Who has been buying POPER Co.,Ltd. stock?

8 distinct investors have filed 14 disclosed large-shareholding filings in POPER Co.,Ltd. (5134), most recently on 2026-04-07. 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 POPER Co.,Ltd. have?

POPER Co.,Ltd. has 14 buy-side and 6 sell-side disclosures on record, covering ¥1.9B ($12.2M) in total reported value, spanning 2022-11-15 to 2026-04-07.

Where does StockDrifts get POPER 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.

POPER Co.,Ltd. 5134

Company

株式会社POPERPOPER Co.,Ltd.

Investors

Buys

Total Value

¥1.9B ($12.2M)

Avg Return

-20.33%

Last Filing

2026-04-07

POPER Co.,Ltd. (5134) has 14 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥1.9B ($12.2M) in reported transaction value. The earliest filing StockDrifts holds for POPER Co.,Ltd. is dated 2022-11-15; the most recent is 2026-04-07. 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 -20.33%, 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
2026-06-19	BUY	Market Buy	株式会社UH6	passive	255.6K	¥467	+13.3%	¥119M ($770K)
2026-06-19	BUY	Market Buy	株式会社EPARK	passive	92.4K	¥467	+13.3%	¥11M ($72K)
2026-06-19	BUY	Market Buy	株式会社UH Partners 2	passive	75.4K	¥467	+13.3%	¥8M ($50K)
2026-06-19	BUY	Market Buy	光通信株式会社	passive	39.4K	¥467	+13.3%	¥18M ($119K)
2026-04-07	BUY	Market Buy	株式会社UH Partners 2	passive	58.9K	¥543	-9.0%	¥2M ($11K)
2026-04-07	BUY	Market Buy	株式会社EPARK	passive	68.1K	¥543	-9.0%	¥13M ($86K)
2026-04-07	BUY	Market Buy	株式会社UH6	passive	255.6K	¥543	-9.0%	¥139M ($895K)
2026-04-07	SELL	Market Buy	光通信株式会社	passive	39.4K	¥543	+9.0%	¥139M ($895K)
2026-04-01	BUY	Market Buy	株式会社EPARK	passive	43.7K	¥525	-6.3%	¥16M ($102K)
2026-04-01	BUY	Market Buy	株式会社UH Partners 2	passive	55.5K	¥525	-6.3%	¥6M ($39K)
2026-04-01	BUY	Market Buy	光通信株式会社	passive	295.0K	¥525	-6.3%	¥155M ($999K)
2026-03-05	BUY	Market Buy	株式会社EPARK	passive	13.7K	¥470	-19.1%	¥8M ($49K)
2026-03-05	BUY	Market Buy	株式会社UH Partners 2	passive	44.3K	¥470	+19.1%	¥25M ($160K)
2026-03-05	BUY	Market Buy	光通信株式会社	passive	295.0K	¥470	-19.1%	¥165M ($1.1M)
2025-11-07	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	165.7K	¥861	+35.0%	¥34M ($219K)
2025-10-21	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	205.3K	¥975	+42.6%	¥28M ($179K)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	17.0K	¥1,010	-44.5%	¥6M ($36K)
2025-09-29	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	295.0K	¥1,010	+44.5%	¥2M ($10K)
2025-03-21	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	232.9K	¥884	-36.6%	¥206M ($1.3M)
2024-08-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	11.3K	¥584	-4.1%	¥7M ($43K)
2024-08-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	295.0K	¥584	-4.1%	¥20M ($129K)
2024-03-29	SELL	unknown	栗原慎吾 Shingo Kurihara	activist	1.1M	¥661	+15.3%	¥29M ($184K)
2023-09-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	259.5K	¥722	-22.4%	¥45M ($291K)
2023-09-07	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	197.1K	¥671	-16.5%	¥132M ($853K)
2023-02-14	BUY	Market Buy	学校法人駿河台学園理事長山﨑良子 Surugadaigakuen	strategic	564.5K	¥759	-26.2%	¥69M ($442K)
2023-02-14	BUY	unknown	学校法人駿河台学園理事長山﨑良子 Surugadaigakuen	strategic	564.5K	¥759	-26.2%	¥69M ($442K)
2022-11-30	BUY	negotiated	学校法人駿河台学園 surugadaigakuen	strategic	464.5K	¥859	-34.8%	¥399M ($2.6M)
2022-11-21	SELL	Market Buy	大和企業投資株式会社 Daiwa Corporate Investment Co., Ltd.	passive	188.8K	¥904	+38.0%	¥156M ($1.0M)
2022-11-17	BUY	Market Buy	大和企業投資株式会社 Daiwa Corporate Investment Co., Ltd.	passive	361.2K	¥998	-43.9%	¥360M ($2.3M)
2022-11-15	BUY	unknown	栗原慎吾 Shingo Kurihara	activist	1.1M	¥999	-43.9%	¥1.1B ($7.4M)

Frequently asked questions

Who has been buying POPER Co.,Ltd. stock?: 8 distinct investors have filed 14 disclosed large-shareholding filings in POPER Co.,Ltd. (5134), most recently on 2026-04-07. 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 POPER Co.,Ltd. have?: POPER Co.,Ltd. has 14 buy-side and 6 sell-side disclosures on record, covering ¥1.9B ($12.2M) in total reported value, spanning 2022-11-15 to 2026-04-07.
Where does StockDrifts get POPER 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 POPER Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.