Who has been buying OXIDE Corporation stock?

9 distinct investors have filed 10 disclosed large-shareholding filings in OXIDE Corporation (6521), most recently on 2026-05-08. 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 OXIDE Corporation have?

OXIDE Corporation has 10 buy-side and 13 sell-side disclosures on record, covering ¥9.7B ($62.6M) in total reported value, spanning 2021-04-06 to 2026-05-08.

Where does StockDrifts get OXIDE 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.

OXIDE Corporation 6521

Company

株式会社オキサイドOXIDE Corporation

Investors

Buys

Total Value

¥9.7B ($62.6M)

Avg Return

+55.16%

Last Filing

2026-05-08

OXIDE Corporation (6521) has 10 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥9.7B ($62.6M) in reported transaction value. The earliest filing StockDrifts holds for OXIDE Corporation is dated 2021-04-06; the most recent is 2026-05-08. 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 +55.16%, 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
2026-05-08	SELL	negotiated	古川保典 Yasunori Furukawa	activist	1.3M	¥6,210	+17.4%	¥7M ($46K)
2026-04-27	SELL	negotiated	古川保典 Yasunori Furukawa	activist	1.3M	¥4,645	-32.6%	¥587M ($3.8M)
2026-04-23	SELL	negotiated	古川保典 Yasunori Furukawa	activist	1.4M	¥4,600	-33.9%	¥576M ($3.7M)
2026-04-23	BUY	negotiated	古川保典 Yasunori Furukawa	activist	1.4M	¥4,600	+33.9%	¥576M ($3.7M)
2025-07-03	BUY	unknown	NTTアドバンステクノロジ株式会社 NTT Advanced Technology Co., Ltd.	other	670.0K	¥2,031	+115.9%	¥1.4B ($8.8M)
2025-07-03	SELL	unknown	NTTアドバンステクノロジ株式会社 NTT Advanced Technology Co., Ltd.	other	670.0K	¥2,031	-115.9%	¥187M ($1.2M)
2025-07-03	SELL	unknown	NTTファイナンス株式会社 NTT Finance Corporation	other	500.0K	¥2,031	-115.9%	¥141M ($912K)
2025-07-03	BUY	unknown	NTTファイナンス株式会社 NTT Finance Corporation	other	500.0K	¥2,031	+115.9%	¥1.0B ($6.6M)
2025-05-16	BUY	negotiated	古川保典 Yasunori Furukawa	activist	1.5M	¥1,370	+220.1%	¥3M ($20K)
2025-05-16	SELL	unknown	古川保典 Yasunori Furukawa	unknown	1.5M	¥1,370	-220.1%	¥3M ($20K)
2025-02-03	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	162	¥1,296	-238.3%	¥2.4B ($15.6M)
2024-12-26	SELL	negotiated	古川保典 Yasunori Furukawa	activist	1.5M	¥1,409	-211.2%	¥229M ($1.5M)
2024-08-23	BUY	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	2.2M	¥1,720	+154.9%	¥3.8B ($24.4M)
2024-01-12	BUY	negotiated	ケーエルエー・テンコール株式会社(KLA-Tencor Japan KLA-Tencor Japan	strategic	950.0K	¥3,105	+41.2%	¥2.9B ($19.0M)
2024-01-12	SELL	negotiated	KLAテンコール(シンガポール)ピーティーイー・エルティーディーPte. Ltd.) KLA-Tencor (Singapore	strategic	410.0K	¥3,105	-41.2%	¥270M ($1.7M)
2024-01-12	SELL	negotiated	KTベンチャー・グループ・II・エルエルシー(KT Venture Group II KT Venture Group II, LLC	strategic	251.0K	¥3,105	-41.2%	¥167M ($1.1M)
2023-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	184.0K	¥4,350	-0.8%	¥334M ($2.2M)
2022-12-28	SELL	subscription	古川保典 Yasunori Furukawa	activist	759.8K	¥3,675	-19.3%	¥213M ($1.4M)
2022-11-08	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	259.6K	¥3,000	+46.2%	¥779M ($5.0M)
2022-06-20	SELL	unknown	株式会社日立ハイテク Hitachi High-Tech Corporation	unknown	0	¥2,295	-91.1%	¥698M ($4.5M)
2021-04-12	BUY	Market Buy	KTベンチャー・グループ・II・エルエルシー(KT Venture Group II KT Venture Group II, LLC	passive	125.5K	¥3,050	+43.8%	¥383M ($2.5M)
2021-04-12	BUY	Market Buy	KTベンチャー・グループ・II・エルエルシー(KT Venture Group II KT Venture Group II, LLC	passive	125.5K	¥3,050	+43.8%	¥383M ($2.5M)
2021-04-12	BUY	unknown	エヌ・ティ・ティ・アドバンステクノロジ株式会社 NTT Advanced Technology Co., Ltd.	other	335.0K	¥3,050	+43.8%	¥1.0B ($6.6M)
2021-04-12	BUY	unknown	NTTファイナンス株式会社 NTT Finance Corporation	other	250.0K	¥3,050	+43.8%	¥763M ($4.9M)
2021-04-12	BUY	Market Buy	KLAテンコール(シンガポール)ピーティーイー・エルティーディーPte. Ltd.) KLA-Tencor (Singapore	passive	205.0K	¥3,050	+43.8%	¥625M ($4.0M)
2021-04-12	BUY	Market Buy	KLAテンコール(シンガポール)ピーティーイー・エルティーディーPte. Ltd.) KLA-Tencor (Singapore	passive	205.0K	¥3,050	+43.8%	¥625M ($4.0M)
2021-04-09	BUY	negotiated	古川保典 Yasunori Furukawa	activist	759.8K	¥2,950	+48.6%	¥2.2B ($14.5M)
2021-04-06	BUY	unknown	株式会社日立ハイテク Hitachi High-Tech Corporation	strategic	280.0K	¥3,150	+39.2%	¥882M ($5.7M)

Frequently asked questions

Who has been buying OXIDE Corporation stock?: 9 distinct investors have filed 10 disclosed large-shareholding filings in OXIDE Corporation (6521), most recently on 2026-05-08. 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 OXIDE Corporation have?: OXIDE Corporation has 10 buy-side and 13 sell-side disclosures on record, covering ¥9.7B ($62.6M) in total reported value, spanning 2021-04-06 to 2026-05-08.
Where does StockDrifts get OXIDE 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 OXIDE Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.