Who has been buying Monstar Lab, Inc. stock?

7 distinct investors have filed 7 disclosed large-shareholding filings in Monstar Lab, Inc. (5255), most recently on 2025-07-04. 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 Monstar Lab, Inc. have?

Monstar Lab, Inc. has 7 buy-side and 46 sell-side disclosures on record, covering ¥16.9B ($109.3M) in total reported value, spanning 2023-03-29 to 2025-07-04.

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.

Monstar Lab, Inc. 5255

Company

株式会社モンスターラボホールディングスMonstar Lab, Inc.

Investors

Buys

Total Value

¥16.9B ($109.3M)

Avg Return

-59.95%

Last Filing

2025-07-04

Monstar Lab, Inc. (5255) has 7 disclosed large-shareholding filings and 46 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥16.9B ($109.3M) in reported transaction value. The earliest filing StockDrifts holds for Monstar Lab, Inc. is dated 2023-03-29; the most recent is 2025-07-04. Across these filings the average return since disclosure is -59.95%, 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
2026-05-28	SELL	Market Buy	株式会社山陰合同銀行 The San-in Godo Bank,Ltd.	passive	35.1M	¥100	+12.0%	¥723M ($4.7M)
2026-05-28	BUY	Market Buy	株式会社山陰合同銀行 The San-in Godo Bank,Ltd.	passive	33.7M	¥100	-12.0%	¥3.4B ($21.7M)
2026-05-28	BUY	Market Buy	株式会社山陰合同銀行 The San-in Godo Bank,Ltd.	passive	33.7M	¥100	-	¥3.4B ($21.7M)
2025-07-04	SELL	unknown	鮄川宏樹 Hiroki Inagawa	activist	5.5M	¥168	+47.6%	¥202M ($1.3M)
2025-07-04	BUY	unknown	鮄川宏樹 Hiroki Inagawa	activist	5.5M	¥168	-	¥202M ($1.3M)
2025-06-30	SELL	Market Buy	エボファンド Evo Fund	activist	3.0M	¥224	+60.7%	¥304M ($2.0M)
2025-06-30	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	¥224	-	-
2025-06-27	SELL	Market Buy	エボファンド Evo Fund	activist	4.4M	¥229	+61.6%	¥374M ($2.4M)
2025-06-27	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	¥229	-	-
2025-06-26	SELL	Market Buy	エボファンド Evo Fund	activist	6.1M	¥255	+65.5%	¥172M ($1.1M)
2025-06-26	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	¥255	-	-
2025-06-25	SELL	Market Buy	エボファンド Evo Fund	activist	6.8M	¥265	+66.8%	¥904M ($5.8M)
2025-06-25	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	¥265	-	-
2025-06-23	SELL	Market Buy	エボファンド Evo Fund	activist	10.6M	¥329	+73.3%	¥189M ($1.2M)
2025-06-23	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	¥329	-	-
2025-06-18	SELL	Market Buy	エボファンド Evo Fund	activist	11.3M	¥239	+63.2%	¥574M ($3.7M)
2025-06-18	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	¥239	-	-
2025-06-11	SELL	Market Buy	エボファンド Evo Fund	activist	14.0M	¥110	+20.0%	¥60M ($386K)
2025-06-11	SELL	Market Buy	エボファンド Evo Fund	activist	14.0M	¥110	+20.0%	¥60M ($386K)
2025-06-11	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	¥110	-	-
2025-06-11	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	¥110	-	-
2025-05-27	SELL	Market Buy	エボファンド Evo Fund	activist	14.7M	¥77	-14.3%	¥58M ($374K)
2025-05-27	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	-	-
2025-05-27	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	-	-
2025-05-27	SELL	Market Buy	エボファンド Evo Fund	activist	14.7M	¥77	-14.3%	¥58M ($374K)
2025-05-22	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	¥77	-	-
2025-05-22	SELL	Market Buy	エボファンド Evo Fund	activist	15.6M	¥77	-14.3%	¥30M ($192K)
2025-05-22	SELL	Market Buy	エボファンド Evo Fund	activist	15.6M	¥77	-14.3%	¥30M ($192K)
2025-05-22	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	¥77	-	-
2025-05-21	SELL	Market Buy	エボファンド Evo Fund	activist	16.8M	¥79	-11.4%	¥23M ($147K)
2025-05-21	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	¥79	-	-
2025-05-21	SELL	Market Buy	エボファンド Evo Fund	activist	16.8M	¥79	-11.4%	¥23M ($147K)
2025-05-21	SELL	Market Buy	エボファンド Evo Fund	activist	16.1M	¥79	-11.4%	¥44M ($283K)
2025-05-21	SELL	Market Buy	エボファンド Evo Fund	activist	16.1M	¥79	-11.4%	¥44M ($283K)
2025-05-21	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	¥79	-	-
2025-05-21	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	¥79	-	-
2025-05-21	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	¥79	-	-
2025-05-19	BUY	unknown	鮄川宏樹 Hiroki Inagawa	activist	5.2M	¥79	-	-
2025-05-09	SELL	unknown	鮄川宏樹 Hiroki Inagawa	activist	5.2M	¥74	-18.9%	¥182M ($1.2M)
2025-05-08	SELL	Market Buy	エボファンド Evo Fund	activist	17.2M	¥74	-18.9%	¥42M ($274K)
2025-05-08	SELL	Market Buy	エボファンド Evo Fund	activist	17.2M	¥74	-18.9%	¥42M ($274K)
2025-05-08	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	¥74	-	-
2025-05-08	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	¥74	-	-
2025-04-08	SELL	Market Buy	エボファンド Evo Fund	activist	17.9M	¥64	-37.5%	¥35M ($224K)
2025-04-08	SELL	Market Buy	エボファンド Evo Fund	activist	17.9M	¥64	-37.5%	¥35M ($224K)
2025-04-08	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	¥64	-	-
2025-04-08	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	¥64	-	-
2025-03-27	SELL	Market Buy	エボファンド Evo Fund	activist	18.6M	¥82	-7.3%	¥71M ($456K)
2025-03-27	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	-	-
2025-03-25	SELL	Market Buy	エボファンド Evo Fund	activist	19.7M	¥81	-8.6%	¥39M ($251K)

Showing the 50 most recent of 104 filings.

Frequently asked questions

Who has been buying Monstar Lab, Inc. stock?: 7 distinct investors have filed 7 disclosed large-shareholding filings in Monstar Lab, Inc. (5255), most recently on 2025-07-04. 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 Monstar Lab, Inc. have?: Monstar Lab, Inc. has 7 buy-side and 46 sell-side disclosures on record, covering ¥16.9B ($109.3M) in total reported value, spanning 2023-03-29 to 2025-07-04.
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.