Who has been buying Nihon Seikan k.k. stock?

2 distinct investors have filed 7 disclosed large-shareholding filings in Nihon Seikan k.k. (5905), most recently on 2026-04-08. 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 Nihon Seikan k.k. have?

Nihon Seikan k.k. has 7 buy-side and 0 sell-side disclosures on record, covering ¥44M ($285K) in total reported value, spanning 2021-12-17 to 2026-04-08.

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.

Nihon Seikan k.k. 5905

Company

日本製罐株式会社Nihon Seikan k.k.

Investors

Buys

Total Value

¥44M ($285K)

Avg Return

-5.74%

Last Filing

2026-04-08

Nihon Seikan k.k. (5905) has 7 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥44M ($285K) in reported transaction value. The earliest filing StockDrifts holds for Nihon Seikan k.k. is dated 2021-12-17; the most recent is 2026-04-08. Across these filings the average return since disclosure is -5.74%, 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
2026-09-08	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	162.3K	¥1,361	+0.0%	¥20M ($131K)
2026-07-28	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	147.4K	¥1,380	-1.4%	¥20M ($129K)
2026-04-08	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	133.0K	¥1,304	+4.4%	¥19M ($125K)
2026-01-15	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	118.1K	¥1,253	+8.6%	¥18M ($117K)
2025-07-29	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	103.5K	¥1,375	-1.0%	¥27M ($173K)
2024-11-15	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	84.1K	¥1,331	+2.3%	¥19M ($121K)
2024-05-14	BUY	Market Buy	株式会社みみっく mimic Co., Ltd.	passive	70.0K	¥1,582	-14.0%	¥111M ($714K)
2023-08-16	BUY	block_purchase	日罐取引先持株会理事長茂木孝之 NIKKANTORIHIKISAKIMOCHIKABUKAI RIJICHOU MOGITAKAYUKI	strategic	84.4K	¥1,730	-21.3%	¥25M ($160K)
2021-12-17	BUY	unknown	日罐取引先持株会理事長茂木孝之 NIKKANTORIHIKISAKIMOCHIKABUKAI RIJICHOU MOGITAKAYUKI	strategic	70.0K	¥1,220	+11.6%	¥85M ($551K)

Frequently asked questions

Who has been buying Nihon Seikan k.k. stock?: 2 distinct investors have filed 7 disclosed large-shareholding filings in Nihon Seikan k.k. (5905), most recently on 2026-04-08. 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 Nihon Seikan k.k. have?: Nihon Seikan k.k. has 7 buy-side and 0 sell-side disclosures on record, covering ¥44M ($285K) in total reported value, spanning 2021-12-17 to 2026-04-08.
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.