Who has been buying Tokyo Sangyo Co., Ltd. stock?

9 distinct investors have filed 9 disclosed large-shareholding filings in Tokyo Sangyo Co., Ltd. (8070), most recently on 2025-09-29. 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 Tokyo Sangyo Co., Ltd. have?

Tokyo Sangyo Co., Ltd. has 9 buy-side and 11 sell-side disclosures on record, covering ¥8.1B ($52.5M) in total reported value, spanning 2021-07-09 to 2025-09-29.

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.

Tokyo Sangyo Co., Ltd. 8070

Company

東京産業株式会社Tokyo Sangyo Co., Ltd.

Investors

Buys

Total Value

¥8.1B ($52.5M)

Avg Return

+29.35%

Last Filing

2025-09-29

Tokyo Sangyo Co., Ltd. (8070) has 9 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥8.1B ($52.5M) in reported transaction value. The earliest filing StockDrifts holds for Tokyo Sangyo Co., Ltd. is dated 2021-07-09; the most recent is 2025-09-29. Across these filings the average return since disclosure is +29.35%, 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
2026-09-14	BUY	Market Buy	西華産業株式会社 SEIKA CORPORATION	other	3.9M	¥986	+3.6%	¥300M ($1.9M)
2026-08-28	BUY	unknown	西華産業株式会社 SEIKA CORPORATION	other	3.6M	¥959	-	¥278M ($1.8M)
2026-08-28	BUY	Market Buy	西華産業株式会社 SEIKA CORPORATION	other	3.6M	¥959	+6.6%	¥278M ($1.8M)
2026-08-18	BUY	unknown	西華産業株式会社 SEIKA CORPORATION	other	3.3M	¥948	-	-
2025-09-29	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥918	-11.3%	¥211M ($1.4M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥918	-	-
2025-04-08	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	0	¥657	-55.6%	¥2.1B ($13.8M)
2025-04-02	BUY	unknown	西華産業株式会社 Seika Corporation	other	3.3M	¥716	+42.7%	¥2.4B ($15.3M)
2024-04-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥666	-	-
2024-04-04	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.3M	¥666	-53.5%	¥210M ($1.4M)
2024-03-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥726	-	-
2024-03-12	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.7M	¥726	-40.8%	¥227M ($1.5M)
2024-03-12	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	unknown	0	¥726	-40.8%	¥208M ($1.3M)
2024-01-25	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥751	-	-
2024-01-25	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	2.5K	¥751	-36.1%	¥17M ($111K)
2024-01-25	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	2.0M	¥751	+36.1%	¥34M ($222K)
2023-08-31	SELL	unknown	三菱重工業株式会社 Mitsubishi Heavy Industries, Ltd.	other	2.5M	¥838	-22.0%	¥1.2B ($7.8M)
2022-01-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.9M	¥770	-	-
2022-01-18	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	310.8K	¥770	-	¥239M ($1.5M)
2022-01-18	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥770	-32.7%	¥238M ($1.5M)
2021-12-16	BUY	unknown	三菱パワー株式会社 Mitsubishi Power, Ltd.	other	3.9M	¥792	-	-
2021-12-16	BUY	unknown	三菱重工業株式会社 Mitsubishi Heavy Industries, Ltd.	other	3.9M	¥792	+29.0%	¥3.1B ($20.0M)
2021-12-16	SELL	unknown	三菱パワー株式会社 Mitsubishi Power, Ltd.	unknown	0	¥792	-29.0%	¥3.1B ($20.0M)
2021-11-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.9M	¥744	+37.4%	¥124M ($798K)
2021-11-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.4M	¥744	-	-
2021-07-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.4M	¥706	-	-
2021-07-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.8M	¥706	+44.8%	¥559M ($3.6M)
2021-07-28	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.4M	¥711	-	-
2021-07-28	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	963.3K	¥711	+43.7%	¥251M ($1.6M)
2021-07-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.4M	¥654	-	-
2021-07-21	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	611.7K	¥654	+56.3%	¥201M ($1.3M)
2021-07-20	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	304.4K	¥655	-	¥199M ($1.3M)
2021-07-20	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.4M	¥655	+56.0%	¥85M ($545K)
2021-07-19	SELL	unknown	三菱商事株式会社 Mitsubishi Corporation	strategic	502.0K	¥636	-60.7%	¥2.1B ($13.7M)
2021-07-13	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.3M	¥622	+64.3%	¥1.4B ($9.0M)
2021-07-09	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	3.3M	¥643	-58.9%	¥481M ($3.1M)

Frequently asked questions

Who has been buying Tokyo Sangyo Co., Ltd. stock?: 9 distinct investors have filed 9 disclosed large-shareholding filings in Tokyo Sangyo Co., Ltd. (8070), most recently on 2025-09-29. 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 Tokyo Sangyo Co., Ltd. have?: Tokyo Sangyo Co., Ltd. has 9 buy-side and 11 sell-side disclosures on record, covering ¥8.1B ($52.5M) in total reported value, spanning 2021-07-09 to 2025-09-29.
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.