Who has been buying Sankyo Seiko Co., Ltd. stock?

4 distinct investors have filed 5 disclosed large-shareholding filings in Sankyo Seiko Co., Ltd. (8018), most recently on 2024-10-07. 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 Sankyo Seiko Co., Ltd. have?

Sankyo Seiko Co., Ltd. has 5 buy-side and 2 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2022-07-08 to 2024-10-07.

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.

Sankyo Seiko Co., Ltd. 8018

Company

三共生興株式会社Sankyo Seiko Co., Ltd.

Investors

Buys

Total Value

¥1.2B ($7.6M)

Avg Return

+61.10%

Last Filing

2024-10-07

Sankyo Seiko Co., Ltd. (8018) has 5 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.2B ($7.6M) in reported transaction value. The earliest filing StockDrifts holds for Sankyo Seiko Co., Ltd. is dated 2022-07-08; the most recent is 2024-10-07. Across these filings the average return since disclosure is +61.10%, 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
2026-06-01	SELL	negotiated	株式会社三菱UFJ銀行	strategic	1.4M	¥861	-0.2%	¥352M ($2.3M)
2026-06-01	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	372.3K	¥861	-0.2%	¥87M ($562K)
2026-06-01	BUY	Market Buy	三菱UFJアセットマネジメント株式会社	passive	188.6K	¥861	+0.2%	¥4M ($26K)
2024-10-07	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	472.7K	¥605	+42.6%	¥286M ($1.8M)
2024-10-07	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.8M	¥605	+42.6%	¥1.1B ($7.0M)
2024-10-07	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	183.7K	¥605	+42.6%	¥111M ($717K)
2023-05-29	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.8M	¥558	-54.7%	¥217M ($1.4M)
2023-05-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	427.7K	¥558	-54.7%	¥570M ($3.7M)
2023-05-29	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	178.1K	¥558	+54.7%	¥42M ($271K)
2022-07-08	BUY	unknown	株式会社シティインデックスイレブンス City Index Eleven Co., Ltd.	activist	121.0K	¥506	+70.5%	¥47M ($303K)

Frequently asked questions

Who has been buying Sankyo Seiko Co., Ltd. stock?: 4 distinct investors have filed 5 disclosed large-shareholding filings in Sankyo Seiko Co., Ltd. (8018), most recently on 2024-10-07. 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 Sankyo Seiko Co., Ltd. have?: Sankyo Seiko Co., Ltd. has 5 buy-side and 2 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2022-07-08 to 2024-10-07.
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.