Who has been buying KOA Corporation stock?

13 distinct investors have filed 32 disclosed large-shareholding filings in KOA Corporation (6999), most recently on 2026-04-06. 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 KOA Corporation have?

KOA Corporation has 32 buy-side and 27 sell-side disclosures on record, covering ¥34.6B ($223.1M) in total reported value, spanning 2021-07-07 to 2026-04-06.

Where does StockDrifts get KOA 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.

KOA Corporation 6999

Company

KOA株式会社KOA Corporation

Investors

Buys

Total Value

¥34.6B ($223.1M)

Avg Return

+36.43%

Last Filing

2026-04-06

KOA Corporation (6999) has 32 disclosed large-shareholding filings and 27 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥34.6B ($223.1M) in reported transaction value. The earliest filing StockDrifts holds for KOA Corporation is dated 2021-07-07; the most recent is 2026-04-06. 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 +36.43%, 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
2026-08-07	SELL	unknown	アセットマネジメントOne株式会社	other	1.5M	¥2,430	-4.1%	¥774M ($5.0M)
2026-08-07	SELL	unknown	みずほ証券株式会社	other	12.2K	¥2,430	-4.1%	¥200M ($1.3M)
2026-07-07	BUY	unknown	アセットマネジメントOne株式会社	other	1.8M	¥2,559	+4.1%	¥4.6B ($29.5M)
2026-07-07	BUY	unknown	みずほ証券株式会社	other	92.3K	¥2,559	+4.1%	¥236M ($1.5M)
2026-07-07	BUY	Market Buy	大樹生命保険株式会社	passive	47.7K	¥2,559	+4.1%	¥122M ($788K)
2026-07-07	SELL	unknown	ニッセイアセットマネジメント株式会社	other	17.2K	¥2,559	-4.1%	¥38M ($248K)
2026-07-07	BUY	Market Buy	日本生命保険相互会社	passive	2.2M	¥2,559	+4.1%	¥796M ($5.1M)
2026-04-06	BUY	negotiated	三菱UFJ信託銀行株式会社	passive	1.3M	¥1,584	+16.2%	¥475M ($3.1M)
2026-04-06	SELL	negotiated	株式会社三菱UFJ銀行	strategic	882.4K	¥1,584	-16.2%	¥71M ($460K)
2026-04-06	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社	other	103.5K	¥1,584	+16.2%	¥164M ($1.1M)
2026-04-06	BUY	negotiated	三菱UFJアセットマネジメント株式会社	passive	191.4K	¥1,584	+16.2%	¥53M ($345K)
2026-01-08	BUY	negotiated	株式会社八十二長野銀行	strategic	1.9M	¥1,395	+45.0%	¥3.7B ($24.2M)
2026-01-08	SELL	negotiated	株式会社長野銀行	unknown	0	¥1,395	-45.0%	-
2026-01-08	BUY	negotiated	株式会社八十二長野銀行	strategic	1.9M	¥1,395	+45.0%	¥3.7B ($24.2M)
2026-01-08	SELL	negotiated	株式会社長野銀行	unknown	0	¥1,395	-45.0%	-
2025-09-16	SELL	unknown	日本バリュー・インベスターズ株式会社 Nippon Value Investors KK	other	900.8K	¥1,198	-68.9%	¥1.3B ($8.3M)
2025-05-09	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.3M	¥806	+151.0%	¥1.1B ($6.8M)
2025-05-09	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	227.2K	¥806	+151.0%	¥1.2B ($7.8M)
2024-11-08	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.8M	¥1,025	+97.4%	¥1.9B ($12.2M)
2024-11-08	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	232.2K	¥1,025	+97.4%	¥238M ($1.5M)
2024-11-07	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	493.7K	¥1,046	+93.4%	¥47M ($300K)
2024-11-07	SELL	unknown	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	1.2M	¥1,046	-93.4%	¥470M ($3.0M)
2024-08-19	BUY	unknown	日本バリュー・インベスターズ株式会社 Nippon Value Investors KK	other	2.1M	¥1,209	+67.3%	¥2.6B ($16.6M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.0M	¥1,302	+55.4%	¥1.3B ($8.4M)
2024-07-29	SELL	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	170.1K	¥1,302	-55.4%	¥47M ($306K)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥1,302	-55.4%	¥258M ($1.7M)
2024-05-09	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.9M	¥1,570	+28.9%	¥2.9B ($18.9M)
2024-05-09	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	7.3K	¥1,570	+28.9%	¥998M ($6.4M)
2024-05-08	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	448.2K	¥1,590	-27.2%	¥109M ($706K)
2024-05-08	BUY	unknown	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	1.6M	¥1,590	+27.2%	¥2.6B ($16.6M)
2024-01-11	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	2.2M	¥1,558	+29.9%	¥3.4B ($21.7M)
2024-01-11	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	10.0K	¥1,558	+29.9%	¥1.1B ($7.2M)
2024-01-11	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	172.4K	¥1,558	+29.9%	¥271M ($1.7M)
2023-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.5M	¥1,507	-34.2%	¥1.3B ($8.6M)
2023-11-07	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	518.9K	¥1,512	-33.8%	¥1.1B ($6.8M)
2023-11-07	SELL	unknown	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	2.2M	¥1,512	-33.8%	¥67M ($434K)
2023-10-20	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-903	¥1,661	-21.8%	¥343M ($2.2M)
2023-10-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	2.5M	¥1,661	+21.8%	¥350M ($2.3M)
2023-10-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	93.8K	¥1,661	+21.8%	¥156M ($1.0M)
2023-08-04	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.2M	¥1,756	+15.2%	¥533M ($3.4M)
2023-08-04	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	2.2M	¥1,756	+15.2%	¥363M ($2.3M)
2023-07-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	912.9K	¥1,837	+10.1%	¥796M ($5.1M)
2023-07-21	SELL	unknown	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	2.0M	¥1,837	-10.1%	¥260M ($1.7M)
2023-07-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	2.3M	¥1,832	+10.4%	¥245M ($1.6M)
2023-07-07	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-13.3K	¥1,832	-10.4%	¥349M ($2.2M)
2023-07-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	206.8K	¥1,832	+10.4%	¥378M ($2.4M)
2023-06-08	BUY	negotiated	株式会社長野銀行 Nagano Bank, Ltd.	strategic	226.2K	¥1,654	+22.3%	¥374M ($2.4M)
2023-06-08	BUY	negotiated	株式会社八十二銀行 The Hachijuni Bank, Ltd.	strategic	1.8M	¥1,654	+22.3%	¥3.0B ($19.6M)
2023-06-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.4M	¥1,686	-20.0%	¥955M ($6.2M)
2023-04-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	2.1M	¥1,729	+17.0%	¥175M ($1.1M)

Showing the 50 most recent of 72 filings.

Frequently asked questions

Who has been buying KOA Corporation stock?: 13 distinct investors have filed 32 disclosed large-shareholding filings in KOA Corporation (6999), most recently on 2026-04-06. 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 KOA Corporation have?: KOA Corporation has 32 buy-side and 27 sell-side disclosures on record, covering ¥34.6B ($223.1M) in total reported value, spanning 2021-07-07 to 2026-04-06.
Where does StockDrifts get KOA 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 KOA Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.