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

14 distinct investors have filed 17 disclosed large-shareholding filings in Rengo Co., Ltd. (3941), most recently on 2026-05-14. 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 Rengo Co., Ltd. have?

Rengo Co., Ltd. has 17 buy-side and 8 sell-side disclosures on record, covering ¥43.3B ($279.6M) in total reported value, spanning 2021-06-18 to 2026-05-14.

Where does StockDrifts get Rengo 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.

Rengo Co., Ltd. 3941

Company

レンゴー株式会社Rengo Co., Ltd.

Investors

Buys

Total Value

¥43.3B ($279.6M)

Avg Return

+41.00%

Last Filing

2026-05-14

Rengo Co., Ltd. (3941) has 17 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 14 distinct investors. Together those filings cover ¥43.3B ($279.6M) in reported transaction value. The earliest filing StockDrifts holds for Rengo Co., Ltd. is dated 2021-06-18; the most recent is 2026-05-14. 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 +41.00%, 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
2026-05-14	BUY	unknown	株式会社レノ	activist	1.7M	¥1,385	+0.3%	¥2.4B ($15.2M)
2026-05-14	BUY	unknown	株式会社ATRA	activist	2.7M	¥1,385	+0.3%	¥3.7B ($23.7M)
2026-05-14	BUY	Market Buy	野村絢	activist	11.8M	¥1,385	+0.3%	¥1.5B ($9.4M)
2026-05-14	BUY	unknown	株式会社南青山不動産	activist	244.6K	¥1,385	+0.3%	¥339M ($2.2M)
2026-02-03	BUY	acquisition	株式会社南青山不動産 Minami Aoyama Real Estate Co., Ltd.	activist	13.7M	¥1,366.5	-7.4%	¥18.7B ($120.4M)
2024-10-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	3.5M	¥943.9	-34.0%	¥281M ($1.8M)
2024-10-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	6.2M	¥943.9	-34.0%	¥1.8B ($11.4M)
2024-10-21	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	3.3M	¥943.9	+34.0%	¥3.1B ($19.9M)
2024-06-19	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	13.1M	¥1,012	+25.0%	¥13.2B ($85.4M)
2024-06-19	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	557.2K	¥1,012	+25.0%	¥564M ($3.6M)
2024-06-19	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-26.4K	¥1,012	+25.0%	-
2023-09-22	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	3.8M	¥1,040	-21.6%	¥2.8B ($18.2M)
2023-09-22	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.1M	¥1,040	-21.6%	¥282M ($1.8M)
2023-09-22	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	3.3M	¥1,040	+21.6%	¥3.4B ($21.9M)
2023-07-06	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.4M	¥876.7	-44.3%	¥1.1B ($7.4M)
2023-07-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	6.5M	¥876.7	-44.3%	¥1.4B ($8.9M)
2023-07-06	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	3.3M	¥876.7	+44.3%	¥2.9B ($18.5M)
2022-05-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	16.3K	¥731	+73.0%	¥1.9B ($12.1M)
2022-05-18	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	10.8M	¥731	+73.0%	¥7.8B ($50.2M)
2022-05-18	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	55.6K	¥731	+73.0%	¥3.2B ($20.6M)
2022-05-06	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	488.6K	¥789	+60.3%	¥385M ($2.5M)
2022-05-06	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	324.8K	¥789	+60.3%	¥256M ($1.7M)
2022-05-06	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥789	-60.3%	¥321M ($2.1M)
2022-05-06	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	8.3M	¥789	+60.3%	¥6.5B ($41.6M)
2022-01-20	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.0M	¥869	-45.6%	¥730M ($4.7M)
2022-01-20	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	9.7M	¥869	+45.6%	¥1.4B ($9.0M)
2022-01-20	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	3.3M	¥869	+45.6%	¥2.8B ($18.3M)
2021-10-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.9M	¥864	+46.4%	¥2.3B ($15.0M)
2021-10-21	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.0M	¥864	+46.4%	¥94M ($604K)
2021-10-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	12.5M	¥864	+46.4%	¥10.8B ($69.7M)
2021-10-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.1M	¥864	+46.4%	¥915M ($5.9M)
2021-10-21	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	126.6K	¥864	+46.4%	¥109M ($706K)
2021-10-21	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	3.3M	¥864	+46.4%	¥2.8B ($18.2M)
2021-06-18	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	12.2M	¥929	+36.2%	¥11.2B ($72.3M)
2021-06-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	47.1K	¥929	+36.2%	¥4.6B ($29.7M)

Frequently asked questions

Who has been buying Rengo Co., Ltd. stock?: 14 distinct investors have filed 17 disclosed large-shareholding filings in Rengo Co., Ltd. (3941), most recently on 2026-05-14. 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 Rengo Co., Ltd. have?: Rengo Co., Ltd. has 17 buy-side and 8 sell-side disclosures on record, covering ¥43.3B ($279.6M) in total reported value, spanning 2021-06-18 to 2026-05-14.
Where does StockDrifts get Rengo 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 Rengo Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.