Who has been buying Artra Group Corporation stock?

4 distinct investors have filed 6 disclosed large-shareholding filings in Artra Group Corporation (6029), most recently on 2026-01-08. 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 Artra Group Corporation have?

Artra Group Corporation has 6 buy-side and 9 sell-side disclosures on record, covering ¥1.1B ($7.3M) in total reported value, spanning 2021-03-31 to 2026-01-08.

Where does StockDrifts get Artra Group Corporation 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.

Artra Group Corporation 6029

Company

アトラ株式会社Artra Group Corporation

Investors

Buys

Total Value

¥1.1B ($7.3M)

Avg Return

+6.77%

Last Filing

2026-01-08

Artra Group Corporation (6029) has 6 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.1B ($7.3M) in reported transaction value. The earliest filing StockDrifts holds for Artra Group Corporation is dated 2021-03-31; the most recent is 2026-01-08. 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 +6.77%, 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
2026-08-05	SELL	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	4.4M	¥198	+3.5%	¥22M ($141K)
2026-07-13	BUY	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	4.5M	¥197	-0.5%	¥893M ($5.8M)
2026-07-08	BUY	Market Buy	株式会社リメディア代表取締役杉野裕章 KABUSHIKIGAISHA REMEDIA	passive	514.4K	¥187	+3.7%	¥96M ($621K)
2026-07-08	BUY	Market Buy	株式会社リメディア代表取締役杉野裕章 KABUSHIKIGAISHA REMEDIA	passive	514.4K	¥187	+3.7%	¥96M ($621K)
2026-01-08	BUY	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	4.5M	¥176	+14.8%	¥798M ($5.1M)
2024-06-04	BUY	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	77.0K	¥163	+23.9%	¥10M ($61K)
2024-05-20	BUY	Market Buy	久世博之 Kyuse Hiroyuki	activist	837.3K	¥163	+23.9%	¥18M ($114K)
2024-05-20	BUY	unknown	久世博之 Kyuse Hiroyuki	activist	837.3K	¥163	+23.9%	¥18M ($115K)
2024-05-13	BUY	unknown	久世博之 Kyuse Hiroyuki	activist	717.3K	¥164	+23.2%	¥118M ($759K)
2024-05-13	BUY	unknown	久世博之 Kyuse Hiroyuki	activist	717.3K	¥164	+23.2%	¥118M ($759K)
2024-05-13	BUY	unknown	久世博之 Kyuse Hiroyuki	activist	717.3K	¥164	+23.2%	¥118M ($759K)
2023-11-21	SELL	unknown	一般社団法人みどり会 midorikai	other	2.2M	¥205	+1.5%	¥123M ($795K)
2023-11-21	BUY	unknown	一般社団法人みどり会 midorikai	other	2.2M	¥205	-1.5%	¥457M ($3.0M)
2023-11-17	SELL	Market Buy	蘇乾聞 SU CHIEN WEN	passive	336.8K	¥207	+2.4%	¥45M ($289K)
2023-11-17	BUY	Market Buy	蘇乾聞 SU CHIEN WEN	passive	336.8K	¥207	-2.4%	¥45M ($289K)
2023-11-17	SELL	unknown	一般社団法人みどり会 midorikai	other	2.2M	¥207	+2.4%	¥124M ($802K)
2023-11-02	BUY	Market Buy	蘇乾聞 SU CHIEN WEN	passive	536.8K	¥203	-0.5%	¥109M ($703K)
2023-11-02	BUY	Market Buy	蘇乾聞 SU CHIEN WEN	passive	536.8K	¥203	-0.5%	¥20M ($132K)
2023-09-25	SELL	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	2.3M	¥213	+5.2%	¥23M ($147K)
2023-09-20	BUY	Market Buy	蘇乾聞 SU CHIEN WEN	passive	637.0K	¥224	-9.8%	¥25M ($160K)
2023-09-06	BUY	unknown	蘇乾聞 SU CHIEN WEN	unknown	747.0K	¥255	-20.8%	¥190M ($1.2M)
2023-09-06	BUY	Market Buy	蘇乾聞 SU CHIEN WEN	passive	747.0K	¥255	-20.8%	¥26M ($169K)
2023-08-28	SELL	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	2.4M	¥270	+25.2%	¥24M ($153K)
2022-09-26	SELL	unknown	一般社団法人みどり会 midorikai	other	2.7M	¥185	-9.2%	¥90M ($583K)
2022-06-03	BUY	Market Buy	マイルストーン・キャピタル・マネジメント株式会社 Milestone Capital Management,Ltd.	passive	2.5M	¥204	-1.0%	¥510M ($3.3M)
2022-05-26	SELL	unknown	一般社団法人みどり会 midorikai	other	3.2M	¥200	-1.0%	¥118M ($759K)
2022-05-23	SELL	unknown	一般社団法人みどり会 midorikai	other	3.8M	¥211	+4.3%	¥3M ($20K)
2022-01-04	SELL	unknown	一般社団法人みどり会 midorikai	other	3.8M	¥289	+30.1%	¥123M ($790K)
2021-03-31	BUY	unknown	蘇乾聞 Su Chien Wen	activist	837.9K	¥361.881	-44.2%	¥303M ($2.0M)
2021-03-31	BUY	unknown	蘇乾聞 Su Chien Wen	activist	837.9K	¥361.881	-44.2%	¥303M ($2.0M)

Frequently asked questions

Who has been buying Artra Group Corporation stock?: 4 distinct investors have filed 6 disclosed large-shareholding filings in Artra Group Corporation (6029), most recently on 2026-01-08. 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 Artra Group Corporation have?: Artra Group Corporation has 6 buy-side and 9 sell-side disclosures on record, covering ¥1.1B ($7.3M) in total reported value, spanning 2021-03-31 to 2026-01-08.
Where does StockDrifts get Artra Group Corporation 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 Artra Group Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.