Who has been buying Extreme Co.,Ltd. stock?

4 distinct investors have filed 6 disclosed large-shareholding filings in Extreme Co.,Ltd. (6033), most recently on 2026-02-18. 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 Extreme Co.,Ltd. have?

Extreme Co.,Ltd. has 6 buy-side and 8 sell-side disclosures on record, covering ¥953M ($6.1M) in total reported value, spanning 2021-11-04 to 2026-02-18.

Where does StockDrifts get Extreme 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.

Extreme Co.,Ltd. 6033

Company

株式会社エクストリームExtreme Co.,Ltd.

Investors

Buys

Total Value

¥953M ($6.1M)

Avg Return

+21.44%

Last Filing

2026-02-18

Extreme Co.,Ltd. (6033) has 6 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥953M ($6.1M) in reported transaction value. The earliest filing StockDrifts holds for Extreme Co.,Ltd. is dated 2021-11-04; the most recent is 2026-02-18. 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 +21.44%, 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
2026-02-18	BUY	negotiated	エスエスカンパニー合同会社	strategic	284.8K	¥1,418	+3.5%	¥418M ($2.7M)
2026-02-18	BUY	negotiated	佐藤佳子	strategic	24.0K	¥1,418	-3.5%	¥35M ($227K)
2026-02-18	SELL	negotiated	佐藤昌平	activist	2.2M	¥1,418	-3.5%	¥3.2B ($20.8M)
2025-11-18	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	149.8K	¥1,275	+15.1%	¥173M ($1.1M)
2025-11-18	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥1,275	+15.1%	¥31M ($197K)
2025-11-18	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	149.8K	¥1,275	+15.1%	¥173M ($1.1M)
2025-11-18	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥1,275	+15.1%	¥31M ($197K)
2025-11-18	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	149.8K	¥1,275	+15.1%	¥173M ($1.1M)
2025-11-18	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥1,275	+15.1%	¥31M ($197K)
2025-11-18	SELL	negotiated	佐藤昌平 SHOHEI SATO	activist	2.3M	¥1,275	-15.1%	¥190M ($1.2M)
2025-11-18	SELL	negotiated	佐藤昌平 SHOHEI SATO	activist	2.3M	¥1,275	-15.1%	¥190M ($1.2M)
2025-11-18	SELL	negotiated	佐藤昌平 SHOHEI SATO	activist	2.3M	¥1,275	-15.1%	¥190M ($1.2M)
2023-08-25	SELL	Market Buy	株式会社EPARK EPARK , INC.	passive	241.0K	¥1,341	-9.4%	¥76M ($490K)
2023-04-07	SELL	Market Buy	株式会社EPARK EPARK , INC.	passive	297.2K	¥1,335	-9.9%	¥3M ($19K)
2022-03-30	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	13.8K	¥974	+50.6%	¥13M ($87K)
2022-03-30	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥974	+50.6%	¥23M ($151K)
2022-03-30	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	13.8K	¥974	+50.6%	¥7M ($45K)
2022-03-30	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥974	+50.6%	¥23M ($151K)
2022-03-30	SELL	negotiated	佐藤昌平 SHOHEI SATO	activist	2.5M	¥974	-50.6%	¥197K ($1K)
2022-03-30	BUY	negotiated	佐藤昌平 SHOHEI SATO	activist	2.5M	¥974	+50.6%	¥2.4B ($15.5M)
2021-11-04	BUY	negotiated	エスエスカンパニー合同会社 SS Company LLC	strategic	13.8K	¥1,134	+29.4%	¥8M ($52K)
2021-11-04	BUY	negotiated	佐藤佳子 Yoshiko Sato	strategic	24.0K	¥1,134	+29.4%	¥27M ($176K)
2021-11-04	SELL	negotiated	佐藤昌平 SHOHEI SATO	activist	2.5M	¥1,134	-29.4%	¥230K ($1K)

Frequently asked questions

Who has been buying Extreme Co.,Ltd. stock?: 4 distinct investors have filed 6 disclosed large-shareholding filings in Extreme Co.,Ltd. (6033), most recently on 2026-02-18. 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 Extreme Co.,Ltd. have?: Extreme Co.,Ltd. has 6 buy-side and 8 sell-side disclosures on record, covering ¥953M ($6.1M) in total reported value, spanning 2021-11-04 to 2026-02-18.
Where does StockDrifts get Extreme 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 Extreme Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.