assets_yen":142568000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"株式会社エフピコ","holder_name_en":"FP CORPORATION","holder_sec_code":"7947","doc_id":"S100YDYF","period_end":"2026-03-31","holder_table":"reporting","shares":1348933,"book_value_yen":582000000,"prior_shares":1348933,"prior_book_value_yen":480000000,"purpose_ja":"当社製品原材料の安定供給等取引関係維持強化を図るため。定量的な保有効果については秘密保持の観点から記載しておりません。経済合理性の検証は、取引金額、受取配当金、株式評価損益等を資本コストと比較し、資本コストを上回るかどうかを検証しております。","reciprocal":"有","pct_outstanding":2.959334508482227,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.35236209746262964,"pct_of_holder_assets":0.19140833119561143,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":165171000000,"holder_total_assets_yen":304062000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"積水ハウス株式会社","holder_name_en":"Ｓｅｋｉｓｕｉ Ｈｏｕｓｅ, Ｌｔｄ.","holder_sec_code":"1928","doc_id":"S100XZ22","period_end":"2026-01-31","holder_table":"reporting","shares":100000,"book_value_yen":42000000,"prior_shares":100000,"prior_book_value_yen":35000000,"purpose_ja":"住宅関連部材の仕入先として、今後の同社との安定的な取引関係の維持・強化を目的とする。","reciprocal":"有","pct_outstanding":0.21938335769695214,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.0019193533424395985,"pct_of_holder_assets":0.0008388864621101949,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":2188237000000,"holder_total_assets_yen":5006637000000,"implausible":false,"reciprocal_held_both_ways":true},{"holder_name":"高島株式会社","holder_name_en":"Takashima & Co.,Ltd.","holder_sec_code":"8007","doc_id":"S100YCID","period_end":"2026-03-31","holder_table":"reporting","shares":25000,"book_value_yen":10000000,"prior_shares":25000,"prior_book_value_yen":8000000,"purpose_ja":"（保有目的）建設資材及び産業資材を製造する取引先であります。継続保有することで、商圏の維持が見込まれることから当該株式を保有しております。（業務提携等の概要）該当事項はありません。（定量的な保有効果）該当事項はありません。（注）2（株式数が増加した理由）当事業年度において、株式数は増加しておりません。","reciprocal":"無","pct_outstanding":0.054845839424238034,"pct_unavailable":null,"pct_basis_period_end":"2026-03-31","pct_share_classes":1,"pct_of_holder_equity":0.04316112046268721,"pct_of_holder_assets":0.017516202487300753,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":23169000000,"holder_total_assets_yen":57090000000,"implausible":false,"reciprocal_held_both_ways":false},{"holder_name":"協栄産業株式会社","holder_name_en":"KYOEI SANGYO CO.,LTD.","holder_sec_code":"6973","doc_id":"S100W475","period_end":"2025-03-31","holder_table":"reporting","shares":5500,"book_value_yen":1958000,"prior_shares":5500,"prior_book_value_yen":2794000,"purpose_ja":"産業機器システム事業の取引先であり、取引関係の維持強化のため、同社株式を保有しております。同社に対し、主に化成品関連の購入を行うなど継続的な取引があり、保有に見合う便益が得られ、当社の企業価値向上につながるものと判断しております。","reciprocal":"無","pct_outstanding":0.01210171362685299,"pct_unavailable":null,"pct_basis_period_end":"2025-03-31","pct_share_classes":1,"pct_of_holder_equity":0.010307566627784294,"pct_of_holder_assets":0.005171091422757138,"holder_equity_basis":"jgaap_consolidated","holder_equity_yen":18995754000,"holder_total_assets_yen":37864347000,"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":"２．貸借対照表計上額の上位銘柄を選定する段階で、特定投資株式とみなし保有株式を合算しておりません。"}],"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":1,"sale_proceeds_yen":968000000,"entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","issues_increased":null,"acquisition_cost_yen":null,"issues_decreased":1,"sale_proceeds_yen":0,"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":7807000000,"listed_yen":7745000000,"unlisted_yen":62000000,"listed_issues":3,"unlisted_issues":13,"equity_yen":50945000000,"equity_basis":"jgaap_consolidated","total_assets_yen":122355000000,"assets_basis":"jgaap_consolidated","pct_of_equity":15.324369417999804,"pct_of_assets":6.380613787748763,"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":7745000000,"issue_count":3,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"listed"},{"holder_table":"reporting","share_class":"unlisted","book_value_yen":62000000,"issue_count":13,"holder_table_label":"The filer itself","entity_scope":"parent_only","share_scope":"unlisted"}],"scale_history":[{"year":"2022","period_end":"2022-03-31","policy_total_yen":12885000000,"equity_yen":58242000000,"equity_basis":"jgaap_consolidated","pct_of_equity":22.123210054599774,"pct_of_assets":8.991124012616183},{"year":"2023","period_end":"2023-03-31","policy_total_yen":11961000000,"equity_yen":58464000000,"equity_basis":"jgaap_consolidated","pct_of_equity":20.45874384236453,"pct_of_assets":8.239021870156707},{"year":"2024","period_end":"2024-03-31","policy_total_yen":10633000000,"equity_yen":56821000000,"equity_basis":"jgaap_consolidated","pct_of_equity":18.713151827669346,"pct_of_assets":7.259358380042738},{"year":"2025","period_end":"2025-03-31","policy_total_yen":9876000000,"equity_yen":49670000000,"equity_basis":"jgaap_consolidated","pct_of_equity":19.883229313468895,"pct_of_assets":7.249078817950939},{"year":"2026","period_end":"2026-03-31","policy_total_yen":7807000000,"equity_yen":50945000000,"equity_basis":"jgaap_consolidated","pct_of_equity":15.324369417999804,"pct_of_assets":6.380613787748763}],"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":"2022","period_end":"2022-03-31","named_holdings":7,"book_value_yen":12850000000},{"year":"2023","period_end":"2023-03-31","named_holdings":6,"book_value_yen":11927000000},{"year":"2024","period_end":"2024-03-31","named_holdings":4,"book_value_yen":10600000000},{"year":"2025","period_end":"2025-03-31","named_holdings":3,"book_value_yen":9812000000},{"year":"2026","period_end":"2026-03-31","named_holdings":3,"book_value_yen":7745000000}],"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."}}