Who has been buying Nippon Koei Co., Ltd. stock?

5 distinct investors have filed 20 disclosed large-shareholding filings in Nippon Koei Co., Ltd. (1954), most recently on 2023-02-02. 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 Nippon Koei Co., Ltd. have?

Nippon Koei Co., Ltd. has 20 buy-side and 4 sell-side disclosures on record, covering ¥4.8B ($31.2M) in total reported value, spanning 2021-04-07 to 2023-02-02.

Where does StockDrifts get Nippon Koei 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.

Nippon Koei Co., Ltd. 1954

Company

日本工営(株)Nippon Koei Co., Ltd.

Investors

Buys

Total Value

¥4.8B ($31.2M)

Avg Return

+15.61%

Last Filing

2023-02-02

Nippon Koei Co., Ltd. (1954) has 20 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥4.8B ($31.2M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Koei Co., Ltd. is dated 2021-04-07; the most recent is 2023-02-02. 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 +15.61%, 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
2023-02-02	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	10.1K	¥3,530	+6.0%	¥3.5B ($22.4M)
2023-02-02	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,530	+6.0%	¥1.3B ($8.7M)
2023-02-02	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	189.9K	¥3,530	+6.0%	¥670M ($4.3M)
2023-02-02	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥3,530	+6.0%	¥16M ($103K)
2023-02-02	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,530	+6.0%	¥282M ($1.8M)
2023-01-18	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥3,430	+9.0%	¥47M ($300K)
2023-01-18	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,430	+9.0%	¥274M ($1.8M)
2023-01-18	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	72.4K	¥3,430	+9.0%	¥248M ($1.6M)
2023-01-18	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,430	+9.0%	¥1.3B ($8.5M)
2023-01-18	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	189.9K	¥3,430	+9.0%	¥62M ($400K)
2022-07-28	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥3,470	+7.8%	¥235M ($1.5M)
2022-07-28	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,470	+7.8%	¥278M ($1.8M)
2022-07-28	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	4.7K	¥3,470	+7.8%	¥517M ($3.3M)
2022-07-28	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,470	+7.8%	¥1.3B ($8.6M)
2022-07-28	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	172.1K	¥3,470	+7.8%	¥68M ($438K)
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	152.8K	¥3,270	+14.4%	¥74M ($477K)
2022-06-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,270	+14.4%	¥262M ($1.7M)
2022-06-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	302.6K	¥3,270	+14.4%	¥990M ($6.4M)
2022-06-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,270	+14.4%	¥1.2B ($8.1M)
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	1.1M	¥3,270	+14.4%	¥202M ($1.3M)
2022-03-02	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	129.7K	¥2,964	+26.2%	¥107M ($691K)
2022-03-02	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥2,964	+26.2%	¥366M ($2.4M)
2022-03-02	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥2,964	+26.2%	¥237M ($1.5M)
2022-03-02	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥2,964	+26.2%	¥1.1B ($7.3M)
2021-07-16	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	93.2K	¥3,020	+23.8%	¥281M ($1.8M)
2021-07-16	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	938.6K	¥3,020	+23.8%	¥18M ($117K)
2021-07-16	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,020	+23.8%	¥242M ($1.6M)
2021-07-16	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥3,020	-23.8%	¥673M ($4.3M)
2021-07-16	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,020	+23.8%	¥1.2B ($7.4M)
2021-07-13	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	93.2K	¥3,045	+22.8%	¥284M ($1.8M)
2021-07-13	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	933.3K	¥3,045	+22.8%	¥32M ($207K)
2021-07-13	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,045	+22.8%	¥244M ($1.6M)
2021-07-13	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	223.4K	¥3,045	-22.8%	¥687M ($4.4M)
2021-07-13	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,045	+22.8%	¥1.2B ($7.5M)
2021-06-23	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	93.2K	¥3,260	+14.7%	¥304M ($2.0M)
2021-06-23	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	921.8K	¥3,260	+14.7%	¥25M ($158K)
2021-06-23	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,260	+14.7%	¥261M ($1.7M)
2021-06-23	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	447.9K	¥3,260	+14.7%	¥731M ($4.7M)
2021-06-23	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,260	+14.7%	¥1.2B ($8.0M)
2021-06-11	BUY	Market Buy	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	93.2K	¥3,110	+20.3%	¥9M ($60K)
2021-06-11	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	914.7K	¥3,110	+20.3%	¥229M ($1.5M)
2021-06-11	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,110	+20.3%	¥14M ($91K)
2021-06-11	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	224.7K	¥3,110	+20.3%	¥699M ($4.5M)
2021-06-11	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,110	+20.3%	¥66M ($423K)
2021-04-07	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.	other	95.8K	¥3,100	-20.6%	¥15M ($96K)
2021-04-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	892.2K	¥3,100	+20.6%	¥40M ($255K)
2021-04-07	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥3,100	-20.6%	¥297M ($1.9M)
2021-04-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	382.1K	¥3,100	+20.6%	¥1.2B ($7.6M)

Frequently asked questions

Who has been buying Nippon Koei Co., Ltd. stock?: 5 distinct investors have filed 20 disclosed large-shareholding filings in Nippon Koei Co., Ltd. (1954), most recently on 2023-02-02. 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 Nippon Koei Co., Ltd. have?: Nippon Koei Co., Ltd. has 20 buy-side and 4 sell-side disclosures on record, covering ¥4.8B ($31.2M) in total reported value, spanning 2021-04-07 to 2023-02-02.
Where does StockDrifts get Nippon Koei 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 Nippon Koei Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.