Who has been buying Chugai Ro Co., Ltd. stock?

8 distinct investors have filed 13 disclosed large-shareholding filings in Chugai Ro Co., Ltd. (1964), most recently on 2026-05-12. 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 Chugai Ro Co., Ltd. have?

Chugai Ro Co., Ltd. has 13 buy-side and 9 sell-side disclosures on record, covering ¥1.1B ($7.3M) in total reported value, spanning 2021-10-21 to 2026-05-12.

Where does StockDrifts get Chugai Ro 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.

Chugai Ro Co., Ltd. 1964

Company

中外炉工業株式会社Chugai Ro Co., Ltd.

Investors

Buys

Total Value

¥1.1B ($7.3M)

Avg Return

+84.35%

Last Filing

2026-05-12

Chugai Ro Co., Ltd. (1964) has 13 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥1.1B ($7.3M) in reported transaction value. The earliest filing StockDrifts holds for Chugai Ro Co., Ltd. is dated 2021-10-21; the most recent is 2026-05-12. 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 +84.35%, 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
2026-06-22	SELL	negotiated	株式会社関西みらい銀行	strategic	39.9K	¥4,115	+6.6%	¥3M ($21K)
2026-06-22	SELL	unknown	りそなアセットマネジメント株式会社	other	77.5K	¥4,115	+6.6%	¥10M ($62K)
2026-06-22	SELL	negotiated	株式会社りそな銀行	strategic	359.1K	¥4,115	+6.6%	¥921M ($5.9M)
2026-06-05	SELL	unknown	りそなアセットマネジメント株式会社	other	79.5K	¥4,130	+1.6%	¥3M ($21K)
2026-06-05	BUY	negotiated	株式会社関西みらい銀行	strategic	40.6K	¥4,130	-1.6%	¥168M ($1.1M)
2026-06-05	BUY	Market Buy	株式会社りそな銀行	strategic	582.6K	¥4,130	-1.6%	¥409M ($2.6M)
2026-05-22	BUY	negotiated	株式会社関西みらい銀行	strategic	40.6K	¥4,240	-4.6%	¥172M ($1.1M)
2026-05-22	BUY	unknown	りそなアセットマネジメント株式会社	other	80.0K	¥4,240	-4.6%	¥339M ($2.2M)
2026-05-22	BUY	Market Buy	株式会社りそな銀行	strategic	483.6K	¥4,240	-4.6%	¥420M ($2.7M)
2026-05-21	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	512.2K	¥4,220	+6.4%	¥467M ($3.0M)
2026-05-12	BUY	negotiated	株式会社関西みらい銀行	strategic	40.6K	¥4,555	-9.3%	¥185M ($1.2M)
2026-05-12	SELL	unknown	りそなアセットマネジメント株式会社	other	80.2K	¥4,555	+9.3%	¥195M ($1.3M)
2026-05-12	BUY	Market Buy	株式会社りそな銀行	strategic	384.5K	¥4,555	-9.3%	¥96M ($619K)
2025-09-19	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	623.2K	¥4,245	+2.9%	¥543M ($3.5M)
2025-05-21	BUY	negotiated	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥3,520	+24.1%	¥143M ($923K)
2025-05-21	SELL	negotiated	株式会社りそな銀行 Resona Bank, Limited.	strategic	363.6K	¥3,520	-24.1%	¥49M ($319K)
2025-05-21	BUY	negotiated	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	123.1K	¥3,520	+24.1%	¥433M ($2.8M)
2025-05-09	BUY	Market Buy	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥3,910	+11.8%	¥159M ($1.0M)
2025-05-09	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	123.5K	¥3,910	+11.8%	¥18M ($118K)
2025-05-09	BUY	Market Buy	株式会社りそな銀行 Resona Bank, Limited.	strategic	377.2K	¥3,910	+11.8%	¥6M ($39K)
2025-04-04	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	495.4K	¥3,190	+37.0%	¥256M ($1.7M)
2025-02-06	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	415.1K	¥3,410	+28.1%	¥1.4B ($9.1M)
2024-12-05	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	92.8K	¥3,410	-28.1%	¥74M ($480K)
2024-12-05	SELL	negotiated	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	154.0K	¥3,410	-28.1%	¥149M ($961K)
2024-12-05	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	42.2K	¥3,410	-28.1%	¥144M ($927K)
2023-09-06	BUY	negotiated	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥2,114	+106.7%	¥86M ($554K)
2023-09-06	BUY	negotiated	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	118.3K	¥2,114	+106.7%	¥250M ($1.6M)
2023-09-06	SELL	negotiated	株式会社りそな銀行 Resona Bank, Limited.	strategic	376.2K	¥2,114	-106.7%	¥200M ($1.3M)
2023-08-21	BUY	Market Buy	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥2,020	+116.3%	¥82M ($530K)
2023-08-21	BUY	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	118.2K	¥2,020	+116.3%	¥6M ($41K)
2023-08-21	BUY	Market Buy	株式会社りそな銀行 Resona Bank, Limited.	strategic	470.3K	¥2,020	+116.3%	¥191M ($1.2M)
2023-06-06	BUY	negotiated	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥2,062	+111.9%	¥84M ($541K)
2023-06-06	BUY	negotiated	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	115.1K	¥2,062	+111.9%	¥237M ($1.5M)
2023-06-06	SELL	negotiated	株式会社りそな銀行 Resona Bank, Limited.	strategic	376.2K	¥2,062	-111.9%	¥27M ($176K)
2023-05-19	BUY	Market Buy	株式会社りそな銀行 Resona Bank, Limited.	strategic	389.4K	¥1,926	+126.9%	¥17M ($107K)
2023-05-19	BUY	Market Buy	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥1,926	+126.9%	¥78M ($505K)
2023-05-19	SELL	Market Buy	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	115.1K	¥1,926	-126.9%	¥2M ($10K)
2022-06-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	84.3K	¥1,671	+161.5%	¥141M ($909K)
2022-06-21	BUY	negotiated	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	115.9K	¥1,671	+161.5%	¥133M ($858K)
2022-06-21	BUY	negotiated	株式会社関西みらい銀行 Kansai Mirai Bank, Ltd.	strategic	40.6K	¥1,671	+161.5%	¥68M ($438K)
2022-06-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	114.9K	¥1,671	+161.5%	¥192M ($1.2M)
2022-06-21	BUY	negotiated	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	197.4K	¥1,671	+161.5%	¥330M ($2.1M)
2022-06-21	BUY	negotiated	株式会社りそな銀行 Resona Bank, Limited.	strategic	380.6K	¥1,671	+161.5%	¥636M ($4.1M)
2021-10-21	SELL	Market Buy	第一生命保険株式会社 The Dai-ichi Life Insurance Company, Limited	passive	383.7K	¥1,730	-152.6%	¥140M ($905K)

Frequently asked questions

Who has been buying Chugai Ro Co., Ltd. stock?: 8 distinct investors have filed 13 disclosed large-shareholding filings in Chugai Ro Co., Ltd. (1964), most recently on 2026-05-12. 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 Chugai Ro Co., Ltd. have?: Chugai Ro Co., Ltd. has 13 buy-side and 9 sell-side disclosures on record, covering ¥1.1B ($7.3M) in total reported value, spanning 2021-10-21 to 2026-05-12.
Where does StockDrifts get Chugai Ro 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 Chugai Ro Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.