Who has been buying R. C. Core Co., Ltd. stock?

7 distinct investors have filed 7 disclosed large-shareholding filings in R. C. Core Co., Ltd. (7837), most recently on 2025-11-10. 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 R. C. Core Co., Ltd. have?

R. C. Core Co., Ltd. has 7 buy-side and 4 sell-side disclosures on record, covering ¥765M ($4.9M) in total reported value, spanning 2024-03-07 to 2025-11-10.

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.

R. C. Core Co., Ltd. 7837

Company

株式会社アールシーコアR. C. Core Co., Ltd.

Investors

Buys

Total Value

¥765M ($4.9M)

Avg Return

-28.22%

Last Filing

2025-11-10

R. C. Core Co., Ltd. (7837) has 7 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥765M ($4.9M) in reported transaction value. The earliest filing StockDrifts holds for R. C. Core Co., Ltd. is dated 2024-03-07; the most recent is 2025-11-10. Across these filings the average return since disclosure is -28.22%, 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
2025-11-10	BUY	negotiated	谷秋子 Tani Akiko	activist	233.5K	¥412	-	¥96M ($621K)
2025-11-10	BUY	negotiated	谷秋子 Tani Akiko	activist	233.5K	¥412	-	¥748K ($5K)
2025-10-20	BUY	unknown	旭化成ホームズ株式会社 ASAHI KASEI HOMES CORPORATION	other	635.1K	¥636	-44.3%	¥404M ($2.6M)
2025-10-20	SELL	negotiated	二木敦士 Futagi Atsushi	activist	91.4K	¥636	+44.3%	¥115M ($745K)
2025-10-20	SELL	negotiated	安田周世 Yasuda Shusei	activist	0	¥636	+44.3%	¥174M ($1.1M)
2025-10-20	SELL	negotiated	二木渉 Futagi Wataru	activist	92.1K	¥636	+44.3%	¥115M ($741K)
2025-07-11	BUY	negotiated	安田周世 Syusei Yasuda	activist	272.9K	¥410	-13.7%	¥112M ($722K)
2025-07-11	BUY	negotiated	二木敦士 Atsushi Futagi	activist	272.8K	¥410	-13.7%	¥112M ($722K)
2025-07-11	BUY	negotiated	二木渉 Wataru Futagi	activist	272.8K	¥410	-13.7%	¥112M ($722K)
2025-05-23	SELL	negotiated	谷秋子 Akiko Tani	activist	231.9K	¥379	+6.6%	¥21M ($133K)
2024-08-28	BUY	Market Buy	二木浩三 KOZO FUTAGI	activist	816.6K	¥474	-25.3%	¥3M ($17K)
2024-05-09	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	297.9K	¥474	-25.3%	¥23M ($148K)
2024-03-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	249.3K	¥443	-20.1%	¥110M ($713K)

Frequently asked questions

Who has been buying R. C. Core Co., Ltd. stock?: 7 distinct investors have filed 7 disclosed large-shareholding filings in R. C. Core Co., Ltd. (7837), most recently on 2025-11-10. 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 R. C. Core Co., Ltd. have?: R. C. Core Co., Ltd. has 7 buy-side and 4 sell-side disclosures on record, covering ¥765M ($4.9M) in total reported value, spanning 2024-03-07 to 2025-11-10.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.