Who has been buying IDEC Corporation stock?

10 distinct investors have filed 9 disclosed large-shareholding filings in IDEC Corporation (6652), most recently on 2026-03-19. 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 IDEC Corporation have?

IDEC Corporation has 9 buy-side and 7 sell-side disclosures on record, covering ¥20.7B ($133.6M) in total reported value, spanning 2021-03-18 to 2026-03-19.

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.

IDEC Corporation 6652

Company

IDEC株式会社IDEC Corporation

Investors

Buys

Total Value

¥20.7B ($133.6M)

Avg Return

+31.89%

Last Filing

2026-03-19

IDEC Corporation (6652) has 9 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥20.7B ($133.6M) in reported transaction value. The earliest filing StockDrifts holds for IDEC Corporation is dated 2021-03-18; the most recent is 2026-03-19. Across these filings the average return since disclosure is +31.89%, 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
2026-09-04	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社	other	855.7K	¥3,630	+5.0%	¥3.1B ($20.0M)
2026-09-04	BUY	unknown	アモーヴァ・アセットマネジメント株式会社	other	746.1K	¥3,630	+5.0%	¥2.7B ($17.5M)
2026-03-19	BUY	unknown	大和証券株式会社	other	65.8K	¥3,130	+21.7%	¥206M ($1.3M)
2026-03-19	BUY	unknown	大和アセットマネジメント株式会社	other	1.7M	¥3,130	+21.7%	¥5.3B ($34.2M)
2025-08-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.4M	¥2,365	-61.1%	¥772M ($5.0M)
2025-08-06	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	787.5K	¥2,399	-58.8%	¥685M ($4.4M)
2025-08-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	524.9K	¥2,399	-58.8%	¥158M ($1.0M)
2025-05-09	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	1.4M	¥2,300	-65.7%	¥810M ($5.2M)
2024-08-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.8M	¥2,538	+50.1%	¥4.6B ($29.7M)
2024-08-06	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	1.1M	¥2,466	+54.5%	¥2.8B ($18.1M)
2024-08-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	623.3K	¥2,466	+54.5%	¥1.5B ($9.9M)
2024-04-05	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥2,596	-46.8%	¥880M ($5.7M)
2022-08-17	BUY	Market Buy	テンプルトン・インベストメント・カウンセル・エルエルシー(Templeton Investment Counsel Templeton Investment Counsel, LLC	passive	1.5M	¥2,901	+31.3%	¥4.3B ($27.6M)
2022-08-17	SELL	Market Buy	フランクリン・テンプルトン・インベストメンツ・コープ Franklin Templeton Investments Corp.	other	0	¥2,901	-31.3%	¥154M ($995K)
2022-07-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.7M	¥2,760	+38.0%	¥4.6B ($29.9M)
2021-10-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	412.5K	¥2,270	-	-
2021-10-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	11.4K	¥2,270	+67.8%	¥2.2B ($14.1M)
2021-10-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥2,270	-67.8%	¥694M ($4.5M)
2021-03-18	BUY	Market Buy	テンプルトン・インベストメント・カウンセル・エルエルシー(Templeton Investment Counsel, LLC) Templeton Investment Counsel, LLC	passive	1.8M	¥1,463.3	+160.4%	¥2.6B ($17.1M)

Frequently asked questions

Who has been buying IDEC Corporation stock?: 10 distinct investors have filed 9 disclosed large-shareholding filings in IDEC Corporation (6652), most recently on 2026-03-19. 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 IDEC Corporation have?: IDEC Corporation has 9 buy-side and 7 sell-side disclosures on record, covering ¥20.7B ($133.6M) in total reported value, spanning 2021-03-18 to 2026-03-19.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.