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.

Where does StockDrifts get Penta-Ocean Construction Co., Ltd. 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.

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. 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 +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
2026-05-21	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	+3.0%	¥5.0B ($32.0M)
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	+3.0%	¥492M ($3.2M)
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	-3.5%	¥5.7B ($36.6M)
2026-04-22	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,651.5	+3.5%	¥1.4B ($9.3M)
2026-04-22	BUY	unknown	みずほ証券株式会社	other	387.7K	¥1,651.5	+3.5%	¥640M ($4.1M)
2026-04-22	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,651.5	+3.5%	¥9.3B ($60.2M)
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	+10.9%	¥20.9B ($135.1M)
2026-03-06	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,897.5	+10.9%	¥1.5B ($9.5M)
2026-03-06	SELL	unknown	みずほ証券株式会社	other	243.8K	¥1,897.5	+10.9%	¥412M ($2.7M)
2026-03-06	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,897.5	+10.9%	¥9.6B ($61.6M)
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	+11.1%	¥24.6B ($158.9M)
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	-11.1%	¥11.3B ($73.2M)
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	-3.5%	¥290M ($1.9M)
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	-3.5%	¥26.4B ($170.3M)
2026-01-09	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,634.5	-3.5%	¥1.5B ($9.5M)
2026-01-09	BUY	unknown	みずほ証券株式会社	other	999.2K	¥1,634.5	+3.5%	¥1.7B ($10.9M)
2026-01-09	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,634.5	-3.5%	¥9.6B ($61.6M)
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	-5.3%	¥1.5B ($9.6M)
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	-5.3%	¥31.0B ($199.8M)
2025-12-15	BUY	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,607	-5.3%	¥1.5B ($9.5M)
2025-12-15	SELL	unknown	みずほ証券株式会社	other	949.0K	¥1,607	-5.3%	¥1.6B ($10.4M)
2025-12-15	BUY	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,607	-5.3%	¥9.6B ($61.6M)
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	+4.2%	¥3.0B ($19.5M)
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	-4.2%	¥34.3B ($221.4M)
2025-12-04	SELL	unknown	みずほ信託銀行株式会社	other	871.7K	¥1,623	-4.2%	¥1.5B ($9.5M)
2025-12-04	BUY	unknown	みずほ証券株式会社	other	965.5K	¥1,623	+4.2%	¥1.6B ($10.5M)
2025-12-04	SELL	unknown	株式会社みずほ銀行	strategic	5.6M	¥1,623	-4.2%	¥9.6B ($61.6M)
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	-46.2%	¥265M ($1.7M)
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	-46.2%	¥132M ($854K)
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	-65.9%	¥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	-65.9%	¥2.4B ($15.6M)
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	+90.5%	¥9.4B ($60.7M)
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	-90.5%	¥203M ($1.3M)
2025-06-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	36.4K	¥887.8	+90.5%	¥32M ($208K)
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	+133.6%	¥207M ($1.3M)
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	+133.6%	¥2.1B ($13.2M)
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	+133.6%	¥1.0B ($6.5M)
2025-04-14	SELL	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	355.3K	¥724	-133.6%	¥41M ($267K)
2025-04-14	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.1M	¥724	+133.6%	¥5.1B ($33.0M)
2025-04-07	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	1.4M	¥667.3	+153.5%	¥907M ($5.9M)
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	+153.5%	¥1.9B ($12.1M)
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	+153.5%	¥932M ($6.0M)
2025-04-07	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.1M	¥667.3	+153.5%	¥4.7B ($30.4M)
2025-04-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	396.0K	¥667.3	+153.5%	¥264M ($1.7M)
2024-07-19	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	13.5M	¥669	+152.8%	¥9.0B ($58.3M)
2024-07-19	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	805.0K	¥669	+152.8%	¥539M ($3.5M)
2024-07-19	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	33.7K	¥669	+152.8%	¥23M ($145K)
2024-07-11	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	20.4M	¥663.4	-155.0%	¥968M ($6.2M)
2024-07-11	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	7.2M	¥663.4	-155.0%	¥987M ($6.4M)
2024-05-22	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	224.5K	¥654.1	+158.6%	¥14.4B ($92.9M)

Showing the 50 most recent of 98 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.
Where does StockDrifts get Penta-Ocean Construction Co., Ltd. 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 Penta-Ocean Construction Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.