Who has been buying Tokyo Ohka Kogyo Co., Ltd. stock?

10 distinct investors have filed 13 disclosed large-shareholding filings in Tokyo Ohka Kogyo Co., Ltd. (4186), most recently on 2026-02-05. 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 Tokyo Ohka Kogyo Co., Ltd. have?

Tokyo Ohka Kogyo Co., Ltd. has 13 buy-side and 10 sell-side disclosures on record, covering ¥17.6B ($113.9M) in total reported value, spanning 2021-11-30 to 2026-02-05.

Where does StockDrifts get Tokyo Ohka Kogyo 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.

Tokyo Ohka Kogyo Co., Ltd. 4186

Company

東京応化工業株式会社Tokyo Ohka Kogyo Co., Ltd.

Investors

Buys

Total Value

¥17.6B ($113.9M)

Avg Return

+224.76%

Last Filing

2026-02-05

Tokyo Ohka Kogyo Co., Ltd. (4186) has 13 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥17.6B ($113.9M) in reported transaction value. The earliest filing StockDrifts holds for Tokyo Ohka Kogyo Co., Ltd. is dated 2021-11-30; the most recent is 2026-02-05. 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 +224.76%, 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
2026-02-05	SELL	unknown	東京海上日動火災保険株式会社 Tokio Marine & Nichido Fire Insurance Co., Ltd.	strategic	5.0M	¥7,408	-20.9%	¥10.4B ($67.2M)
2025-09-04	BUY	unknown	東京海上アセットマネジメント株式会社 Tokio Marine Asset Management Co.,Ltd.	passive	3.8M	¥4,553	+96.8%	¥17.4B ($112.3M)
2025-09-04	BUY	unknown	東京海上日動火災保険株式会社 Tokio Marine & Nichido Fire Insurance Co., Ltd.	strategic	2.6M	¥4,553	+96.8%	¥11.7B ($75.6M)
2024-07-29	BUY	Market Buy	ファースト・センティア・インベスターズ(香港)リミテッドLimited) First Sentier Investors (Hong Kong	passive	135.6K	¥3,906	+129.4%	¥530M ($3.4M)
2024-07-29	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	26.3K	¥3,906	+129.4%	¥9.4B ($60.9M)
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	1.0M	¥3,906	+129.4%	¥948M ($6.1M)
2024-07-29	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.8M	¥3,906	-129.4%	¥4.0B ($25.8M)
2024-07-29	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	3.6M	¥3,906	+129.4%	¥749M ($4.8M)
2023-04-20	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	493.5K	¥2,343.33	-282.4%	¥689M ($4.4M)
2023-04-20	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	1.5M	¥2,343.33	-282.4%	¥40M ($258K)
2023-03-22	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	789.7K	¥2,506.66	-257.4%	¥1.1B ($7.3M)
2023-03-22	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	1.5M	¥2,506.66	-257.4%	¥11M ($69K)
2023-02-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.2M	¥2,153.33	+316.1%	¥37M ($237K)
2023-02-06	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	1.5M	¥2,153.33	-316.1%	¥101M ($651K)
2022-12-06	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	1.2M	¥2,256.66	+297.1%	¥250M ($1.6M)
2022-12-06	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	1.5M	¥2,256.66	+297.1%	¥48M ($310K)
2022-05-19	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	1.1M	¥2,436.66	+267.7%	¥1.1B ($6.9M)
2022-05-19	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	1.5M	¥2,436.66	+267.7%	¥10M ($67K)
2022-01-07	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	673.7K	¥2,193.33	+308.5%	¥1.5B ($9.5M)
2022-01-07	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	1.5M	¥2,193.33	+308.5%	¥3.3B ($21.5M)
2021-11-30	SELL	negotiated	エム・ユー投資顧問株式会社 M.U. Investment Advisors Co., Ltd.	unknown	0	¥2,373.33	-277.5%	¥118M ($760K)
2021-11-30	SELL	negotiated	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	48.7K	¥2,373.33	-277.5%	¥21M ($138K)
2021-11-30	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	286.0K	¥2,373.33	-277.5%	¥1.1B ($7.3M)
2021-11-30	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.0M	¥2,373.33	+277.5%	¥503M ($3.2M)
2021-11-30	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥2,373.33	+277.5%	¥2.9B ($18.5M)

Frequently asked questions

Who has been buying Tokyo Ohka Kogyo Co., Ltd. stock?: 10 distinct investors have filed 13 disclosed large-shareholding filings in Tokyo Ohka Kogyo Co., Ltd. (4186), most recently on 2026-02-05. 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 Tokyo Ohka Kogyo Co., Ltd. have?: Tokyo Ohka Kogyo Co., Ltd. has 13 buy-side and 10 sell-side disclosures on record, covering ¥17.6B ($113.9M) in total reported value, spanning 2021-11-30 to 2026-02-05.
Where does StockDrifts get Tokyo Ohka Kogyo 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 Tokyo Ohka Kogyo Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.