Who has been buying Maruchiyo Yamaokaya Corporation stock?

6 distinct investors have filed 9 disclosed large-shareholding filings in Maruchiyo Yamaokaya Corporation (3399), most recently on 2026-05-12. 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 Maruchiyo Yamaokaya Corporation have?

Maruchiyo Yamaokaya Corporation has 9 buy-side and 12 sell-side disclosures on record, covering ¥635M ($4.1M) in total reported value, spanning 2021-03-31 to 2026-05-12.

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.

Maruchiyo Yamaokaya Corporation 3399

Company

株式会社丸千代山岡家Maruchiyo Yamaokaya Corporation

Investors

Buys

Total Value

¥635M ($4.1M)

Avg Return

+29.52%

Last Filing

2026-05-12

Maruchiyo Yamaokaya Corporation (3399) has 9 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥635M ($4.1M) in reported transaction value. The earliest filing StockDrifts holds for Maruchiyo Yamaokaya Corporation is dated 2021-03-31; the most recent is 2026-05-12. Across these filings the average return since disclosure is +29.52%, 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
2026-08-21	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.5M	¥3,830	+2.0%	¥15M ($99K)
2026-08-21	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	123.5K	¥3,830	-	-
2026-08-21	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	84.1K	¥3,830	-	-
2026-08-21	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	61.0K	¥3,830	-	-
2026-08-07	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	123.5K	¥3,580	-	-
2026-08-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.5M	¥3,580	-	-
2026-08-07	SELL	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	61.0K	¥3,580	-4.9%	¥7M ($46K)
2026-08-07	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	84.1K	¥3,580	-	-
2026-07-07	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	123.5K	¥3,400	-	-
2026-07-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.5M	¥3,400	+10.4%	¥342M ($2.2M)
2026-07-07	SELL	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	84.1K	¥3,400	-10.4%	¥109M ($706K)
2026-07-07	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	61.8K	¥3,400	+10.4%	¥14M ($88K)
2026-05-22	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.4M	¥2,957	+27.0%	¥458M ($3.0M)
2026-05-22	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	123.5K	¥2,957	-	-
2026-05-22	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	116.8K	¥2,957	-	-
2026-05-22	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	59.2K	¥2,957	-	-
2026-05-12	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	59.2K	¥2,945	+27.5%	¥41M ($268K)
2026-05-12	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.3M	¥2,945	+27.5%	¥515M ($3.3M)
2026-05-12	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	123.5K	¥2,945	+27.5%	¥101M ($650K)
2026-05-12	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	116.8K	¥2,945	+27.5%	¥101M ($650K)
2026-03-23	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.1M	¥3,480	+7.9%	¥3.8B ($24.6M)
2026-03-23	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	88.8K	¥3,480	+7.9%	¥309M ($2.0M)
2026-03-23	BUY	Market Buy	キャピタル・インターナショナル・インク(Capital International	passive	81.9K	¥3,480	+7.9%	¥285M ($1.8M)
2026-03-23	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	45.2K	¥3,480	+7.9%	¥157M ($1.0M)
2024-03-27	SELL	negotiated	山岡正 tadashi yamaoka	activist	856.0K	¥1,940	-93.6%	¥272M ($1.8M)
2024-03-27	SELL	negotiated	山岡正 tadashi yamaoka	activist	856.0K	¥1,940	-93.6%	¥272M ($1.8M)
2024-03-11	SELL	negotiated	山岡正 tadashi yamaoka	activist	996.0K	¥1,615	-132.5%	¥274M ($1.8M)
2024-02-29	SELL	negotiated	山岡正 tadashi yamaoka	activist	1.2M	¥1,410	-166.3%	¥254M ($1.6M)
2024-02-22	SELL	negotiated	山岡正 tadashi yamaoka	activist	1.3M	¥1,265	-196.8%	¥228M ($1.5M)
2024-01-19	BUY	negotiated	山岡正 Tadashi Yamaoka	activist	1.5M	¥1,337.5	-	-
2024-01-04	SELL	negotiated	山岡正 Tadashi Yamaoka	activist	1.5M	¥1,056.25	-255.5%	¥144M ($932K)
2023-12-22	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	120.5K	¥998.75	-276.0%	¥147M ($949K)
2023-12-08	SELL	negotiated	山岡正 tadashi yamaoka	activist	1.7M	¥702.5	-434.5%	¥115M ($741K)
2023-11-22	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	267.8K	¥815	-360.7%	¥101M ($653K)
2023-10-20	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	392.1K	¥843.75	+345.0%	¥331M ($2.1M)
2023-10-13	SELL	negotiated	山岡正 tadashi yamaoka	activist	1.8M	¥817.5	-359.3%	¥44M ($281K)
2021-05-13	SELL	negotiated	山岡正 Tadashi Yamaoka	activist	923.0K	¥235.63	-	¥17M ($108K)
2021-03-31	SELL	negotiated	山岡正 Tadashi Yamaoka	activist	994.0K	¥228.013	-	¥11M ($73K)

Frequently asked questions

Who has been buying Maruchiyo Yamaokaya Corporation stock?: 6 distinct investors have filed 9 disclosed large-shareholding filings in Maruchiyo Yamaokaya Corporation (3399), most recently on 2026-05-12. 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 Maruchiyo Yamaokaya Corporation have?: Maruchiyo Yamaokaya Corporation has 9 buy-side and 12 sell-side disclosures on record, covering ¥635M ($4.1M) in total reported value, spanning 2021-03-31 to 2026-05-12.
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.