Who has been buying Tecnos Japan Incorporated stock?

8 distinct investors have filed 17 disclosed large-shareholding filings in Tecnos Japan Incorporated (3666), most recently on 2025-05-14. 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 Tecnos Japan Incorporated have?

Tecnos Japan Incorporated has 17 buy-side and 12 sell-side disclosures on record, covering ¥7.9B ($50.8M) in total reported value, spanning 2021-09-06 to 2025-05-14.

Where does StockDrifts get Tecnos Japan Incorporated 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.

Tecnos Japan Incorporated 3666

Company

株式会社テクノスジャパンTecnos Japan Incorporated

Investors

Buys

Total Value

¥7.9B ($50.8M)

Avg Return

+46.64%

Last Filing

2025-05-14

Tecnos Japan Incorporated (3666) has 17 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥7.9B ($50.8M) in reported transaction value. The earliest filing StockDrifts holds for Tecnos Japan Incorporated is dated 2021-09-06; the most recent is 2025-05-14. 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 +46.64%, 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
2025-05-14	SELL	Market Buy	アセット・バリュー・インベスターズ・リミテッド(Asset Value Investors Limited) ASSET VALUE INVESTORS LIMITED	passive	0	¥1,151	+0.0%	¥1.4B ($9.1M)
2025-04-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	15.1K	¥1,149	+0.2%	¥295M ($1.9M)
2025-04-07	BUY	acquisition	シー・シックス・エイト株式会社 C6-8 Co., Ltd.	activist	19.3M	¥1,149	+0.2%	¥1.9B ($12.3M)
2025-04-04	SELL	unknown	東海東京証券株式会社 Tokai Tokyo Securities Co., Ltd.	other	0	¥1,149	-0.2%	¥1.8B ($11.5M)
2025-03-28	SELL	Market Buy	アセット・バリュー・インベスターズ・リミテッド(Asset Value Investors Limited) ASSET VALUE INVESTORS LIMITED	passive	0	¥1,149	-0.2%	¥2.5B ($15.8M)
2025-03-25	BUY	acquisition	シー・シックス・エイト株式会社 C6-8 Co., Ltd.	activist	17.7M	¥1,148	+0.3%	¥20.3B ($130.9M)
2025-03-24	SELL	unknown	德平正憲 Masanori Tokuhira	unknown	0	¥1,146	-0.4%	¥2.3B ($14.6M)
2025-03-24	BUY	acquisition	シー・シックス・エイト株式会社 C6-8 Co., Ltd.	activist	17.7M	¥1,146	+0.4%	¥20.3B ($130.7M)
2025-03-21	BUY	Market Buy	東海東京証券株式会社 Tokai Tokyo Securities Co., Ltd.	other	1.5M	¥1,146	+0.4%	¥442M ($2.9M)
2025-02-21	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.3M	¥1,149	+0.2%	¥1.4B ($9.3M)
2025-02-20	BUY	unknown	東海東京証券株式会社 Tokai Tokyo Securities Co., Ltd.	other	1.2M	¥1,149	+0.2%	¥1.3B ($8.6M)
2025-02-07	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド(Asset Value Investors Limited) ASSET VALUE INVESTORS LIMITED	passive	2.1M	¥1,151	+0.0%	¥82M ($530K)
2025-02-05	BUY	unknown	德平正憲 Masanori Tokuhira	strategic	2.0M	¥983	+17.1%	¥1.9B ($12.5M)
2025-01-20	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	2.1M	¥806	+42.8%	¥168M ($1.1M)
2024-12-04	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.9M	¥735	+56.6%	¥154M ($996K)
2024-07-31	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.6M	¥835	+37.8%	¥296M ($1.9M)
2024-07-17	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.3M	¥788	+46.1%	¥186M ($1.2M)
2024-07-11	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.1M	¥761	+51.3%	¥801M ($5.2M)
2022-01-20	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	379.4K	¥502	-129.3%	¥110M ($707K)
2022-01-20	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	460.2K	¥502	+129.3%	¥4M ($26K)
2021-12-10	SELL	unknown	德平眞紀子 Makiko Tokuhira	strategic	0	¥502	-129.3%	¥60M ($390K)
2021-12-10	BUY	unknown	德平正憲 Masanori Tokuhira	strategic	2.0M	¥502	+129.3%	¥975M ($6.3M)
2021-12-10	BUY	unknown	德平正憲 Masanori Tokuhira	strategic	2.0M	¥502	+129.3%	¥975M ($6.3M)
2021-12-10	SELL	unknown	德平眞紀子 Makiko Tokuhira	strategic	0	¥502	-129.3%	¥60M ($390K)
2021-09-09	SELL	unknown	德平眞紀子 Makiko Tokuhira	strategic	119.6K	¥624	-84.5%	¥52M ($337K)
2021-09-09	BUY	unknown	德平眞紀子 Makiko Tokuhira	strategic	204.0K	¥624	+84.5%	¥127M ($821K)
2021-09-09	SELL	unknown	德平眞紀子 Makiko Tokuhira	strategic	119.6K	¥624	-84.5%	¥52M ($337K)
2021-09-09	BUY	unknown	德平眞紀子 Makiko Tokuhira	strategic	204.0K	¥624	+84.5%	¥127M ($821K)
2021-09-09	SELL	unknown	德平正憲 Masanori Tokuhira	strategic	2.7M	¥624	-84.5%	¥24M ($156K)
2021-09-09	BUY	unknown	德平正憲 Masanori Tokuhira	strategic	2.6M	¥624	+84.5%	¥1.6B ($10.3M)
2021-09-09	SELL	unknown	德平正憲 Masanori Tokuhira	strategic	2.7M	¥624	-84.5%	¥24M ($156K)
2021-09-09	BUY	unknown	德平正憲 Masanori Tokuhira	strategic	2.6M	¥624	+84.5%	¥1.6B ($10.3M)
2021-09-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	598.1K	¥642	-79.3%	¥136M ($879K)
2021-09-06	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	452.3K	¥642	+79.3%	¥290M ($1.9M)

Frequently asked questions

Who has been buying Tecnos Japan Incorporated stock?: 8 distinct investors have filed 17 disclosed large-shareholding filings in Tecnos Japan Incorporated (3666), most recently on 2025-05-14. 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 Tecnos Japan Incorporated have?: Tecnos Japan Incorporated has 17 buy-side and 12 sell-side disclosures on record, covering ¥7.9B ($50.8M) in total reported value, spanning 2021-09-06 to 2025-05-14.
Where does StockDrifts get Tecnos Japan Incorporated 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 Tecnos Japan Incorporated. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.