Who has been buying Ridge-i Inc. stock?

7 distinct investors have filed 8 disclosed large-shareholding filings in Ridge-i Inc. (5572), most recently on 2025-10-07. 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 Ridge-i Inc. have?

Ridge-i Inc. has 8 buy-side and 25 sell-side disclosures on record, covering ¥9.3B ($59.7M) in total reported value, spanning 2023-05-02 to 2025-10-07.

Where does StockDrifts get Ridge-i 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.

Ridge-i Inc. 5572

Company

株式会社Ridge-iRidge-i Inc.

Investors

Buys

Total Value

¥9.3B ($59.7M)

Avg Return

-23.42%

Last Filing

2025-10-07

Ridge-i Inc. (5572) has 8 disclosed large-shareholding filings and 25 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥9.3B ($59.7M) in reported transaction value. The earliest filing StockDrifts holds for Ridge-i Inc. is dated 2023-05-02; the most recent is 2025-10-07. 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 -23.42%, 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
2026-06-17	SELL	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	0	¥2,823	+8.3%	¥698M ($4.5M)
2025-10-07	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	974.0K	¥2,733	-16.6%	¥904M ($5.8M)
2025-10-07	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	31.6K	¥2,733	+16.6%	¥12M ($76K)
2025-10-06	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,774	+17.8%	¥179M ($1.2M)
2025-10-06	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	32.3K	¥2,774	+17.8%	¥20M ($126K)
2025-10-06	BUY	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,774	-17.8%	¥1.8B ($11.6M)
2025-10-06	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,774	+17.8%	¥179M ($1.2M)
2025-10-06	BUY	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,774	-17.8%	¥1.8B ($11.6M)
2025-10-06	BUY	unknown	柳原尚史 Takashi Yanagihara	activist	467.4K	¥2,774	-17.8%	¥1.3B ($8.4M)
2025-10-06	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	467.4K	¥2,774	+17.8%	¥1.9B ($12.3M)
2025-10-06	BUY	unknown	柳原尚史 Takashi Yanagihara	activist	467.4K	¥2,774	-17.8%	¥1.3B ($8.4M)
2025-10-06	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	584.0K	¥2,774	-17.8%	¥1.6B ($10.5M)
2025-10-06	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	467.4K	¥2,774	+17.8%	¥1.9B ($12.3M)
2025-09-26	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	39.4K	¥2,762	+17.5%	¥51M ($327K)
2025-09-26	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	584.0K	¥2,762	-17.5%	¥1.6B ($10.4M)
2025-09-22	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	57.8K	¥2,820	-19.2%	¥163M ($1.1M)
2025-09-22	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,820	+19.2%	¥4M ($29K)
2025-09-22	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,820	+19.2%	¥3M ($21K)
2025-09-22	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,820	+19.2%	¥3M ($21K)
2025-09-22	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,820	+19.2%	¥11M ($71K)
2025-09-22	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	584.0K	¥2,820	-19.2%	¥1.6B ($10.6M)
2025-09-22	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,820	+19.2%	¥75M ($484K)
2025-09-22	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,820	+19.2%	¥4M ($29K)
2025-09-22	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,820	+19.2%	¥75M ($484K)
2025-09-22	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,820	+19.2%	¥11M ($71K)
2025-05-12	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	648.3K	¥2,596	+12.2%	¥34M ($221K)
2025-05-12	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	658.3K	¥2,596	+12.2%	¥8M ($52K)
2025-05-12	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,596	+12.2%	¥109M ($703K)
2025-05-12	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,596	+12.2%	¥129M ($833K)
2025-01-08	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	658.3K	¥2,345	+2.8%	¥34M ($222K)
2025-01-08	SELL	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	658.3K	¥2,345	+2.8%	¥34M ($222K)
2025-01-08	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,345	+2.8%	¥133M ($860K)
2025-01-08	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.1M	¥2,345	+2.8%	¥133M ($860K)
2024-03-05	SELL	unknown	小松平佳 Takayoshi Komatsu	activist	185.0K	¥3,000	+24.0%	¥360M ($2.3M)
2024-01-11	BUY	unknown	小松平佳 Takayoshi Komatsu	activist	305.0K	¥1,666	+36.8%	¥508M ($3.3M)
2023-05-29	BUY	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	660.0K	¥3,535	-35.5%	¥2.3B ($15.1M)
2023-05-29	SELL	unknown	柳原尚史 Takashi Yanagihara	activist	1.2M	¥3,535	+35.5%	¥314M ($2.0M)
2023-05-08	BUY	unknown	小松平佳 Takayoshi Komatsu	activist	305.0K	¥3,575	-36.3%	¥1.1B ($7.0M)
2023-05-08	BUY	unknown	小松平佳 Takayoshi Komatsu	activist	305.0K	¥3,575	-36.3%	¥1.1B ($7.0M)
2023-05-02	BUY	unknown	株式会社柳原ホールディングス Yanagihara Holdings Co., Ltd.	activist	660.0K	¥3,000	-24.0%	¥2.0B ($12.8M)
2023-05-02	BUY	negotiated	株式会社バルカー VALQUA,LTD.	strategic	416.7K	¥3,000	-24.0%	¥1.2B ($8.1M)
2023-05-02	BUY	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	217.4K	¥3,000	-24.0%	¥652M ($4.2M)
2023-05-02	BUY	unknown	柳原尚史 Takashi Yanagihara	activist	1.2M	¥3,000	-24.0%	¥3.7B ($24.0M)

Frequently asked questions

Who has been buying Ridge-i Inc. stock?: 7 distinct investors have filed 8 disclosed large-shareholding filings in Ridge-i Inc. (5572), most recently on 2025-10-07. 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 Ridge-i Inc. have?: Ridge-i Inc. has 8 buy-side and 25 sell-side disclosures on record, covering ¥9.3B ($59.7M) in total reported value, spanning 2023-05-02 to 2025-10-07.
Where does StockDrifts get Ridge-i 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 Ridge-i Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.