Who has been buying Adeka Corporation stock?

10 distinct investors have filed 8 disclosed large-shareholding filings in Adeka Corporation (4401), most recently on 2026-03-23. 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 Adeka Corporation have?

Adeka Corporation has 8 buy-side and 7 sell-side disclosures on record, covering ¥20.3B ($130.9M) in total reported value, spanning 2022-04-06 to 2026-03-23.

Where does StockDrifts get Adeka 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.

Adeka Corporation 4401

Company

株式会社ADEKAAdeka Corporation

Investors

Buys

Total Value

¥20.3B ($130.9M)

Avg Return

+31.23%

Last Filing

2026-03-23

Adeka Corporation (4401) has 8 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥20.3B ($130.9M) in reported transaction value. The earliest filing StockDrifts holds for Adeka Corporation is dated 2022-04-06; the most recent is 2026-03-23. 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 +31.23%, 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
2026-03-23	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	2.5K	¥3,798	-4.3%	¥10M ($64K)
2026-03-23	SELL	unknown	アセットマネジメントOne株式会社	other	2.8M	¥3,798	-4.3%	¥10.9B ($70.3M)
2026-03-23	BUY	unknown	株式会社みずほ銀行	strategic	3.8M	¥3,798	-4.3%	¥14.9B ($96.4M)
2025-12-05	BUY	Market Buy	株式会社三井住友銀行	other	210.0K	¥3,600	+10.1%	¥832M ($5.4M)
2025-12-05	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	5.0M	¥3,600	+10.1%	¥19.8B ($127.7M)
2025-11-07	BUY	negotiated	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	2.1M	¥3,534	+12.1%	¥7.3B ($47.2M)
2025-11-07	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	1.9M	¥3,534	+12.1%	¥6.8B ($44.1M)
2025-11-07	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.2M	¥3,534	+12.1%	¥4.2B ($27.4M)
2025-09-04	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.0M	¥3,358	-18.0%	¥2.2B ($14.2M)
2025-09-04	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	1.9M	¥3,358	-18.0%	¥1.8B ($11.5M)
2025-09-04	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.2M	¥3,358	+18.0%	¥4.0B ($26.0M)
2024-07-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.9M	¥3,180	-24.6%	¥3.9B ($24.9M)
2024-07-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.8M	¥3,180	+24.6%	¥12.0B ($77.3M)
2024-07-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	191.1K	¥3,180	+24.6%	¥608M ($3.9M)
2023-06-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.7M	¥2,548	+55.5%	¥1.7B ($10.9M)
2023-06-21	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	2.5M	¥2,548	-55.5%	¥1.6B ($10.6M)
2023-06-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.2M	¥2,548	+55.5%	¥3.1B ($19.7M)
2023-02-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	5.2M	¥2,125	-86.5%	¥1.8B ($11.8M)
2023-02-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	5.2K	¥2,125	+86.5%	¥1.8B ($11.4M)
2023-02-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.8M	¥2,125	+86.5%	¥8.0B ($51.7M)
2022-04-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.5M	¥2,621	+51.2%	¥11.8B ($75.9M)
2022-04-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	117.1K	¥2,621	+51.2%	¥307M ($2.0M)

Frequently asked questions

Who has been buying Adeka Corporation stock?: 10 distinct investors have filed 8 disclosed large-shareholding filings in Adeka Corporation (4401), most recently on 2026-03-23. 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 Adeka Corporation have?: Adeka Corporation has 8 buy-side and 7 sell-side disclosures on record, covering ¥20.3B ($130.9M) in total reported value, spanning 2022-04-06 to 2026-03-23.
Where does StockDrifts get Adeka 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 Adeka Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.