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.

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. 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
2026-08-19	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社	passive	5.0M	¥11,200	-12.3%	¥4.9B ($31.7M)
2026-08-19	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	112.4K	¥11,200	-12.3%	¥93M ($598K)
2026-08-19	BUY	Market Buy	ジェー・ピー・モルガン・インベストメント・マネージメント・インク J.P. Morgan Investment Management Inc.	passive	134.6K	¥11,200	-	¥1.5B ($9.7M)
2026-08-19	SELL	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	passive	106.3K	¥11,200	+12.3%	¥464M ($3.0M)
2026-08-19	SELL	unknown	JPモルガン証券株式会社	other	49.1K	¥11,200	+12.3%	¥1.1B ($7.2M)
2026-08-19	BUY	unknown	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	679.7K	¥11,200	-	¥7.6B ($49.1M)
2026-08-19	SELL	unknown	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	31.6K	¥11,200	+12.3%	¥742M ($4.8M)
2026-08-18	SELL	negotiated	三光起業株式会社	strategic	8.8M	¥10,760	+8.7%	¥1.3B ($8.6M)
2026-08-18	BUY	Market Buy	深川起業株式会社	strategic	1.2M	¥10,760	-8.7%	¥5.9B ($37.9M)
2026-03-04	SELL	Market Buy	JPモルガン証券株式会社	other	72.5K	¥6,250	-57.1%	¥207M ($1.3M)
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	+57.1%	¥2.3B ($15.0M)
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	-	¥337M ($2.2M)
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	-	-
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	-	¥299M ($1.9M)
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	+174.3%	¥6.8B ($43.8M)
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	+174.3%	¥260M ($1.7M)
2025-12-03	BUY	Market Buy	JPモルガン証券株式会社	other	107.9K	¥3,580	+174.3%	¥386M ($2.5M)
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	-199.8%	¥1.1B ($6.8M)
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	-	¥213M ($1.4M)
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	-199.8%	¥81M ($525K)
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	-199.8%	¥339M ($2.2M)
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	+312.6%	¥985M ($6.4M)
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	-312.6%	¥128M ($826K)
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	-312.6%	¥237M ($1.5M)
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	+388.6%	¥3.5B ($22.9M)
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	+388.6%	¥200M ($1.3M)
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	+388.6%	¥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.
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.