Who has been buying Artner Co.,Ltd. stock?

2 distinct investors have filed 4 disclosed large-shareholding filings in Artner Co.,Ltd. (2163), most recently on 2026-02-20. 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 Artner Co.,Ltd. have?

Artner Co.,Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥212M ($1.4M) in total reported value, spanning 2022-04-13 to 2026-02-20.

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.

Artner Co.,Ltd. 2163

Company

株式会社アルトナーArtner Co.,Ltd.

Investors

Buys

Total Value

¥212M ($1.4M)

Avg Return

+28.82%

Last Filing

2026-02-20

Artner Co.,Ltd. (2163) has 4 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥212M ($1.4M) in reported transaction value. The earliest filing StockDrifts holds for Artner Co.,Ltd. is dated 2022-04-13; the most recent is 2026-02-20. Across these filings the average return since disclosure is +28.82%, 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
2026-06-12	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	342.5K	¥1,906	-	-
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	261.4K	¥1,906	-	-
2026-06-12	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	40.7K	¥1,906	-	-
2026-06-10	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	261.4K	¥1,940	-51.1%	¥202M ($1.3M)
2026-06-10	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	40.7K	¥1,940	-51.1%	¥2M ($13K)
2026-06-10	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	342.5K	¥1,940	+51.1%	¥2M ($13K)
2026-06-08	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	343.6K	¥1,902	-50.1%	¥653M ($4.2M)
2026-06-08	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	157.8K	¥1,902	-50.1%	¥300M ($1.9M)
2026-06-08	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	39.6K	¥1,902	-50.1%	¥75M ($486K)
2026-02-20	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	644.6K	¥2,012	-	-
2026-02-20	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	644.6K	¥2,012	-	-
2026-02-06	BUY	Market Buy	エフエムアールエルエルシー（FMR LLC） FMR LLC	other	644.6K	¥2,061	-54.0%	¥212M ($1.4M)
2026-02-06	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	644.6K	¥2,061	-54.0%	¥212M ($1.4M)
2025-02-21	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	541.0K	¥1,760	-46.1%	¥952M ($6.1M)
2025-02-21	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	541.0K	¥1,760	-46.1%	¥952M ($6.1M)
2025-02-07	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	499.6K	¥1,808	+47.5%	¥100M ($645K)
2024-08-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	555.3K	¥1,857	+48.9%	¥12M ($76K)
2024-08-07	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	560.9K	¥1,677	-43.4%	¥14M ($92K)
2022-10-21	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	552.3K	¥1,006	-5.7%	¥556M ($3.6M)
2022-05-19	SELL	unknown	株式会社関口興業社 Sekiguchikougyousya	strategic	2.1M	¥836	-13.5%	¥276M ($1.8M)
2022-04-22	SELL	unknown	株式会社関口興業社 Sekiguchikougyousya	strategic	2.5M	¥823	-15.3%	¥1.5B ($9.8M)
2022-04-13	BUY	unknown	株式会社関口興業社 Sekiguchikougyousya	strategic	4.3M	¥842	-	-

Frequently asked questions

Who has been buying Artner Co.,Ltd. stock?: 2 distinct investors have filed 4 disclosed large-shareholding filings in Artner Co.,Ltd. (2163), most recently on 2026-02-20. 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 Artner Co.,Ltd. have?: Artner Co.,Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥212M ($1.4M) in total reported value, spanning 2022-04-13 to 2026-02-20.
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.