Who has been buying Penta-Ocean Construction Co., Ltd. stock?

15 distinct investors have filed 32 disclosed large-shareholding filings in Penta-Ocean Construction Co., Ltd. (1893), most recently on 2026-04-22. 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 Penta-Ocean Construction Co., Ltd. have?

Penta-Ocean Construction Co., Ltd. has 32 buy-side and 36 sell-side disclosures on record, covering ¥79.7B ($514.5M) in total reported value, spanning 2021-06-18 to 2026-04-22.

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.

Penta-Ocean Construction Co., Ltd. 1893

Company

五洋建設株式会社Penta-Ocean Construction Co., Ltd.

Investors

Buys

Total Value

¥79.7B ($514.5M)

Avg Return

+113.71%

Last Filing

2026-04-22

Penta-Ocean Construction Co., Ltd. (1893) has 32 disclosed large-shareholding filings and 36 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥79.7B ($514.5M) in reported transaction value. The earliest filing StockDrifts holds for Penta-Ocean Construction Co., Ltd. is dated 2021-06-18; the most recent is 2026-04-22. Across these filings the average return since disclosure is +113.71%, 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
2026-09-18	BUY	unknown	ジェー・ピー・モルガン・エス・イー J.P. Morgan SE	other	1.2M	¥1,582	-4.0%	¥1.9B ($12.2M)
2026-09-18	BUY	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	436.9K	¥1,582	-4.0%	¥691M ($4.5M)
2026-09-18	BUY	unknown	JPモルガン証券株式会社	other	3.0M	¥1,582	-4.0%	¥4.7B ($30.6M)
2026-09-18	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	passive	1.9M	¥1,582	-4.0%	¥3.0B ($19.5M)
2026-09-18	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	2.9M	¥1,582	-4.0%	¥4.7B ($30.0M)
2026-09-18	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	1.3M	¥1,582	-4.0%	¥2.1B ($13.5M)
2026-09-18	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社	passive	5.8M	¥1,582	-4.0%	¥9.3B ($59.7M)
2026-05-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	6.4M	¥1,719.5	+11.7%	¥492M ($3.2M)
2026-05-21	SELL	unknown	アモーヴァ・アセットマネジメント株式会社	other	11.7M	¥1,719.5	+11.7%	¥5.0B ($32.0M)
2026-04-22	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,651.5	-	-
2026-04-22	BUY	unknown	みずほ証券株式会社	other	387.7K	¥1,651.5	-	¥640M ($4.1M)
2026-04-22	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,651.5	-	-
2026-04-22	SELL	unknown	アセットマネジメントOne株式会社	other	9.0M	¥1,651.5	+8.1%	¥5.7B ($36.6M)
2026-03-06	SELL	unknown	アセットマネジメントOne株式会社	other	12.4M	¥1,897.5	+20.0%	¥6.1B ($39.2M)
2026-03-06	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,897.5	-	-
2026-03-06	SELL	unknown	みずほ証券株式会社	other	243.8K	¥1,897.5	+20.0%	¥1.4B ($9.1M)
2026-03-06	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,897.5	-	-
2026-03-05	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社	other	6.7M	¥1,902.5	-20.2%	¥653M ($4.2M)
2026-03-05	SELL	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	14.6M	¥1,902.5	+20.2%	¥6.3B ($40.4M)
2026-01-09	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,634.5	-	-
2026-01-09	BUY	unknown	みずほ証券株式会社	other	999.2K	¥1,634.5	-7.1%	¥93M ($603K)
2026-01-09	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,634.5	-	-
2026-01-09	SELL	unknown	アセットマネジメントOne株式会社	other	15.6M	¥1,634.5	+7.1%	¥4.4B ($28.7M)
2026-01-09	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	171.4K	¥1,634.5	+7.1%	¥1.2B ($7.5M)
2025-12-15	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,607	-	-
2025-12-15	SELL	unknown	みずほ証券株式会社	other	949.0K	¥1,607	+5.5%	¥46M ($297K)
2025-12-15	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,607	-	-
2025-12-15	SELL	unknown	アセットマネジメントOne株式会社	other	18.3M	¥1,607	+5.5%	¥3.2B ($20.5M)
2025-12-15	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	875.8K	¥1,607	+5.5%	¥1.4B ($9.2M)
2025-12-04	SELL	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,623	+6.4%	¥2.3B ($15.0M)
2025-12-04	BUY	unknown	みずほ証券株式会社	other	965.5K	¥1,623	-6.4%	¥1.0B ($6.6M)
2025-12-04	SELL	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,623	+6.4%	¥882M ($5.7M)
2025-12-04	SELL	unknown	アセットマネジメントOne株式会社	other	20.3M	¥1,623	+6.4%	¥557M ($3.6M)
2025-12-04	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	1.8M	¥1,623	-6.4%	¥186M ($1.2M)
2025-09-19	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	6.4M	¥1,157	-31.2%	¥132M ($854K)
2025-09-19	SELL	unknown	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	17.8M	¥1,157	-31.2%	¥265M ($1.7M)
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	6.5M	¥1,019.5	-49.0%	¥787M ($5.1M)
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	18.1M	¥1,019.5	-49.0%	¥2.4B ($15.6M)
2025-06-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	36.4K	¥887.8	-	-
2025-06-18	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	558.7K	¥887.8	-71.0%	¥203M ($1.3M)
2025-06-18	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	10.7M	¥887.8	+71.0%	¥9.4B ($60.7M)
2025-04-14	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.1M	¥724	-	-
2025-04-14	SELL	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	355.3K	¥724	-109.7%	¥41M ($267K)
2025-04-14	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	1.4M	¥724	-	-
2025-04-14	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	20.6M	¥724	+109.7%	¥2.1B ($13.2M)
2025-04-14	BUY	Market Buy	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	1.6M	¥724	+109.7%	¥207M ($1.3M)
2025-04-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	17.8M	¥667.3	+127.6%	¥1.9B ($12.1M)
2025-04-07	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.1M	¥667.3	-	-
2025-04-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	396.0K	¥667.3	-	-
2025-04-07	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	1.4M	¥667.3	-	-

Showing the 50 most recent of 105 filings.

Frequently asked questions

Who has been buying Penta-Ocean Construction Co., Ltd. stock?: 15 distinct investors have filed 32 disclosed large-shareholding filings in Penta-Ocean Construction Co., Ltd. (1893), most recently on 2026-04-22. 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 Penta-Ocean Construction Co., Ltd. have?: Penta-Ocean Construction Co., Ltd. has 32 buy-side and 36 sell-side disclosures on record, covering ¥79.7B ($514.5M) in total reported value, spanning 2021-06-18 to 2026-04-22.
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.