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

8 distinct investors have filed 20 disclosed large-shareholding filings in Takamiya Co., Ltd. (2445), most recently on 2025-09-24. 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 Takamiya Co., Ltd. have?

Takamiya Co., Ltd. has 20 buy-side and 8 sell-side disclosures on record, covering ¥3.9B ($25.2M) in total reported value, spanning 2021-09-07 to 2025-09-24.

Where does StockDrifts get Takamiya 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.

Takamiya Co., Ltd. 2445

Company

株式会社タカミヤTakamiya Co., Ltd.

Investors

Buys

Total Value

¥3.9B ($25.2M)

Avg Return

-11.58%

Last Filing

2025-09-24

Takamiya Co., Ltd. (2445) has 20 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥3.9B ($25.2M) in reported transaction value. The earliest filing StockDrifts holds for Takamiya Co., Ltd. is dated 2021-09-07; the most recent is 2025-09-24. 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 -11.58%, 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
2025-09-24	BUY	Market Buy	髙宮一雅 Kazumasa Takamiya	activist	1.5M	¥397	+1.0%	¥612M ($3.9M)
2025-09-24	BUY	Market Buy	有限会社タカミヤ Takamiya Co., Ltd.	strategic	9.8M	¥397	+1.0%	¥211M ($1.4M)
2025-09-24	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	9.8M	¥397	+1.0%	¥211M ($1.4M)
2025-09-24	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	1.5M	¥397	+1.0%	¥612M ($3.9M)
2025-09-01	BUY	Market Buy	有限会社タカミヤ Takamiya Co., Ltd.	strategic	9.2M	¥358	+12.0%	¥157M ($1.0M)
2025-09-01	BUY	Market Buy	髙宮一雅 Kazumasa Takamiya	activist	1.5M	¥358	+12.0%	¥17M ($108K)
2024-10-29	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.2M	¥445	-9.9%	¥3.2B ($20.7M)
2024-10-29	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.2M	¥445	-9.9%	¥983M ($6.3M)
2024-10-07	BUY	unknown	株式会社Quattro Quattro Co., Ltd.	strategic	1.0M	¥446	-10.1%	¥446M ($2.9M)
2024-10-07	BUY	unknown	株式会社Casa Casa Inc.	other	479.5K	¥446	-10.1%	¥214M ($1.4M)
2024-10-07	BUY	unknown	髙宮章好 Akiyoshi Takamiya	activist	1.7M	¥446	-10.1%	¥769M ($5.0M)
2024-08-30	SELL	unknown	髙宮一雅 Kazumasa Takamiya	activist	1.5M	¥461	+13.0%	¥421M ($2.7M)
2024-08-30	BUY	unknown	株式会社Quattro Quattro Co., Ltd.	strategic	2.0M	¥461	-13.0%	¥455M ($2.9M)
2024-08-30	BUY	unknown	株式会社Casa Casa Inc.	other	479.5K	¥461	-13.0%	¥221M ($1.4M)
2024-08-30	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	8.8M	¥461	-13.0%	¥430M ($2.8M)
2024-08-30	BUY	unknown	株式会社Quattro Quattro Co., Ltd.	strategic	2.0M	¥461	-13.0%	¥455M ($2.9M)
2024-08-30	BUY	unknown	株式会社Casa Casa Inc.	other	479.5K	¥461	-13.0%	¥221M ($1.4M)
2024-08-30	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	8.8M	¥461	-13.0%	¥430M ($2.8M)
2024-08-30	SELL	unknown	髙宮章好 Akiyoshi Takamiya	activist	857.9K	¥461	+13.0%	¥397M ($2.6M)
2024-08-30	BUY	unknown	株式会社ライズ・エイト RISE EIGHT.co	strategic	4.4M	¥461	-13.0%	¥430M ($2.8M)
2024-08-30	SELL	unknown	髙宮一雅 Kazumasa Takamiya	activist	1.5M	¥461	+13.0%	¥421M ($2.7M)
2024-08-30	SELL	unknown	髙宮章好 Akiyoshi Takamiya	activist	857.9K	¥461	+13.0%	¥397M ($2.6M)
2024-08-30	BUY	Market Buy	株式会社ライズ・エイト RISE EIGHT.co	strategic	4.4M	¥461	-13.0%	¥430M ($2.8M)
2023-09-05	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.9M	¥524	-23.5%	¥100M ($646K)
2023-09-05	BUY	Market Buy	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.9M	¥524	-23.5%	¥100M ($646K)
2023-09-05	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.9M	¥524	-23.5%	¥100M ($646K)
2023-09-05	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.4M	¥524	-23.5%	¥107M ($693K)
2023-09-05	SELL	unknown	髙宮東実 Tojitsu Takamiya	strategic	1.7M	¥524	+23.5%	¥2.1B ($13.8M)
2023-09-05	BUY	Market Buy	髙宮一雅 Kazumasa Takamiya	activist	2.4M	¥524	-23.5%	¥107M ($693K)
2023-09-05	BUY	unknown	株式会社ライズ・エイト RISE EIGHT.co	strategic	3.5M	¥524	-23.5%	¥1.8B ($11.8M)
2023-09-05	BUY	unknown	髙宮東実 Tojitsu Takamiya	strategic	1.7M	¥524	-23.5%	¥2.1B ($13.8M)
2023-09-05	BUY	unknown	株式会社ライズ・エイト RISE EIGHT.co	strategic	3.5M	¥524	-23.5%	¥1.8B ($11.8M)
2023-09-05	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.4M	¥524	-23.5%	¥107M ($693K)
2023-02-17	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.7M	¥416	-3.6%	¥198M ($1.3M)
2023-02-17	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.7M	¥416	-3.6%	¥198M ($1.3M)
2023-02-17	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.2M	¥416	-3.6%	¥919M ($5.9M)
2023-02-17	BUY	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.2M	¥416	-3.6%	¥919M ($5.9M)
2021-12-10	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.2M	¥448	-10.5%	¥209M ($1.3M)
2021-12-10	SELL	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.2M	¥448	+10.5%	¥42M ($269K)
2021-12-10	SELL	unknown	髙宮一雅 Kazumasa Takamiya	activist	2.2M	¥448	+10.5%	¥42M ($269K)
2021-12-10	BUY	unknown	有限会社タカミヤ Takamiya Co., Ltd.	strategic	7.2M	¥448	-10.5%	¥209M ($1.3M)
2021-09-07	SELL	Market Buy	レオス・キャピタルワークス株式会社 RHEOS CAPITAL WORKS Inc.	passive	1.9M	¥481	+16.6%	¥238M ($1.5M)

Frequently asked questions

Who has been buying Takamiya Co., Ltd. stock?: 8 distinct investors have filed 20 disclosed large-shareholding filings in Takamiya Co., Ltd. (2445), most recently on 2025-09-24. 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 Takamiya Co., Ltd. have?: Takamiya Co., Ltd. has 20 buy-side and 8 sell-side disclosures on record, covering ¥3.9B ($25.2M) in total reported value, spanning 2021-09-07 to 2025-09-24.
Where does StockDrifts get Takamiya 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 Takamiya Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.