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

7 distinct investors have filed 9 disclosed large-shareholding filings in Platz Co., Ltd. (7813), most recently on 2025-12-11. 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 Platz Co., Ltd. have?

Platz Co., Ltd. has 9 buy-side and 10 sell-side disclosures on record, covering ¥1.5B ($9.4M) in total reported value, spanning 2021-03-18 to 2025-12-11.

Where does StockDrifts get Platz 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.

Platz Co., Ltd. 7813

Company

株式会社プラッツPlatz Co., Ltd.

Investors

Buys

Total Value

¥1.5B ($9.4M)

Avg Return

-15.91%

Last Filing

2025-12-11

Platz Co., Ltd. (7813) has 9 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥1.5B ($9.4M) in reported transaction value. The earliest filing StockDrifts holds for Platz Co., Ltd. is dated 2021-03-18; the most recent is 2025-12-11. 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 -15.91%, 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
2025-12-11	BUY	Market Buy	株式会社CARPE DIEM CARPE DIEM CORPORATION	activist	228.4K	¥810	+3.1%	¥34M ($216K)
2025-12-11	BUY	Market Buy	株式会社CARPE DIEM CARPE DIEM CORPORATION	activist	228.4K	¥810	+3.1%	¥185M ($1.2M)
2025-11-12	BUY	Market Buy	株式会社CARPE DIEM CARPE DIEM CORPORATION	activist	187.1K	¥830	+0.6%	¥155M ($1.0M)
2025-05-21	SELL	unknown	福山恵美子 Emiko Fukuyama	strategic	85.0K	¥744	-12.2%	¥132M ($851K)
2025-05-21	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥744	+12.2%	¥410M ($2.6M)
2025-05-21	SELL	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥744	-12.2%	¥5M ($34K)
2025-05-21	SELL	unknown	株式会社EKS EKS Co., Ltd.	strategic	400.0K	¥744	-12.2%	¥8M ($50K)
2025-05-21	SELL	unknown	福山明利 AKITOSHI FUKUYAMA	other	430.0K	¥744	-12.2%	¥33M ($215K)
2025-05-21	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥744	+12.2%	¥80M ($518K)
2025-02-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	170.1K	¥629	+32.8%	¥106M ($684K)
2025-02-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥629	-32.8%	¥111M ($717K)
2024-07-05	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	170.5K	¥742	+12.5%	¥127M ($816K)
2024-07-05	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	176.5K	¥742	+12.5%	¥131M ($845K)
2024-04-02	BUY	negotiated	ベトナムプレシジョンインダストリアルカンパニーリミテッド VIETNAM PRECISION INDUSTRIAL Co ., LTD.,	strategic	284.4K	¥692	+20.7%	¥197M ($1.3M)
2024-03-26	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥677	+23.3%	¥178M ($1.1M)
2024-03-26	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥677	+23.3%	¥373M ($2.4M)
2024-03-26	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥677	+23.3%	¥178M ($1.1M)
2024-03-26	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥677	+23.3%	¥373M ($2.4M)
2024-03-26	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥677	+23.3%	¥73M ($472K)
2024-03-26	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥677	+23.3%	¥73M ($472K)
2024-03-26	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥677	+23.3%	¥373M ($2.4M)
2024-03-26	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥677	+23.3%	¥178M ($1.1M)
2024-03-26	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥677	+23.3%	¥73M ($472K)
2024-03-25	BUY	unknown	株式会社EKS EKS Co., Ltd.	unknown	551.3K	¥675	+23.7%	¥372M ($2.4M)
2024-03-25	BUY	unknown	株式会社EKS EKS Co., Ltd.	unknown	551.3K	¥675	+23.7%	¥372M ($2.4M)
2024-03-25	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥675	+23.7%	¥73M ($470K)
2024-03-25	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥675	+23.7%	¥73M ($470K)
2021-10-05	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,212	-31.1%	¥318M ($2.1M)
2021-10-05	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,212	-31.1%	¥668M ($4.3M)
2021-10-05	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,212	-31.1%	¥318M ($2.1M)
2021-10-05	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,212	-31.1%	¥668M ($4.3M)
2021-10-05	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥1,212	-31.1%	¥131M ($844K)
2021-10-05	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥1,212	-31.1%	¥131M ($844K)
2021-06-22	SELL	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥1,692	+50.6%	¥256M ($1.7M)
2021-06-22	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,692	-50.6%	¥444M ($2.9M)
2021-06-22	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,692	-50.6%	¥256M ($1.7M)
2021-06-22	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,692	-50.6%	¥444M ($2.9M)
2021-06-22	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,692	-50.6%	¥256M ($1.7M)
2021-06-22	SELL	unknown	福山明利 AKITOSHI FUKUYAMA	other	108.0K	¥1,692	+50.6%	¥256M ($1.7M)
2021-05-28	BUY	unknown	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,729	-51.7%	¥454M ($2.9M)
2021-05-28	SELL	unknown	福山明利 AKITOSHI FUKUYAMA	strategic	108.0K	¥1,729	+51.7%	¥262M ($1.7M)
2021-05-28	SELL	Market Buy	福山明利 AKITOSHI FUKUYAMA	strategic	108.0K	¥1,729	+51.7%	¥262M ($1.7M)
2021-05-28	BUY	Market Buy	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,729	-51.7%	¥262M ($1.7M)
2021-05-28	BUY	unknown	株式会社EKS EKS Co., Ltd.	strategic	551.3K	¥1,729	-51.7%	¥262M ($1.7M)
2021-05-28	BUY	Market Buy	福山恵美子 Emiko Fukuyama	strategic	262.4K	¥1,729	-51.7%	¥454M ($2.9M)
2021-03-18	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	259.3K	¥1,396.963	-40.2%	¥238M ($1.5M)
2021-03-18	SELL	unknown	福山明利 AKITOSHI FUKUYAMA	other	259.3K	¥1,396.963	+40.2%	¥301M ($1.9M)
2021-03-18	BUY	unknown	福山明利 AKITOSHI FUKUYAMA	other	259.3K	¥1,396.963	-40.2%	¥301M ($1.9M)

Frequently asked questions

Who has been buying Platz Co., Ltd. stock?: 7 distinct investors have filed 9 disclosed large-shareholding filings in Platz Co., Ltd. (7813), most recently on 2025-12-11. 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 Platz Co., Ltd. have?: Platz Co., Ltd. has 9 buy-side and 10 sell-side disclosures on record, covering ¥1.5B ($9.4M) in total reported value, spanning 2021-03-18 to 2025-12-11.
Where does StockDrifts get Platz 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 Platz Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.