Who has been buying Zuken Inc. stock?

5 distinct investors have filed 6 disclosed large-shareholding filings in Zuken Inc. (6947), most recently on 2025-10-07. 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 Zuken Inc. have?

Zuken Inc. has 6 buy-side and 8 sell-side disclosures on record, covering ¥2.7B ($17.7M) in total reported value, spanning 2021-08-17 to 2025-10-07.

Where does StockDrifts get Zuken Inc. 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.

Zuken Inc. 6947

Company

株式会社図研Zuken Inc.

Investors

Buys

Total Value

¥2.7B ($17.7M)

Avg Return

+5.88%

Last Filing

2025-10-07

Zuken Inc. (6947) has 6 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥2.7B ($17.7M) in reported transaction value. The earliest filing StockDrifts holds for Zuken Inc. is dated 2021-08-17; the most recent is 2025-10-07. 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 +5.88%, 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
2025-10-07	BUY	Market Buy	アーチザン・インベストメンツ・ジーピー・エルエルシー(Artisan Investments GP LLC) Artisan Investments GP LLC	passive	1.8M	¥4,880	-7.3%	¥1.5B ($9.7M)
2025-05-20	BUY	Market Buy	アーチザン・インベストメンツ・ジーピー・エルエルシー(Artisan Investments GP LLC) Artisan Investments GP LLC	passive	1.5M	¥5,170	-12.5%	¥1.2B ($7.8M)
2025-03-05	BUY	Market Buy	アーチザン・インベストメンツ・ジーピー・エルエルシー(Artisan Investments GP LLC) Artisan Investments GP LLC	passive	1.3M	¥4,790	-5.5%	¥6.1B ($39.1M)
2023-12-18	SELL	unknown	金子真人ホールディングス株式会社 Kaneko Makoto Holdings, Inc.	strategic	2.8M	¥3,880	-16.6%	¥1.6B ($10.0M)
2023-12-18	BUY	unknown	金子みね子 Mineko Kaneko	activist	580.4K	¥3,880	+16.6%	¥2.3B ($14.5M)
2023-12-18	SELL	unknown	金子真人 Masato Kaneko	activist	2.2M	¥3,880	-16.6%	¥406M ($2.6M)
2022-11-22	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	892.5K	¥3,220	-40.5%	¥959M ($6.2M)
2022-10-21	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.2M	¥3,320	-36.3%	¥2.2B ($14.4M)
2022-08-24	BUY	unknown	金子みね子 Mineko Kaneko	activist	580.4K	¥3,540	+27.8%	¥2.1B ($13.3M)
2022-08-24	SELL	unknown	金子真人 Masato Kaneko	activist	2.3M	¥3,540	-27.8%	¥1.7B ($11.2M)
2022-08-24	BUY	unknown	金子真人ホールディングス株式会社 Kaneko Makoto Holdings, Inc.	strategic	3.2M	¥3,540	+27.8%	¥11.5B ($74.0M)
2022-05-20	BUY	unknown	金子みね子 Mineko Kaneko	activist	580.4K	¥2,806	+61.3%	¥1.6B ($10.5M)
2022-05-20	SELL	unknown	金子真人 Masato Kaneko	activist	2.8M	¥2,806	-61.3%	¥1.4B ($9.1M)
2022-05-20	BUY	unknown	金子真人ホールディングス株式会社 Kaneko Makoto Holdings, Inc.	strategic	3.2M	¥2,806	+61.3%	¥9.1B ($58.7M)
2021-12-22	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.9M	¥3,680	+23.0%	¥1.2B ($8.0M)
2021-11-16	BUY	unknown	金子真人ホールディングス株式会社 Kaneko Makoto Holdings, Inc.	strategic	3.2M	¥3,995	+13.3%	¥12.9B ($83.5M)
2021-11-16	BUY	unknown	金子みね子 Mineko Kaneko	activist	580.4K	¥3,995	+13.3%	¥2.3B ($15.0M)
2021-11-16	SELL	unknown	金子真人 Masato Kaneko	activist	3.3M	¥3,995	-13.3%	¥2.0B ($12.8M)
2021-09-24	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.5M	¥4,430	+2.1%	¥1.2B ($7.5M)
2021-08-20	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.3M	¥3,340	+35.5%	¥4.2B ($27.2M)
2021-08-17	BUY	unknown	金子みね子 Mineko Kaneko	activist	580.4K	¥3,310	+36.7%	¥1.9B ($12.4M)
2021-08-17	SELL	unknown	金子真人 Masato Kaneko	activist	3.8M	¥3,310	-36.7%	¥1.7B ($10.7M)
2021-08-17	BUY	unknown	金子真人ホールディングス株式会社 Kaneko Makoto Holdings, Inc.	strategic	3.2M	¥3,310	+36.7%	¥10.7B ($69.2M)

Frequently asked questions

Who has been buying Zuken Inc. stock?: 5 distinct investors have filed 6 disclosed large-shareholding filings in Zuken Inc. (6947), most recently on 2025-10-07. 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 Zuken Inc. have?: Zuken Inc. has 6 buy-side and 8 sell-side disclosures on record, covering ¥2.7B ($17.7M) in total reported value, spanning 2021-08-17 to 2025-10-07.
Where does StockDrifts get Zuken Inc. 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 Zuken Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.