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

6 distinct investors have filed 6 disclosed large-shareholding filings in Tomoegawa Co., Ltd. (3878), most recently on 2026-01-23. 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 Tomoegawa Co., Ltd. have?

Tomoegawa Co., Ltd. has 6 buy-side and 3 sell-side disclosures on record, covering ¥1.4B ($9.0M) in total reported value, spanning 2022-04-01 to 2026-01-23.

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.

Tomoegawa Co., Ltd. 3878

Company

株式会社巴川製紙所Tomoegawa Co., Ltd.

Investors

Buys

Total Value

¥1.4B ($9.0M)

Avg Return

+22.00%

Last Filing

2026-01-23

Tomoegawa Co., Ltd. (3878) has 6 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥1.4B ($9.0M) in reported transaction value. The earliest filing StockDrifts holds for Tomoegawa Co., Ltd. is dated 2022-04-01; the most recent is 2026-01-23. Across these filings the average return since disclosure is +22.00%, 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
2026-01-23	BUY	unknown	巴川コーポレーション取引先持株会理事長三瓶悦男 SANPEI ETSUO	other	520.0K	¥798	+8.5%	¥415M ($2.7M)
2025-08-22	SELL	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	0	¥722	-19.9%	¥240M ($1.5M)
2025-08-22	BUY	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	297.8K	¥722	+19.9%	¥213M ($1.4M)
2024-02-19	BUY	Market Buy	株式会社井上ホールディングス Inoue Holdings Corporation	passive	611.7K	¥814	+6.4%	¥498M ($3.2M)
2023-10-06	SELL	unknown	TOPPANホールディングス株式会社 TOPPAN Holdings Inc.	strategic	1.1M	¥661	-31.0%	¥73M ($471K)
2023-01-11	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	395.9K	¥676	-	-
2023-01-11	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	386.0K	¥676	+28.1%	¥90M ($578K)
2022-08-05	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	254.5K	¥706	+22.7%	¥180M ($1.2M)
2022-08-05	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	395.9K	¥706	+22.7%	¥280M ($1.8M)
2022-04-01	BUY	Market Buy	栄紙業株式会社 SAKAE PAPER CO.LTD.	passive	3.3M	¥844	-	¥136M ($877K)
2022-04-01	SELL	Market Buy	栄紙業株式会社 SAKAE PAPER CO.LTD.	passive	3.3M	¥844	-2.6%	¥136M ($877K)

Frequently asked questions

Who has been buying Tomoegawa Co., Ltd. stock?: 6 distinct investors have filed 6 disclosed large-shareholding filings in Tomoegawa Co., Ltd. (3878), most recently on 2026-01-23. 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 Tomoegawa Co., Ltd. have?: Tomoegawa Co., Ltd. has 6 buy-side and 3 sell-side disclosures on record, covering ¥1.4B ($9.0M) in total reported value, spanning 2022-04-01 to 2026-01-23.
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.