Who has been buying CMK Corporation stock?

18 distinct investors have filed 52 disclosed large-shareholding filings in CMK Corporation (6958), most recently on 2026-05-11. 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 CMK Corporation have?

CMK Corporation has 52 buy-side and 62 sell-side disclosures on record, covering ¥17.4B ($112.4M) in total reported value, spanning 2021-11-24 to 2026-05-11.

Where does StockDrifts get CMK Corporation 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.

CMK Corporation 6958

Company

日本シイエムケイ株式会社CMK Corporation

Investors

Buys

Total Value

¥17.4B ($112.4M)

Avg Return

+16.69%

Last Filing

2026-05-11

CMK Corporation (6958) has 52 disclosed large-shareholding filings and 62 disclosed disposals on record, filed by 18 distinct investors. Together those filings cover ¥17.4B ($112.4M) in reported transaction value. The earliest filing StockDrifts holds for CMK Corporation is dated 2021-11-24; the most recent is 2026-05-11. 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 +16.69%, 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
2026-08-05	BUY	Market Buy	fundnote株式会社 fundnote	activist	10.1M	¥670	+16.9%	¥549M ($3.5M)
2026-07-23	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.2M	¥648	+20.8%	¥9M ($60K)
2026-07-23	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	841.2K	¥648	-20.8%	¥531M ($3.4M)
2026-07-23	BUY	Market Buy	野村證券株式会社	other	52.6K	¥648	+20.8%	¥18M ($119K)
2026-07-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.7M	¥634	+5.7%	¥1.1B ($6.8M)
2026-07-06	BUY	unknown	野村アセットマネジメント株式会社	other	2.2M	¥634	+5.7%	¥1.4B ($8.9M)
2026-07-06	BUY	unknown	野村證券株式会社	other	22.7K	¥634	+5.7%	¥14M ($93K)
2026-06-29	SELL	unknown	fundnote株式会社 fundnote	activist	9.3M	¥661	+3.9%	¥721M ($4.7M)
2026-06-26	SELL	unknown	fundnote株式会社 fundnote	activist	10.4M	¥657	+3.2%	¥684M ($4.4M)
2026-05-22	BUY	Market Buy	fundnote株式会社 fundnote	activist	11.4M	¥695	+7.6%	¥545M ($3.5M)
2026-05-19	SELL	unknown	fundnote株式会社 fundnote	activist	10.6M	¥665	-8.4%	¥531M ($3.4M)
2026-05-11	BUY	Market Buy	fundnote株式会社 fundnote	activist	11.4M	¥650	+20.6%	¥732M ($4.7M)
2026-04-06	BUY	Market Buy	fundnote株式会社 fundnote	activist	10.3M	¥555	+15.5%	¥415M ($2.7M)
2026-03-11	BUY	Market Buy	fundnote株式会社 fundnote	activist	9.6M	¥599	+3.3%	¥483M ($3.1M)
2026-03-09	BUY	Market Buy	fundnote株式会社 fundnote	activist	8.8M	¥542	+14.2%	¥417M ($2.7M)
2026-01-20	SELL	unknown	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	2.9M	¥531	-16.6%	¥398M ($2.6M)
2025-12-22	BUY	Market Buy	fundnote株式会社 fundnote	activist	8.0M	¥505	+22.6%	¥652M ($4.2M)
2025-12-09	BUY	unknown	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	3.6M	¥495	+25.1%	¥364M ($2.3M)
2025-12-09	BUY	Market Buy	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	3.6M	¥495	+25.1%	¥364M ($2.3M)
2025-12-05	BUY	Market Buy	fundnote株式会社 fundnote	activist	6.7M	¥500	+23.8%	¥613M ($4.0M)
2025-11-21	BUY	Market Buy	fundnote株式会社 fundnote	activist	5.5M	¥487	+27.1%	¥354M ($2.3M)
2025-11-21	BUY	unknown	fundnote株式会社 fundnote	activist	5.5M	¥487	+27.1%	¥354M ($2.3M)
2025-11-10	BUY	unknown	fundnote株式会社 fundnote	activist	4.7M	¥455	+36.0%	¥2.2B ($13.9M)
2025-11-10	BUY	unknown	fundnote株式会社 fundnote	activist	4.7M	¥455	+36.0%	¥2.2B ($13.9M)
2025-10-09	BUY	Market Buy	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	4.3M	¥380	+62.9%	¥282M ($1.8M)
2025-10-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.0M	¥380	-62.9%	¥146M ($944K)
2025-10-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	151.6K	¥380	-62.9%	¥222M ($1.4M)
2025-10-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥380	+62.9%	¥979M ($6.3M)
2025-09-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.4M	¥356	-73.9%	¥426M ($2.8M)
2025-09-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	731.3K	¥356	-73.9%	¥10M ($66K)
2025-09-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥356	+73.9%	¥917M ($5.9M)
2025-09-05	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.6M	¥357	-73.4%	¥275M ($1.8M)
2025-09-05	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	762.0K	¥357	+73.4%	¥3M ($16K)
2025-09-05	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥357	+73.4%	¥920M ($5.9M)
2025-09-01	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.4M	¥353	-75.3%	¥264M ($1.7M)
2025-09-01	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	753.1K	¥353	+75.3%	¥3M ($16K)
2025-09-01	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥353	-75.3%	¥3M ($16K)
2025-07-15	BUY	unknown	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	3.6M	¥342	+81.0%	¥1.2B ($7.9M)
2025-06-30	SELL	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	880.3K	¥333	-85.9%	¥64M ($413K)
2025-06-30	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.6M	¥333	-85.9%	¥475M ($3.1M)
2025-06-23	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	67.3K	¥315	+96.5%	¥2.0B ($12.8M)
2025-06-23	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.1M	¥315	+96.5%	¥1.3B ($8.4M)
2025-06-23	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	748.1K	¥315	+96.5%	¥204M ($1.3M)
2025-06-23	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥315	+96.5%	¥812M ($5.2M)
2025-06-19	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	97.3K	¥326	-89.9%	¥12M ($75K)
2025-06-19	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.1M	¥326	-89.9%	¥214M ($1.4M)
2025-06-19	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	100.6K	¥326	-89.9%	¥9M ($60K)
2025-06-19	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.6M	¥326	+89.9%	¥840M ($5.4M)
2025-03-19	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	134.5K	¥444	+39.4%	¥60M ($385K)
2025-03-19	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.8M	¥444	-39.4%	¥339M ($2.2M)

Showing the 50 most recent of 170 filings.

Frequently asked questions

Who has been buying CMK Corporation stock?: 18 distinct investors have filed 52 disclosed large-shareholding filings in CMK Corporation (6958), most recently on 2026-05-11. 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 CMK Corporation have?: CMK Corporation has 52 buy-side and 62 sell-side disclosures on record, covering ¥17.4B ($112.4M) in total reported value, spanning 2021-11-24 to 2026-05-11.
Where does StockDrifts get CMK Corporation 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 CMK Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.