Who has been buying Ribomic Inc. stock?

5 distinct investors have filed 4 disclosed large-shareholding filings in Ribomic Inc. (4591), most recently on 2026-05-13. 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 Ribomic Inc. have?

Ribomic Inc. has 4 buy-side and 37 sell-side disclosures on record, covering ¥4.3B ($27.7M) in total reported value, spanning 2021-12-17 to 2026-05-13.

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.

Ribomic Inc. 4591

Company

株式会社リボミックRibomic Inc.

Investors

Buys

Total Value

¥4.3B ($27.7M)

Avg Return

-23.56%

Last Filing

2026-05-13

Ribomic Inc. (4591) has 4 disclosed large-shareholding filings and 37 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥4.3B ($27.7M) in reported transaction value. The earliest filing StockDrifts holds for Ribomic Inc. is dated 2021-12-17; the most recent is 2026-05-13. Across these filings the average return since disclosure is -23.56%, 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
2026-06-22	SELL	private	エボファンド Evo Fund	activist	21.9M	¥62	-22.6%	¥21M ($138K)
2026-06-22	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥62	-	-
2026-06-03	SELL	private	エボファンド Evo Fund	activist	22.4M	¥67	-13.4%	¥40M ($256K)
2026-06-03	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥67	-	-
2026-05-13	SELL	private	エボファンド Evo Fund	activist	23.2M	¥78	+2.6%	¥21M ($133K)
2026-05-13	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥78	-	-
2026-04-21	SELL	private	エボファンド Evo Fund	activist	23.5M	¥86	+11.6%	¥2M ($12K)
2026-04-21	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥86	-	-
2026-04-21	SELL	private	エボファンド Evo Fund	activist	23.5M	¥86	+11.6%	¥2M ($12K)
2026-04-21	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥86	-	-
2026-04-06	SELL	private	エボファンド Evo Fund	activist	23.5M	¥91	+16.5%	¥64M ($415K)
2026-04-06	BUY	private	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥91	-	-
2025-12-17	SELL	Market Buy	エボファンド Evo Fund	activist	24.5M	¥73	-4.1%	¥11M ($69K)
2025-12-17	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥73	-	-
2025-12-16	SELL	Market Buy	エボファンド Evo Fund	activist	24.7M	¥77	+1.3%	¥58M ($374K)
2025-12-16	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥77	-	-
2025-12-05	SELL	Market Buy	エボファンド Evo Fund	activist	25.7M	¥77	+1.3%	¥31M ($199K)
2025-12-05	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥77	-	-
2025-11-18	SELL	Market Buy	エボファンド Evo Fund	activist	26.3M	¥82	+7.3%	¥47M ($306K)
2025-11-18	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥82	-	-
2025-09-12	SELL	Market Buy	エボファンド Evo Fund	activist	27.2M	¥97	+21.6%	¥63M ($409K)
2025-09-12	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥97	-	-
2025-09-09	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥106	-	-
2025-09-09	SELL	Market Buy	エボファンド Evo Fund	activist	28.1M	¥106	+28.3%	¥81M ($520K)
2025-09-04	SELL	Market Buy	エボファンド Evo Fund	activist	29.3M	¥106	+28.3%	¥9M ($60K)
2025-09-04	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥106	-	-
2025-09-02	SELL	Market Buy	エボファンド Evo Fund	activist	29.4M	¥113	+32.7%	¥62M ($403K)
2025-09-02	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥113	-	-
2025-08-28	SELL	Market Buy	エボファンド Evo Fund	activist	30.3M	¥104	+26.9%	¥86M ($554K)
2025-08-28	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥104	-	-
2025-08-19	BUY	Market Buy	エボファンド Evo Fund	activist	31.6M	¥109	-	-
2025-08-19	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥109	-	-
2025-08-18	BUY	Market Buy	エボファンド Evo Fund	activist	31.6M	¥108	-29.6%	¥3.4B ($22.0M)
2025-08-18	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥108	-29.6%	-
2025-01-22	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.2M	¥85	+10.6%	¥152M ($983K)
2025-01-10	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.2M	¥88	+13.6%	¥26M ($166K)
2024-12-06	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.5M	¥79	+3.8%	¥60M ($390K)
2024-08-28	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.3M	¥99	+23.2%	¥40M ($261K)
2024-08-15	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.4M	¥92	+17.4%	¥42M ($269K)
2024-07-31	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.9M	¥102	+25.5%	¥92M ($593K)
2024-07-24	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	6.1M	¥102	+25.5%	¥38M ($247K)
2024-07-09	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	6.6M	¥93	+18.3%	¥128M ($824K)
2024-04-23	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	8.4M	¥83	+8.4%	¥4M ($29K)
2024-04-02	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	8.6M	¥88	+13.6%	¥40M ($255K)
2024-03-14	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	9.2M	¥95	-20.0%	¥876M ($5.7M)
2022-12-07	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.6K	¥210	+63.8%	¥5M ($33K)
2022-11-30	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.0M	¥233	+67.4%	¥384M ($2.5M)
2022-11-29	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	5.1M	¥237	+67.9%	¥123M ($795K)
2022-11-28	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	5.9M	¥219	+65.3%	¥164M ($1.1M)
2022-11-02	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	7.4M	¥164	-53.7%	¥1.2B ($7.8M)

Showing the 50 most recent of 63 filings.

Frequently asked questions

Who has been buying Ribomic Inc. stock?: 5 distinct investors have filed 4 disclosed large-shareholding filings in Ribomic Inc. (4591), most recently on 2026-05-13. 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 Ribomic Inc. have?: Ribomic Inc. has 4 buy-side and 37 sell-side disclosures on record, covering ¥4.3B ($27.7M) in total reported value, spanning 2021-12-17 to 2026-05-13.
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.