Who has been buying CMC Corporation stock?

7 distinct investors have filed 7 disclosed large-shareholding filings in CMC Corporation (2185), most recently on 2025-09-26. 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 CMC Corporation have?

CMC Corporation has 7 buy-side and 2 sell-side disclosures on record, covering ¥440M ($2.8M) in total reported value, spanning 2022-12-27 to 2025-09-26.

Where does StockDrifts get CMC 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.

CMC Corporation 2185

Company

株式会社シイエム・シイCMC Corporation

Investors

Buys

Total Value

¥440M ($2.8M)

Avg Return

+35.54%

Last Filing

2025-09-26

CMC Corporation (2185) has 7 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥440M ($2.8M) in reported transaction value. The earliest filing StockDrifts holds for CMC Corporation is dated 2022-12-27; the most recent is 2025-09-26. 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 +35.54%, 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
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	17.7K	¥1,748	+8.6%	¥30M ($194K)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	996.5K	¥1,748	+8.6%	¥198M ($1.3M)
2025-03-18	BUY	Market Buy	かん・ふみ合同会社 Kan-Fumi LLC	strategic	100.0K	¥1,596	+19.0%	¥160M ($1.0M)
2025-03-18	BUY	Market Buy	株式会社ササコーポレーション Sasa Corporation Co., Ltd.	strategic	800.0K	¥1,596	+19.0%	¥1.3B ($8.2M)
2025-03-18	BUY	Market Buy	佐々香予子 Kayoko Sasa	activist	3.2M	¥1,596	+19.0%	¥5.0B ($32.5M)
2025-03-18	BUY	Market Buy	佐々幸恭 Yukiyasu Sasa	activist	383.4K	¥1,596	+19.0%	¥7M ($44K)
2025-03-18	BUY	Market Buy	ゆきかよ合同会社 Yuki Kayo LLC	strategic	100.0K	¥1,596	+19.0%	¥160M ($1.0M)
2024-05-22	BUY	Market Buy	佐々幸恭 Yukiyasu Sasa	activist	379.2K	¥1,247	+52.3%	¥13M ($81K)
2024-05-22	BUY	negotiated	佐々幸恭 Yukiyasu Sasa	activist	379.2K	¥1,247	+52.3%	¥13M ($81K)
2024-05-22	BUY	negotiated	ゆきかよ合同会社 Yuki Kayo LLC	strategic	100.0K	¥1,247	+52.3%	¥125M ($805K)
2024-05-22	BUY	negotiated	かん・ふみ合同会社 Kan-Fumi LLC	strategic	100.0K	¥1,247	+52.3%	¥125M ($805K)
2024-05-22	BUY	negotiated	株式会社ササコーポレーション Sasa Corporation Co., Ltd.	strategic	800.0K	¥1,247	+52.3%	¥998M ($6.4M)
2024-05-22	SELL	negotiated	佐々香予子 Kayoko Sasa	activist	3.2M	¥1,247	-52.3%	¥1.4B ($8.9M)
2024-05-22	BUY	Market Buy	ゆきかよ合同会社 Yuki Kayo LLC	strategic	100.0K	¥1,247	+52.3%	¥125M ($805K)
2024-05-22	BUY	Market Buy	かん・ふみ合同会社 Kan-Fumi LLC	strategic	100.0K	¥1,247	+52.3%	¥125M ($805K)
2024-05-22	BUY	Market Buy	株式会社ササコーポレーション Sasa Corporation Co., Ltd.	strategic	800.0K	¥1,247	+52.3%	¥998M ($6.4M)
2024-05-22	SELL	Market Buy	佐々香予子 Kayoko Sasa	activist	3.2M	¥1,247	-52.3%	¥1.4B ($8.9M)
2024-04-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	884.0K	¥1,270	+49.5%	¥210M ($1.4M)
2022-12-27	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	718.4K	¥1,199	+58.4%	¥861M ($5.6M)

Frequently asked questions

Who has been buying CMC Corporation stock?: 7 distinct investors have filed 7 disclosed large-shareholding filings in CMC Corporation (2185), most recently on 2025-09-26. 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 CMC Corporation have?: CMC Corporation has 7 buy-side and 2 sell-side disclosures on record, covering ¥440M ($2.8M) in total reported value, spanning 2022-12-27 to 2025-09-26.
Where does StockDrifts get CMC 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 CMC Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.