Who has been buying Power Solutions, Ltd. stock?

7 distinct investors have filed 6 disclosed large-shareholding filings in Power Solutions, Ltd. (4450), most recently on 2025-10-06. 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 Power Solutions, Ltd. have?

Power Solutions, Ltd. has 6 buy-side and 16 sell-side disclosures on record, covering ¥753M ($4.9M) in total reported value, spanning 2022-05-24 to 2025-10-06.

Where does StockDrifts get Power Solutions, 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.

Power Solutions, Ltd. 4450

Company

株式会社パワーソリューションズPower Solutions, Ltd.

Investors

Buys

Total Value

¥753M ($4.9M)

Avg Return

+63.23%

Last Filing

2025-10-06

Power Solutions, Ltd. (4450) has 6 disclosed large-shareholding filings and 16 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥753M ($4.9M) in reported transaction value. The earliest filing StockDrifts holds for Power Solutions, Ltd. is dated 2022-05-24; the most recent is 2025-10-06. 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 +63.23%, 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
2026-06-02	SELL	unknown	合同会社一誠堂	strategic	518.0K	¥1,920	-0.1%	¥112M ($720K)
2026-06-02	SELL	unknown	兼子浩之	strategic	81.0K	¥1,920	-0.1%	¥2M ($16K)
2026-06-02	SELL	unknown	合同会社未来企画	activist	471.0K	¥1,920	-0.1%	¥110M ($712K)
2026-06-02	SELL	unknown	佐藤成信	activist	176.0K	¥1,920	-0.1%	¥5M ($31K)
2025-10-06	BUY	unknown	奥村学 Manabu Okumura	other	245.5K	¥2,485	+1.2%	¥610M ($3.9M)
2025-10-06	BUY	unknown	株式会社フラクタル・ビジネス Fractal Business Inc.	other	113.6K	¥2,485	+1.2%	¥282M ($1.8M)
2025-09-02	SELL	unknown	合同会社未来企画 Mirai Planning LLC	activist	521.0K	¥2,005	-25.4%	¥226M ($1.5M)
2025-09-02	SELL	unknown	合同会社一誠堂 Isseido LLC	strategic	568.0K	¥2,005	-25.4%	¥72M ($465K)
2025-09-02	SELL	unknown	兼子浩之 Hiroyuki kaneko	strategic	81.0K	¥2,005	-25.4%	¥170M ($1.1M)
2025-09-02	SELL	unknown	佐藤成信 Narunobu Sato	activist	176.0K	¥2,005	-25.4%	¥22M ($144K)
2025-06-16	BUY	Market Buy	奥村学 Manabu Okumura	passive	50.9K	¥1,341	+87.5%	¥68M ($440K)
2025-06-16	BUY	Market Buy	株式会社フラクタル・ビジネス Fractal Business Inc.	passive	97.9K	¥1,341	+87.5%	¥131M ($847K)
2025-05-15	BUY	Market Buy	高橋忠郎 Tadaro Takahashi	activist	229.1K	¥1,325	+89.8%	¥75M ($484K)
2024-06-28	SELL	unknown	合同会社未来企画 Mirai Planning LLC	activist	298.0K	¥1,547.5	-62.5%	¥14M ($87K)
2024-06-28	SELL	unknown	合同会社一誠堂 Isseido LLC	strategic	284.0K	¥1,547.5	-62.5%	¥13M ($83K)
2024-06-28	SELL	unknown	兼子浩之 Hiroyuki kaneko	strategic	78.0K	¥1,547.5	-62.5%	¥3M ($22K)
2024-06-28	SELL	unknown	佐藤成信 Narunobu Sato	activist	88.0K	¥1,547.5	-62.5%	¥4M ($26K)
2022-08-29	SELL	unknown	合同会社一誠堂 Isseido LLC	strategic	284.0K	¥1,285	-95.7%	¥25M ($163K)
2022-08-29	SELL	unknown	合同会社未来企画 Mirai Planning LLC	activist	298.0K	¥1,285	-95.7%	¥26M ($170K)
2022-08-29	SELL	unknown	合同会社一誠堂 Isseido LLC	strategic	284.0K	¥1,285	-95.7%	¥25M ($163K)
2022-08-29	SELL	unknown	合同会社未来企画 Mirai Planning LLC	activist	298.0K	¥1,285	-95.7%	¥26M ($170K)
2022-08-29	SELL	unknown	兼子浩之 Hiroyuki kaneko	strategic	78.0K	¥1,285	-95.7%	¥21M ($134K)
2022-08-29	SELL	unknown	兼子浩之 Hiroyuki kaneko	strategic	78.0K	¥1,285	-95.7%	¥21M ($134K)
2022-08-29	SELL	unknown	佐藤成信 Narunobu Sato	activist	88.0K	¥1,285	-95.7%	¥21M ($138K)
2022-08-29	SELL	unknown	佐藤成信 Narunobu Sato	activist	88.0K	¥1,285	-95.7%	¥21M ($138K)
2022-05-24	BUY	unknown	高橋忠郎 Tadaro Takahashi	activist	82.3K	¥1,186	+112.1%	¥98M ($630K)
2022-05-24	BUY	unknown	高橋忠郎 Tadaro Takahashi	activist	82.3K	¥1,186	+112.1%	¥98M ($630K)

Frequently asked questions

Who has been buying Power Solutions, Ltd. stock?: 7 distinct investors have filed 6 disclosed large-shareholding filings in Power Solutions, Ltd. (4450), most recently on 2025-10-06. 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 Power Solutions, Ltd. have?: Power Solutions, Ltd. has 6 buy-side and 16 sell-side disclosures on record, covering ¥753M ($4.9M) in total reported value, spanning 2022-05-24 to 2025-10-06.
Where does StockDrifts get Power Solutions, 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 Power Solutions, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.