Who has been buying Hokkaido Electric Power Company, Incorporated stock?

13 distinct investors have filed 24 disclosed large-shareholding filings in Hokkaido Electric Power Company, Incorporated (9509), most recently on 2026-05-13. 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 Hokkaido Electric Power Company, Incorporated have?

Hokkaido Electric Power Company, Incorporated has 24 buy-side and 17 sell-side disclosures on record, covering ¥18.3B ($118.3M) in total reported value, spanning 2021-04-22 to 2026-05-13.

Where does StockDrifts get Hokkaido Electric Power Company, Incorporated 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.

Hokkaido Electric Power Company, Incorporated 9509

Company

北海道電力株式会社Hokkaido Electric Power Company, Incorporated

Investors

Buys

Total Value

¥18.3B ($118.3M)

Avg Return

+15.67%

Last Filing

2026-05-13

Hokkaido Electric Power Company, Incorporated (9509) has 24 disclosed large-shareholding filings and 17 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥18.3B ($118.3M) in reported transaction value. The earliest filing StockDrifts holds for Hokkaido Electric Power Company, Incorporated is dated 2021-04-22; the most recent is 2026-05-13. 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 +15.67%, 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
2026-07-23	BUY	Market Buy	株式会社みずほ銀行	strategic	2.0M	¥1,012.5	+3.1%	¥22M ($141K)
2026-07-23	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.4M	¥1,012.5	+3.1%	¥1.5B ($9.4M)
2026-07-23	BUY	unknown	みずほインターナショナル Mizuho International plc	other	0	¥1,012.5	+3.1%	-
2026-07-23	BUY	Market Buy	アセットマネジメントOne株式会社	other	4.5M	¥1,012.5	+3.1%	¥22M ($141K)
2026-07-23	BUY	unknown	みずほ信託銀行株式会社	strategic	2.9M	¥1,012.5	+3.1%	¥3.0B ($19.3M)
2026-07-23	SELL	unknown	みずほ証券株式会社	other	14.6M	¥1,012.5	-3.1%	¥632M ($4.1M)
2026-07-23	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥1,012.5	+3.1%	-
2026-07-23	BUY	unknown	野村證券株式会社	other	2.3M	¥1,012.5	+3.1%	¥2.3B ($15.1M)
2026-07-23	BUY	unknown	野村アセットマネジメント株式会社	other	7.4M	¥1,012.5	+3.1%	¥7.5B ($48.4M)
2026-07-02	BUY	unknown	みずほインターナショナル Mizuho International plc	other	0	¥930.3	+10.3%	-
2026-07-02	BUY	Market Buy	アセットマネジメントOne株式会社	other	4.5M	¥930.3	+10.3%	¥280M ($1.8M)
2026-07-02	SELL	unknown	みずほ信託銀行株式会社	strategic	2.9M	¥930.3	-10.3%	¥20M ($129K)
2026-07-02	BUY	Market Buy	みずほ証券株式会社	other	15.3M	¥930.3	+10.3%	¥601M ($3.9M)
2026-07-02	SELL	unknown	株式会社みずほ銀行	strategic	2.0M	¥930.3	-10.3%	¥20M ($129K)
2026-05-13	BUY	Market Buy	アセットマネジメントOne株式会社	other	4.2M	¥999.2	-7.3%	¥237M ($1.5M)
2026-05-13	BUY	Market Buy	みずほ信託銀行株式会社	strategic	2.9M	¥999.2	-7.3%	¥172M ($1.1M)
2026-05-13	BUY	Market Buy	みずほ証券株式会社	other	14.5M	¥999.2	-7.3%	¥645M ($4.2M)
2026-05-13	BUY	Market Buy	株式会社みずほ銀行	strategic	2.0M	¥999.2	-7.3%	¥108M ($694K)
2026-05-13	BUY	unknown	みずほインターナショナル Mizuho International plc	other	0	¥999.2	-7.3%	-
2026-04-15	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,044.5	-6.4%	-
2026-04-15	SELL	subscription	アセットマネジメントOne株式会社	other	4.2M	¥1,044.5	+6.4%	¥45M ($290K)
2026-04-15	BUY	subscription	みずほ信託銀行株式会社	strategic	2.9M	¥1,044.5	-6.4%	¥22M ($145K)
2026-04-15	SELL	subscription	みずほ証券株式会社	other	14.7M	¥1,044.5	+6.4%	¥1.9B ($12.5M)
2026-04-15	BUY	subscription	株式会社みずほ銀行	strategic	2.0M	¥1,044.5	-6.4%	¥22M ($145K)
2026-03-18	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,102	+6.6%	-
2026-03-18	SELL	subscription	アセットマネジメントOne株式会社	other	4.3M	¥1,102	+6.6%	¥4.4B ($28.3M)
2026-03-18	BUY	subscription	みずほ信託銀行株式会社	strategic	2.9M	¥1,102	-6.6%	¥3.0B ($19.6M)
2026-03-18	SELL	subscription	みずほ証券株式会社	other	16.9M	¥1,102	+6.6%	¥17.4B ($112.2M)
2026-03-18	BUY	subscription	株式会社みずほ銀行	strategic	2.0M	¥1,102	-6.6%	¥2.1B ($13.4M)
2026-03-09	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,005	+2.4%	-
2026-03-09	BUY	subscription	アセットマネジメントOne株式会社	other	4.4M	¥1,005	+2.4%	¥4.5B ($28.9M)
2026-03-09	BUY	subscription	みずほ信託銀行株式会社	strategic	2.9M	¥1,005	+2.4%	¥3.0B ($19.6M)
2026-03-09	BUY	subscription	みずほ証券株式会社	other	21.3M	¥1,005	+2.4%	¥21.9B ($141.5M)
2026-03-09	BUY	subscription	株式会社みずほ銀行	strategic	2.0M	¥1,005	+2.4%	¥2.1B ($13.4M)
2025-10-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.6M	¥1,164	-11.6%	¥476M ($3.1M)
2025-10-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	2.9M	¥1,164	-11.6%	¥3.4B ($22.1M)
2025-10-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	214.1K	¥1,164	+11.6%	¥2.6B ($16.5M)
2025-10-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.0M	¥1,164	-11.6%	¥2.3B ($15.1M)
2025-08-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.2M	¥1,210	-14.9%	¥5.0B ($32.5M)
2025-08-22	SELL	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	2.9M	¥1,210	+14.9%	¥26M ($168K)
2025-08-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.4M	¥1,210	-14.9%	¥130M ($840K)
2025-08-22	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.0M	¥1,210	-14.9%	¥2.4B ($15.7M)
2025-07-23	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.2M	¥845.5	+21.8%	¥3.5B ($22.7M)
2025-07-23	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	3.0M	¥845.5	+21.8%	¥2.5B ($16.2M)
2025-07-23	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.3M	¥845.5	-21.8%	¥18M ($117K)
2025-07-23	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.0M	¥845.5	+21.8%	¥1.7B ($11.0M)
2025-07-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.2M	¥780.1	+32.0%	¥3.2B ($20.9M)
2025-07-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	3.0M	¥780.1	+32.0%	¥2.3B ($15.0M)
2025-07-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.3M	¥780.1	+32.0%	¥1.8B ($11.7M)
2025-07-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.0M	¥780.1	+32.0%	¥1.6B ($10.1M)

Showing the 50 most recent of 71 filings.

Frequently asked questions

Who has been buying Hokkaido Electric Power Company, Incorporated stock?: 13 distinct investors have filed 24 disclosed large-shareholding filings in Hokkaido Electric Power Company, Incorporated (9509), most recently on 2026-05-13. 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 Hokkaido Electric Power Company, Incorporated have?: Hokkaido Electric Power Company, Incorporated has 24 buy-side and 17 sell-side disclosures on record, covering ¥18.3B ($118.3M) in total reported value, spanning 2021-04-22 to 2026-05-13.
Where does StockDrifts get Hokkaido Electric Power Company, Incorporated 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 Hokkaido Electric Power Company, Incorporated. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.