Who has been buying Osaki Electric Co., Ltd. stock?

13 distinct investors have filed 11 disclosed large-shareholding filings in Osaki Electric Co., Ltd. (6644), 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 Osaki Electric Co., Ltd. have?

Osaki Electric Co., Ltd. has 11 buy-side and 14 sell-side disclosures on record, covering ¥1.3B ($8.6M) in total reported value, spanning 2021-05-12 to 2025-09-19.

Where does StockDrifts get Osaki Electric 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.

Osaki Electric Co., Ltd. 6644

Company

大崎電気工業株式会社Osaki Electric Co., Ltd.

Investors

Buys

Total Value

¥1.3B ($8.6M)

Avg Return

+226.39%

Last Filing

2025-09-19

Osaki Electric Co., Ltd. (6644) has 11 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥1.3B ($8.6M) in reported transaction value. The earliest filing StockDrifts holds for Osaki Electric Co., Ltd. is dated 2021-05-12; 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 +226.39%, 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
2025-09-19	BUY	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	666.7K	¥1,272	+50.8%	¥848M ($5.5M)
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	1.4M	¥1,272	-50.8%	¥491M ($3.2M)
2025-02-14	SELL	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	4.3M	¥806	-138.0%	¥405M ($2.6M)
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	259.1K	¥669	-186.7%	¥6M ($42K)
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	469.1K	¥669	+186.7%	¥314M ($2.0M)
2024-07-29	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥669	+186.7%	¥6M ($42K)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.6M	¥669	+186.7%	¥1.0B ($6.7M)
2024-07-16	BUY	Market Buy	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	269.2K	¥690	+178.0%	¥143M ($924K)
2024-07-16	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	468.6K	¥690	+178.0%	¥60M ($387K)
2024-07-16	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥690	+178.0%	¥140M ($902K)
2024-07-16	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.6M	¥690	+178.0%	¥23M ($150K)
2024-07-02	SELL	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	4.8M	¥729	-163.1%	¥376M ($2.4M)
2023-03-22	BUY	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	1.8M	¥518	+270.3%	¥927M ($6.0M)
2023-03-22	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	678.5K	¥518	+270.3%	¥351M ($2.3M)
2022-04-18	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	389.4K	¥482	-297.9%	¥12M ($77K)
2022-04-18	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.3M	¥482	-297.9%	¥204M ($1.3M)
2022-04-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.6M	¥482	+297.9%	¥748M ($4.8M)
2022-04-18	SELL	negotiated	エム・ユー投資顧問株式会社 M.U. Investment Advisors Co., Ltd.	unknown	0	¥482	-297.9%	¥55M ($352K)
2022-04-18	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	66.4K	¥482	+297.9%	¥32M ($206K)
2022-04-04	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	5.4M	¥484	+296.3%	¥2.6B ($16.8M)
2022-04-04	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	0	¥484	-296.3%	¥2.5B ($16.1M)
2021-12-15	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	5.2M	¥451	+325.3%	¥69M ($444K)
2021-11-24	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	5.0M	¥480	+299.6%	¥236M ($1.5M)
2021-09-16	SELL	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	1.8M	¥565	-239.5%	¥443M ($2.9M)
2021-08-26	SELL	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	2.6M	¥549	-249.4%	¥276M ($1.8M)
2021-08-12	SELL	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	3.1M	¥577	-232.4%	¥293M ($1.9M)
2021-06-30	SELL	Market Buy	重田康光 YASUMITSU SHIGETA	passive	0	¥608	-215.5%	¥839M ($5.4M)
2021-06-30	SELL	Market Buy	有限会社光パワー HIKARI POWER LIMITED	passive	0	¥608	-215.5%	¥1.9B ($12.3M)
2021-06-30	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	4.5M	¥608	+215.5%	¥2.7B ($17.7M)
2021-06-30	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	4.5M	¥608	+215.5%	¥2.7B ($17.7M)
2021-06-03	BUY	Market Buy	重田康光 YASUMITSU SHIGETA	passive	1.4M	¥617	+210.9%	¥851M ($5.5M)
2021-06-03	BUY	Market Buy	有限会社光パワー HIKARI POWER LIMITED	passive	3.1M	¥617	+210.9%	¥307M ($2.0M)
2021-05-12	SELL	Market Buy	ノルウェー銀行(Norges Bank) Norges Bank	passive	2.0M	¥592	-224.0%	¥295M ($1.9M)

Frequently asked questions

Who has been buying Osaki Electric Co., Ltd. stock?: 13 distinct investors have filed 11 disclosed large-shareholding filings in Osaki Electric Co., Ltd. (6644), 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 Osaki Electric Co., Ltd. have?: Osaki Electric Co., Ltd. has 11 buy-side and 14 sell-side disclosures on record, covering ¥1.3B ($8.6M) in total reported value, spanning 2021-05-12 to 2025-09-19.
Where does StockDrifts get Osaki Electric 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 Osaki Electric Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.