Who has been buying The Nihon Seima Co.,Ltd. stock?

9 distinct investors have filed 30 disclosed large-shareholding filings in The Nihon Seima Co.,Ltd. (3306), most recently on 2025-10-06. 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 The Nihon Seima Co.,Ltd. have?

The Nihon Seima Co.,Ltd. has 30 buy-side and 10 sell-side disclosures on record, covering ¥3.7B ($23.6M) in total reported value, spanning 2022-03-28 to 2025-10-06.

Where does StockDrifts get The Nihon Seima 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.

The Nihon Seima Co.,Ltd. 3306

Company

日本製麻株式会社The Nihon Seima Co.,Ltd.

Investors

Buys

Total Value

¥3.7B ($23.6M)

Avg Return

+28.47%

Last Filing

2025-10-06

The Nihon Seima Co.,Ltd. (3306) has 30 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥3.7B ($23.6M) in reported transaction value. The earliest filing StockDrifts holds for The Nihon Seima Co.,Ltd. is dated 2022-03-28; the most recent is 2025-10-06. 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 +28.47%, 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
2025-10-06	BUY	Market Buy	LEOMO Japan株式会社 LEOMO Japan Co., Ltd.	passive	2.0M	¥865	-22.2%	¥1.2B ($7.7M)
2025-10-06	BUY	Market Buy	LEOMO Japan株式会社 LEOMO Japan Co., Ltd.	passive	2.0M	¥865	-22.2%	¥1.2B ($7.7M)
2025-10-06	SELL	Market Buy	リオモインク(LEOMO LEOMO ink (LEOMO	passive	1.1M	¥865	+22.2%	¥884M ($5.7M)
2025-10-06	SELL	Market Buy	リオモインク(LEOMO LEOMO ink (LEOMO	passive	1.1M	¥865	+22.2%	¥1.2B ($7.7M)
2025-05-15	BUY	Market Buy	リオモインク(LEOMO,inc) LEOMO,inc	passive	3.2M	¥512	+31.4%	¥73M ($469K)
2025-04-30	SELL	Market Buy	立川光昭 Mitsuaki Tachikawa	passive	200.0K	¥534	-26.0%	¥107M ($689K)
2025-04-30	SELL	Market Buy	立川光昭 Mitsuaki Tachikawa	passive	400.0K	¥534	-26.0%	¥171M ($1.1M)
2025-04-23	BUY	Market Buy	リオモインク(LEOMO,inc) LEOMO,inc	passive	3.0M	¥544	+23.7%	¥75M ($483K)
2025-04-23	BUY	Market Buy	リオモインク(LEOMO,inc) LEOMO,inc	passive	3.0M	¥544	+23.7%	¥75M ($483K)
2025-01-09	BUY	Market Buy	レオモインク(LEOMO,inc) LEOMO,inc	passive	2.8M	¥568	+18.5%	¥1.6B ($10.1M)
2025-01-09	BUY	Market Buy	レオモインク(LEOMO,inc) LEOMO,inc	passive	2.8M	¥568	+18.5%	¥1.6B ($10.1M)
2024-09-11	SELL	Market Buy	株式会社ハルク HULK inc.,	passive	0	¥606	-11.1%	¥362M ($2.3M)
2024-09-11	BUY	Market Buy	株式会社ハルク HULK inc.,	passive	0	¥606	+11.1%	¥362M ($2.3M)
2024-08-20	BUY	Market Buy	株式会社ハルク HULK inc.,	passive	0	¥574	+17.3%	¥343M ($2.2M)
2024-08-20	BUY	Market Buy	株式会社ハルク HULK inc.,	passive	0	¥574	+17.3%	-
2024-08-20	BUY	Market Buy	立川光昭 Mitsuaki Tachikawa	passive	599.0K	¥574	+17.3%	¥344M ($2.2M)
2024-05-07	BUY	Market Buy	株式会社ハルク HULK inc.,	passive	597.0K	¥623	+8.0%	¥372M ($2.4M)
2024-05-07	SELL	Market Buy	BOND CAPITAL CREATION PTE. LTD.	passive	0	¥623	-8.0%	¥372M ($2.4M)
2024-05-07	BUY	Market Buy	株式会社ハルク HULK inc.,	passive	597.0K	¥623	+8.0%	¥372M ($2.4M)
2023-08-28	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	activist	706.7K	¥886	-24.0%	¥78M ($504K)
2023-08-24	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	activist	618.7K	¥825	-18.4%	¥42M ($268K)
2023-07-10	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	activist	568.4K	¥772	-12.8%	¥53M ($340K)
2023-02-21	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	388.9K	¥814	-17.3%	¥17M ($110K)
2023-02-21	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	activist	500.0K	¥814	-17.3%	¥4M ($29K)
2023-02-14	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	494.4K	¥894	-24.7%	¥45M ($288K)
2023-02-09	SELL	Market Buy	宮森宏和 Hirokazu Miyamori	unknown	0	¥910	+26.0%	¥6M ($37K)
2023-02-09	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	444.4K	¥910	-26.0%	¥70M ($449K)
2023-02-09	BUY	negotiated	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	444.4K	¥910	-26.0%	¥70M ($449K)
2023-02-09	BUY	Market Buy	BOND CAPITAL CREATION PTE. LTD.	passive	597.0K	¥910	-26.0%	¥214M ($1.4M)
2023-02-08	BUY	Market Buy	BOND CAPITAL CREATION PTE. LTD.	passive	362.0K	¥972	-30.8%	¥352M ($2.3M)
2022-12-13	SELL	unknown	トレーディア株式会社 TRADIA CORPORATION	strategic	132.7K	¥872	+22.8%	¥65M ($420K)
2022-12-13	BUY	unknown	トレーディア株式会社 TRADIA CORPORATION	strategic	173.8K	¥872	-22.8%	¥54M ($349K)
2022-12-09	BUY	unknown	トレーディア株式会社 TRADIA CORPORATION	strategic	235.7K	¥819	-17.8%	¥32M ($206K)
2022-12-09	SELL	unknown	トレーディア株式会社 TRADIA CORPORATION	strategic	207.1K	¥819	+17.8%	¥55M ($357K)
2022-12-07	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	368.1K	¥833	-19.2%	¥32M ($207K)
2022-12-07	BUY	Market Buy	宮森宏和 Hirokazu Miyamori	strategic	6.4K	¥833	-19.2%	¥5M ($34K)
2022-12-07	SELL	Market Buy	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	0	¥833	+19.2%	¥11M ($73K)
2022-11-18	BUY	Market Buy	宮森宏和 Hirokazu Miyamori	strategic	6.4K	¥800	-15.9%	¥5M ($33K)
2022-11-18	BUY	Market Buy	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	13.7K	¥800	-15.9%	¥11M ($71K)
2022-11-18	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	329.6K	¥800	-15.9%	¥56M ($364K)
2022-06-23	BUY	Market Buy	宮森宏和 Hirokazu Miyamori	strategic	6.4K	¥376	+79.0%	¥2M ($16K)
2022-06-23	BUY	Market Buy	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	13.7K	¥376	+79.0%	¥5M ($33K)
2022-06-23	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	258.8K	¥376	+79.0%	¥18M ($115K)
2022-06-03	BUY	negotiated	宮森宏和 Hirokazu Miyamori	strategic	6.4K	¥378	+78.0%	¥139K ($896)
2022-06-03	BUY	Market Buy	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	211.4K	¥378	+78.0%	¥14M ($91K)
2022-06-03	BUY	negotiated	株式会社ゴーゴーカレーグループ Gogocurrygroup Co.,Ltd	strategic	211.4K	¥378	+78.0%	¥14M ($91K)
2022-06-03	BUY	negotiated	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	13.7K	¥378	+78.0%	¥5M ($33K)
2022-06-03	BUY	Market Buy	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	13.7K	¥378	+78.0%	¥5M ($33K)
2022-03-28	BUY	negotiated	宮森宏和 Hirokazu Miyamori	strategic	6.0K	¥392	+71.7%	¥2M ($15K)
2022-03-28	BUY	negotiated	株式会社ゴーゴーワールド GoGo World Co., Ltd.	strategic	13.7K	¥392	+71.7%	¥5M ($35K)

Showing the 50 most recent of 57 filings.

Frequently asked questions

Who has been buying The Nihon Seima Co.,Ltd. stock?: 9 distinct investors have filed 30 disclosed large-shareholding filings in The Nihon Seima Co.,Ltd. (3306), most recently on 2025-10-06. 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 The Nihon Seima Co.,Ltd. have?: The Nihon Seima Co.,Ltd. has 30 buy-side and 10 sell-side disclosures on record, covering ¥3.7B ($23.6M) in total reported value, spanning 2022-03-28 to 2025-10-06.
Where does StockDrifts get The Nihon Seima 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 The Nihon Seima Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.