Who has been buying Sumitomo Mitsui Construction Co.,Ltd. stock?

13 distinct investors have filed 40 disclosed large-shareholding filings in Sumitomo Mitsui Construction Co.,Ltd. (1821), 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 Sumitomo Mitsui Construction Co.,Ltd. have?

Sumitomo Mitsui Construction Co.,Ltd. has 40 buy-side and 19 sell-side disclosures on record, spanning 2021-11-29 to 2025-10-06.

Where does StockDrifts get Sumitomo Mitsui 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.

Sumitomo Mitsui Construction Co.,Ltd. 1821

Company

三井住友建設株式会社Sumitomo Mitsui Construction Co.,Ltd.

Investors

Buys

Total Value

—

Avg Return

—

Last Filing

2025-10-06

Sumitomo Mitsui Construction Co.,Ltd. (1821) has 40 disclosed large-shareholding filings and 19 disclosed disposals on record, filed by 13 distinct investors. The earliest filing StockDrifts holds for Sumitomo Mitsui Construction Co.,Ltd. is dated 2021-11-29; 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).

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2025-10-06	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	70.5K	-	-	-
2025-10-06	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.2M	-	-	-
2025-10-06	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	348.4K	-	-	-
2025-09-26	SELL	unknown	カダンキャピタルファンドピーティーイーエルティーディー KADAN CAPITAL FUND PTE. LTD.	unknown	0	-	-	-
2025-09-26	SELL	unknown	株式会社レノ Reno Inc. (Murakami-linked)	unknown	0	-	-	-
2025-09-26	SELL	unknown	野村絢 Aya Nomura (Murakami family)	unknown	0	-	-	-
2025-09-26	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.	unknown	0	-	-	-
2025-09-19	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	4.5M	-	-	-
2025-09-19	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	7.5M	-	-	-
2025-09-19	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	3.4K	-	-	-
2025-09-19	BUY	acquisition	インフロニア・ホールディングス株式会社 INFRONEER Holdings Inc.	corporate	126.5M	-	-	-
2025-09-19	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	3.4M	-	-	-
2025-09-19	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.2M	-	-	-
2025-09-04	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.9M	-	-	-
2025-09-04	BUY	Market Buy	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	9.6M	-	-	-
2025-09-04	SELL	Market Buy	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	26.2K	-	-	-
2025-09-04	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	4.8M	-	-	-
2025-08-21	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	43.9K	-	-	-
2025-08-21	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	9.3M	-	-	-
2025-06-18	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	3.7M	-	-	-
2025-06-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.3M	-	-	-
2025-06-18	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-75.7K	-	-	-
2025-05-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	5.0M	-	-	-
2025-05-20	BUY	unknown	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.8M	-	-	-
2025-05-20	BUY	unknown	野村絢 Aya Nomura (Murakami family)	activist	15.4M	-	-	-
2025-05-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	866.6K	-	-	-
2025-05-20	BUY	unknown	カダンキャピタルファンドピーティーイーエルティーディー KADAN CAPITAL FUND PTE. LTD.	activist	15.0M	-	-	-
2025-05-20	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	100	-	-	-
2025-05-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.3M	-	-	-
2025-04-15	BUY	Market Buy	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	100	-	-	-
2025-04-15	BUY	Market Buy	カダンキャピタルファンドピーティーイーエルティーディー KADAN CAPITAL FUND PTE. LTD.	activist	15.0M	-	-	-
2025-04-15	BUY	Market Buy	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.8M	-	-	-
2025-04-15	SELL	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	unknown	0	-	-	-
2025-04-15	BUY	Market Buy	野村絢 Aya Nomura (Murakami family)	activist	15.4M	-	-	-
2025-03-19	BUY	Market Buy	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.6M	-	-	-
2025-03-19	BUY	Market Buy	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	100	-	-	-
2025-03-19	BUY	Market Buy	野村絢 Aya Nomura (Murakami family)	activist	14.8M	-	-	-
2025-03-19	BUY	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	activist	14.5M	-	-	-
2025-01-07	BUY	Market Buy	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.6M	-	-	-
2025-01-07	BUY	Market Buy	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	100	-	-	-
2025-01-07	BUY	Market Buy	野村絢 Aya Nomura (Murakami family)	activist	14.8M	-	-	-
2025-01-07	BUY	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	activist	12.9M	-	-	-
2024-12-24	BUY	Market Buy	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.6M	-	-	-
2024-12-24	BUY	Market Buy	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	100	-	-	-
2024-12-24	BUY	Market Buy	野村絢 Aya Nomura (Murakami family)	activist	14.8M	-	-	-
2024-12-24	BUY	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	activist	11.2M	-	-	-
2024-12-17	BUY	Market Buy	株式会社レノ Reno Inc. (Murakami-linked)	activist	14.6M	-	-	-
2024-12-17	BUY	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	activist	9.6M	-	-	-
2024-12-17	BUY	Market Buy	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	100	-	-	-
2024-12-17	BUY	Market Buy	野村絢 Aya Nomura (Murakami family)	activist	14.8M	-	-	-

Showing the 50 most recent of 111 filings.

Frequently asked questions

Who has been buying Sumitomo Mitsui Construction Co.,Ltd. stock?: 13 distinct investors have filed 40 disclosed large-shareholding filings in Sumitomo Mitsui Construction Co.,Ltd. (1821), 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 Sumitomo Mitsui Construction Co.,Ltd. have?: Sumitomo Mitsui Construction Co.,Ltd. has 40 buy-side and 19 sell-side disclosures on record, spanning 2021-11-29 to 2025-10-06.
Where does StockDrifts get Sumitomo Mitsui 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 Sumitomo Mitsui Construction Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.