Who has been buying Yamami Company stock?

13 distinct investors have filed 22 disclosed large-shareholding filings in Yamami Company (2820), most recently on 2025-12-26. 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 Yamami Company have?

Yamami Company has 22 buy-side and 37 sell-side disclosures on record, covering ¥6.9B ($44.6M) in total reported value, spanning 2021-04-06 to 2025-12-26.

Where does StockDrifts get Yamami Company 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.

Yamami Company 2820

Company

株式会社やまみYamami Company

Investors

Buys

Total Value

¥6.9B ($44.6M)

Avg Return

+70.54%

Last Filing

2025-12-26

Yamami Company (2820) has 22 disclosed large-shareholding filings and 37 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥6.9B ($44.6M) in reported transaction value. The earliest filing StockDrifts holds for Yamami Company is dated 2021-04-06; the most recent is 2025-12-26. 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 +70.54%, 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
2026-06-19	SELL	unknown	野村アセットマネジメント株式会社	other	273.4K	¥4,780	-5.4%	¥30M ($193K)
2026-06-19	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	8.5K	¥4,780	-5.4%	¥97M ($623K)
2026-06-19	SELL	unknown	野村證券株式会社	other	4.3K	¥4,780	-5.4%	¥196M ($1.3M)
2025-12-26	BUY	unknown	ゼナーアセットマネジメントエルエルピー(Zennor Asset Management LLP) Zennor Asset Management LLP	activist	449.8K	¥4,700	-7.9%	¥363M ($2.3M)
2025-12-26	BUY	unknown	ゼナーアセットマネジメントエルエルピー(Zennor Asset Management LLP) Zennor Asset Management LLP	activist	449.8K	¥4,700	-7.9%	¥363M ($2.3M)
2025-12-05	SELL	Market Buy	株式会社三井住友銀行	other	0	¥4,150	-4.3%	-
2025-12-05	SELL	Market Buy	三井住友DSアセットマネジメント株式会社	passive	361.6K	¥4,150	-4.3%	¥1.6B ($10.1M)
2025-05-01	BUY	unknown	ゼナーアセットマネジメントエルエルピー(Zennor Asset Management LLP) Zennor Asset Management LLP	activist	372.5K	¥4,615	-6.2%	¥1.7B ($11.1M)
2025-04-22	SELL	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	26.4K	¥4,690	+7.7%	¥75M ($485K)
2025-04-22	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	406.7K	¥4,690	-7.7%	¥389M ($2.5M)
2025-03-07	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	42.4K	¥3,550	+22.0%	¥151M ($971K)
2025-03-07	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	324.1K	¥3,550	+22.0%	¥1.2B ($7.4M)
2025-02-05	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	279.3K	¥3,460	+25.1%	¥966M ($6.2M)
2025-02-05	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	28.5K	¥3,460	+25.1%	¥99M ($636K)
2025-02-05	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	45.0K	¥3,460	+25.1%	¥156M ($1.0M)
2025-01-06	BUY	unknown	やまみホールディングス株式会社 Yamami Holdings Co., Ltd.	strategic	2.4M	¥3,440	+25.9%	¥8.3B ($53.3M)
2025-01-06	BUY	unknown	やまみホールディングス株式会社 Yamami Holdings Co., Ltd.	strategic	2.4M	¥3,440	+25.9%	¥8.3B ($53.3M)
2025-01-06	BUY	unknown	やまみホールディングス株式会社 Yamami Holdings Co., Ltd.	strategic	2.4M	¥3,440	+25.9%	¥8.3B ($53.3M)
2025-01-06	BUY	unknown	山名徹 Yamana Toru	activist	846.9K	¥3,440	+25.9%	¥2.9B ($18.8M)
2025-01-06	BUY	unknown	山名徹 Yamana Toru	activist	846.9K	¥3,440	+25.9%	¥2.9B ($18.8M)
2025-01-06	SELL	unknown	山名徹 Yamana Toru	activist	846.9K	¥3,440	-25.9%	¥326M ($2.1M)
2024-04-11	BUY	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥3,530	+22.7%	¥8.5B ($54.7M)
2024-04-11	SELL	unknown	山名徹 Yamana Toru	activist	846.9K	¥3,530	-22.7%	¥334M ($2.2M)
2024-03-08	BUY	unknown	山名清 Yamana Kiyoshi	activist	92.5K	¥3,580	+20.9%	¥318M ($2.0M)
2024-03-08	SELL	unknown	山名徹 Yamana Toru	activist	942.2K	¥3,580	-20.9%	¥923M ($6.0M)
2024-03-08	BUY	unknown	山名清 Yamana Kiyoshi	activist	92.5K	¥3,580	+20.9%	¥318M ($2.0M)
2024-03-08	SELL	unknown	山名睦子 Mutsuko Yamana	unknown	0	¥3,580	-20.9%	¥329M ($2.1M)
2024-03-08	SELL	unknown	山名睦子 Mutsuko Yamana	unknown	0	¥3,580	-20.9%	¥329M ($2.1M)
2024-03-08	BUY	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥3,580	+20.9%	¥8.6B ($55.5M)
2024-03-08	SELL	unknown	山名睦子 Mutsuko Yamana	strategic	0	¥3,580	-20.9%	¥329M ($2.1M)
2024-03-08	BUY	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥3,580	+20.9%	¥8.6B ($55.5M)
2024-03-08	SELL	unknown	山名徹 Yamana Toru	activist	942.2K	¥3,580	-20.9%	¥923M ($6.0M)
2024-03-08	BUY	unknown	山名清 Yamana Kiyoshi	activist	92.5K	¥3,580	+20.9%	¥318M ($2.0M)
2023-04-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	49.1K	¥1,307	+231.3%	¥64M ($414K)
2023-04-06	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	220.6K	¥1,307	-231.3%	¥87M ($558K)
2023-04-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	17.7K	¥1,307	+231.3%	¥23M ($149K)
2023-03-03	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	49.0K	¥1,363	-217.7%	¥7M ($43K)
2023-03-03	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	17.6K	¥1,363	-217.7%	¥16M ($104K)
2023-03-03	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	287.0K	¥1,363	+217.7%	¥386M ($2.5M)
2023-03-01	SELL	unknown	山名睦子 Mutsuko Yamana	strategic	92.2K	¥1,346	-221.7%	¥329M ($2.1M)
2023-03-01	SELL	unknown	山名睦子 Mutsuko Yamana	strategic	92.2K	¥1,346	-221.7%	¥329M ($2.1M)
2023-03-01	BUY	unknown	山名清 Yamana Kiyoshi	activist	392.5K	¥1,346	+221.7%	¥528M ($3.4M)
2023-03-01	BUY	unknown	山名清 Yamana Kiyoshi	activist	392.5K	¥1,346	+221.7%	¥528M ($3.4M)
2023-03-01	BUY	unknown	山名清 Yamana Kiyoshi	activist	392.5K	¥1,346	+221.7%	¥528M ($3.4M)
2023-03-01	SELL	unknown	山名睦子 Mutsuko Yamana	strategic	92.2K	¥1,346	-221.7%	¥329M ($2.1M)
2022-06-27	SELL	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥1,780	-143.3%	¥397M ($2.6M)
2022-06-27	SELL	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥1,780	-143.3%	¥273M ($1.8M)
2022-06-27	BUY	unknown	株式会社YMコーポレーション YM Corporation Co., Ltd.	strategic	2.4M	¥1,780	+143.3%	¥4.3B ($27.6M)
2022-06-27	BUY	unknown	山名徹 Yamana Toru	activist	1.2M	¥1,780	+143.3%	¥2.1B ($13.8M)
2022-06-27	SELL	unknown	山名徹 Yamana Toru	activist	1.2M	¥1,780	-143.3%	¥198M ($1.3M)

Showing the 50 most recent of 87 filings.

Frequently asked questions

Who has been buying Yamami Company stock?: 13 distinct investors have filed 22 disclosed large-shareholding filings in Yamami Company (2820), most recently on 2025-12-26. 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 Yamami Company have?: Yamami Company has 22 buy-side and 37 sell-side disclosures on record, covering ¥6.9B ($44.6M) in total reported value, spanning 2021-04-06 to 2025-12-26.
Where does StockDrifts get Yamami Company 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 Yamami Company. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.