Who has been buying GRID Inc. stock?

5 distinct investors have filed 10 disclosed large-shareholding filings in GRID Inc. (5582), most recently on 2026-05-12. 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 GRID Inc. have?

GRID Inc. has 10 buy-side and 10 sell-side disclosures on record, covering ¥19.6B ($126.8M) in total reported value, spanning 2023-07-13 to 2026-05-12.

Where does StockDrifts get GRID 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.

GRID Inc. 5582

Company

株式会社グリッドGRID Inc.

Investors

Buys

Total Value

¥19.6B ($126.8M)

Avg Return

-30.57%

Last Filing

2026-05-12

GRID Inc. (5582) has 10 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥19.6B ($126.8M) in reported transaction value. The earliest filing StockDrifts holds for GRID Inc. is dated 2023-07-13; the most recent is 2026-05-12. 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 -30.57%, 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	unknown	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	385.9K	¥1,829	-5.1%	¥105M ($678K)
2026-05-26	SELL	unknown	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	442.6K	¥2,003	+12.2%	¥97M ($625K)
2026-05-12	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	124.9K	¥2,466	+14.7%	¥284M ($1.8M)
2026-04-27	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	491.0K	¥2,368	-12.3%	¥182M ($1.2M)
2026-01-13	SELL	subscription	寺島敬臣 TERASHIMA, Keishin	activist	204.0K	¥2,653	+8.3%	¥382M ($2.5M)
2025-11-21	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	238.9K	¥2,852	-14.7%	¥681M ($4.4M)
2025-06-06	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	218.0K	¥2,562	+5.0%	¥124M ($800K)
2025-06-06	BUY	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	218.0K	¥2,562	-5.0%	¥124M ($800K)
2025-02-12	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	265.5K	¥2,726	+10.8%	¥133M ($858K)
2025-02-06	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	409.5K	¥2,691	-9.6%	¥229M ($1.5M)
2025-01-15	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	314.1K	¥2,432	-0.0%	¥122M ($787K)
2025-01-10	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	364.4K	¥2,580	+5.7%	¥143M ($922K)
2024-11-25	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	419.4K	¥2,760	+11.8%	¥132M ($850K)
2024-11-15	BUY	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	466.8K	¥2,877	-15.4%	¥140M ($904K)
2024-11-15	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	466.8K	¥2,877	+15.4%	¥140M ($904K)
2024-11-05	SELL	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	515.6K	¥2,634	+7.6%	¥164M ($1.1M)
2024-06-20	SELL	unknown	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	321.6K	¥2,689	+9.5%	¥289M ($1.9M)
2024-04-04	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	428.7K	¥3,200	-24.0%	¥159M ($1.0M)
2024-01-16	BUY	subscription	寺島敬臣 TERASHIMA, Keishin	activist	360.0K	¥3,285	-25.9%	¥1.2B ($7.6M)
2024-01-16	BUY	subscription	寺島敬臣 TERASHIMA, Keishin	activist	360.0K	¥3,285	-25.9%	¥700M ($4.5M)
2024-01-16	BUY	subscription	寺島敬臣 TERASHIMA, Keishin	activist	360.0K	¥3,285	-25.9%	¥699M ($4.5M)
2023-10-05	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	378.6K	¥3,235	-24.8%	¥177M ($1.1M)
2023-09-06	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	323.7K	¥3,495	-30.4%	¥277M ($1.8M)
2023-08-04	BUY	unknown	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	235.5K	¥4,140	-41.2%	¥975M ($6.3M)
2023-07-13	BUY	Market Buy	三井物産株式会社 Mitsui & Co., LTD.	passive	552.0K	¥5,000	-51.3%	¥2.8B ($17.8M)
2023-07-13	BUY	subscription	寺島敬臣 TERASHIMA, Keishin	activist	597.0K	¥5,000	-51.3%	¥3.0B ($19.3M)
2023-07-13	BUY	unknown	株式会社We We Inc.	activist	2.6M	¥5,000	-51.3%	¥13.0B ($84.1M)

Frequently asked questions

Who has been buying GRID Inc. stock?: 5 distinct investors have filed 10 disclosed large-shareholding filings in GRID Inc. (5582), most recently on 2026-05-12. 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 GRID Inc. have?: GRID Inc. has 10 buy-side and 10 sell-side disclosures on record, covering ¥19.6B ($126.8M) in total reported value, spanning 2023-07-13 to 2026-05-12.
Where does StockDrifts get GRID 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 GRID Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.