Who has been buying Oriental Chain Mfg. Co., Ltd. stock?

9 distinct investors have filed 11 disclosed large-shareholding filings in Oriental Chain Mfg. Co., Ltd. (6380), most recently on 2026-05-14. 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 Oriental Chain Mfg. Co., Ltd. have?

Oriental Chain Mfg. Co., Ltd. has 11 buy-side and 5 sell-side disclosures on record, covering ¥8.3B ($53.6M) in total reported value, spanning 2021-04-15 to 2026-05-14.

Where does StockDrifts get Oriental Chain Mfg. Co., Ltd. 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.

Oriental Chain Mfg. Co., Ltd. 6380

Company

オリエンタルチエン工業株式会社Oriental Chain Mfg. Co., Ltd.

Investors

Buys

Total Value

¥8.3B ($53.6M)

Avg Return

+123.62%

Last Filing

2026-05-14

Oriental Chain Mfg. Co., Ltd. (6380) has 11 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥8.3B ($53.6M) in reported transaction value. The earliest filing StockDrifts holds for Oriental Chain Mfg. Co., Ltd. is dated 2021-04-15; the most recent is 2026-05-14. 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 +123.62%, 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
2026-06-15	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥4,735	-8.2%	¥7.1B ($45.8M)
2026-06-15	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥4,735	-8.2%	¥7.1B ($45.8M)
2026-06-02	SELL	unknown	Maximus合同会社	other	45.8K	¥4,935	+5.5%	¥21M ($133K)
2026-06-02	SELL	unknown	山下卓宏	other	33.5K	¥4,935	+5.5%	¥81M ($525K)
2026-05-27	BUY	unknown	Maximus合同会社	other	50.0K	¥4,910	-3.6%	¥246M ($1.6M)
2026-05-27	BUY	unknown	山下卓宏	other	50.0K	¥4,910	-3.6%	¥246M ($1.6M)
2026-05-27	BUY	unknown	Maximus合同会社	other	50.0K	¥4,910	-3.6%	¥246M ($1.6M)
2026-05-27	BUY	unknown	山下卓宏	other	50.0K	¥4,910	-3.6%	¥246M ($1.6M)
2026-05-22	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥5,090	-7.0%	¥7.6B ($49.3M)
2026-05-22	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥5,090	-7.0%	¥7.6B ($49.3M)
2026-05-20	SELL	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	600.0K	¥5,200	+7.8%	¥289M ($1.9M)
2026-05-20	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	600.0K	¥5,200	-7.8%	¥3.1B ($20.1M)
2026-05-18	BUY	unknown	Maximus合同会社	other	50.0K	¥5,040	-4.9%	¥252M ($1.6M)
2026-05-18	BUY	unknown	山下卓宏	other	50.0K	¥5,040	-4.9%	¥252M ($1.6M)
2026-05-18	BUY	unknown	Maximus合同会社	other	50.0K	¥5,040	-4.9%	¥252M ($1.6M)
2026-05-18	BUY	unknown	山下卓宏	other	50.0K	¥5,040	-4.9%	¥252M ($1.6M)
2026-05-14	BUY	unknown	Maximus合同会社	other	100.0K	¥4,860	+4.1%	¥486M ($3.1M)
2026-05-14	BUY	unknown	山下卓宏	other	100.0K	¥4,860	+4.1%	¥486M ($3.1M)
2026-05-14	BUY	unknown	Maximus合同会社	other	100.0K	¥4,860	+4.1%	¥486M ($3.1M)
2026-05-14	BUY	unknown	山下卓宏	other	100.0K	¥4,860	+4.1%	¥486M ($3.1M)
2026-05-13	SELL	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥4,480	-12.9%	¥134M ($864K)
2026-05-13	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥4,480	+12.9%	¥134M ($864K)
2026-05-12	BUY	unknown	山下卓宏 Takahiro Yamashita	other	100.0K	¥4,240	+19.3%	¥424M ($2.7M)
2026-05-12	BUY	unknown	山下卓宏 Takahiro Yamashita	other	100.0K	¥4,240	+19.3%	¥424M ($2.7M)
2026-05-11	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	600.0K	¥4,185	+20.9%	¥233M ($1.5M)
2026-05-11	SELL	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	600.0K	¥4,185	-20.9%	¥233M ($1.5M)
2026-04-27	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥3,885	+36.9%	¥5.8B ($37.6M)
2026-02-24	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥3,480	+2.3%	¥5.2B ($33.7M)
2026-02-05	BUY	Market Buy	株式会社Ｕｃａｐｉ Ucapi	passive	1.5M	¥3,140	+13.4%	¥4.7B ($30.4M)
2026-01-28	BUY	Market Buy	株式会社Ucapi Ucapi	passive	1.5M	¥3,530	+0.8%	¥5.3B ($34.2M)
2026-01-28	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	600.0K	¥3,530	+0.8%	¥2.1B ($13.7M)
2026-01-09	BUY	Market Buy	ORCHID PLUS PTE. LTD.	passive	90.0K	¥3,400	+4.7%	¥306M ($2.0M)
2026-01-05	SELL	negotiated	合同会社シーディーワン代表社員杉山敏之 CD one LLP	strategic	165.7K	¥3,115	-14.3%	¥281M ($1.8M)
2025-02-05	BUY	Market Buy	合同会社シーディーワン代表社員杉山敏之 CD one LLP	strategic	255.7K	¥1,937	+83.8%	¥51M ($326K)
2025-01-24	BUY	negotiated	合同会社シーディーワン代表社員杉山敏之 CD one LLP	strategic	229.6K	¥1,965	+81.2%	¥132M ($850K)
2025-01-24	BUY	negotiated	合同会社シーディーワン CD One LLP	activist	162.5K	¥1,965	+81.2%	¥319M ($2.1M)
2024-07-04	BUY	Market Buy	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	138.3K	¥1,955	+82.1%	¥41M ($263K)
2024-07-04	BUY	unknown	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	138.3K	¥1,955	+82.1%	¥41M ($263K)
2023-04-03	BUY	Market Buy	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	117.5K	¥992	+258.9%	¥24M ($157K)
2023-01-27	BUY	Market Buy	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	93.0K	¥959	+271.2%	¥17M ($110K)
2022-12-07	BUY	Market Buy	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	75.2K	¥841	+323.3%	¥63M ($408K)
2022-12-07	BUY	Market Buy	片山チエン株式会社 KATAYAMA CHAIN CO.,LTD.	activist	75.2K	¥841	+323.3%	¥63M ($408K)
2022-10-21	SELL	Market Buy	平松裕将 Hiramatsu Hiromasa	passive	52.2K	¥861	-313.5%	¥19M ($126K)
2022-10-13	BUY	Market Buy	平松裕将 Hiramatsu Hiromasa	passive	74.8K	¥1,045	+240.7%	¥78M ($505K)
2021-04-15	SELL	unknown	オリエンタルチエン取引先持株会理事長疋田正一 Shoichi Hikida	strategic	19	¥695	-412.2%	¥158M ($1.0M)

Frequently asked questions

Who has been buying Oriental Chain Mfg. Co., Ltd. stock?: 9 distinct investors have filed 11 disclosed large-shareholding filings in Oriental Chain Mfg. Co., Ltd. (6380), most recently on 2026-05-14. 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 Oriental Chain Mfg. Co., Ltd. have?: Oriental Chain Mfg. Co., Ltd. has 11 buy-side and 5 sell-side disclosures on record, covering ¥8.3B ($53.6M) in total reported value, spanning 2021-04-15 to 2026-05-14.
Where does StockDrifts get Oriental Chain Mfg. Co., Ltd. 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 Oriental Chain Mfg. Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.