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

5 distinct investors have filed 7 disclosed large-shareholding filings in Yamazaki Co., Ltd. (6147), most recently on 2026-04-10. 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 Yamazaki Co., Ltd. have?

Yamazaki Co., Ltd. has 7 buy-side and 5 sell-side disclosures on record, covering ¥47M ($304K) in total reported value, spanning 2021-05-31 to 2026-04-10.

Where does StockDrifts get Yamazaki 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.

Yamazaki Co., Ltd. 6147

Company

株式会社ヤマザキYamazaki Co., Ltd.

Investors

Buys

Total Value

¥47M ($304K)

Avg Return

-15.18%

Last Filing

2026-04-10

Yamazaki Co., Ltd. (6147) has 7 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥47M ($304K) in reported transaction value. The earliest filing StockDrifts holds for Yamazaki Co., Ltd. is dated 2021-05-31; the most recent is 2026-04-10. 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 -15.18%, 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
2026-04-10	BUY	Market Buy	共有株式会社	strategic	70.0K	¥301	-11.0%	¥4M ($28K)
2026-04-10	BUY	Market Buy	共通物産株式会社	strategic	231.0K	¥301	-11.0%	¥15M ($97K)
2026-04-10	BUY	unknown	共有株式会社	strategic	55.5K	¥301	-11.0%	¥17M ($108K)
2026-04-10	BUY	unknown	共通物産株式会社	strategic	180.9K	¥301	-11.0%	¥54M ($351K)
2024-05-29	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥321	-10.3%	¥220M ($1.4M)
2024-05-29	SELL	unknown	山﨑好和 Yamazaki Yoshikazu	activist	986.5K	¥321	+10.3%	¥64M ($414K)
2024-05-27	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥323	-10.8%	¥221M ($1.4M)
2024-05-27	BUY	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.2M	¥323	-10.8%	¥383M ($2.5M)
2023-12-13	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥338	-14.8%	¥232M ($1.5M)
2023-12-13	SELL	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.2M	¥338	+14.8%	¥68M ($436K)
2023-06-01	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥413	-30.3%	¥283M ($1.8M)
2023-06-01	SELL	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.4M	¥413	+30.3%	¥83M ($533K)
2023-02-27	BUY	Market Buy	真栄会(ヤマザキ取引先持株会)理事長西村邦夫 kunio nishimura	strategic	420.6K	¥336	-14.3%	¥15M ($99K)
2022-09-30	BUY	Market Buy	真栄会(ヤマザキ取引先持株会)理事長西村邦夫 kunio nishimura	strategic	374.7K	¥359	-19.8%	¥17M ($108K)
2022-06-01	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥365	-21.1%	¥250M ($1.6M)
2022-06-01	SELL	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.6M	¥365	+21.1%	¥73M ($471K)
2022-05-30	BUY	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.8M	¥363	-20.7%	¥648M ($4.2M)
2022-05-30	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥363	-20.7%	¥249M ($1.6M)
2021-08-31	BUY	Market Buy	真栄会(ヤマザキ取引先持株会)理事長西村邦夫 kunio nishimura	strategic	330.0K	¥402	-28.4%	¥20M ($126K)
2021-08-31	BUY	unknown	真栄会(ヤマザキ取引先持株会)理事長西村邦夫 kunio nishimura	strategic	327.9K	¥402	-28.4%	¥19M ($120K)
2021-06-02	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥412	-30.1%	¥282M ($1.8M)
2021-06-02	SELL	unknown	山﨑好和 Yamazaki Yoshikazu	activist	1.8M	¥412	+30.1%	¥82M ($531K)
2021-05-31	BUY	unknown	山﨑好和 Yamazaki Yoshikazu	activist	2.0M	¥415	-30.6%	¥824M ($5.3M)
2021-05-31	BUY	unknown	大同興産株式会社 Daido Kosan Co., Ltd.	passive	685.0K	¥415	-30.6%	¥284M ($1.8M)

Frequently asked questions

Who has been buying Yamazaki Co., Ltd. stock?: 5 distinct investors have filed 7 disclosed large-shareholding filings in Yamazaki Co., Ltd. (6147), most recently on 2026-04-10. 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 Yamazaki Co., Ltd. have?: Yamazaki Co., Ltd. has 7 buy-side and 5 sell-side disclosures on record, covering ¥47M ($304K) in total reported value, spanning 2021-05-31 to 2026-04-10.
Where does StockDrifts get Yamazaki 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 Yamazaki Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.