Who has been buying Zuiko Corporation stock?

13 distinct investors have filed 16 disclosed large-shareholding filings in Zuiko Corporation (6279), most recently on 2026-03-02. 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 Zuiko Corporation have?

Zuiko Corporation has 16 buy-side and 16 sell-side disclosures on record, covering ¥6.2B ($40.3M) in total reported value, spanning 2021-12-06 to 2026-03-02.

Where does StockDrifts get Zuiko 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.

Zuiko Corporation 6279

Company

株式会社瑞光Zuiko Corporation

Investors

Buys

Total Value

¥6.2B ($40.3M)

Avg Return

-19.08%

Last Filing

2026-03-02

Zuiko Corporation (6279) has 16 disclosed large-shareholding filings and 16 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥6.2B ($40.3M) in reported transaction value. The earliest filing StockDrifts holds for Zuiko Corporation is dated 2021-12-06; the most recent is 2026-03-02. 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 -19.08%, 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
2026-03-02	BUY	unknown	和田タヅエ	strategic	65.3K	¥937	+3.0%	¥59M ($383K)
2026-03-02	SELL	unknown	和田明男	strategic	1.0M	¥937	+3.0%	¥937M ($6.0M)
2026-03-02	BUY	unknown	和田タヅエ	strategic	65.3K	¥937	+3.0%	¥59M ($383K)
2026-03-02	SELL	unknown	和田明男	strategic	1.0M	¥937	+3.0%	¥937M ($6.0M)
2026-01-30	BUY	unknown	和田タヅエ	strategic	65.3K	¥1,005	+9.6%	¥59M ($383K)
2026-01-30	SELL	unknown	和田明男	strategic	1.6M	¥1,005	+9.6%	¥1.4B ($9.1M)
2026-01-13	SELL	unknown	和田明男	strategic	1.6M	¥996	+8.7%	¥1.4B ($9.1M)
2026-01-13	BUY	unknown	和田タヅエ	strategic	65.3K	¥996	+8.7%	¥59M ($383K)
2025-10-17	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	10.7M	¥978	-7.1%	¥242M ($1.6M)
2025-09-30	BUY	unknown	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	47.3K	¥993	-8.5%	¥14M ($92K)
2025-09-30	SELL	unknown	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	76.9K	¥993	+8.5%	¥11M ($74K)
2025-09-30	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.0M	¥993	+8.5%	¥100M ($646K)
2025-09-30	SELL	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	unknown	0	¥993	+8.5%	¥19.2B ($123.6M)
2025-08-26	SELL	unknown	和田明男 Akio Wada	strategic	1.9M	¥970	+6.3%	¥148M ($955K)
2025-08-26	BUY	unknown	和田タヅエ Tazue Wada	strategic	65.3K	¥970	-6.3%	¥63M ($409K)
2025-08-07	BUY	unknown	和田明男 Akio Wada	strategic	1.9M	¥1,001	-9.2%	¥1.9B ($11.9M)
2025-08-07	BUY	unknown	和田タヅエ Tazue Wada	unknown	65.3K	¥1,001	-9.2%	¥65M ($422K)
2025-05-08	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	30.6K	¥1,000	-9.1%	¥31M ($197K)
2025-05-08	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	88.1K	¥1,000	-9.1%	¥88M ($568K)
2025-05-08	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥1,000	-9.1%	¥1.1B ($7.3M)
2025-05-08	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	193.1K	¥1,000	-9.1%	¥193M ($1.2M)
2025-04-07	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	35.0K	¥957	+5.0%	¥146M ($942K)
2025-04-07	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	58.9K	¥957	-5.0%	¥56M ($364K)
2025-04-07	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥957	+5.0%	¥135M ($871K)
2025-04-07	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	193.1K	¥957	-5.0%	¥185M ($1.2M)
2025-02-10	BUY	unknown	和田タヅエ Tazue Wada	other	65.3K	¥1,308	-30.5%	¥85M ($551K)
2025-02-10	BUY	unknown	和田明男 Akio Wada	strategic	2.0M	¥1,308	-30.5%	¥2.6B ($16.9M)
2025-02-03	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	193.1K	¥1,303	-30.2%	¥252M ($1.6M)
2025-02-03	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	187.6K	¥1,303	-30.2%	¥244M ($1.6M)
2025-02-03	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	56.5K	¥1,303	-30.2%	¥74M ($475K)
2025-02-03	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.2M	¥1,303	-30.2%	¥1.6B ($10.4M)
2025-01-28	BUY	unknown	和田タヅエ Tazue Wada	other	65.3K	¥1,361	-33.2%	¥89M ($573K)
2025-01-28	BUY	unknown	和田明男 Akio Wada	strategic	2.0M	¥1,361	-33.2%	¥2.7B ($17.6M)
2024-08-14	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	17.3K	¥1,120	+18.8%	¥290K ($2K)
2024-08-14	SELL	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	11.2K	¥1,120	+18.8%	¥258K ($2K)
2024-03-28	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	41.9K	¥1,391	-34.6%	¥58M ($376K)
2024-03-28	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	4.0M	¥1,391	-34.6%	¥5.6B ($35.9M)
2024-03-01	BUY	unknown	株式会社みちかけ Michikake Co., Ltd.	strategic	3.0M	¥1,594	-43.0%	¥4.8B ($30.9M)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	strategic	65.3K	¥1,594	-43.0%	¥104M ($671K)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	strategic	65.3K	¥1,594	-43.0%	¥104M ($671K)
2024-03-01	BUY	unknown	和田隆男 Takao Wada	strategic	234.2K	¥1,594	-43.0%	¥373M ($2.4M)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	strategic	65.3K	¥1,594	-43.0%	¥104M ($671K)
2024-03-01	BUY	unknown	和田隆男 Takao Wada	strategic	234.2K	¥1,594	-43.0%	¥78M ($503K)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	strategic	16.3K	¥1,594	-43.0%	¥26M ($168K)
2024-03-01	BUY	unknown	和田隆男 Takao Wada	strategic	46.4K	¥1,594	-43.0%	¥74M ($477K)
2024-03-01	BUY	unknown	株式会社みちかけ Michikake Co., Ltd.	strategic	3.0M	¥1,594	-43.0%	¥4.8B ($30.9M)
2024-03-01	BUY	unknown	和田隆男 Takao Wada	strategic	234.2K	¥1,594	-43.0%	¥373M ($2.4M)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	strategic	65.3K	¥1,594	-43.0%	¥104M ($671K)
2024-03-01	BUY	unknown	和田隆男 Takao Wada	strategic	234.2K	¥1,594	-43.0%	¥78M ($503K)
2024-03-01	BUY	unknown	和田繁子 Shigeko Wada	unknown	16.3K	¥1,594	-43.0%	¥26M ($168K)

Showing the 50 most recent of 61 filings.

Frequently asked questions

Who has been buying Zuiko Corporation stock?: 13 distinct investors have filed 16 disclosed large-shareholding filings in Zuiko Corporation (6279), most recently on 2026-03-02. 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 Zuiko Corporation have?: Zuiko Corporation has 16 buy-side and 16 sell-side disclosures on record, covering ¥6.2B ($40.3M) in total reported value, spanning 2021-12-06 to 2026-03-02.
Where does StockDrifts get Zuiko 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 Zuiko Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.