Who has been buying Berg Earth Co.,Ltd. stock?

4 distinct investors have filed 5 disclosed large-shareholding filings in Berg Earth Co.,Ltd. (1383), most recently on 2025-10-01. 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 Berg Earth Co.,Ltd. have?

Berg Earth Co.,Ltd. has 5 buy-side and 13 sell-side disclosures on record, covering ¥2.0B ($12.6M) in total reported value, spanning 2021-12-03 to 2025-10-01.

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.

Berg Earth Co.,Ltd. 1383

Company

ベルグアース株式会社Berg Earth Co.,Ltd.

Investors

Buys

Total Value

¥2.0B ($12.6M)

Avg Return

+13.61%

Last Filing

2025-10-01

Berg Earth Co.,Ltd. (1383) has 5 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥2.0B ($12.6M) in reported transaction value. The earliest filing StockDrifts holds for Berg Earth Co.,Ltd. is dated 2021-12-03; the most recent is 2025-10-01. Across these filings the average return since disclosure is +13.61%, 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
2026-06-25	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	138.4K	¥2,852	-6.8%	¥71M ($460K)
2025-10-01	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	163.4K	¥3,040	-0.2%	¥63M ($405K)
2025-10-01	BUY	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.3K	¥3,040	+0.2%	¥981K ($6K)
2024-04-18	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	183.8K	¥3,310	+8.0%	¥22M ($144K)
2024-04-18	BUY	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,310	-	-
2024-03-26	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	190.5K	¥3,330	+8.6%	¥57M ($367K)
2024-03-26	BUY	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,330	-	-
2024-03-04	BUY	unknown	松岡馨 kaoru matsuoka	strategic	81.9K	¥3,365	-	¥72M ($465K)
2024-03-04	SELL	unknown	松岡馨 kaoru matsuoka	strategic	81.9K	¥3,365	+9.5%	¥72M ($465K)
2024-03-04	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	207.6K	¥3,365	+9.5%	¥55M ($353K)
2024-03-04	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,365	+9.5%	¥3M ($17K)
2024-02-05	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,365	+9.5%	¥3M ($17K)
2024-02-05	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,365	+9.5%	¥3M ($17K)
2024-02-05	BUY	negotiated	山口一彦 kazuhiko yamaguchi	activist	223.8K	¥3,365	-	-
2024-02-05	BUY	negotiated	山口一彦 kazuhiko yamaguchi	activist	223.8K	¥3,365	-	-
2023-06-27	SELL	negotiated	山口一彦 kazuhiko yamaguchi	activist	223.8K	¥3,075	+1.0%	¥15M ($99K)
2023-06-27	BUY	negotiated	山口一彦 kazuhiko yamaguchi	activist	228.8K	¥3,075	-	-
2023-06-27	BUY	negotiated	山口一彦 kazuhiko yamaguchi	activist	228.8K	¥3,075	-1.0%	¥694M ($4.5M)
2023-06-27	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,075	+1.0%	¥2M ($16K)
2023-06-27	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,075	+1.0%	¥2M ($16K)
2023-06-27	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,075	+1.0%	¥2M ($16K)
2023-06-21	BUY	negotiated	山口一彦 kazuhiko yamaguchi	activist	228.8K	¥3,100	-1.8%	¥678M ($4.4M)
2023-06-21	SELL	negotiated	山口眞由子 Mayuko Yamaguchi	activist	25.0K	¥3,100	+1.8%	¥44M ($284K)
2023-02-15	BUY	Market Buy	アグリビジネス投資育成株式会社 The Agribusiness Investment & Consultation Co., Ltd.	passive	113.6K	¥3,085	-	¥350M ($2.3M)
2023-02-15	BUY	Market Buy	アグリビジネス投資育成株式会社 The Agribusiness Investment & Consultation Co., Ltd.	passive	113.6K	¥3,085	-1.3%	¥350M ($2.3M)
2021-12-03	BUY	unknown	松岡馨 kaoru matsuoka	strategic	92.9K	¥2,485	-	¥231M ($1.5M)
2021-12-03	BUY	unknown	松岡馨 kaoru matsuoka	strategic	92.9K	¥2,485	+22.5%	¥231M ($1.5M)

Frequently asked questions

Who has been buying Berg Earth Co.,Ltd. stock?: 4 distinct investors have filed 5 disclosed large-shareholding filings in Berg Earth Co.,Ltd. (1383), most recently on 2025-10-01. 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 Berg Earth Co.,Ltd. have?: Berg Earth Co.,Ltd. has 5 buy-side and 13 sell-side disclosures on record, covering ¥2.0B ($12.6M) in total reported value, spanning 2021-12-03 to 2025-10-01.
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.