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Tigers Polymer Corporation 4231

Company
タイガースポリマー株式会社Tigers Polymer Corporation
Investors
7
Buys
3
Total Value
¥680M ($4.4M)
Avg Return
+59.05%
Last Filing
2026-05-08

Tigers Polymer Corporation (4231) has 3 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥680M ($4.4M) in reported transaction value. The earliest filing StockDrifts holds for Tigers Polymer Corporation is dated 2021-11-01; the most recent is 2026-05-08. 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 +59.05%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-05-08BUYMarket Buy
澤田 純治
strategic514.0K¥1,002-4.7%¥516M ($3.3M)
2026-05-08BUYunknown
タイガー興産有限会社
strategic2.0M¥1,002-4.7%¥2.0B ($12.7M)
2024-12-11BUYMarket Buy
タイガース取引先持株会 理事長 祖父江 一郎
Ichiro Sofue
strategic1.9M¥685+48.5%¥164M ($1.1M)
2024-07-29BUYnegotiated
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.
other36.5K¥834+21.9%¥30M ($196K)
2024-07-29SELLnegotiated
三菱UFJアセットマネジメント株式会社
Mitsubishi UFJ Financial Group Inc.
passive16.5K¥834-21.9%¥17M ($108K)
2024-07-29SELLnegotiated
三菱UFJ信託銀行株式会社
Mitsubishi UFJ Financial Group Inc.
passive26.6K¥834-21.9%¥65M ($422K)
2024-07-29BUYnegotiated
株式会社三菱UFJ銀行
Mitsubishi UFJ Financial Group Inc.
strategic879.0K¥834+21.9%¥733M ($4.7M)
2023-08-07SELLnegotiated
三菱UFJ国際投信株式会社
Mitsubishi UFJ Financial Group Inc.
passive36.1K¥708-43.6%¥4M ($28K)
2023-08-07SELLnegotiated
三菱UFJ信託銀行株式会社
Mitsubishi UFJ Financial Group Inc.
passive104.7K¥708-43.6%¥75M ($487K)
2023-08-07SELLnegotiated
株式会社三菱UFJ銀行
Mitsubishi UFJ Financial Group Inc.
strategic879.0K¥708-43.6%¥71M ($459K)
2021-11-01BUYMarket Buy
タイガース取引先持株会 理事長 祖父江一郎
Ichiro Sofue
strategic1.6M¥433+134.9%¥88M ($567K)
2021-11-01BUYunknown
タイガース取引先持株会 理事長 祖父江一郎
Ichiro Sofue
strategic1.6M¥433+134.9%¥88M ($567K)

Frequently asked questions

Who has been buying Tigers Polymer Corporation stock?
7 distinct investors have filed 3 disclosed large-shareholding filings in Tigers Polymer Corporation (4231), most recently on 2026-05-08. 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 Tigers Polymer Corporation have?
Tigers Polymer Corporation has 3 buy-side and 5 sell-side disclosures on record, covering ¥680M ($4.4M) in total reported value, spanning 2021-11-01 to 2026-05-08.
Where does StockDrifts get Tigers Polymer 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 Tigers Polymer Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.