Who has been buying Chemipro Kasei Kaisha, Ltd. stock?

3 distinct investors have filed 9 disclosed large-shareholding filings in Chemipro Kasei Kaisha, Ltd. (4960), most recently on 2026-02-09. 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 Chemipro Kasei Kaisha, Ltd. have?

Chemipro Kasei Kaisha, Ltd. has 9 buy-side and 2 sell-side disclosures on record, covering ¥1.5B ($9.5M) in total reported value, spanning 2022-04-26 to 2026-02-09.

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.

Chemipro Kasei Kaisha, Ltd. 4960

Company

ケミプロ化成株式会社Chemipro Kasei Kaisha, Ltd.

Investors

Buys

Total Value

¥1.5B ($9.5M)

Avg Return

+152.67%

Last Filing

2026-02-09

Chemipro Kasei Kaisha, Ltd. (4960) has 9 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥1.5B ($9.5M) in reported transaction value. The earliest filing StockDrifts holds for Chemipro Kasei Kaisha, Ltd. is dated 2022-04-26; the most recent is 2026-02-09. Across these filings the average return since disclosure is +152.67%, 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
2026-09-04	BUY	unknown	株式会社ケアシステムズ代表取締役小林秀樹 CARE SYSTEMS INC.	other	400	¥659	-	¥2.3B ($14.7M)
2026-09-04	SELL	unknown	株式会社ケアシステムズ代表取締役小林秀樹 CARE SYSTEMS INC.	other	400	¥659	+15.9%	¥2.3B ($14.7M)
2026-09-01	BUY	Market Buy	Sudian Investment Co. Limited	passive	3.5M	¥552	+0.4%	¥1.9B ($12.3M)
2026-07-21	BUY	block_purchase	福岡靖介 SEISUKE FUKUOKA	other	1.7M	¥507	+9.3%	¥84M ($544K)
2026-05-29	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.4M	¥616	-10.1%	¥103M ($667K)
2026-02-09	SELL	unknown	福岡靖介 SEISUKE FUKUOKA	other	1.2M	¥934	+40.7%	¥171M ($1.1M)
2026-02-09	BUY	unknown	福岡靖介 SEISUKE FUKUOKA	other	1.2M	¥934	-	¥172M ($1.1M)
2026-02-05	SELL	unknown	福岡　靖介 SEISUKE FUKUOKA	other	1.4M	¥922	+39.9%	¥285M ($1.8M)
2024-07-03	BUY	unknown	福岡靖介 SEISUKE FUKUOKA	other	1.7M	¥390	-	¥65M ($422K)
2024-07-03	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.7M	¥390	+42.0%	¥65M ($422K)
2024-04-26	BUY	unknown	株式会社ケアシステムズ代表取締役小林秀樹 CARE SYSTEMS INC.	activist	3.5M	¥394	-	-
2024-04-26	BUY	unknown	株式会社ケアシステムズ CARE SYSTEMS INC.	activist	3.5M	¥394	+40.6%	-
2024-01-26	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.5M	¥364	+52.2%	¥61M ($390K)
2023-12-22	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.4M	¥320	+73.1%	¥53M ($343K)
2023-08-17	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.2M	¥271	+104.4%	¥49M ($317K)
2023-02-28	BUY	unknown	福岡靖介 SEISUKE FUKUOKA	other	1.0M	¥300	-	¥54M ($351K)
2023-02-28	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	1.0M	¥300	+84.7%	¥54M ($351K)
2023-02-09	BUY	unknown	福岡靖介 SEISUKE FUKUOKA	other	844.7K	¥294	+88.4%	¥248M ($1.6M)
2022-11-24	BUY	Market Buy	福岡靖介 SEISUKE FUKUOKA	other	178.2K	¥277	+100.0%	¥49M ($318K)
2022-04-26	BUY	Market Buy	ケミプロ化成取引先持株会理事長竹内真一 takeuti siniti	other	999.5K	¥270	+105.2%	¥45M ($292K)

Frequently asked questions

Who has been buying Chemipro Kasei Kaisha, Ltd. stock?: 3 distinct investors have filed 9 disclosed large-shareholding filings in Chemipro Kasei Kaisha, Ltd. (4960), most recently on 2026-02-09. 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 Chemipro Kasei Kaisha, Ltd. have?: Chemipro Kasei Kaisha, Ltd. has 9 buy-side and 2 sell-side disclosures on record, covering ¥1.5B ($9.5M) in total reported value, spanning 2022-04-26 to 2026-02-09.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.