Who has been buying Sanyu Construction Co.,Ltd. stock?

12 distinct investors have filed 10 disclosed large-shareholding filings in Sanyu Construction Co.,Ltd. (1841), most recently on 2026-03-24. 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 Sanyu Construction Co.,Ltd. have?

Sanyu Construction Co.,Ltd. has 10 buy-side and 16 sell-side disclosures on record, covering ¥6.6B ($42.3M) in total reported value, spanning 2021-08-19 to 2026-03-24.

Where does StockDrifts get Sanyu Construction 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.

Sanyu Construction Co.,Ltd. 1841

Company

サンユー建設株式会社Sanyu Construction Co.,Ltd.

Investors

Buys

Total Value

¥6.6B ($42.3M)

Avg Return

+15.91%

Last Filing

2026-03-24

Sanyu Construction Co.,Ltd. (1841) has 10 disclosed large-shareholding filings and 16 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥6.6B ($42.3M) in reported transaction value. The earliest filing StockDrifts holds for Sanyu Construction Co.,Ltd. is dated 2021-08-19; the most recent is 2026-03-24. 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 +15.91%, 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
2026-03-24	SELL	Market Buy	斎藤昌子	unknown	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	斎藤昌子	unknown	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	馬場久恵	unknown	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	馬場宏二郎	unknown	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	SELL	Market Buy	馬場雄一郎	unknown	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	BUY	Market Buy	馬場邦明	unknown	322.0K	¥1,586	+0.3%	¥512M ($3.3M)
2026-03-24	SELL	Market Buy	株式会社インテリア井門	unknown	0	¥1,586	-0.3%	-
2026-03-24	BUY	Market Buy	株式会社井門エンタープライズ	unknown	100.0K	¥1,586	-0.3%	¥159M ($1.0M)
2026-03-24	BUY	Market Buy	株式会社井門コーポレーション	unknown	276.3K	¥1,586	+0.3%	¥439M ($2.8M)
2026-03-24	BUY	Market Buy	株式会社カバロ企画	activist	1.6M	¥1,586	-0.3%	¥2.6B ($16.7M)
2026-03-24	SELL	Market Buy	馬場久恵	unknown	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	馬場宏二郎	unknown	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	SELL	Market Buy	馬場雄一郎	unknown	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	BUY	Market Buy	馬場邦明	unknown	322.0K	¥1,586	+0.3%	¥512M ($3.3M)
2026-03-24	SELL	Market Buy	株式会社インテリア井門	unknown	0	¥1,586	-0.3%	-
2026-03-24	BUY	Market Buy	株式会社井門エンタープライズ	unknown	100.0K	¥1,586	-0.3%	¥159M ($1.0M)
2026-03-24	BUY	Market Buy	株式会社井門コーポレーション	unknown	276.3K	¥1,586	+0.3%	¥439M ($2.8M)
2026-03-24	BUY	Market Buy	株式会社カバロ企画	activist	1.6M	¥1,586	-0.3%	¥2.6B ($16.7M)
2026-03-24	SELL	Market Buy	斎藤昌子	strategic	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	馬場久恵	strategic	0	¥1,586	-0.3%	-
2026-03-24	SELL	Market Buy	馬場宏二郎	activist	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	SELL	Market Buy	馬場雄一郎	activist	1.5K	¥1,586	-0.3%	¥2M ($16K)
2026-03-24	BUY	Market Buy	馬場邦明	other	322.0K	¥1,586	+0.3%	¥512M ($3.3M)
2026-01-06	BUY	Market Buy	株式会社インテリア井門	strategic	17.6K	¥1,584	-0.4%	¥28M ($181K)
2026-01-06	BUY	Market Buy	株式会社井門エンタープライズ	strategic	100.0K	¥1,584	-0.4%	¥159M ($1.0M)
2026-01-06	BUY	Market Buy	株式会社井門コーポレーション	strategic	258.7K	¥1,584	-0.4%	¥411M ($2.7M)
2026-01-05	BUY	Market Buy	馬場雄一郎	unknown	101.3K	¥1,583	-0.4%	¥161M ($1.0M)
2026-01-05	BUY	unknown	斎藤昌子	unknown	4.0K	¥1,583	-0.4%	¥6M ($41K)
2026-01-05	BUY	Market Buy	公益財団法人ホース未来福祉財団 Horse F.W.F	other	2.0M	¥1,583	+0.4%	¥2.4B ($15.6M)
2026-01-05	BUY	unknown	馬場久恵	unknown	12.0K	¥1,583	-0.4%	¥19M ($123K)
2026-01-05	BUY	unknown	馬場宏二郎	unknown	96.4K	¥1,583	-0.4%	¥153M ($989K)
2026-01-05	BUY	unknown	馬場雄一郎	unknown	101.3K	¥1,583	-0.4%	¥161M ($1.0M)
2026-01-05	BUY	unknown	馬場邦明	unknown	111.3K	¥1,583	-0.4%	¥177M ($1.1M)
2026-01-05	BUY	unknown	株式会社インテリア井門	unknown	17.6K	¥1,583	-0.4%	¥28M ($181K)
2026-01-05	BUY	unknown	株式会社井門エンタープライズ	unknown	100.0K	¥1,583	-0.4%	¥159M ($1.0M)
2026-01-05	BUY	unknown	株式会社井門コーポレーション	unknown	258.7K	¥1,583	-0.4%	¥411M ($2.7M)
2026-01-05	BUY	unknown	株式会社カバロ企画	activist	1.6M	¥1,583	-0.4%	¥2.6B ($16.7M)
2026-01-05	BUY	Market Buy	斎藤昌子	unknown	4.0K	¥1,583	-0.4%	¥6M ($41K)
2026-01-05	BUY	Market Buy	馬場久恵	unknown	12.0K	¥1,583	-0.4%	¥19M ($123K)
2026-01-05	BUY	Market Buy	馬場宏二郎	unknown	96.4K	¥1,583	-0.4%	¥153M ($989K)
2026-01-05	BUY	Market Buy	馬場邦明	unknown	111.3K	¥1,583	-0.4%	¥177M ($1.1M)
2026-01-05	BUY	Market Buy	株式会社インテリア井門	unknown	17.6K	¥1,583	-0.4%	¥28M ($181K)
2026-01-05	BUY	Market Buy	株式会社井門エンタープライズ	unknown	100.0K	¥1,583	-0.4%	¥159M ($1.0M)
2026-01-05	BUY	Market Buy	株式会社井門コーポレーション	unknown	258.7K	¥1,583	-0.4%	¥411M ($2.7M)
2026-01-05	BUY	Market Buy	株式会社カバロ企画	activist	1.6M	¥1,583	+0.4%	¥2.6B ($16.7M)
2026-01-05	BUY	unknown	斎藤昌子	strategic	4.0K	¥1,583	-0.4%	¥6M ($41K)
2026-01-05	BUY	unknown	馬場久恵	strategic	12.0K	¥1,583	-0.4%	¥19M ($123K)
2026-01-05	BUY	unknown	馬場宏二郎	activist	96.4K	¥1,583	-0.4%	¥153M ($989K)
2026-01-05	BUY	unknown	馬場雄一郎	activist	101.3K	¥1,583	-0.4%	¥161M ($1.0M)
2026-01-05	BUY	unknown	馬場邦明	other	111.3K	¥1,583	-0.4%	¥177M ($1.1M)

Showing the 50 most recent of 81 filings.

Frequently asked questions

Who has been buying Sanyu Construction Co.,Ltd. stock?: 12 distinct investors have filed 10 disclosed large-shareholding filings in Sanyu Construction Co.,Ltd. (1841), most recently on 2026-03-24. 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 Sanyu Construction Co.,Ltd. have?: Sanyu Construction Co.,Ltd. has 10 buy-side and 16 sell-side disclosures on record, covering ¥6.6B ($42.3M) in total reported value, spanning 2021-08-19 to 2026-03-24.
Where does StockDrifts get Sanyu Construction 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 Sanyu Construction Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.