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

4 distinct investors have filed 11 disclosed large-shareholding filings in Konoshima Chemical Co.,Ltd. (4026), most recently on 2025-05-08. 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 Konoshima Chemical Co.,Ltd. have?

Konoshima Chemical Co.,Ltd. has 11 buy-side and 13 sell-side disclosures on record, covering ¥1.7B ($10.9M) in total reported value, spanning 2021-06-22 to 2025-05-08.

Where does StockDrifts get Konoshima 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.

Konoshima Chemical Co.,Ltd. 4026

Company

神島化学工業株式会社Konoshima Chemical Co.,Ltd.

Investors

Buys

Total Value

¥1.7B ($10.9M)

Avg Return

-1.13%

Last Filing

2025-05-08

Konoshima Chemical Co.,Ltd. (4026) has 11 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.7B ($10.9M) in reported transaction value. The earliest filing StockDrifts holds for Konoshima Chemical Co.,Ltd. is dated 2021-06-22; the most recent is 2025-05-08. 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 -1.13%, 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
2025-05-08	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	454.7K	¥1,272	-47.8%	¥150M ($971K)
2023-06-06	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	572.9K	¥1,600	+17.5%	¥176M ($1.1M)
2023-03-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	462.8K	¥1,759	+6.9%	¥814M ($5.3M)
2022-06-20	BUY	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	77.2K	¥1,059	+77.5%	¥76M ($492K)
2022-06-03	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	559.5K	¥1,405	-33.8%	¥12M ($75K)
2022-05-19	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	568.6K	¥1,378	-36.4%	¥18M ($115K)
2022-04-21	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	581.1K	¥1,535	-22.5%	¥34M ($220K)
2022-03-22	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	603.2K	¥1,587	-18.5%	¥9M ($57K)
2022-03-07	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	608.9K	¥1,601	-17.4%	¥13M ($86K)
2022-02-22	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	617.2K	¥1,626	-15.6%	¥251M ($1.6M)
2022-02-09	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	1.1M	¥1,810	+3.9%	¥840M ($5.4M)
2022-02-09	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	771.5K	¥1,810	-3.9%	¥544M ($3.5M)
2022-02-04	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	607.7K	¥1,837	+2.3%	¥19M ($120K)
2022-01-20	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	597.4K	¥1,974	-4.8%	¥46M ($294K)
2022-01-06	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	574.6K	¥2,095	+10.3%	¥4M ($25K)
2021-12-06	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	576.5K	¥2,641	+28.8%	¥10M ($63K)
2021-11-19	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	580.0K	¥2,919	+35.6%	¥11M ($70K)
2021-11-05	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	584.3K	¥2,920	-35.6%	¥3M ($17K)
2021-10-08	SELL	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	582.8K	¥3,060	+38.6%	¥1.4B ($9.2M)
2021-10-08	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	1.0M	¥3,060	-38.6%	¥1.3B ($8.3M)
2021-08-04	BUY	Market Buy	ユービーエス・エイ・ジー(銀行) UBS AG	other	627.6K	¥2,146	-12.4%	¥230M ($1.5M)
2021-07-05	BUY	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	520.3K	¥2,376	-20.9%	¥1.2B ($8.0M)
2021-06-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥2,050	+8.3%	¥91M ($587K)
2021-06-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	296.0K	¥2,050	-8.3%	¥597M ($3.9M)

Frequently asked questions

Who has been buying Konoshima Chemical Co.,Ltd. stock?: 4 distinct investors have filed 11 disclosed large-shareholding filings in Konoshima Chemical Co.,Ltd. (4026), most recently on 2025-05-08. 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 Konoshima Chemical Co.,Ltd. have?: Konoshima Chemical Co.,Ltd. has 11 buy-side and 13 sell-side disclosures on record, covering ¥1.7B ($10.9M) in total reported value, spanning 2021-06-22 to 2025-05-08.
Where does StockDrifts get Konoshima 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 Konoshima Chemical Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.