Who has been buying Koei Chemical Company, Limited stock?

3 distinct investors have filed 4 disclosed large-shareholding filings in Koei Chemical Company, Limited (4367), most recently on 2026-05-14. 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 Koei Chemical Company, Limited have?

Koei Chemical Company, Limited has 4 buy-side and 0 sell-side disclosures on record, covering ¥4.5B ($29.3M) in total reported value, spanning 2022-04-05 to 2026-05-14.

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.

Koei Chemical Company, Limited 4367

Company

広栄化学株式会社Koei Chemical Company, Limited

Investors

Buys

Total Value

¥4.5B ($29.3M)

Avg Return

-7.33%

Last Filing

2026-05-14

Koei Chemical Company, Limited (4367) has 4 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥4.5B ($29.3M) in reported transaction value. The earliest filing StockDrifts holds for Koei Chemical Company, Limited is dated 2022-04-05; the most recent is 2026-05-14. Across these filings the average return since disclosure is -7.33%, 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
2026-07-03	BUY	acquisition	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	corporate	2.7M	¥2,749	-	-
2026-05-14	BUY	acquisition	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	corporate	2.7M	¥2,929	-	-
2023-05-30	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	2.7M	¥2,330	-	-
2023-05-30	BUY	unknown	田岡化学工業株式会社 Taoka Chemical Company, Limited	strategic	10.0K	¥2,330	-	-
2023-05-30	BUY	unknown	住化カラー株式会社 Sumika Color Co., Ltd.	strategic	6.0K	¥2,330	-	-
2022-04-05	BUY	unknown	住化カラー株式会社 Sumika Color Co., Ltd.	unknown	6.0K	¥2,320	-	-
2022-04-05	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	2.7M	¥2,320	+9.9%	¥5M ($29K)
2022-04-05	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	2.7M	¥2,320	+9.9%	¥5M ($29K)
2022-04-05	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	2.7M	¥2,320	-	-
2022-04-05	BUY	unknown	田岡化学工業株式会社 Taoka Chemical Company, Limited	strategic	10.0K	¥2,320	+9.9%	¥2.3B ($14.7M)
2022-04-05	BUY	unknown	住化カラー株式会社 Sumika Color Co., Ltd.	strategic	6.0K	¥2,320	-	-
2022-04-05	BUY	unknown	田岡化学工業株式会社 Taoka Chemical Company, Limited	strategic	10.0K	¥2,320	+9.9%	¥2.3B ($14.7M)
2022-04-05	BUY	unknown	住化カラー株式会社 Sumika Color Co., Ltd.	strategic	6.0K	¥2,320	-	-

Frequently asked questions

Who has been buying Koei Chemical Company, Limited stock?: 3 distinct investors have filed 4 disclosed large-shareholding filings in Koei Chemical Company, Limited (4367), most recently on 2026-05-14. 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 Koei Chemical Company, Limited have?: Koei Chemical Company, Limited has 4 buy-side and 0 sell-side disclosures on record, covering ¥4.5B ($29.3M) in total reported value, spanning 2022-04-05 to 2026-05-14.
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.