Who has been buying Sekisui Chemical Co., Ltd. stock?

20 distinct investors have filed 25 disclosed large-shareholding filings in Sekisui Chemical Co., Ltd. (4204), most recently on 2025-09-19. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does Sekisui Chemical Co., Ltd. have?

Sekisui Chemical Co., Ltd. has 25 buy-side and 9 sell-side disclosures on record, covering ¥55.4B ($357.5M) in total reported value, spanning 2021-06-28 to 2025-09-19.

Where does StockDrifts get Sekisui Chemical Co., Ltd. insider data?

From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.

Do insider buys in Japanese stocks predict returns?

Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Sekisui Chemical Co., Ltd. 4204

Company

積水化学工業株式会社Sekisui Chemical Co., Ltd.

Investors

Buys

Total Value

¥55.4B ($357.5M)

Avg Return

+16.80%

Last Filing

2025-09-19

Sekisui Chemical Co., Ltd. (4204) has 25 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 20 distinct investors. Together those filings cover ¥55.4B ($357.5M) in reported transaction value. The earliest filing StockDrifts holds for Sekisui Chemical Co., Ltd. is dated 2021-06-28; the most recent is 2025-09-19. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is +16.80%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-06-05	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	2.4M	¥2,316	+14.0%	¥4.7B ($30.3M)
2026-06-05	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ. BlackRock Institutional Trust Company, N.A.	passive	3.5M	¥2,316	-14.0%	¥4.0B ($26.1M)
2026-06-05	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	5.0M	¥2,316	-14.0%	¥7.0B ($45.4M)
2026-06-05	SELL	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	801.2K	¥2,316	-14.0%	¥3.6B ($23.0M)
2026-06-05	SELL	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	242.8K	¥2,316	-14.0%	¥751M ($4.8M)
2026-06-05	SELL	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	1.4M	¥2,316	-14.0%	¥1.4B ($9.1M)
2026-06-05	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	729.2K	¥2,316	-14.0%	¥2.5B ($16.4M)
2026-06-05	SELL	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク BlackRock Financial Management, Inc.	passive	338.3K	¥2,316	-14.0%	¥1.4B ($9.1M)
2026-06-05	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	6.9M	¥2,316	-14.0%	¥3.5B ($22.4M)
2026-06-04	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	18.1M	¥2,373.5	+11.2%	¥10.3B ($66.4M)
2026-06-04	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	10.4M	¥2,373.5	-11.2%	¥770M ($5.0M)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	14.9M	¥2,865	-10.8%	¥5.3B ($34.2M)
2025-09-19	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	11.6M	¥2,865	-10.8%	¥1.4B ($9.0M)
2024-10-07	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	1.9M	¥2,280.5	+12.1%	¥4.4B ($28.6M)
2024-10-07	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.4M	¥2,280.5	+12.1%	¥10.0B ($64.6M)
2024-10-07	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	12.4M	¥2,280.5	+12.1%	¥28.2B ($181.9M)
2024-10-07	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	3.7M	¥2,280.5	+12.1%	¥8.5B ($54.9M)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	11.6M	¥2,250	-13.6%	¥8.6B ($55.5M)
2024-07-29	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.4M	¥2,250	+13.6%	¥6.5B ($41.9M)
2024-07-29	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	3.7M	¥2,250	-13.6%	¥6.8B ($43.9M)
2024-06-20	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	13.2M	¥2,189.5	+16.8%	¥9.8B ($63.4M)
2024-06-20	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	11.2M	¥2,189.5	-16.8%	¥5.3B ($33.9M)
2024-03-22	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	9.3M	¥2,249.5	+13.7%	¥3.5B ($22.8M)
2024-03-22	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	5.8M	¥2,249.5	+13.7%	¥1.4B ($9.1M)
2024-03-22	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	627.4K	¥2,249.5	+13.7%	¥101M ($651K)
2024-03-22	SELL	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	453.0K	¥2,249.5	-13.7%	¥202M ($1.3M)
2024-03-22	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	8.9M	¥2,249.5	+13.7%	¥2.8B ($18.2M)
2024-03-22	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	2.6M	¥2,249.5	+13.7%	¥605M ($3.9M)
2024-03-22	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	2.3M	¥2,249.5	+13.7%	¥908M ($5.9M)
2024-03-22	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.0M	¥2,249.5	+13.7%	¥605M ($3.9M)
2024-03-22	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management BlackRock Financial Management, Inc.	passive	1.0M	¥2,249.5	+13.7%	¥807M ($5.2M)
2023-09-08	SELL	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	18.1M	¥2,218	-15.3%	¥10.2B ($66.0M)
2023-06-06	SELL	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	561.9K	¥2,028.5	-26.1%	¥6M ($36K)
2023-06-06	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	5.3M	¥2,028.5	-26.1%	¥10M ($65K)
2023-06-06	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	7.7M	¥2,028.5	+26.1%	¥68M ($438K)
2023-06-06	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	2.4M	¥2,028.5	+26.1%	¥19M ($124K)
2023-06-06	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	606.7K	¥2,028.5	+26.1%	¥1.2B ($7.9M)
2023-06-06	BUY	Market Buy	ブラックロック・ライフ・リミテッド BlackRock Life Limited	passive	109.7K	¥2,028.5	+26.1%	¥163M ($1.1M)
2023-06-06	SELL	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	22.2K	¥2,028.5	-26.1%	¥19M ($124K)
2023-06-06	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	1.9M	¥2,028.5	+26.1%	¥3.8B ($24.7M)
2023-06-06	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	1.8M	¥2,028.5	+26.1%	¥3.6B ($23.0M)
2023-06-06	SELL	Market Buy	ブラックロック・インベストメント・マネジメント・エルエルシー BlackRock Investment Management LLC	passive	369.8K	¥2,028.5	-26.1%	¥5M ($30K)
2023-06-06	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management BlackRock Financial Management, Inc.	passive	699.0K	¥2,028.5	+26.1%	¥1.4B ($9.1M)
2023-06-06	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers BlackRock Advisers, LLC	passive	213.5K	¥2,028.5	+26.1%	¥422M ($2.7M)
2023-06-06	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	7.8M	¥2,028.5	+26.1%	¥27M ($172K)
2023-05-19	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.9M	¥2,020	+26.6%	¥18.0B ($116.1M)
2023-05-19	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	14.0M	¥2,020	+26.6%	¥28.3B ($182.8M)
2022-06-27	BUY	Market Buy	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	23.3M	¥1,884	+35.7%	¥175M ($1.1M)
2021-06-28	BUY	acquisition	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	23.6M	¥1,905	+34.2%	¥45.0B ($290.3M)

Frequently asked questions

Who has been buying Sekisui Chemical Co., Ltd. stock?: 20 distinct investors have filed 25 disclosed large-shareholding filings in Sekisui Chemical Co., Ltd. (4204), most recently on 2025-09-19. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does Sekisui Chemical Co., Ltd. have?: Sekisui Chemical Co., Ltd. has 25 buy-side and 9 sell-side disclosures on record, covering ¥55.4B ($357.5M) in total reported value, spanning 2021-06-28 to 2025-09-19.
Where does StockDrifts get Sekisui Chemical Co., Ltd. insider data?: From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
Do insider buys in Japanese stocks predict returns?: Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for Sekisui Chemical Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.