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

9 distinct investors have filed 13 disclosed large-shareholding filings in Nippon Kayaku Co., Ltd. (4272), most recently on 2026-04-16. 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 Kayaku Co., Ltd. have?

Nippon Kayaku Co., Ltd. has 13 buy-side and 20 sell-side disclosures on record, covering ¥17.6B ($113.5M) in total reported value, spanning 2021-03-25 to 2026-04-16.

Where does StockDrifts get Nippon Kayaku 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 Kayaku Co., Ltd. 4272

Company

日本化薬株式会社Nippon Kayaku Co., Ltd.

Investors

Buys

Total Value

¥17.6B ($113.5M)

Avg Return

+44.99%

Last Filing

2026-04-16

Nippon Kayaku Co., Ltd. (4272) has 13 disclosed large-shareholding filings and 20 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥17.6B ($113.5M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Kayaku Co., Ltd. is dated 2021-03-25; the most recent is 2026-04-16. 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 +44.99%, 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
2026-05-27	SELL	unknown	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	7.5M	¥2,154.5	+2.3%	¥3.7B ($24.0M)
2026-04-16	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	9.2M	¥1,795	-16.4%	¥2.9B ($18.7M)
2026-02-02	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	10.8M	¥1,798.5	+1.5%	¥3.0B ($19.5M)
2025-10-09	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	12.5M	¥1,410	-25.6%	¥2.3B ($15.0M)
2025-09-19	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	1.9M	¥1,436.5	-23.3%	¥230M ($1.5M)
2025-09-19	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	5.1M	¥1,436.5	+23.3%	¥345M ($2.2M)
2025-09-19	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.2M	¥1,436.5	-23.3%	¥965M ($6.2M)
2025-07-31	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	14.2M	¥1,415	-25.2%	¥2.5B ($15.9M)
2025-07-03	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	15.9M	¥1,310	-35.2%	¥2.1B ($13.8M)
2025-06-05	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	17.5M	¥1,300	-36.3%	¥2.2B ($14.2M)
2025-04-17	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	19.8M	¥1,296	-36.7%	¥2.2B ($14.5M)
2025-03-21	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	21.6M	¥1,414	-25.3%	¥1.6B ($10.1M)
2025-01-10	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	22.7M	¥1,269	-39.6%	¥2.1B ($13.6M)
2024-10-01	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	25.1M	¥1,255	-41.2%	¥2.1B ($13.8M)
2024-09-11	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	26.9M	¥1,271.5	-39.3%	¥2.3B ($15.1M)
2024-09-11	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	26.9M	¥1,271.5	+39.3%	¥2.3B ($15.1M)
2024-08-21	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	28.7M	¥1,278	-38.6%	¥2.2B ($14.3M)
2024-07-29	SELL	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.2M	¥1,264	-40.1%	¥172M ($1.1M)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	3.9M	¥1,264	-40.1%	¥366M ($2.4M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	5.1M	¥1,264	+40.1%	¥6.4B ($41.5M)
2024-03-22	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.2M	¥1,337.5	+32.5%	¥46M ($294K)
2024-03-22	BUY	Market Buy	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	5.2M	¥1,337.5	+32.5%	¥388M ($2.5M)
2024-03-22	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	2.0M	¥1,337.5	+32.5%	¥91M ($589K)
2024-03-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	5.1M	¥1,317.5	+34.5%	¥6.7B ($43.3M)
2024-03-18	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	1.4M	¥1,317.5	+34.5%	¥562M ($3.6M)
2024-03-18	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.1M	¥1,317.5	-34.5%	¥1.4B ($9.0M)
2023-04-17	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	932.0K	¥1,223	+44.9%	¥1.1B ($7.4M)
2023-04-17	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	5.2M	¥1,223	-44.9%	¥2.1B ($13.9M)
2023-04-17	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	5.1M	¥1,223	+44.9%	¥6.2B ($40.2M)
2022-09-20	SELL	Market Buy	エム・ユー投資顧問株式会社 M.U. Investment Advisors Co., Ltd.	unknown	0	¥1,210	-46.4%	¥516M ($3.3M)
2022-09-20	BUY	Market Buy	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	99.8K	¥1,210	+46.4%	¥11.9B ($77.1M)
2022-09-20	BUY	Market Buy	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	937.7K	¥1,210	+46.4%	¥413M ($2.7M)
2022-09-20	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	7.0M	¥1,210	-46.4%	¥2.0B ($13.2M)
2022-09-20	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	5.1M	¥1,210	+46.4%	¥248M ($1.6M)
2021-11-05	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.3M	¥1,241	+42.8%	¥2.8B ($18.1M)
2021-11-05	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	5.1M	¥1,241	+42.8%	¥6.3B ($40.5M)
2021-11-05	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	2.0M	¥1,241	+42.8%	¥2.5B ($16.2M)
2021-06-11	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	31.7M	¥1,036	+71.0%	¥1.9B ($12.2M)
2021-03-25	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	29.9M	¥925.949	+91.3%	¥1.7B ($11.0M)

Frequently asked questions

Who has been buying Nippon Kayaku Co., Ltd. stock?: 9 distinct investors have filed 13 disclosed large-shareholding filings in Nippon Kayaku Co., Ltd. (4272), most recently on 2026-04-16. 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 Kayaku Co., Ltd. have?: Nippon Kayaku Co., Ltd. has 13 buy-side and 20 sell-side disclosures on record, covering ¥17.6B ($113.5M) in total reported value, spanning 2021-03-25 to 2026-04-16.
Where does StockDrifts get Nippon Kayaku 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 Kayaku Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.