Who has been buying Nippon Carbon Co., Ltd. stock?

9 distinct investors have filed 21 disclosed large-shareholding filings in Nippon Carbon Co., Ltd. (5302), most recently on 2026-04-06. 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 Nippon Carbon Co., Ltd. have?

Nippon Carbon Co., Ltd. has 21 buy-side and 13 sell-side disclosures on record, covering ¥8.8B ($56.9M) in total reported value, spanning 2021-03-19 to 2026-04-06.

Where does StockDrifts get Nippon Carbon 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.

Nippon Carbon Co., Ltd. 5302

Company

日本カーボン株式会社Nippon Carbon Co., Ltd.

Investors

Buys

Total Value

¥8.8B ($56.9M)

Avg Return

+10.40%

Last Filing

2026-04-06

Nippon Carbon Co., Ltd. (5302) has 21 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥8.8B ($56.9M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Carbon Co., Ltd. is dated 2021-03-19; the most recent is 2026-04-06. 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 +10.40%, 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
2026-04-06	SELL	Market Buy	野村アセットマネジメント株式会社	other	468.7K	¥4,715	-1.1%	¥457M ($3.0M)
2026-04-06	BUY	Market Buy	野村證券株式会社	other	6.8K	¥4,715	+1.1%	¥39M ($252K)
2026-04-06	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-13.7K	¥4,715	-1.1%	¥206M ($1.3M)
2025-03-21	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-800	¥4,230	+12.9%	-
2025-03-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	565.8K	¥4,230	+12.9%	¥2.4B ($15.4M)
2025-03-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	29.0K	¥4,230	+12.9%	¥123M ($792K)
2025-03-05	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	547.7K	¥4,085	+16.9%	¥77M ($499K)
2025-03-05	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	30.8K	¥4,085	-16.9%	¥68M ($437K)
2025-03-05	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-702	¥4,085	-16.9%	¥11.6B ($74.9M)
2024-08-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	529.5K	¥4,365	+9.4%	¥2.3B ($14.9M)
2024-08-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	47.2K	¥4,365	+9.4%	¥206M ($1.3M)
2024-08-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	28.3K	¥4,365	+9.4%	¥124M ($797K)
2024-07-04	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	498.7K	¥5,310	+10.1%	¥113M ($730K)
2024-07-04	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-4.1K	¥5,310	+10.1%	¥748M ($4.8M)
2024-07-04	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	49.1K	¥5,310	-10.1%	¥260M ($1.7M)
2024-04-04	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	519.3K	¥5,380	+11.3%	¥267M ($1.7M)
2024-04-04	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	137.2K	¥5,380	-11.3%	¥586M ($3.8M)
2023-12-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	568.9K	¥4,570	+4.5%	¥2.6B ($16.6M)
2023-12-20	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	28.4K	¥4,570	-4.5%	¥168M ($1.1M)
2023-11-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	551.7K	¥4,605	+3.7%	¥2.5B ($16.4M)
2023-11-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	241.1K	¥4,605	-3.7%	¥670M ($4.3M)
2023-11-22	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	59.6K	¥4,605	-3.7%	¥5M ($35K)
2022-07-22	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	160.4K	¥4,040	+18.2%	¥10M ($62K)
2022-07-22	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	415.6K	¥4,040	-18.2%	¥272M ($1.8M)
2022-06-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	657.7K	¥4,180	+14.2%	¥336M ($2.2M)
2022-06-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	65.3K	¥4,180	+14.2%	¥287M ($1.9M)
2022-06-21	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	400	¥4,180	-14.2%	¥79M ($511K)
2022-02-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	387.1K	¥4,125	-15.8%	¥508M ($3.3M)
2022-02-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	60.9K	¥4,125	+15.8%	¥251M ($1.6M)
2022-02-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	551.7K	¥4,125	+15.8%	¥2.3B ($14.7M)
2022-01-11	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-3.0K	¥4,205	+13.6%	-
2022-01-11	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	19.3K	¥4,205	+13.6%	¥81M ($524K)
2022-01-11	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	577.6K	¥4,205	+13.6%	¥2.4B ($15.7M)
2021-04-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	510.2K	¥4,790	-0.3%	¥810M ($5.2M)
2021-04-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	60.9K	¥4,790	-0.3%	¥79M ($512K)
2021-04-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.1K	¥4,790	-0.3%	¥2.2B ($14.1M)
2021-04-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	551.7K	¥4,790	-0.3%	¥2.6B ($17.1M)
2021-03-19	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	158.4K	¥3,758.677	+27.0%	¥595M ($3.8M)
2021-03-19	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	482.6K	¥3,758.677	+27.0%	¥1.8B ($11.7M)

Frequently asked questions

Who has been buying Nippon Carbon Co., Ltd. stock?: 9 distinct investors have filed 21 disclosed large-shareholding filings in Nippon Carbon Co., Ltd. (5302), most recently on 2026-04-06. 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 Nippon Carbon Co., Ltd. have?: Nippon Carbon Co., Ltd. has 21 buy-side and 13 sell-side disclosures on record, covering ¥8.8B ($56.9M) in total reported value, spanning 2021-03-19 to 2026-04-06.
Where does StockDrifts get Nippon Carbon 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 Nippon Carbon Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.