Who has been buying Seiko Holdings Corporation stock?

6 distinct investors have filed 8 disclosed large-shareholding filings in Seiko Holdings Corporation (8050), most recently on 2026-03-04. 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 Seiko Holdings Corporation have?

Seiko Holdings Corporation has 8 buy-side and 6 sell-side disclosures on record, covering ¥16.5B ($106.3M) in total reported value, spanning 2024-04-19 to 2026-03-04.

Where does StockDrifts get Seiko Holdings 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.

Seiko Holdings Corporation 8050

Company

セイコーグループ株式会社Seiko Holdings Corporation

Investors

Buys

Total Value

¥16.5B ($106.3M)

Avg Return

+133.95%

Last Filing

2026-03-04

Seiko Holdings Corporation (8050) has 8 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥16.5B ($106.3M) in reported transaction value. The earliest filing StockDrifts holds for Seiko Holdings Corporation is dated 2024-04-19; the most recent is 2026-03-04. 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 +133.95%, 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
2026-03-04	SELL	Market Buy	JPモルガン証券株式会社	other	72.5K	¥6,250	-2.9%	¥466M ($3.0M)
2026-03-04	BUY	Market Buy	JPモルガン・アセット・マネジメント(アジア・パシフィック)リミテッドLimited) JPMorgan Asset Management (Asia Pacific	other	72.5K	¥6,250	-2.9%	¥466M ($3.0M)
2026-03-04	BUY	Market Buy	ジェー・ピー・モルガン・アセット・マネジメント(ユーケー)リミテッドLimited) JPMorgan Asset Management(UK	passive	53.9K	¥6,250	-2.9%	¥347M ($2.2M)
2026-03-04	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社	passive	2.3M	¥6,250	+2.9%	¥14.6B ($94.2M)
2026-03-04	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	47.8K	¥6,250	-2.9%	¥307M ($2.0M)
2025-12-03	BUY	Market Buy	JPモルガン証券株式会社	other	107.9K	¥3,580	+79.6%	¥694M ($4.5M)
2025-12-03	BUY	Market Buy	JPモルガン・アセット・マネジメント(アジア・パシフィック)リミテッドLimited) JPMorgan Asset Management (Asia Pacific	other	72.5K	¥3,580	+79.6%	¥466M ($3.0M)
2025-12-03	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社	passive	1.9M	¥3,580	+79.6%	¥12.2B ($78.6M)
2025-09-18	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	34.5K	¥3,275	-96.3%	¥339M ($2.2M)
2025-09-18	SELL	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	19.1K	¥3,275	-96.3%	¥81M ($525K)
2025-09-18	BUY	Market Buy	JPモルガン・アセット・マネジメント(アジア・パシフィック)リミテッドLimited) JPMorgan Asset Management (Asia Pacific	other	65.1K	¥3,275	+96.3%	¥213M ($1.4M)
2025-09-18	SELL	Market Buy	JPモルガン・アセット・マネジメント株式会社 JPMorgan Asset Management (Japan) Limited	passive	1.9M	¥3,275	-96.3%	¥1.1B ($6.8M)
2024-12-18	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	135.1K	¥2,380	-170.2%	¥237M ($1.5M)
2024-12-18	SELL	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	43.8K	¥2,380	-170.2%	¥128M ($826K)
2024-12-18	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社 JPMorgan Asset Management (Japan) Limited	passive	2.2M	¥2,380	+170.2%	¥985M ($6.4M)
2024-04-19	BUY	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	99.5K	¥2,010	+219.9%	¥200M ($1.3M)
2024-04-19	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社 JPMorgan Asset Management (Japan) Limited	passive	1.8M	¥2,010	+219.9%	¥3.5B ($22.9M)
2024-04-19	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	236.8K	¥2,010	+219.9%	¥476M ($3.1M)

Frequently asked questions

Who has been buying Seiko Holdings Corporation stock?: 6 distinct investors have filed 8 disclosed large-shareholding filings in Seiko Holdings Corporation (8050), most recently on 2026-03-04. 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 Seiko Holdings Corporation have?: Seiko Holdings Corporation has 8 buy-side and 6 sell-side disclosures on record, covering ¥16.5B ($106.3M) in total reported value, spanning 2024-04-19 to 2026-03-04.
Where does StockDrifts get Seiko Holdings 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 Seiko Holdings Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.