Who has been buying Keiyo Gas Co., Ltd. stock?

9 distinct investors have filed 7 disclosed large-shareholding filings in Keiyo Gas Co., Ltd. (9539), most recently on 2025-09-29. 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 Keiyo Gas Co., Ltd. have?

Keiyo Gas Co., Ltd. has 7 buy-side and 0 sell-side disclosures on record, covering ¥990M ($6.4M) in total reported value, spanning 2023-06-22 to 2025-09-29.

Where does StockDrifts get Keiyo Gas 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.

Keiyo Gas Co., Ltd. 9539

Company

京葉瓦斯株式会社Keiyo Gas Co., Ltd.

Investors

Buys

Total Value

¥990M ($6.4M)

Avg Return

+27.81%

Last Filing

2025-09-29

Keiyo Gas Co., Ltd. (9539) has 7 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥990M ($6.4M) in reported transaction value. The earliest filing StockDrifts holds for Keiyo Gas Co., Ltd. is dated 2023-06-22; the most recent is 2025-09-29. 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 +27.81%, 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
2025-09-29	BUY	Market Buy	株式会社ザッパラス Zappalas Co., Ltd.	passive	65.7K	¥1,219	+7.9%	¥80M ($517K)
2025-09-29	BUY	Market Buy	さくら損害保険株式会社 Sakura General Insurance Co., Ltd.	passive	105.7K	¥1,219	+7.9%	¥129M ($831K)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	593.0K	¥1,219	+7.9%	¥264M ($1.7M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.5M	¥1,219	+7.9%	¥3.0B ($19.3M)
2025-04-24	BUY	Market Buy	株式会社ザッパラス Zappalas Co., Ltd.	passive	65.7K	¥1,224	+7.4%	¥80M ($519K)
2025-04-24	BUY	Market Buy	さくら損害保険株式会社 Sakura General Insurance Co., Ltd.	passive	105.7K	¥1,224	+7.4%	¥32M ($207K)
2025-04-24	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	378.1K	¥1,224	+7.4%	¥289M ($1.9M)
2025-04-24	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.5M	¥1,224	+7.4%	¥3.0B ($19.4M)
2025-03-06	BUY	Market Buy	さくら損害保険株式会社 Sakura General Insurance Co., Ltd.	passive	79.6K	¥1,020	+28.9%	¥81M ($524K)
2025-03-06	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	140.0K	¥1,020	+28.9%	¥143M ($921K)
2025-03-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.5M	¥1,020	+28.9%	¥117M ($756K)
2025-01-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.3M	¥878	+49.8%	¥320M ($2.1M)
2024-11-13	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	656.7K	¥859.33	+53.0%	¥95M ($612K)
2024-04-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	547.0K	¥938	+40.2%	¥513M ($3.3M)
2023-06-22	BUY	negotiated	株式会社エス・シー・シー SCC Co., Ltd.	strategic	20.0K	¥852.33	+54.3%	¥17M ($110K)
2023-06-22	BUY	negotiated	ケージェイリビング株式会社 KJ Living Co., Ltd.	strategic	20.0K	¥852.33	+54.3%	¥17M ($110K)
2023-06-22	BUY	negotiated	新日本設備株式会社 Shin Nippon Seki Co., Ltd.	strategic	49.0K	¥852.33	+54.3%	¥42M ($269K)
2023-06-22	BUY	negotiated	京葉産業株式会社 Keiyo Sangyo Co., Ltd.	strategic	60.0K	¥852.33	+54.3%	¥51M ($330K)
2023-06-22	BUY	negotiated	株式会社エス・シー・シー SCC Co., Ltd.	strategic	20.0K	¥852.33	+54.3%	¥17M ($110K)
2023-06-22	BUY	negotiated	ケージェイリビング株式会社 KJ Living Co., Ltd.	strategic	20.0K	¥852.33	+54.3%	¥17M ($110K)
2023-06-22	BUY	negotiated	新日本設備株式会社 Shin Nippon Seki Co., Ltd.	strategic	49.0K	¥852.33	+54.3%	¥42M ($269K)
2023-06-22	BUY	negotiated	京葉産業株式会社 Keiyo Sangyo Co., Ltd.	strategic	60.0K	¥852.33	+54.3%	¥51M ($330K)
2023-06-22	BUY	negotiated	京葉住設株式会社 KEIYO JUSETSU CO.,LTD.	strategic	600.1K	¥852.33	+54.3%	¥511M ($3.3M)
2023-06-22	BUY	negotiated	京葉住設株式会社 KEIYO JUSETSU CO.,LTD.	strategic	600.1K	¥852.33	+54.3%	¥511M ($3.3M)

Frequently asked questions

Who has been buying Keiyo Gas Co., Ltd. stock?: 9 distinct investors have filed 7 disclosed large-shareholding filings in Keiyo Gas Co., Ltd. (9539), most recently on 2025-09-29. 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 Keiyo Gas Co., Ltd. have?: Keiyo Gas Co., Ltd. has 7 buy-side and 0 sell-side disclosures on record, covering ¥990M ($6.4M) in total reported value, spanning 2023-06-22 to 2025-09-29.
Where does StockDrifts get Keiyo Gas 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 Keiyo Gas Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.