Who has been buying PORTERS Corporation stock?

6 distinct investors have filed 11 disclosed large-shareholding filings in PORTERS Corporation (5126), most recently on 2026-01-29. 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 PORTERS Corporation have?

PORTERS Corporation has 11 buy-side and 6 sell-side disclosures on record, covering ¥4.8B ($30.7M) in total reported value, spanning 2022-10-03 to 2026-01-29.

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.

PORTERS Corporation 5126

Company

ポーターズ株式会社PORTERS Corporation

Investors

Buys

Total Value

¥4.8B ($30.7M)

Avg Return

-26.84%

Last Filing

2026-01-29

PORTERS Corporation (5126) has 11 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥4.8B ($30.7M) in reported transaction value. The earliest filing StockDrifts holds for PORTERS Corporation is dated 2022-10-03; the most recent is 2026-01-29. Across these filings the average return since disclosure is -26.84%, 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
2026-08-25	BUY	Market Buy	株式会社UH5	passive	4.8K	¥1,429	-	-
2026-08-25	BUY	Market Buy	株式会社UH Partners 2	passive	39.6K	¥1,429	-2.0%	¥24M ($152K)
2026-08-25	BUY	Market Buy	光通信株式会社	passive	121.2K	¥1,429	-	-
2026-05-29	BUY	Market Buy	光通信株式会社	passive	121.2K	¥1,353	-	-
2026-05-29	BUY	Market Buy	株式会社UH Partners 2	passive	23.2K	¥1,353	+3.5%	¥28M ($184K)
2026-05-29	BUY	Market Buy	株式会社UH5	passive	4.8K	¥1,353	-	-
2026-01-29	BUY	Market Buy	光通信株式会社	passive	121.2K	¥1,698	-17.6%	¥21M ($134K)
2026-01-29	BUY	Market Buy	株式会社UH Partners 2	passive	2.1K	¥1,698	-	¥4M ($23K)
2026-01-29	BUY	Market Buy	株式会社UH5	passive	4.8K	¥1,698	-17.6%	¥4M ($25K)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	107.8K	¥1,882	-25.6%	¥19M ($123K)
2025-09-29	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	2.4K	¥1,882	-25.6%	¥5M ($29K)
2025-07-17	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	97.6K	¥1,941	-27.9%	¥32M ($208K)
2025-02-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	80.1K	¥1,896	-26.2%	¥152M ($980K)
2024-04-18	SELL	unknown	西森康二 Nishimori Koji	activist	164.3K	¥2,120	+34.0%	¥75M ($487K)
2024-04-18	SELL	unknown	西森康二 Nishimori Koji	activist	164.3K	¥2,120	+34.0%	¥9M ($57K)
2024-04-18	SELL	unknown	KAキャピタル株式会社 KA Capital Co., Ltd.	activist	750.0K	¥2,120	+34.0%	¥40M ($259K)
2024-04-18	SELL	unknown	KAキャピタル株式会社 KA Capital Co., Ltd.	activist	750.0K	¥2,120	+34.0%	¥40M ($259K)
2022-10-31	SELL	unknown	御子柴智美 Mikoshiba Tomomi	activist	164.2K	¥2,461	+43.1%	¥76M ($490K)
2022-10-31	SELL	unknown	西森康二 Nishimori Koji	activist	164.3K	¥2,461	+43.1%	¥76M ($487K)
2022-10-31	BUY	unknown	KAキャピタル株式会社 KA Capital Co., Ltd.	activist	750.0K	¥2,461	-	-
2022-10-03	BUY	unknown	西森康二 Nishimori Koji	activist	195.0K	¥2,670	-47.6%	¥521M ($3.4M)
2022-10-03	BUY	unknown	西森康二 Nishimori Koji	activist	195.0K	¥2,670	-47.6%	¥521M ($3.4M)
2022-10-03	BUY	unknown	御子柴智美 Mikoshiba Tomomi	activist	195.0K	¥2,670	-47.6%	¥521M ($3.4M)
2022-10-03	BUY	unknown	KAキャピタル株式会社 KA Capital Co., Ltd.	activist	750.0K	¥2,670	-47.6%	¥2.0B ($12.9M)
2022-10-03	BUY	unknown	KAキャピタル株式会社 KA Capital Co., Ltd.	activist	750.0K	¥2,670	-47.6%	¥2.0B ($12.9M)

Frequently asked questions

Who has been buying PORTERS Corporation stock?: 6 distinct investors have filed 11 disclosed large-shareholding filings in PORTERS Corporation (5126), most recently on 2026-01-29. 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 PORTERS Corporation have?: PORTERS Corporation has 11 buy-side and 6 sell-side disclosures on record, covering ¥4.8B ($30.7M) in total reported value, spanning 2022-10-03 to 2026-01-29.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.