Who has been buying Giken Ltd. stock?

12 distinct investors have filed 67 disclosed large-shareholding filings in Giken Ltd. (6289), most recently on 2026-05-13. 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 Giken Ltd. have?

Giken Ltd. has 67 buy-side and 30 sell-side disclosures on record, covering ¥109.9B ($709.1M) in total reported value, spanning 2021-04-02 to 2026-05-13.

Where does StockDrifts get Giken 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.

Giken Ltd. 6289

Company

株式会社技研製作所Giken Ltd.

Investors

Buys

Total Value

¥109.9B ($709.1M)

Avg Return

-36.60%

Last Filing

2026-05-13

Giken Ltd. (6289) has 67 disclosed large-shareholding filings and 30 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥109.9B ($709.1M) in reported transaction value. The earliest filing StockDrifts holds for Giken Ltd. is dated 2021-04-02; the most recent is 2026-05-13. 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 -36.60%, 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
2026-07-16	BUY	Market Buy	北村博美	strategic	649.4K	¥1,885	+3.2%	¥49M ($316K)
2026-07-16	BUY	Market Buy	有限会社北村興産	strategic	6.0M	¥1,885	+3.2%	¥460M ($3.0M)
2026-07-16	BUY	Market Buy	北村精男	strategic	351.8K	¥1,885	+3.2%	¥24M ($158K)
2026-05-13	BUY	unknown	北村博美	strategic	649.4K	¥1,801	-2.2%	¥1.2B ($7.5M)
2026-05-13	BUY	unknown	有限会社北村興産	strategic	6.0M	¥1,801	-2.2%	¥10.8B ($69.7M)
2026-05-13	BUY	unknown	北村精男	strategic	351.8K	¥1,801	-2.2%	¥634M ($4.1M)
2026-01-13	BUY	Market Buy	北村知佐子	strategic	648.4K	¥2,132	-11.5%	¥1.2B ($7.9M)
2026-01-13	BUY	Market Buy	有限会社北村興産	strategic	6.0M	¥2,132	-11.5%	¥11.3B ($73.1M)
2026-01-13	BUY	Market Buy	北村精男	strategic	351.8K	¥2,132	-11.5%	¥664M ($4.3M)
2025-07-01	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,425	+32.4%	¥924M ($6.0M)
2025-07-01	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,425	+32.4%	¥8.6B ($55.2M)
2025-07-01	BUY	unknown	北村精男 Akio Kitamura	strategic	348.3K	¥1,425	+32.4%	¥496M ($3.2M)
2025-04-10	BUY	Market Buy	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,299	+45.3%	¥842M ($5.4M)
2025-04-10	BUY	Market Buy	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,299	+45.3%	¥7.8B ($50.3M)
2025-04-10	BUY	Market Buy	北村精男 Akio Kitamura	strategic	348.3K	¥1,299	+45.3%	¥4M ($24K)
2025-04-04	BUY	Market Buy	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,276	+47.9%	¥827M ($5.3M)
2025-04-04	BUY	Market Buy	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,276	+47.9%	¥7.7B ($49.4M)
2025-04-04	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,276	+47.9%	¥827M ($5.3M)
2025-04-04	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,276	+47.9%	¥7.7B ($49.4M)
2025-04-04	BUY	unknown	北村精男 Akio Kitamura	strategic	348.3K	¥1,276	+47.9%	¥444M ($2.9M)
2025-04-04	BUY	Market Buy	北村精男 Akio Kitamura	strategic	348.3K	¥1,276	+47.9%	¥4M ($23K)
2025-02-10	BUY	unknown	北村精男 Akio Kitamura	strategic	346.3K	¥1,471	+28.3%	¥509M ($3.3M)
2025-02-10	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,471	+28.3%	¥954M ($6.2M)
2025-02-10	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,471	+28.3%	¥8.8B ($57.0M)
2024-08-07	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	947.1K	¥1,578	-19.6%	¥311M ($2.0M)
2024-08-07	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	335.0K	¥1,578	+19.6%	¥102M ($660K)
2024-08-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.9K	¥1,578	+19.6%	¥445M ($2.9M)
2024-06-03	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,856	+1.7%	¥1.2B ($7.8M)
2024-06-03	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,856	+1.7%	¥11.1B ($71.9M)
2024-06-03	BUY	unknown	北村精男 Akio Kitamura	strategic	346.3K	¥1,856	+1.7%	¥643M ($4.1M)
2024-05-31	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥1,884	+0.2%	¥36M ($233K)
2024-05-31	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥1,884	+0.2%	¥362M ($2.3M)
2024-05-31	BUY	unknown	北村精男 Akio Kitamura	strategic	861.4K	¥1,884	+0.2%	¥52M ($333K)
2023-12-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.1M	¥1,776	+6.3%	¥2.0B ($13.1M)
2023-12-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	270.8K	¥1,776	+6.3%	¥481M ($3.1M)
2023-12-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.0K	¥1,776	+6.3%	¥2M ($11K)
2023-05-09	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	263.9K	¥2,137	-11.7%	¥66M ($428K)
2023-05-09	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	608.3K	¥2,137	-11.7%	¥1.3B ($8.2M)
2023-04-04	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	945.9K	¥2,796	-32.5%	¥2.6B ($16.9M)
2023-04-04	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	9.2K	¥2,796	-32.5%	¥2.3B ($14.9M)
2023-03-10	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥2,786	-32.3%	¥1.8B ($11.7M)
2023-03-10	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	948.3K	¥2,786	-32.3%	¥2.6B ($17.0M)
2023-03-10	BUY	unknown	北村知佐子 Chisako Kitamura	strategic	648.4K	¥2,786	-32.3%	¥1.8B ($11.7M)
2023-03-10	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥2,786	-32.3%	¥16.7B ($107.9M)
2023-03-10	BUY	unknown	有限会社北村興産 Kitamura Kosan Ltd.	strategic	6.0M	¥2,786	-32.3%	¥16.7B ($107.9M)
2023-03-10	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.3M	¥2,786	-32.3%	¥6.3B ($40.5M)
2023-03-10	BUY	unknown	北村精男 Akio Kitamura	strategic	346.3K	¥2,786	-32.3%	¥965M ($6.2M)
2023-03-10	BUY	unknown	北村精男 Akio Kitamura	strategic	346.3K	¥2,786	-32.3%	¥965M ($6.2M)
2023-03-03	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	947.8K	¥2,801	-32.6%	¥2.6B ($16.9M)
2023-03-03	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	400	¥2,801	+32.6%	¥62M ($401K)

Showing the 50 most recent of 200 filings.

Frequently asked questions

Who has been buying Giken Ltd. stock?: 12 distinct investors have filed 67 disclosed large-shareholding filings in Giken Ltd. (6289), most recently on 2026-05-13. 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 Giken Ltd. have?: Giken Ltd. has 67 buy-side and 30 sell-side disclosures on record, covering ¥109.9B ($709.1M) in total reported value, spanning 2021-04-02 to 2026-05-13.
Where does StockDrifts get Giken 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 Giken Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.