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Chemipro Kasei Kaisha, Ltd. 4960

Company
ケミプロ化成株式会社Chemipro Kasei Kaisha, Ltd.
Investors
3
Buys
9
Total Value
¥1.5B ($9.5M)
Avg Return
+152.67%
Last Filing
2026-02-09

Chemipro Kasei Kaisha, Ltd. (4960) has 9 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥1.5B ($9.5M) in reported transaction value. The earliest filing StockDrifts holds for Chemipro Kasei Kaisha, Ltd. is dated 2022-04-26; the most recent is 2026-02-09. 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 +152.67%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-07-21BUYblock_purchase
福岡 靖介
SEISUKE FUKUOKA
other1.7M¥507+5.5%¥84M ($544K)
2026-05-29BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.4M¥616-7.6%¥103M ($667K)
2026-02-09SELLunknown
福岡 靖介
SEISUKE FUKUOKA
other1.2M¥934+15.2%¥171M ($1.1M)
2026-02-09BUYunknown
福岡 靖介
SEISUKE FUKUOKA
other1.2M¥934-15.2%¥172M ($1.1M)
2026-02-05SELLunknown
福岡　靖介
SEISUKE FUKUOKA
other1.4M¥922+14.1%¥285M ($1.8M)
2024-07-03BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.7M¥390+103.1%¥65M ($422K)
2024-07-03BUYunknown
福岡 靖介
SEISUKE FUKUOKA
other1.7M¥390+103.1%¥65M ($422K)
2024-04-26BUYunknown
株式会社ケアシステムズ
CARE SYSTEMS INC.
activist3.5M¥394+101.0%¥1.4B ($8.8M)
2024-04-26BUYunknown
株式会社ケアシステムズ 代表取締役 小林秀樹
CARE SYSTEMS INC.
activist3.5M¥394+101.0%¥1.4B ($8.8M)
2024-01-26BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.5M¥364+117.6%¥61M ($390K)
2023-12-22BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.4M¥320+147.5%¥53M ($343K)
2023-08-17BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.2M¥271+192.3%¥49M ($317K)
2023-02-28BUYMarket Buy
福岡 靖介
SEISUKE FUKUOKA
other1.0M¥300+164.0%¥54M ($351K)
2023-02-28BUYunknown
福岡 靖介
SEISUKE FUKUOKA
other1.0M¥300+164.0%¥54M ($351K)
2023-02-09BUYunknown
福岡 靖介
SEISUKE FUKUOKA
other844.7K¥294+169.4%¥248M ($1.6M)
2022-11-24BUYMarket Buy
福岡靖介
SEISUKE FUKUOKA
other178.2K¥277+185.9%¥49M ($318K)
2022-04-26BUYMarket Buy
ケミプロ化成取引先持株会 理事長 竹内 真一
takeuti siniti
other999.5K¥270+193.3%¥45M ($292K)

Frequently asked questions

Who has been buying Chemipro Kasei Kaisha, Ltd. stock?
3 distinct investors have filed 9 disclosed large-shareholding filings in Chemipro Kasei Kaisha, Ltd. (4960), most recently on 2026-02-09. 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 Chemipro Kasei Kaisha, Ltd. have?
Chemipro Kasei Kaisha, Ltd. has 9 buy-side and 2 sell-side disclosures on record, covering ¥1.5B ($9.5M) in total reported value, spanning 2022-04-26 to 2026-02-09.
Where does StockDrifts get Chemipro Kasei Kaisha, 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 Chemipro Kasei Kaisha, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.