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

15 distinct investors have filed 43 disclosed large-shareholding filings in Nishimatsu Construction Co., Ltd. (1820), most recently on 2025-06-06. 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 Nishimatsu Construction Co., Ltd. have?

Nishimatsu Construction Co., Ltd. has 43 buy-side and 24 sell-side disclosures on record, covering ¥61.1B ($394.0M) in total reported value, spanning 2021-03-17 to 2025-06-06.

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.

Nishimatsu Construction Co., Ltd. 1820

Company

西松建設株式会社Nishimatsu Construction Co., Ltd.

Investors

Buys

Total Value

¥61.1B ($394.0M)

Avg Return

+56.94%

Last Filing

2025-06-06

Nishimatsu Construction Co., Ltd. (1820) has 43 disclosed large-shareholding filings and 24 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥61.1B ($394.0M) in reported transaction value. The earliest filing StockDrifts holds for Nishimatsu Construction Co., Ltd. is dated 2021-03-17; the most recent is 2025-06-06. Across these filings the average return since disclosure is +56.94%, 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
2025-06-06	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	373.0K	¥4,807	-17.7%	¥1.2B ($7.5M)
2025-06-06	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	8.7M	¥4,807	+17.7%	¥5.1B ($32.8M)
2025-06-06	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	224.0K	¥4,807	-17.7%	¥2.9B ($18.5M)
2025-06-06	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.1M	¥4,807	+17.7%	¥60M ($389K)
2024-11-21	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	7.6M	¥4,935	+14.7%	¥2.4B ($15.3M)
2024-11-07	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	7.2M	¥5,209	+8.6%	¥3.1B ($20.1M)
2024-10-07	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	6.6M	¥5,156	+9.8%	¥2.5B ($16.1M)
2024-09-17	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	6.1M	¥5,261	+7.6%	¥2.2B ($14.5M)
2024-09-05	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	5.7M	¥5,222	+8.4%	¥2.4B ($15.5M)
2024-08-26	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	5.2M	¥4,976	+13.7%	¥2.1B ($13.6M)
2024-08-14	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	4.8M	¥4,686	+20.8%	¥6.2B ($39.9M)
2024-07-22	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	614.0K	¥4,830	+17.2%	¥747M ($4.8M)
2024-07-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	35.5K	¥4,830	+17.2%	¥15.8B ($101.7M)
2024-07-22	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	825.3K	¥4,830	+17.2%	¥989M ($6.4M)
2024-07-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.1M	¥4,830	+17.2%	¥3.1B ($20.1M)
2023-06-23	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	4.6M	¥3,455	+63.8%	¥2.0B ($12.6M)
2023-04-07	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	unknown	0	¥3,425	-65.2%	¥438M ($2.8M)
2023-04-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	614.0K	¥3,425	-	-
2023-04-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	106.5K	¥3,425	+65.2%	¥19M ($123K)
2023-04-07	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	825.3K	¥3,425	-65.2%	¥19M ($123K)
2023-04-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.9M	¥3,425	-65.2%	¥2.2B ($13.9M)
2023-02-06	SELL	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	1.7M	¥3,385	-67.2%	¥1.1B ($6.8M)
2023-02-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	542.7K	¥3,385	-67.2%	¥809M ($5.2M)
2022-10-06	BUY	Market Buy	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	2.1M	¥3,865	+46.4%	¥172M ($1.1M)
2022-10-06	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	785.9K	¥3,865	-46.4%	¥473M ($3.0M)
2022-06-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	614.0K	¥4,000	-	-
2022-06-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	101.4K	¥4,000	-41.5%	¥44M ($287K)
2022-06-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	825.9K	¥4,000	-	-
2022-06-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.5M	¥4,000	+41.5%	¥1.8B ($11.9M)
2022-06-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	126.9K	¥4,000	-	¥508M ($3.3M)
2022-01-07	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	2.0M	¥3,730	+51.7%	¥7.5B ($48.5M)
2022-01-07	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	903.5K	¥3,730	+51.7%	¥3.4B ($21.7M)
2021-12-16	SELL	unknown	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	unknown	0	¥3,580	-58.1%	¥3.4B ($22.0M)
2021-12-16	SELL	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	¥3,580	-58.1%	¥5.5B ($35.7M)
2021-12-16	SELL	unknown	株式会社エスグラントコーポレーション S-Grant Corporation Co., Ltd.	unknown	0	¥3,580	-58.1%	¥5.5B ($35.3M)
2021-12-15	BUY	acquisition	伊藤忠商事株式会社 ITOCHU Corporation	strategic	4.0M	¥3,475	+62.9%	¥14.0B ($90.2M)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	614.0K	¥3,580	-	-
2021-12-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	108.6K	¥3,580	-58.1%	¥80M ($514K)
2021-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	825.9K	¥3,580	-	-
2021-12-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.1M	¥3,580	+58.1%	¥159M ($1.0M)
2021-11-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	132.4K	¥3,430	-	¥454M ($2.9M)
2021-11-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	825.9K	¥3,430	+65.0%	¥782M ($5.0M)
2021-11-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	614.0K	¥3,430	-	-
2021-11-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.0M	¥3,430	-65.0%	¥572M ($3.7M)
2021-11-19	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.	passive	1.5M	¥3,585	+57.9%	¥5.3B ($34.5M)
2021-11-19	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	1.7M	¥3,585	+57.9%	¥6.1B ($39.1M)
2021-11-19	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	904.4K	¥3,585	-	-
2021-11-19	BUY	Market Buy	株式会社エスグラントコーポレーション S-Grant Corporation Co., Ltd.	passive	1.5M	¥3,585	+57.9%	¥5.3B ($34.1M)
2021-11-19	SELL	Market Buy	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	passive	949.3K	¥3,585	-57.9%	¥8.4B ($53.9M)
2021-11-05	SELL	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	3.4M	¥3,225	-75.5%	¥125M ($810K)

Showing the 50 most recent of 100 filings.

Frequently asked questions

Who has been buying Nishimatsu Construction Co., Ltd. stock?: 15 distinct investors have filed 43 disclosed large-shareholding filings in Nishimatsu Construction Co., Ltd. (1820), most recently on 2025-06-06. 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 Nishimatsu Construction Co., Ltd. have?: Nishimatsu Construction Co., Ltd. has 43 buy-side and 24 sell-side disclosures on record, covering ¥61.1B ($394.0M) in total reported value, spanning 2021-03-17 to 2025-06-06.
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.