Who has been buying Tomoe Engineering Co., Ltd. stock?

8 distinct investors have filed 12 disclosed large-shareholding filings in Tomoe Engineering Co., Ltd. (6309), most recently on 2025-10-22. 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 Tomoe Engineering Co., Ltd. have?

Tomoe Engineering Co., Ltd. has 12 buy-side and 3 sell-side disclosures on record, covering ¥2.3B ($14.9M) in total reported value, spanning 2021-04-07 to 2025-10-22.

Where does StockDrifts get Tomoe Engineering 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.

Tomoe Engineering Co., Ltd. 6309

Company

巴工業株式会社Tomoe Engineering Co., Ltd.

Investors

Buys

Total Value

¥2.3B ($14.9M)

Avg Return

+88.86%

Last Filing

2025-10-22

Tomoe Engineering Co., Ltd. (6309) has 12 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥2.3B ($14.9M) in reported transaction value. The earliest filing StockDrifts holds for Tomoe Engineering Co., Ltd. is dated 2021-04-07; the most recent is 2025-10-22. 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 +88.86%, 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
2025-10-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	492.3K	¥1,627	+13.5%	¥185M ($1.2M)
2025-10-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	126.0K	¥1,627	+13.5%	¥205M ($1.3M)
2025-10-22	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	768.3K	¥1,627	-13.5%	¥668M ($4.3M)
2025-09-29	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	668.4K	¥1,715	+7.6%	¥1.1B ($7.4M)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	2.0M	¥1,715	+7.6%	¥125M ($804K)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.2M	¥1,715	+7.6%	¥3.8B ($24.8M)
2025-08-22	BUY	unknown	巴工業取引先持株会理事長北川昌邦 Kitagawa Masakuni	strategic	1.2M	¥1,684	+9.6%	¥766M ($4.9M)
2025-08-22	BUY	unknown	巴工業取引先持株会理事長北川昌邦 Kitagawa Masakuni	strategic	1.2M	¥1,684	+9.6%	¥766M ($4.9M)
2024-04-05	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	126.3K	¥1,480	-24.7%	¥157M ($1.0M)
2024-04-05	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	42.0K	¥1,480	+24.7%	¥62M ($401K)
2024-04-05	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	392.8K	¥1,480	+24.7%	¥581M ($3.8M)
2024-03-15	BUY	unknown	巴工業取引先持株会理事長大久保利昭 Okubo Toshiaki	strategic	0	¥1,513.33	+22.0%	¥800M ($5.2M)
2024-03-15	BUY	unknown	巴工業取引先持株会理事長北川昌邦 Kitagawa Masakuni	strategic	566.8K	¥1,513.33	+22.0%	¥858M ($5.5M)
2024-03-15	BUY	unknown	巴工業取引先持株会理事長大久保利昭 Okubo Toshiaki	strategic	0	¥1,513.33	+22.0%	¥800M ($5.2M)
2024-03-15	BUY	unknown	巴工業取引先持株会理事長北川昌邦 Kitagawa Masakuni	strategic	566.8K	¥1,513.33	+22.0%	¥858M ($5.5M)
2023-10-12	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	222.8K	¥996.33	+85.3%	¥222M ($1.4M)
2023-10-12	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	655.0K	¥996.33	+85.3%	¥106M ($684K)
2023-10-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	747.0K	¥996.33	+85.3%	¥744M ($4.8M)
2022-04-19	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	222.8K	¥777.33	+137.5%	¥173M ($1.1M)
2022-04-19	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	548.8K	¥777.33	+137.5%	¥82M ($528K)
2022-04-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	747.0K	¥777.33	+137.5%	¥581M ($3.7M)
2022-01-18	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	222.8K	¥728.33	+153.5%	¥162M ($1.0M)
2022-01-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	443.2K	¥728.33	+153.5%	¥25M ($158K)
2022-01-18	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	747.0K	¥728.33	-153.5%	¥163M ($1.0M)
2021-12-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	409.5K	¥739.33	+149.7%	¥90M ($578K)
2021-12-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	969.8K	¥739.33	+149.7%	¥717M ($4.6M)
2021-11-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	288.5K	¥753.33	+145.1%	¥55M ($353K)
2021-11-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	969.8K	¥753.33	+145.1%	¥731M ($4.7M)
2021-05-11	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	215.6K	¥695.33	+165.5%	¥76M ($491K)
2021-05-11	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	969.8K	¥695.33	+165.5%	¥674M ($4.4M)
2021-04-07	BUY	unknown	巴工業取引先持株会理事長大久保利昭 Okubo Toshiaki	strategic	528.4K	¥723.33	+155.2%	¥382M ($2.5M)

Frequently asked questions

Who has been buying Tomoe Engineering Co., Ltd. stock?: 8 distinct investors have filed 12 disclosed large-shareholding filings in Tomoe Engineering Co., Ltd. (6309), most recently on 2025-10-22. 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 Tomoe Engineering Co., Ltd. have?: Tomoe Engineering Co., Ltd. has 12 buy-side and 3 sell-side disclosures on record, covering ¥2.3B ($14.9M) in total reported value, spanning 2021-04-07 to 2025-10-22.
Where does StockDrifts get Tomoe Engineering 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 Tomoe Engineering Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.