Who has been buying Mizuno Corporation stock?

12 distinct investors have filed 17 disclosed large-shareholding filings in Mizuno Corporation (8022), most recently on 2026-04-07. 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 Mizuno Corporation have?

Mizuno Corporation has 17 buy-side and 5 sell-side disclosures on record, covering ¥12.6B ($81.4M) in total reported value, spanning 2021-10-20 to 2026-04-07.

Where does StockDrifts get Mizuno 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.

Mizuno Corporation 8022

Company

美津濃株式会社Mizuno Corporation

Investors

Buys

Total Value

¥12.6B ($81.4M)

Avg Return

+104.77%

Last Filing

2026-04-07

Mizuno Corporation (8022) has 17 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥12.6B ($81.4M) in reported transaction value. The earliest filing StockDrifts holds for Mizuno Corporation is dated 2021-10-20; the most recent is 2026-04-07. 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 +104.77%, 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
2026-06-25	BUY	Market Buy	グランサム、マヨ、ヴァンオッテルローアンドカンパニーエルエルシー(Grantham, Mayo, Van Otterloo & Co. LLC) Grantham, Mayo, Van Otterloo & Co. LLC	activist	4.8M	¥3,480	+3.5%	¥3.0B ($19.2M)
2026-05-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	4.6M	¥3,220	+5.0%	¥3.1B ($19.7M)
2026-05-22	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.6M	¥3,220	+5.0%	¥616M ($4.0M)
2026-05-22	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	750.1K	¥3,220	+5.0%	¥180M ($1.2M)
2026-05-22	SELL	unknown	野村證券株式会社	other	1.1M	¥3,220	-5.0%	¥591M ($3.8M)
2026-05-22	BUY	unknown	三井住友カード株式会社	other	101.4K	¥3,220	+5.0%	¥327M ($2.1M)
2026-05-22	BUY	unknown	株式会社三井住友銀行	other	2.8M	¥3,220	+5.0%	¥9.0B ($58.0M)
2026-05-19	BUY	acquisition	グランサム、マヨ、ヴァンオッテルローアンドカンパニーエルエルシー(Grantham, Mayo, Van Otterloo & Co. LLC) Grantham, Mayo, Van Otterloo & Co. LLC	activist	4.0M	¥3,395	-1.0%	¥13.6B ($87.6M)
2026-04-07	BUY	unknown	野村證券株式会社	other	1.2M	¥3,490	-5.6%	¥4.4B ($28.1M)
2026-04-07	BUY	unknown	野村アセットマネジメント株式会社	other	2.4M	¥3,490	-5.6%	¥8.2B ($53.1M)
2026-04-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	695.0K	¥3,490	-5.6%	¥2.4B ($15.6M)
2026-03-05	BUY	Market Buy	公益財団法人ミズノスポーツ振興財団会長代表理事水野明人 Mizuno Sports Promotion Foundation	other	13.1M	¥3,735	-6.2%	¥1.3B ($8.3M)
2026-03-05	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社	other	1.4M	¥3,735	-6.2%	¥4.8B ($30.8M)
2026-03-05	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	1.8M	¥3,735	+6.2%	¥6.5B ($41.6M)
2026-03-05	BUY	negotiated	三井住友信託銀行株式会社	strategic	616.8K	¥3,735	+6.2%	¥2.2B ($13.9M)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	1.3M	¥2,605	+34.5%	¥312M ($2.0M)
2025-09-19	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	2.4M	¥2,605	+34.5%	¥6.3B ($40.8M)
2025-09-19	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	616.8K	¥2,605	+34.5%	¥1.6B ($10.4M)
2025-08-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.2M	¥2,683	+30.6%	¥3.2B ($20.5M)
2025-08-21	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	2.4M	¥2,683	+30.6%	¥6.5B ($42.1M)
2025-08-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	616.8K	¥2,683	+30.6%	¥1.7B ($10.7M)
2024-04-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	930.4K	¥2,400	+46.0%	¥2.2B ($14.4M)
2024-04-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.2M	¥2,400	+46.0%	¥727M ($4.7M)
2024-04-22	BUY	Market Buy	三井住友カード株式会社 Sumitomo Mitsui Card Co., Ltd.	other	33.8K	¥2,400	+46.0%	¥81M ($523K)
2024-04-22	SELL	Market Buy	SMBCファイナンスサービス株式会社 SMBC Finance Service Co., Ltd.	other	0	¥2,400	-46.0%	¥83M ($535K)
2023-07-24	BUY	Market Buy	SMBCファイナンスサービス株式会社 SMBC Finance Service Co., Ltd.	other	33.8K	¥1,225	+186.1%	¥41M ($267K)
2023-07-24	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	930.4K	¥1,225	+186.1%	¥1.1B ($7.4M)
2023-07-24	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	922.2K	¥1,225	+186.1%	¥394M ($2.5M)
2023-07-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	276.4K	¥1,205	-190.9%	¥77M ($496K)
2023-07-21	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	577.6K	¥1,205	-190.9%	¥250M ($1.6M)
2023-07-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	205.6K	¥1,205	+190.9%	¥248M ($1.6M)
2023-06-07	BUY	Market Buy	SMBCファイナンスサービス株式会社 SMBC Finance Service Co., Ltd.	other	33.8K	¥1,236.67	+183.4%	¥42M ($270K)
2023-06-07	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	930.4K	¥1,236.67	+183.4%	¥1.2B ($7.4M)
2023-06-07	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	601.9K	¥1,236.67	+183.4%	¥744M ($4.8M)
2022-11-07	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	339.5K	¥875.33	+300.4%	¥297M ($1.9M)
2022-11-07	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	784.8K	¥875.33	+300.4%	¥687M ($4.4M)
2022-11-07	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	205.6K	¥875.33	+300.4%	¥180M ($1.2M)
2021-10-20	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	1.1M	¥872.67	-301.6%	¥232M ($1.5M)

Frequently asked questions

Who has been buying Mizuno Corporation stock?: 12 distinct investors have filed 17 disclosed large-shareholding filings in Mizuno Corporation (8022), most recently on 2026-04-07. 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 Mizuno Corporation have?: Mizuno Corporation has 17 buy-side and 5 sell-side disclosures on record, covering ¥12.6B ($81.4M) in total reported value, spanning 2021-10-20 to 2026-04-07.
Where does StockDrifts get Mizuno 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 Mizuno Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.