Who has been buying Okasan Securities Group Inc. stock?

13 distinct investors have filed 13 disclosed large-shareholding filings in Okasan Securities Group Inc. (8609), most recently on 2025-09-19. 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 Okasan Securities Group Inc. have?

Okasan Securities Group Inc. has 13 buy-side and 13 sell-side disclosures on record, covering ¥10.1B ($65.2M) in total reported value, spanning 2022-04-22 to 2025-09-19.

Where does StockDrifts get Okasan Securities Group Inc. 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.

Okasan Securities Group Inc. 8609

Company

株式会社岡三証券グループOkasan Securities Group Inc.

Investors

Buys

Total Value

¥10.1B ($65.2M)

Avg Return

+88.67%

Last Filing

2025-09-19

Okasan Securities Group Inc. (8609) has 13 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥10.1B ($65.2M) in reported transaction value. The earliest filing StockDrifts holds for Okasan Securities Group Inc. is dated 2022-04-22; the most recent is 2025-09-19. 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 +88.67%, 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
2026-08-07	SELL	unknown	アセットマネジメントOne株式会社	other	2.9M	¥1,115	+0.0%	¥1.4B ($9.3M)
2026-08-07	SELL	unknown	株式会社みずほ銀行	strategic	9.8M	¥1,115	+0.0%	¥1.2B ($7.8M)
2025-09-19	BUY	negotiated	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	2.4M	¥696	+29.4%	¥1.7B ($10.7M)
2025-09-19	SELL	negotiated	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	3.7M	¥696	-29.4%	¥1.0B ($6.7M)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	8.9M	¥696	+29.4%	¥97M ($623K)
2025-05-26	BUY	unknown	加藤哲夫 Tetsuo Kato	strategic	1.0M	¥665	+35.5%	¥698M ($4.5M)
2025-05-26	BUY	unknown	加藤哲夫 Tetsuo Kato	strategic	1.0M	¥665	+35.5%	¥698M ($4.5M)
2025-05-26	BUY	unknown	有限会社藤精 Fujisei Co., Ltd.	strategic	5.3M	¥665	+35.5%	¥3.5B ($22.6M)
2025-05-26	BUY	unknown	有限会社藤精 Fujisei Co., Ltd.	strategic	5.3M	¥665	+35.5%	¥3.5B ($22.6M)
2025-05-26	BUY	unknown	三東株式会社 SANTOU	strategic	5.1M	¥665	+35.5%	¥3.4B ($22.0M)
2025-05-26	BUY	unknown	三東株式会社 SANTOU	strategic	5.1M	¥665	+35.5%	¥3.4B ($22.0M)
2024-07-29	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	159.7K	¥706	-27.6%	¥490M ($3.2M)
2024-07-29	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	1.1M	¥706	+27.6%	¥343M ($2.2M)
2024-07-29	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	8.8M	¥706	+27.6%	¥490M ($3.2M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	4.8M	¥706	+27.6%	¥3.4B ($22.1M)
2023-06-05	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	8.1M	¥457	-97.2%	¥1.1B ($7.0M)
2023-06-05	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	853.9K	¥457	+97.2%	¥390M ($2.5M)
2023-06-05	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	588.2K	¥457	+97.2%	¥11M ($68K)
2023-06-05	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	4.8M	¥457	-97.2%	¥243M ($1.6M)
2023-03-22	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.4M	¥399	+125.8%	¥953M ($6.1M)
2023-03-22	BUY	negotiated	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	5.2M	¥399	+125.8%	¥2.1B ($13.5M)
2023-03-22	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	8.7M	¥399	-125.8%	¥1.2B ($7.8M)
2023-03-06	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.4M	¥433	+108.1%	¥1.0B ($6.7M)
2023-03-06	SELL	Market Buy	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	5.2M	¥433	-108.1%	¥80M ($517K)
2023-03-06	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	11.7M	¥433	+108.1%	¥1.1B ($6.9M)
2023-01-19	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.4M	¥410	+119.8%	¥977M ($6.3M)
2023-01-19	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	9.3M	¥410	+119.8%	¥228M ($1.5M)
2023-01-19	SELL	Market Buy	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	5.4M	¥410	-119.8%	¥9M ($61K)
2023-01-10	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.4M	¥396	+127.5%	¥943M ($6.1M)
2023-01-10	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	8.7M	¥396	-127.5%	¥320M ($2.1M)
2023-01-10	SELL	negotiated	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	5.5M	¥396	-127.5%	¥604M ($3.9M)
2022-11-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.4M	¥373	-141.6%	¥69M ($445K)
2022-11-21	SELL	negotiated	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	7.0M	¥373	-141.6%	¥310M ($2.0M)
2022-11-21	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	9.5M	¥373	-141.6%	¥60M ($389K)
2022-08-01	BUY	unknown	三東株式会社 SANTOU	strategic	5.1M	¥342	+163.4%	¥1.8B ($11.3M)
2022-08-01	BUY	unknown	加藤哲夫 Tetsuo Kato	strategic	1.0M	¥342	+163.4%	¥359M ($2.3M)
2022-08-01	BUY	unknown	有限会社藤精 Fujisei Co., Ltd.	strategic	5.3M	¥342	+163.4%	¥1.8B ($11.6M)
2022-04-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.7M	¥366	-146.2%	¥686M ($4.4M)
2022-04-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	79.3K	¥366	+146.2%	¥3.0B ($19.1M)
2022-04-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	9.8M	¥366	+146.2%	¥3.6B ($23.3M)

Frequently asked questions

Who has been buying Okasan Securities Group Inc. stock?: 13 distinct investors have filed 13 disclosed large-shareholding filings in Okasan Securities Group Inc. (8609), most recently on 2025-09-19. 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 Okasan Securities Group Inc. have?: Okasan Securities Group Inc. has 13 buy-side and 13 sell-side disclosures on record, covering ¥10.1B ($65.2M) in total reported value, spanning 2022-04-22 to 2025-09-19.
Where does StockDrifts get Okasan Securities Group Inc. 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 Okasan Securities Group Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.