Who has been buying Nitto Kohki Co., Ltd. stock?

9 distinct investors have filed 21 disclosed large-shareholding filings in Nitto Kohki Co., Ltd. (6151), most recently on 2026-05-13. 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 Nitto Kohki Co., Ltd. have?

Nitto Kohki Co., Ltd. has 21 buy-side and 5 sell-side disclosures on record, covering ¥5.6B ($36.3M) in total reported value, spanning 2021-04-08 to 2026-05-13.

Where does StockDrifts get Nitto Kohki 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.

Nitto Kohki Co., Ltd. 6151

Company

日東工器株式会社Nitto Kohki Co., Ltd.

Investors

Buys

Total Value

¥5.6B ($36.3M)

Avg Return

-12.43%

Last Filing

2026-05-13

Nitto Kohki Co., Ltd. (6151) has 21 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥5.6B ($36.3M) in reported transaction value. The earliest filing StockDrifts holds for Nitto Kohki Co., Ltd. is dated 2021-04-08; the most recent is 2026-05-13. 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 -12.43%, 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
2026-05-13	BUY	unknown	有限会社ミキヤエンタープライズ	strategic	415.4K	¥1,668	-1.7%	¥693M ($4.5M)
2026-05-13	BUY	unknown	御器谷春子	strategic	687.3K	¥1,668	-1.7%	¥1.1B ($7.4M)
2026-05-13	BUY	Market Buy	株式会社日器	strategic	7.3M	¥1,668	-1.7%	¥1.5B ($9.5M)
2026-05-13	BUY	Market Buy	有限会社ミキヤコーポレーション	strategic	565.1K	¥1,668	-1.7%	¥115M ($742K)
2026-05-13	BUY	Market Buy	高田楊子	strategic	646.1K	¥1,668	-1.7%	¥61M ($392K)
2026-01-23	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	activist	2.5M	¥1,928	-13.4%	¥369M ($2.4M)
2025-12-01	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	activist	2.3M	¥1,620	+3.0%	¥391M ($2.5M)
2025-12-01	SELL	negotiated	三菱UFJアセットマネジメント株式会社	passive	146.4K	¥1,620	-3.0%	¥244M ($1.6M)
2025-12-01	SELL	negotiated	三菱UFJ信託銀行株式会社	passive	234.4K	¥1,620	-3.0%	¥391M ($2.5M)
2025-12-01	SELL	negotiated	株式会社三菱UFJ銀行	strategic	58	¥1,620	-3.0%	¥97K ($625)
2025-10-17	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	activist	2.1M	¥1,720	-3.0%	¥241M ($1.6M)
2025-05-30	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	activist	2.0M	¥1,807	-7.6%	¥370M ($2.4M)
2025-03-31	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	596.8K	¥1,840	-9.3%	¥1.1B ($7.1M)
2025-03-31	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	149.6K	¥1,840	-9.3%	¥275M ($1.8M)
2025-03-31	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	264.8K	¥1,840	-9.3%	¥487M ($3.1M)
2025-01-22	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	passive	1.9M	¥2,328	-28.3%	¥493M ($3.2M)
2024-10-22	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	passive	1.7M	¥2,515	-33.6%	¥731M ($4.7M)
2024-09-24	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	passive	1.4M	¥2,444	-31.7%	¥756M ($4.9M)
2024-07-29	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	157.8K	¥2,251	-25.9%	¥5M ($30K)
2024-07-29	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	596.8K	¥2,251	-25.9%	¥65M ($422K)
2024-07-29	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	280.0K	¥2,251	+25.9%	¥182M ($1.2M)
2024-07-05	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte.Ltd.	passive	1.1M	¥2,231	-25.2%	¥2.4B ($15.8M)
2021-05-24	BUY	Market Buy	株式会社日器 NIKKI CO.,LTD	strategic	7.3M	¥1,942	-14.1%	¥1.3B ($8.1M)
2021-04-08	BUY	unknown	有限会社ミキヤコーポレーション MIKIYA CORPORATION LIMITED.	strategic	565.1K	¥1,936	-13.8%	¥1.1B ($7.1M)
2021-04-08	BUY	unknown	株式会社日器 NIKKI CO.,LTD	strategic	6.6M	¥1,936	-13.8%	¥12.8B ($82.7M)
2021-04-08	SELL	unknown	御器谷俊雄(相続人代表高田揚子) Toshio Okitani (Heir Representative Yoko Takada)	unknown	0	¥1,936	+13.8%	¥3.7B ($24.1M)
2021-04-08	BUY	unknown	高田揚子 Yoko Takada	strategic	694.0K	¥1,936	-13.8%	¥1.3B ($8.7M)

Frequently asked questions

Who has been buying Nitto Kohki Co., Ltd. stock?: 9 distinct investors have filed 21 disclosed large-shareholding filings in Nitto Kohki Co., Ltd. (6151), most recently on 2026-05-13. 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 Nitto Kohki Co., Ltd. have?: Nitto Kohki Co., Ltd. has 21 buy-side and 5 sell-side disclosures on record, covering ¥5.6B ($36.3M) in total reported value, spanning 2021-04-08 to 2026-05-13.
Where does StockDrifts get Nitto Kohki 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 Nitto Kohki Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.