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

9 distinct investors have filed 12 disclosed large-shareholding filings in Stamen Co.,Ltd. (4019), most recently on 2026-03-12. 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 Stamen Co.,Ltd. have?

Stamen Co.,Ltd. has 12 buy-side and 51 sell-side disclosures on record, covering ¥1.7B ($10.8M) in total reported value, spanning 2021-03-18 to 2026-03-12.

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.

Stamen Co.,Ltd. 4019

Company

株式会社スタメンStamen Co.,Ltd.

Investors

Buys

Total Value

¥1.7B ($10.8M)

Avg Return

+1.76%

Last Filing

2026-03-12

Stamen Co.,Ltd. (4019) has 12 disclosed large-shareholding filings and 51 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥1.7B ($10.8M) in reported transaction value. The earliest filing StockDrifts holds for Stamen Co.,Ltd. is dated 2021-03-18; the most recent is 2026-03-12. Across these filings the average return since disclosure is +1.76%, 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
2026-08-24	SELL	unknown	株式会社スターフロンツ	strategic	0	¥628	+0.3%	¥74M ($477K)
2026-08-24	BUY	unknown	加藤厚史	strategic	1.2M	¥628	-	-
2026-08-24	BUY	unknown	株式会社YMS	strategic	200.0K	¥628	-	-
2026-08-24	BUY	unknown	株式会社JOM	strategic	200.0K	¥628	-	-
2026-06-12	BUY	unknown	株式会社JOM	strategic	200.0K	¥564	-	-
2026-06-12	SELL	unknown	株式会社スターフロンツ	strategic	118.1K	¥564	-11.0%	¥50M ($320K)
2026-06-12	SELL	unknown	加藤厚史	strategic	1.2M	¥564	-11.0%	¥495K ($3K)
2026-06-12	BUY	unknown	株式会社YMS	strategic	200.0K	¥564	-	-
2026-03-12	SELL	unknown	株式会社スターフロンツ	strategic	205.6K	¥637	+1.7%	¥63M ($404K)
2026-03-12	BUY	unknown	株式会社YMS	strategic	200.0K	¥637	-	-
2026-03-12	BUY	unknown	株式会社JOM	strategic	200.0K	¥637	-	-
2026-03-12	SELL	unknown	加藤厚史	strategic	1.2M	¥637	+1.7%	¥559K ($4K)
2026-03-09	SELL	Market Buy	ヴォイチェフヤクブポドバス(Wojciech Jakub Podobas) Wojciech Jakub Podobas	passive	280.0K	¥618	-1.3%	¥124M ($798K)
2026-03-06	SELL	Market Buy	ヴォイチェフヤクブポドバス(Wojciech Jakub Podobas) Wojciech Jakub Podobas	passive	480.0K	¥651	+3.8%	¥146M ($944K)
2026-03-04	SELL	unknown	加藤厚史	strategic	1.2M	¥580	-7.9%	¥509K ($3K)
2026-03-04	BUY	unknown	株式会社YMS	strategic	200.0K	¥580	-	-
2026-03-04	BUY	unknown	株式会社JOM	strategic	200.0K	¥580	-	-
2026-03-04	SELL	unknown	株式会社スターフロンツ	strategic	303.7K	¥580	-7.9%	¥7M ($43K)
2026-02-27	SELL	unknown	株式会社スターフロンツ	strategic	315.1K	¥660	+5.2%	¥59M ($378K)
2026-02-27	BUY	unknown	株式会社YMS	strategic	200.0K	¥660	-	-
2026-02-27	BUY	unknown	株式会社JOM	strategic	200.0K	¥660	-	-
2026-02-27	SELL	unknown	加藤厚史	strategic	1.2M	¥660	+5.2%	¥580K ($4K)
2026-01-30	SELL	unknown	大西泰平 Taihei Onishi	activist	1.7M	¥735	+14.8%	¥5M ($33K)
2025-11-26	BUY	unknown	株式会社YMS	strategic	200.0K	¥914	-	-
2025-11-26	BUY	unknown	株式会社JOM	strategic	200.0K	¥914	-	-
2025-11-26	SELL	unknown	加藤厚史	strategic	1.2M	¥914	+31.5%	¥802K ($5K)
2025-11-26	SELL	unknown	株式会社スターフロンツ	strategic	403.3K	¥914	+31.5%	¥82M ($528K)
2025-08-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	492.9K	¥1,435	+56.4%	¥153M ($990K)
2025-08-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	492.9K	¥1,435	+56.4%	¥153M ($990K)
2025-08-21	SELL	unknown	加藤厚史 Atsushi Kato	strategic	1.2M	¥1,435	+56.4%	¥116M ($747K)
2025-08-21	BUY	unknown	加藤厚史 Atsushi Kato	strategic	1.2M	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社JOM JOM Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	600.0K	¥1,435	+56.4%	¥1M ($8K)
2025-08-21	BUY	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社JOM JOM Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	加藤厚史 Atsushi Kato	strategic	1.2M	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社JOM JOM Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	600.0K	¥1,435	+56.4%	¥1M ($8K)
2025-08-21	BUY	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社JOM JOM Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	BUY	unknown	加藤厚史 Atsushi Kato	strategic	1.2M	¥1,435	-	-
2025-08-21	BUY	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	492.9K	¥1,435	+56.4%	¥153M ($990K)
2025-08-21	BUY	unknown	株式会社JOM JOM Co., Ltd.	strategic	200.0K	¥1,435	-	-
2025-08-21	SELL	unknown	加藤厚史 Atsushi Kato	strategic	1.2M	¥1,435	+56.4%	¥116M ($747K)
2025-05-21	SELL	unknown	株式会社YMS YMS Co., Ltd.	strategic	200.0K	¥956	+34.5%	¥838K ($5K)
2025-05-21	SELL	unknown	加藤厚史 Atsushi Kato	strategic	1.3M	¥956	+34.5%	¥77M ($497K)
2025-05-21	SELL	unknown	株式会社スターフロンツ star fronts ,inc	strategic	600.0K	¥956	+34.5%	¥838K ($5K)

Showing the 50 most recent of 116 filings.

Frequently asked questions

Who has been buying Stamen Co.,Ltd. stock?: 9 distinct investors have filed 12 disclosed large-shareholding filings in Stamen Co.,Ltd. (4019), most recently on 2026-03-12. 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 Stamen Co.,Ltd. have?: Stamen Co.,Ltd. has 12 buy-side and 51 sell-side disclosures on record, covering ¥1.7B ($10.8M) in total reported value, spanning 2021-03-18 to 2026-03-12.
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.