Who has been buying GRCS Inc. stock?

6 distinct investors have filed 6 disclosed large-shareholding filings in GRCS Inc. (9250), most recently on 2026-02-26. 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 GRCS Inc. have?

GRCS Inc. has 6 buy-side and 13 sell-side disclosures on record, covering ¥3.7B ($24.1M) in total reported value, spanning 2021-11-25 to 2026-02-26.

Where does StockDrifts get GRCS 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.

GRCS Inc. 9250

Company

株式会社GRCSGRCS Inc.

Investors

Buys

Total Value

¥3.7B ($24.1M)

Avg Return

-62.70%

Last Filing

2026-02-26

GRCS Inc. (9250) has 6 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥3.7B ($24.1M) in reported transaction value. The earliest filing StockDrifts holds for GRCS Inc. is dated 2021-11-25; the most recent is 2026-02-26. 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 -62.70%, 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
2026-05-15	SELL	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	61.7K	¥915	-3.0%	¥195M ($1.3M)
2026-02-26	BUY	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥1,121	-4.4%	¥5M ($32K)
2026-02-26	SELL	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥1,121	+4.4%	¥5M ($32K)
2026-02-09	BUY	Market Buy	株式会社Fixstars Investment Fixstars Investment Corporation	passive	145.0K	¥1,116	-3.9%	¥162M ($1.0M)
2026-01-27	SELL	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	295.7K	¥1,240	+13.6%	¥26M ($166K)
2025-11-17	SELL	unknown	合同会社Trojans Trojans LLC	activist	374.0K	¥1,046	-2.5%	¥42M ($270K)
2025-11-17	BUY	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥1,046	+2.5%	¥73M ($473K)
2024-09-06	SELL	unknown	合同会社Trojans Trojans LLC	activist	414.0K	¥1,420	+24.5%	¥29M ($190K)
2024-09-06	SELL	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥1,420	+24.5%	¥5M ($32K)
2024-05-16	BUY	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	320.0K	¥1,712	-37.4%	¥548M ($3.5M)
2024-02-02	SELL	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥1,745	+38.6%	¥229K ($1K)
2024-02-02	SELL	unknown	合同会社Trojans Trojans LLC	activist	414.0K	¥1,745	+38.6%	¥63M ($407K)
2023-08-28	SELL	unknown	合同会社Trojans Trojans LLC	activist	450.0K	¥2,706	+60.4%	¥4M ($25K)
2023-08-28	SELL	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥2,706	+60.4%	¥355K ($2K)
2023-06-07	BUY	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥2,558	-58.1%	¥212M ($1.4M)
2023-02-08	SELL	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥2,789	+61.6%	¥365K ($2K)
2022-07-27	SELL	unknown	合同会社Trojans Trojans LLC	activist	450.0K	¥2,902	+63.1%	¥760K ($5K)
2022-07-27	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	250.0K	¥2,902	-63.1%	¥726M ($4.7M)
2022-07-27	SELL	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥2,902	+63.1%	¥380K ($2K)
2022-07-27	BUY	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥2,902	-63.1%	¥241M ($1.6M)
2021-12-02	BUY	unknown	合同会社Trojans Trojans LLC	activist	450.0K	¥7,860	-86.4%	¥3.5B ($22.8M)
2021-12-02	SELL	unknown	佐々木慈和 Sasaki Yoshikazu	activist	70.1K	¥7,860	+86.4%	¥384M ($2.5M)
2021-11-25	BUY	unknown	佐々木慈和 Sasaki Yoshikazu	activist	119.0K	¥11,400	-90.6%	¥1.4B ($8.8M)
2021-11-25	BUY	negotiated	塚本拓也 Tsukamoto Takuya	activist	83.0K	¥11,400	-90.6%	¥946M ($6.1M)
2021-11-25	BUY	unknown	合同会社Trojans Trojans LLC	activist	450.0K	¥11,400	-90.6%	¥5.1B ($33.1M)

Frequently asked questions

Who has been buying GRCS Inc. stock?: 6 distinct investors have filed 6 disclosed large-shareholding filings in GRCS Inc. (9250), most recently on 2026-02-26. 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 GRCS Inc. have?: GRCS Inc. has 6 buy-side and 13 sell-side disclosures on record, covering ¥3.7B ($24.1M) in total reported value, spanning 2021-11-25 to 2026-02-26.
Where does StockDrifts get GRCS 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 GRCS Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.