Who has been buying Taiyo Technolex Co.,Ltd. stock?

5 distinct investors have filed 2 disclosed large-shareholding filings in Taiyo Technolex Co.,Ltd. (6663), most recently on 2025-12-15. 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 Taiyo Technolex Co.,Ltd. have?

Taiyo Technolex Co.,Ltd. has 2 buy-side and 13 sell-side disclosures on record, covering ¥34M ($219K) in total reported value, spanning 2023-10-27 to 2025-12-15.

Where does StockDrifts get Taiyo Technolex 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.

Taiyo Technolex Co.,Ltd. 6663

Company

太洋工業株式会社Taiyo Technolex Co.,Ltd.

Investors

Buys

Total Value

¥34M ($219K)

Avg Return

+2.62%

Last Filing

2025-12-15

Taiyo Technolex Co.,Ltd. (6663) has 2 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥34M ($219K) in reported transaction value. The earliest filing StockDrifts holds for Taiyo Technolex Co.,Ltd. is dated 2023-10-27; the most recent is 2025-12-15. 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 +2.62%, 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
2025-12-15	BUY	unknown	株式会社細江ホールディングス	activist	1.6M	¥255	-38.4%	¥565M ($3.6M)
2025-12-15	SELL	unknown	細江正大	activist	350.0K	¥255	-38.4%	¥124M ($797K)
2025-12-15	BUY	unknown	細江美則	activist	99.9K	¥255	-38.4%	¥35M ($228K)
2025-11-17	BUY	unknown	株式会社細江ホールディングス Hosoe Holdings Co., Ltd.	activist	1.6M	¥260	+35.8%	¥416M ($2.7M)
2025-11-17	SELL	unknown	細江正大 Masahiro Hosoe	activist	454.3K	¥260	-35.8%	¥8M ($49K)
2025-11-17	SELL	unknown	細江美則 YOSHINORI HOSOE	activist	99.9K	¥260	-35.8%	¥65M ($419K)
2025-07-10	SELL	unknown	紀陽興産株式会社 kiyokosan	strategic	190.0K	¥278	-27.0%	¥40M ($259K)
2025-07-10	BUY	unknown	紀陽興産株式会社 kiyokosan	strategic	390.0K	¥278	+27.0%	¥1M ($7K)
2025-07-10	SELL	unknown	紀陽興産株式会社 kiyokosan	strategic	332.0K	¥278	-27.0%	¥17M ($109K)
2025-07-10	SELL	unknown	紀陽興産株式会社 kiyokosan	strategic	390.0K	¥278	-27.0%	¥1M ($7K)
2025-07-10	BUY	unknown	紀陽興産株式会社 kiyokosan	strategic	190.0K	¥278	+27.0%	¥40M ($259K)
2025-07-10	BUY	unknown	紀陽興産株式会社 kiyokosan	strategic	332.0K	¥278	+27.0%	¥17M ($109K)
2024-05-17	BUY	unknown	細江正大 Masahiro Hosoe	activist	483.8K	¥309	+14.2%	¥149M ($964K)
2024-05-17	SELL	unknown	株式会社細江ホールディングス Hosoe Holdings Co., Ltd.	activist	1.6M	¥309	-14.2%	¥3M ($22K)
2024-05-17	SELL	unknown	株式会社細江ホールディングス Hosoe Holdings Co., Ltd.	activist	1.6M	¥309	-14.2%	¥3M ($22K)
2024-05-17	BUY	unknown	細江正大 Masahiro Hosoe	activist	483.8K	¥309	+14.2%	¥149M ($964K)
2024-05-17	SELL	unknown	細江美則 YOSHINORI HOSOE	activist	349.9K	¥309	-14.2%	¥54M ($348K)
2024-05-17	SELL	unknown	細江美則 YOSHINORI HOSOE	activist	349.9K	¥309	-14.2%	¥54M ($348K)
2023-10-27	SELL	Market Buy	株式会社細江ホールディングス Hosoe Holdings Co., Ltd.	unknown	1.6M	¥344	-2.6%	¥8M ($49K)
2023-10-27	SELL	unknown	株式会社細江ホールディングス Hosoe Holdings Co., Ltd.	activist	1.6M	¥344	-2.6%	¥8M ($49K)
2023-10-27	SELL	unknown	細江正大 Masahiro Hosoe	activist	480.0K	¥344	-2.6%	¥2M ($13K)
2023-10-27	BUY	Market Buy	細江美則 YOSHINORI HOSOE	activist	520.7K	¥344	+2.6%	¥17M ($110K)
2023-10-27	BUY	unknown	細江美則 YOSHINORI HOSOE	activist	520.7K	¥344	+2.6%	¥17M ($110K)

Frequently asked questions

Who has been buying Taiyo Technolex Co.,Ltd. stock?: 5 distinct investors have filed 2 disclosed large-shareholding filings in Taiyo Technolex Co.,Ltd. (6663), most recently on 2025-12-15. 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 Taiyo Technolex Co.,Ltd. have?: Taiyo Technolex Co.,Ltd. has 2 buy-side and 13 sell-side disclosures on record, covering ¥34M ($219K) in total reported value, spanning 2023-10-27 to 2025-12-15.
Where does StockDrifts get Taiyo Technolex 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 Taiyo Technolex Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.