Who has been buying CINC Corp. stock?

4 distinct investors have filed 9 disclosed large-shareholding filings in CINC Corp. (4378), most recently on 2025-03-28. 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 CINC Corp. have?

CINC Corp. has 9 buy-side and 15 sell-side disclosures on record, covering ¥8.8B ($56.5M) in total reported value, spanning 2021-10-26 to 2025-03-28.

Where does StockDrifts get CINC Corp. 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.

CINC Corp. 4378

Company

株式会社CINCCINC Corp.

Investors

Buys

Total Value

¥8.8B ($56.5M)

Avg Return

-80.99%

Last Filing

2025-03-28

CINC Corp. (4378) has 9 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥8.8B ($56.5M) in reported transaction value. The earliest filing StockDrifts holds for CINC Corp. is dated 2021-10-26; the most recent is 2025-03-28. 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 -80.99%, 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
2025-03-28	BUY	Market Buy	株式会社平企画 Taira Planning Co., Ltd.	strategic	140.0K	¥607	-24.6%	¥82M ($530K)
2025-03-28	SELL	Market Buy	平大志朗 Daishiro.Taira	strategic	0	¥607	+24.6%	¥112M ($722K)
2024-12-09	SELL	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥677	+32.4%	¥7M ($42K)
2024-12-09	SELL	unknown	平大志朗 Daishiro.Taira	activist	184.4K	¥677	+32.4%	¥3M ($18K)
2024-05-22	SELL	unknown	石松友典 Yusuke.Ishimatsu	activist	914.2K	¥665	+31.1%	¥7M ($47K)
2024-05-22	SELL	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥665	+31.1%	¥6M ($41K)
2024-05-22	SELL	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥665	+31.1%	¥10M ($65K)
2024-05-22	SELL	unknown	石松友典 Yusuke.Ishimatsu	activist	914.2K	¥665	+31.1%	¥11M ($74K)
2024-01-15	SELL	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥700	+34.6%	¥11M ($69K)
2024-01-15	SELL	unknown	石松友典 Yusuke.Ishimatsu	activist	914.2K	¥700	+34.6%	¥12M ($78K)
2022-10-04	SELL	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥1,252	+63.4%	¥6M ($38K)
2022-10-04	SELL	unknown	平大志朗 Daishiro.Taira	activist	184.4K	¥1,252	+63.4%	¥2M ($14K)
2022-09-30	BUY	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥1,202	-61.9%	¥559M ($3.6M)
2022-09-30	BUY	unknown	平大志朗 Daishiro.Taira	activist	184.4K	¥1,202	-61.9%	¥222M ($1.4M)
2021-11-25	BUY	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥3,255	-85.9%	¥1.5B ($9.8M)
2021-11-25	BUY	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥3,255	-85.9%	¥2.6B ($17.0M)
2021-11-25	BUY	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥3,255	-85.9%	¥1.5B ($9.8M)
2021-11-25	BUY	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥3,255	-85.9%	¥2.6B ($17.0M)
2021-11-25	SELL	unknown	石松友典 Yusuke.Ishimatsu	activist	914.2K	¥3,255	+85.9%	¥242M ($1.6M)
2021-11-25	SELL	unknown	平大志朗 Daishiro.Taira	activist	184.4K	¥3,255	+85.9%	¥161M ($1.0M)
2021-11-25	SELL	unknown	石松友典 Yusuke.Ishimatsu	activist	914.2K	¥3,255	+85.9%	¥242M ($1.6M)
2021-11-25	SELL	unknown	平大志朗 Daishiro.Taira	activist	184.4K	¥3,255	+85.9%	¥161M ($1.0M)
2021-10-26	BUY	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥3,830	-88.0%	¥1.8B ($11.5M)
2021-10-26	BUY	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥3,830	-88.0%	¥3.1B ($20.0M)
2021-10-26	BUY	unknown	株式会社平企画 Taira Planning Co., Ltd.	activist	465.0K	¥3,830	-88.0%	¥1.8B ($11.5M)
2021-10-26	BUY	unknown	株式会社CZ CZ Co., Ltd.	activist	808.1K	¥3,830	-88.0%	¥3.1B ($20.0M)
2021-10-26	BUY	unknown	石松友典 Yusuke.Ishimatsu	activist	988.5K	¥3,830	-88.0%	¥3.8B ($24.4M)
2021-10-26	BUY	unknown	平大志朗 Daishiro.Taira	activist	234.0K	¥3,830	-88.0%	¥896M ($5.8M)
2021-10-26	BUY	unknown	石松友典 Yusuke.Ishimatsu	activist	988.5K	¥3,830	-88.0%	¥3.8B ($24.4M)
2021-10-26	BUY	unknown	平大志朗 Daishiro.Taira	activist	234.0K	¥3,830	-88.0%	¥896M ($5.8M)

Frequently asked questions

Who has been buying CINC Corp. stock?: 4 distinct investors have filed 9 disclosed large-shareholding filings in CINC Corp. (4378), most recently on 2025-03-28. 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 CINC Corp. have?: CINC Corp. has 9 buy-side and 15 sell-side disclosures on record, covering ¥8.8B ($56.5M) in total reported value, spanning 2021-10-26 to 2025-03-28.
Where does StockDrifts get CINC Corp. 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 CINC Corp.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.