Who has been buying Rinko Corporation stock?

10 distinct investors have filed 13 disclosed large-shareholding filings in Rinko Corporation (9355), most recently on 2025-10-02. 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 Rinko Corporation have?

Rinko Corporation has 13 buy-side and 8 sell-side disclosures on record, covering ¥796M ($5.1M) in total reported value, spanning 2021-07-09 to 2025-10-02.

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.

Rinko Corporation 9355

Company

株式会社リンコーコーポレーションRinko Corporation

Investors

Buys

Total Value

¥796M ($5.1M)

Avg Return

+25.45%

Last Filing

2025-10-02

Rinko Corporation (9355) has 13 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥796M ($5.1M) in reported transaction value. The earliest filing StockDrifts holds for Rinko Corporation is dated 2021-07-09; the most recent is 2025-10-02. Across these filings the average return since disclosure is +25.45%, 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
2026-08-03	BUY	unknown	株式会社みずほ銀行	strategic	134.6K	¥2,278	-	-
2026-08-03	SELL	unknown	みずほ信託銀行株式会社	strategic	193.6K	¥2,278	+4.7%	¥68M ($440K)
2025-10-02	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	134.6K	¥1,823	-	-
2025-10-02	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	223.5K	¥1,823	-19.0%	¥53M ($343K)
2025-01-08	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	134.6K	¥1,713	-	-
2025-01-08	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	252.7K	¥1,713	-26.7%	¥49M ($316K)
2024-04-05	BUY	unknown	三井住友海上火災保険株式会社 Mitsui Sumitomo Insurance Co.,Ltd.	strategic	51.5K	¥1,710	+26.9%	¥86M ($554K)
2024-04-05	SELL	unknown	あいおいニッセイ同和損害保険株式会社 Aioi Nissay Dowa Insurance Co.,Ltd.	strategic	10.0K	¥1,710	-26.9%	¥17M ($110K)
2024-03-28	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	134.6K	¥1,753	-	-
2024-03-28	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	281.3K	¥1,753	+23.8%	¥257M ($1.7M)
2024-03-22	SELL	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	33.4K	¥1,820	-19.2%	¥164M ($1.1M)
2024-03-22	SELL	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	33.4K	¥1,820	-19.2%	¥164M ($1.1M)
2024-03-22	BUY	unknown	神明宮 Shinmei Shrine	corporate	26.0K	¥1,820	-	-
2024-03-22	BUY	unknown	学校法人新潟総合学園 Niigata Sogo Gakuen Educational Corporation	corporate	90.0K	¥1,820	-	¥164M ($1.1M)
2024-03-22	BUY	unknown	神明宮 Shinmei Shrine	corporate	26.0K	¥1,820	-	-
2024-03-22	BUY	unknown	学校法人新潟総合学園 Niigata Sogo Gakuen Educational Corporation	corporate	90.0K	¥1,820	-	¥164M ($1.1M)
2024-01-29	SELL	unknown	学校法人新潟総合学院 Niigata Sogo Gakuin Educational Corporation	corporate	0	¥1,840	-17.9%	¥57M ($369K)
2024-01-29	BUY	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	123.4K	¥1,840	+17.9%	¥81M ($522K)
2024-01-29	BUY	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	123.4K	¥1,840	+17.9%	¥81M ($522K)
2024-01-29	BUY	unknown	神明宮 Shinmei Shrine	corporate	26.0K	¥1,840	-	-
2024-01-29	BUY	unknown	神明宮 Shinmei Shrine	corporate	26.0K	¥1,840	-	-
2024-01-29	BUY	Market Buy	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	123.4K	¥1,840	+17.9%	¥81M ($522K)
2024-01-29	SELL	Market Buy	学校法人新潟総合学院 Niigata Sogo Gakuin Educational Corporation	corporate	0	¥1,840	-17.9%	¥57M ($369K)
2024-01-29	BUY	Market Buy	神明宮 Shinmei Shrine	corporate	26.0K	¥1,840	-	-
2024-01-29	SELL	unknown	学校法人新潟総合学院 Niigata Sogo Gakuin Educational Corporation	corporate	0	¥1,840	-17.9%	¥57M ($369K)
2022-10-05	BUY	negotiated	株式会社第四北越銀行 Daishi Hokuetsu Bank,Ltd.	strategic	134.5K	¥1,444	+50.3%	¥194M ($1.3M)
2022-10-05	BUY	negotiated	第四ジェーシービーカード株式会社 Daishi JCB Card Co., Ltd.	strategic	16.1K	¥1,444	+50.3%	¥23M ($150K)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	134.6K	¥1,710	-	-
2021-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	134.6K	¥1,710	-	-
2021-08-02	BUY	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	79.4K	¥1,780	+21.9%	¥141M ($912K)
2021-08-02	BUY	unknown	学校法人新潟総合学院 Niigata Sogo Gakuin Educational Corporation	corporate	31.0K	¥1,780	+21.9%	¥55M ($356K)
2021-08-02	BUY	unknown	神明宮 Shinmei Shrine	corporate	26.0K	¥1,780	+21.9%	¥46M ($299K)
2021-07-09	BUY	unknown	学校法人国際総合学園 KOKUSAISOUGOUGAKUEN	corporate	79.4K	¥1,808	+20.0%	¥144M ($926K)
2021-07-09	BUY	unknown	学校法人新潟総合学院 Niigata Sogo Gakuin Educational Corporation	corporate	30.6K	¥1,808	+20.0%	¥55M ($357K)
2021-07-09	BUY	unknown	神明宮 Shinmei Shrine	corporate	25.0K	¥1,808	+20.0%	¥45M ($292K)

Frequently asked questions

Who has been buying Rinko Corporation stock?: 10 distinct investors have filed 13 disclosed large-shareholding filings in Rinko Corporation (9355), most recently on 2025-10-02. 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 Rinko Corporation have?: Rinko Corporation has 13 buy-side and 8 sell-side disclosures on record, covering ¥796M ($5.1M) in total reported value, spanning 2021-07-09 to 2025-10-02.
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.