Who has been buying Nippon Kodoshi Corporation stock?

15 distinct investors have filed 16 disclosed large-shareholding filings in Nippon Kodoshi Corporation (3891), 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 Nippon Kodoshi Corporation have?

Nippon Kodoshi Corporation has 16 buy-side and 6 sell-side disclosures on record, covering ¥3.9B ($25.0M) in total reported value, spanning 2021-11-22 to 2026-05-12.

Where does StockDrifts get Nippon Kodoshi Corporation 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 Kodoshi Corporation 3891

Company

ニッポン高度紙工業株式会社Nippon Kodoshi Corporation

Investors

Buys

Total Value

¥3.9B ($25.0M)

Avg Return

+40.73%

Last Filing

2026-05-12

Nippon Kodoshi Corporation (3891) has 16 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥3.9B ($25.0M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Kodoshi Corporation is dated 2021-11-22; 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 +40.73%, 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
2026-08-06	BUY	Market Buy	野村アセットマネジメント株式会社	other	546.3K	¥7,180	+0.1%	¥653M ($4.2M)
2026-08-06	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	295.6K	¥7,180	-0.1%	¥1.5B ($9.9M)
2026-08-06	BUY	Market Buy	野村證券株式会社	other	32.5K	¥7,180	+0.1%	¥215M ($1.4M)
2026-07-06	SELL	unknown	野村アセットマネジメント株式会社	other	456.1K	¥8,620	+15.2%	¥314M ($2.0M)
2026-07-06	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	507.8K	¥8,620	-15.2%	¥2.8B ($18.3M)
2026-07-06	SELL	unknown	野村證券株式会社	other	1.7K	¥8,620	+15.2%	¥175M ($1.1M)
2026-06-22	SELL	Market Buy	三井住友DSアセットマネジメント株式会社	passive	323.8K	¥10,200	+31.9%	¥2.0B ($12.7M)
2026-06-22	SELL	unknown	株式会社三井住友銀行	other	0	¥10,200	+31.9%	¥404M ($2.6M)
2026-06-19	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	179.5K	¥10,750	-35.4%	¥2.0B ($12.7M)
2026-06-19	SELL	unknown	野村アセットマネジメント株式会社	other	491.8K	¥10,750	+35.4%	¥702M ($4.5M)
2026-06-19	SELL	unknown	野村證券株式会社	other	22.2K	¥10,750	+35.4%	¥81M ($519K)
2026-05-12	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	518.3K	¥6,330	+44.9%	¥3.3B ($21.2M)
2026-05-12	BUY	unknown	株式会社三井住友銀行	other	39.6K	¥6,330	+44.9%	¥251M ($1.6M)
2026-04-06	BUY	unknown	野村アセットマネジメント株式会社	other	557.6K	¥3,775	+61.9%	¥2.1B ($13.6M)
2026-04-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-2.7K	¥3,775	+61.9%	-
2026-04-06	BUY	unknown	野村證券株式会社	other	30.2K	¥3,775	+61.9%	¥114M ($737K)
2026-03-05	SELL	unknown	野村證券株式会社	other	9.1K	¥4,225	-4.0%	¥40M ($257K)
2026-03-05	BUY	unknown	野村アセットマネジメント株式会社	other	480.1K	¥4,225	+4.0%	¥2.1B ($13.6M)
2026-03-05	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	40.2K	¥4,225	+4.0%	¥176M ($1.1M)
2026-02-10	BUY	Market Buy	王子グリーンリソース株式会社	strategic	5.4K	¥3,390	-29.6%	¥24M ($153K)
2026-02-10	SELL	Market Buy	王子エフテックス株式会社	strategic	37.8K	¥3,390	-29.6%	¥166M ($1.1M)
2026-02-10	BUY	Market Buy	王子イメージングメディア株式会社	strategic	56.0K	¥3,390	+29.6%	¥246M ($1.6M)
2026-02-10	SELL	Market Buy	本州電材株式会社	strategic	67.6K	¥3,390	-29.6%	¥297M ($1.9M)
2026-02-10	BUY	Market Buy	王子製紙株式会社	strategic	422.2K	¥3,390	+29.6%	¥1.9B ($12.0M)
2026-02-10	BUY	Market Buy	王子マネジメントオフィス株式会社	strategic	493.4K	¥3,390	+29.6%	¥2.2B ($14.0M)
2026-02-04	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	560.3K	¥3,065	+43.4%	¥13M ($85K)
2026-01-21	BUY	unknown	野村アセットマネジメント株式会社	other	455.3K	¥3,520	+24.9%	¥2.0B ($12.9M)
2026-01-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	52.0K	¥3,520	+24.9%	¥229M ($1.5M)
2026-01-21	BUY	unknown	野村證券株式会社	other	48.9K	¥3,520	+24.9%	¥215M ($1.4M)
2025-12-05	SELL	Market Buy	株式会社SBI証券	other	54.4K	¥2,835	-55.0%	¥239M ($1.5M)
2025-12-05	SELL	Market Buy	SBIアセットマネジメント株式会社	passive	310.0K	¥2,835	-55.0%	¥1.4B ($8.8M)
2025-01-10	BUY	Market Buy	SBIアセットマネジメント株式会社 SBI Asset Management Co., Ltd.	passive	480.0K	¥1,917	+129.3%	¥920M ($5.9M)
2025-01-10	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	80.8K	¥1,917	+129.3%	¥155M ($1000K)
2022-06-24	BUY	negotiated	本州電材株式会社 Honshu Electric Materials Co., Ltd.	strategic	196.6K	¥1,958	+124.5%	¥385M ($2.5M)
2022-06-24	BUY	negotiated	王子エフテックス株式会社 Oji F-Tex Co., Ltd.	strategic	42.0K	¥1,958	+124.5%	¥82M ($531K)
2022-06-24	BUY	negotiated	王子マネジメントオフィス株式会社 Oji Management Office Inc.	strategic	493.4K	¥1,958	+124.5%	¥966M ($6.2M)
2022-06-24	BUY	negotiated	王子イメージングメディア株式会社 Oji Imaging Media Co., Ltd.	strategic	56.0K	¥1,958	+124.5%	¥110M ($707K)
2022-06-24	BUY	negotiated	王子グリーンリソース株式会社 Oji Green Resources Co., Ltd.	strategic	5.4K	¥1,958	+124.5%	¥11M ($68K)
2022-06-24	BUY	negotiated	王子製紙株式会社 Oji Paper Co., Ltd.	strategic	422.2K	¥1,958	+124.5%	¥827M ($5.3M)
2022-06-24	BUY	negotiated	王子ホールディングス株式会社 Oji Holdings Corporation	strategic	316	¥1,958	+124.5%	¥619K ($4K)
2021-11-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	365.4K	¥2,881	-52.5%	¥536M ($3.5M)

Frequently asked questions

Who has been buying Nippon Kodoshi Corporation stock?: 15 distinct investors have filed 16 disclosed large-shareholding filings in Nippon Kodoshi Corporation (3891), 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 Nippon Kodoshi Corporation have?: Nippon Kodoshi Corporation has 16 buy-side and 6 sell-side disclosures on record, covering ¥3.9B ($25.0M) in total reported value, spanning 2021-11-22 to 2026-05-12.
Where does StockDrifts get Nippon Kodoshi Corporation 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 Kodoshi Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.