Who has been buying gremz,Inc. stock?

6 distinct investors have filed 10 disclosed large-shareholding filings in gremz,Inc. (3150), most recently on 2025-11-17. 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 gremz,Inc. have?

gremz,Inc. has 10 buy-side and 6 sell-side disclosures on record, covering ¥3.1B ($19.9M) in total reported value, spanning 2021-11-25 to 2025-11-17.

Where does StockDrifts get gremz,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.

gremz,Inc. 3150

Company

株式会社グリムスgremz,Inc.

Investors

Buys

Total Value

¥3.1B ($19.9M)

Avg Return

+33.21%

Last Filing

2025-11-17

gremz,Inc. (3150) has 10 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥3.1B ($19.9M) in reported transaction value. The earliest filing StockDrifts holds for gremz,Inc. is dated 2021-11-25; the most recent is 2025-11-17. 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 +33.21%, 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
2026-06-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.7M	¥2,420	+7.3%	¥583M ($3.8M)
2025-11-17	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.5M	¥2,370	+22.8%	¥604M ($3.9M)
2025-10-21	BUY	unknown	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	492.8K	¥2,370	+22.8%	¥6M ($36K)
2025-10-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	416.8K	¥2,370	-22.8%	¥954M ($6.2M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,502	+16.3%	¥42M ($269K)
2025-09-19	BUY	unknown	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	490.7K	¥2,458	+18.4%	¥1.2B ($7.8M)
2025-09-19	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	819.3K	¥2,458	+18.4%	¥2.0B ($13.0M)
2025-07-10	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,474	+17.6%	¥3.0B ($19.1M)
2025-07-03	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	1.1M	¥2,353	-23.7%	¥706M ($4.6M)
2025-04-21	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	1.4M	¥2,277	-27.8%	¥662M ($4.3M)
2025-02-27	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	1.6M	¥2,221	-31.0%	¥772M ($5.0M)
2023-03-17	BUY	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	2.0M	¥2,324	+25.2%	¥4.6B ($29.5M)
2023-03-17	SELL	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	0	¥2,324	-25.2%	¥49M ($319K)
2023-02-16	SELL	unknown	田中政臣 MASAOMI TANAKA	activist	10.8M	¥2,459	-18.3%	¥1.2B ($7.9M)
2022-12-01	BUY	Market Buy	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	2.1M	¥1,830	+59.0%	¥469M ($3.0M)
2022-05-12	BUY	Market Buy	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	1.9M	¥1,527	+90.6%	¥409M ($2.6M)
2022-01-27	BUY	Market Buy	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	1.6M	¥1,823	+59.6%	¥612M ($4.0M)
2021-11-25	BUY	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	1.3M	¥2,729	+6.6%	¥3.5B ($22.3M)

Frequently asked questions

Who has been buying gremz,Inc. stock?: 6 distinct investors have filed 10 disclosed large-shareholding filings in gremz,Inc. (3150), most recently on 2025-11-17. 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 gremz,Inc. have?: gremz,Inc. has 10 buy-side and 6 sell-side disclosures on record, covering ¥3.1B ($19.9M) in total reported value, spanning 2021-11-25 to 2025-11-17.
Where does StockDrifts get gremz,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 gremz,Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.