Who has been buying Sumiken Mitsui Road Co.,Ltd. stock?

4 distinct investors have filed 4 disclosed large-shareholding filings in Sumiken Mitsui Road Co.,Ltd. (1776), most recently on 2026-05-14. 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 Sumiken Mitsui Road Co.,Ltd. have?

Sumiken Mitsui Road Co.,Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥8.2B ($53.1M) in total reported value, spanning 2021-08-20 to 2026-05-14.

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.

Sumiken Mitsui Road Co.,Ltd. 1776

Company

三井住建道路株式会社Sumiken Mitsui Road Co.,Ltd.

Investors

Buys

Total Value

¥8.2B ($53.1M)

Avg Return

+51.39%

Last Filing

2026-05-14

Sumiken Mitsui Road Co.,Ltd. (1776) has 4 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥8.2B ($53.1M) in reported transaction value. The earliest filing StockDrifts holds for Sumiken Mitsui Road Co.,Ltd. is dated 2021-08-20; the most recent is 2026-05-14. Across these filings the average return since disclosure is +51.39%, 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
2026-05-14	SELL	negotiated	三井住友建設株式会社 Sumitomo Mitsui Construction Co.,Ltd.	activist	9.3M	¥1,990	-0.3%	¥17.4B ($112.4M)
2026-04-28	SELL	unknown	株式会社シティインデックスイレブンス	unknown	0	¥1,986	-0.5%	¥251M ($1.6M)
2026-04-28	SELL	unknown	野村絢	unknown	0	¥1,986	-0.5%	¥673M ($4.3M)
2026-04-27	BUY	Market Buy	三井住友建設株式会社 Sumitomo Mitsui Construction Co.,Ltd.	activist	8.8M	¥1,986	+0.5%	¥7.7B ($49.6M)
2026-04-27	BUY	negotiated	三井住友建設株式会社 Sumitomo Mitsui Construction Co.,Ltd.	strategic	10.0M	¥1,986	-	-
2025-04-01	BUY	unknown	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	126.5K	¥1,353	+47.5%	¥171M ($1.1M)
2025-04-01	BUY	unknown	野村絢 Aya Nomura (Murakami family)	activist	338.3K	¥1,353	+47.5%	¥458M ($3.0M)
2022-12-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	350.1K	¥818	-144.0%	¥116M ($749K)
2022-11-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	491.4K	¥816	-144.6%	¥119M ($767K)
2022-08-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	637.0K	¥937	-113.0%	¥96M ($623K)
2021-08-20	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	740.6K	¥935	+113.5%	¥95M ($616K)

Frequently asked questions

Who has been buying Sumiken Mitsui Road Co.,Ltd. stock?: 4 distinct investors have filed 4 disclosed large-shareholding filings in Sumiken Mitsui Road Co.,Ltd. (1776), most recently on 2026-05-14. 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 Sumiken Mitsui Road Co.,Ltd. have?: Sumiken Mitsui Road Co.,Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥8.2B ($53.1M) in total reported value, spanning 2021-08-20 to 2026-05-14.
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.