Who has been buying PIETRO Co., Ltd. stock?

5 distinct investors have filed 3 disclosed large-shareholding filings in PIETRO Co., Ltd. (2818), most recently on 2026-05-14. 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 PIETRO Co., Ltd. have?

PIETRO Co., Ltd. has 3 buy-side and 4 sell-side disclosures on record, covering ¥120M ($774K) in total reported value, spanning 2021-11-24 to 2026-05-14.

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.

PIETRO Co., Ltd. 2818

Company

株式会社ピエトロPIETRO Co., Ltd.

Investors

Buys

Total Value

¥120M ($774K)

Avg Return

-3.19%

Last Filing

2026-05-14

PIETRO Co., Ltd. (2818) has 3 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥120M ($774K) in reported transaction value. The earliest filing StockDrifts holds for PIETRO Co., Ltd. is dated 2021-11-24; the most recent is 2026-05-14. Across these filings the average return since disclosure is -3.19%, 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
2026-05-14	BUY	negotiated	西川啓子	activist	258.6K	¥1,730	-	-
2026-05-14	BUY	negotiated	株式会社M・LYNX	activist	1.5M	¥1,730	-	-
2026-05-14	BUY	unknown	西川舞	strategic	3.5K	¥1,730	-	-
2026-05-08	BUY	negotiated	株式会社M・LYNX	activist	1.5M	¥1,732	-	-
2026-05-08	BUY	unknown	西川舞	strategic	3.5K	¥1,732	-	¥6M ($40K)
2026-05-08	BUY	negotiated	西川啓子	activist	258.6K	¥1,732	-	-
2026-05-08	BUY	negotiated	株式会社M・LYNX	activist	1.5M	¥1,732	-	-
2026-05-08	BUY	unknown	西川舞	strategic	3.5K	¥1,732	-	¥6M ($40K)
2026-05-08	BUY	negotiated	西川啓子	activist	258.6K	¥1,732	-	-
2026-05-01	BUY	Market Buy	西川啓子	activist	258.6K	¥1,731	+1.7%	¥13M ($87K)
2026-05-01	BUY	negotiated	株式会社M・LYNX	activist	1.5M	¥1,731	-	-
2025-08-04	SELL	negotiated	西川啓子 Keiko Nishikawa	activist	250.5K	¥1,742	-1.0%	¥34M ($222K)
2025-08-04	SELL	negotiated	株式会社M・LYNX M・LYNX Co., Ltd.	activist	1.5M	¥1,742	-1.0%	¥330M ($2.1M)
2023-12-20	BUY	Market Buy	西川啓子 Keiko Nishikawa	activist	239.4K	¥1,850	-4.9%	¥42M ($269K)
2023-12-20	SELL	Market Buy	株式会社M・LYNX M・LYNX Co., Ltd.	activist	1.5M	¥1,850	+4.9%	¥111M ($717K)
2022-08-17	SELL	negotiated	日清オイリオグループ株式会社 The Nisshin OilliO Group,Ltd.	activist	1.1M	¥1,792	+1.8%	¥346M ($2.2M)
2021-11-24	BUY	negotiated	西川啓子 Keiko Nishikawa	activist	217.4K	¥1,788	-	-
2021-11-24	BUY	Market Buy	西川啓子 Keiko Nishikawa	activist	217.4K	¥1,788	-1.6%	¥65M ($419K)
2021-11-24	BUY	Market Buy	株式会社M・LYNX M・LYNX Co., Ltd.	activist	1.5M	¥1,788	-	-
2021-11-24	BUY	negotiated	株式会社M・LYNX M・LYNX Co., Ltd.	activist	1.5M	¥1,788	-	-

Frequently asked questions

Who has been buying PIETRO Co., Ltd. stock?: 5 distinct investors have filed 3 disclosed large-shareholding filings in PIETRO Co., Ltd. (2818), most recently on 2026-05-14. 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 PIETRO Co., Ltd. have?: PIETRO Co., Ltd. has 3 buy-side and 4 sell-side disclosures on record, covering ¥120M ($774K) in total reported value, spanning 2021-11-24 to 2026-05-14.
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.