Who has been buying Di-Nikko Engineering Co., Ltd. stock?

6 distinct investors have filed 6 disclosed large-shareholding filings in Di-Nikko Engineering Co., Ltd. (6635), most recently on 2025-07-08. 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 Di-Nikko Engineering Co., Ltd. have?

Di-Nikko Engineering Co., Ltd. has 6 buy-side and 10 sell-side disclosures on record, covering ¥957M ($6.2M) in total reported value, spanning 2022-11-17 to 2025-07-08.

Where does StockDrifts get Di-Nikko Engineering 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.

Di-Nikko Engineering Co., Ltd. 6635

Company

株式会社大日光・エンジニアリングDi-Nikko Engineering Co., Ltd.

Investors

Buys

Total Value

¥957M ($6.2M)

Avg Return

+18.64%

Last Filing

2025-07-08

Di-Nikko Engineering Co., Ltd. (6635) has 6 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥957M ($6.2M) in reported transaction value. The earliest filing StockDrifts holds for Di-Nikko Engineering Co., Ltd. is dated 2022-11-17; the most recent is 2025-07-08. 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 +18.64%, 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
2026-07-23	BUY	unknown	山口琢也	activist	318.6K	¥668	-0.5%	¥213M ($1.4M)
2026-07-23	BUY	unknown	有限会社欅	activist	1.0M	¥668	-0.5%	¥699M ($4.5M)
2026-07-23	BUY	unknown	山口琢也	activist	318.6K	¥668	-0.5%	¥213M ($1.4M)
2026-07-23	BUY	unknown	有限会社欅	activist	1.0M	¥668	-0.5%	¥699M ($4.5M)
2025-07-08	BUY	unknown	山口琢也 Takuya Yamaguchi	activist	318.4K	¥474	+32.3%	¥76M ($491K)
2025-07-08	SELL	unknown	有限会社欅 Keyaki Co., Ltd.	activist	1.0M	¥474	-32.3%	¥120M ($776K)
2025-07-02	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	313.7K	¥469	-33.7%	¥33M ($212K)
2024-02-21	SELL	negotiated	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	113.2K	¥506	-23.9%	¥64M ($413K)
2024-02-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	161.4K	¥506	+23.9%	¥82M ($527K)
2024-02-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	161.4K	¥515	+21.8%	¥83M ($536K)
2024-02-06	BUY	negotiated	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	239.5K	¥515	+21.8%	¥123M ($796K)
2024-02-05	BUY	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	383.7K	¥520	+20.6%	¥200M ($1.3M)
2023-09-25	BUY	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	383.7K	¥542	+15.7%	¥208M ($1.3M)
2023-09-06	SELL	negotiated	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.	unknown	0	¥545	-15.1%	¥1M ($8K)
2023-09-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	161.4K	¥545	+15.1%	¥88M ($568K)
2023-09-05	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	565.2K	¥537	-16.8%	¥37M ($238K)
2023-09-05	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	383.7K	¥537	-16.8%	¥98M ($629K)
2023-09-01	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	566.0K	¥534	-17.4%	¥36M ($234K)
2023-09-01	BUY	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	566.0K	¥534	+17.4%	¥36M ($234K)
2023-07-06	BUY	negotiated	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	233.5K	¥587	+6.8%	¥137M ($884K)
2023-07-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	161.4K	¥587	+6.8%	¥95M ($611K)
2023-06-29	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	633.7K	¥583	-7.5%	¥20M ($130K)
2023-04-19	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	690.0K	¥611	-2.6%	¥12M ($78K)
2023-04-19	SELL	unknown	株式会社NCネットワーク NC Network Co., Ltd.	other	668.8K	¥611	-2.6%	¥115M ($743K)
2022-11-17	BUY	private	リーウォウインヴェストメントグループリミテッド LEE WO INVESTMENT GROUP LIMITED	other	1.3M	¥512	+22.5%	¥660M ($4.3M)

Frequently asked questions

Who has been buying Di-Nikko Engineering Co., Ltd. stock?: 6 distinct investors have filed 6 disclosed large-shareholding filings in Di-Nikko Engineering Co., Ltd. (6635), most recently on 2025-07-08. 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 Di-Nikko Engineering Co., Ltd. have?: Di-Nikko Engineering Co., Ltd. has 6 buy-side and 10 sell-side disclosures on record, covering ¥957M ($6.2M) in total reported value, spanning 2022-11-17 to 2025-07-08.
Where does StockDrifts get Di-Nikko Engineering 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 Di-Nikko Engineering Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.