Who has been buying Shirai Electronics Industrial Co., Ltd. stock?

9 distinct investors have filed 10 disclosed large-shareholding filings in Shirai Electronics Industrial Co., Ltd. (6658), most recently on 2025-03-18. 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 Shirai Electronics Industrial Co., Ltd. have?

Shirai Electronics Industrial Co., Ltd. has 10 buy-side and 35 sell-side disclosures on record, covering ¥2.2B ($14.1M) in total reported value, spanning 2023-10-20 to 2025-03-18.

Where does StockDrifts get Shirai Electronics Industrial 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.

Shirai Electronics Industrial Co., Ltd. 6658

Company

シライ電子工業株式会社Shirai Electronics Industrial Co., Ltd.

Investors

Buys

Total Value

¥2.2B ($14.1M)

Avg Return

+29.55%

Last Filing

2025-03-18

Shirai Electronics Industrial Co., Ltd. (6658) has 10 disclosed large-shareholding filings and 35 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥2.2B ($14.1M) in reported transaction value. The earliest filing StockDrifts holds for Shirai Electronics Industrial Co., Ltd. is dated 2023-10-20; the most recent is 2025-03-18. 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 +29.55%, 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
2025-03-18	BUY	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥620	+12.6%	¥1.3B ($8.1M)
2025-03-18	BUY	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥620	+12.6%	¥235M ($1.5M)
2025-03-18	BUY	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥620	+12.6%	¥235M ($1.5M)
2025-03-18	BUY	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥620	+12.6%	¥235M ($1.5M)
2025-03-18	BUY	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥620	+12.6%	¥1.3B ($8.1M)
2025-03-18	BUY	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥620	+12.6%	¥1.3B ($8.1M)
2024-12-24	SELL	unknown	白井由香 Yuka Shirai	strategic	370.4K	¥560	-24.6%	¥16M ($103K)
2024-12-24	SELL	unknown	白井総 SHIRAI OSAMU	strategic	391.4K	¥560	-24.6%	¥17M ($109K)
2024-12-24	SELL	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥560	-24.6%	¥16M ($103K)
2024-12-24	SELL	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥560	-24.6%	¥87M ($560K)
2024-12-13	BUY	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥566	+23.3%	¥214M ($1.4M)
2024-12-13	BUY	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥566	+23.3%	¥214M ($1.4M)
2024-12-13	BUY	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥566	+23.3%	¥1.1B ($7.4M)
2024-12-13	BUY	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥566	+23.3%	¥1.1B ($7.4M)
2024-12-09	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	148.2K	¥571	+22.2%	¥85M ($546K)
2024-12-09	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	16.1K	¥571	+22.2%	¥9M ($59K)
2024-12-09	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	4.1K	¥571	-22.2%	¥552M ($3.6M)
2024-12-05	SELL	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥573	-21.8%	¥2M ($11K)
2024-12-05	SELL	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥573	-21.8%	¥6M ($39K)
2024-11-20	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.6M	¥576	-21.2%	¥18M ($118K)
2024-11-20	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	148.2K	¥576	-21.2%	¥75M ($483K)
2024-11-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	12.7K	¥576	+21.2%	¥261M ($1.7M)
2024-11-12	SELL	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥555	-25.8%	¥18M ($114K)
2024-11-12	SELL	unknown	白井由香 Yuka Shirai	strategic	370.4K	¥555	-25.8%	¥16M ($102K)
2024-11-12	SELL	unknown	白井総 SHIRAI OSAMU	strategic	391.4K	¥555	-25.8%	¥17M ($108K)
2024-11-12	SELL	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥555	-25.8%	¥16M ($102K)
2024-11-12	SELL	unknown	白井由香 Yuka Shirai	strategic	370.4K	¥555	-25.8%	¥16M ($102K)
2024-11-12	SELL	unknown	白井総 SHIRAI OSAMU	strategic	391.4K	¥555	-25.8%	¥17M ($108K)
2024-11-12	SELL	unknown	白井治夫 Haruo Shirai	strategic	378.5K	¥555	-25.8%	¥16M ($102K)
2024-11-12	SELL	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥555	-25.8%	¥86M ($555K)
2024-11-12	SELL	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥555	-25.8%	¥86M ($555K)
2024-11-12	SELL	unknown	白井商事株式会社 Shiraishoji	strategic	2.0M	¥555	-25.8%	¥92M ($595K)
2024-09-18	BUY	Market Buy	吉田優佐 Yusa Yoshida	passive	80.0K	¥578	+20.8%	¥46M ($298K)
2024-09-18	SELL	Market Buy	白井由香 Yuka Shirai	passive	190.4K	¥578	-20.8%	¥104M ($671K)
2024-09-18	BUY	Market Buy	白井総 SHIRAI OSAMU	passive	391.4K	¥578	+20.8%	¥226M ($1.5M)
2024-09-18	BUY	Market Buy	白井基治 SHIRAI MOTOHARU	passive	80.0K	¥578	+20.8%	¥46M ($298K)
2024-09-17	BUY	Market Buy	吉田優佐 Yusa Yoshida	passive	80.0K	¥571	+22.2%	¥46M ($295K)
2024-09-17	BUY	Market Buy	白井由香 Yuka Shirai	passive	370.4K	¥571	+22.2%	¥211M ($1.4M)
2024-09-17	BUY	Market Buy	白井総 SHIRAI OSAMU	passive	391.4K	¥571	+22.2%	¥223M ($1.4M)
2024-09-17	BUY	Market Buy	白井基治 SHIRAI MOTOHARU	passive	80.0K	¥571	+22.2%	¥46M ($295K)
2024-09-12	SELL	Market Buy	白井由香 Yuka Shirai	passive	370.4K	¥581	-20.1%	¥18M ($113K)
2024-09-12	SELL	Market Buy	白井由香 Yuka Shirai	passive	370.4K	¥581	-20.1%	¥18M ($113K)
2024-09-12	SELL	Market Buy	白井総 SHIRAI OSAMU	passive	391.4K	¥581	-20.1%	¥18M ($119K)
2024-09-12	SELL	Market Buy	白井総 SHIRAI OSAMU	passive	391.4K	¥581	-20.1%	¥18M ($119K)
2024-04-03	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	278.1K	¥547	+27.6%	¥152M ($981K)
2024-04-03	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	7.6K	¥547	+27.6%	¥389M ($2.5M)
2024-04-03	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.6M	¥547	-27.6%	¥136M ($875K)
2024-03-28	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	278.2K	¥574	-21.6%	¥2M ($11K)
2024-03-28	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	45.7K	¥574	+21.6%	¥10M ($67K)
2024-03-28	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.9M	¥574	-21.6%	¥75M ($481K)

Showing the 50 most recent of 70 filings.

Frequently asked questions

Who has been buying Shirai Electronics Industrial Co., Ltd. stock?: 9 distinct investors have filed 10 disclosed large-shareholding filings in Shirai Electronics Industrial Co., Ltd. (6658), most recently on 2025-03-18. 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 Shirai Electronics Industrial Co., Ltd. have?: Shirai Electronics Industrial Co., Ltd. has 10 buy-side and 35 sell-side disclosures on record, covering ¥2.2B ($14.1M) in total reported value, spanning 2023-10-20 to 2025-03-18.
Where does StockDrifts get Shirai Electronics Industrial 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 Shirai Electronics Industrial Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.