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.

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.

Tigers Polymer Corporation 4231

Company

タイガースポリマー株式会社Tigers Polymer Corporation

Investors

Buys

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. 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

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-05-08	BUY	unknown	タイガー興産有限会社	strategic	2.0M	¥1,002	-	-
2026-05-08	BUY	Market Buy	澤田純治	strategic	514.0K	¥1,002	+3.7%	¥516M ($3.3M)
2024-12-11	BUY	Market Buy	タイガース取引先持株会理事長祖父江一郎 Ichiro Sofue	strategic	1.9M	¥685	+51.7%	¥164M ($1.1M)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	26.6K	¥834	-24.6%	¥65M ($422K)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	879.0K	¥834	-	-
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	16.5K	¥834	-24.6%	¥17M ($108K)
2024-07-29	BUY	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	36.5K	¥834	-	¥30M ($196K)
2023-08-07	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	879.0K	¥708	-46.8%	¥71M ($459K)
2023-08-07	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	104.7K	¥708	-46.8%	¥75M ($487K)
2023-08-07	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	36.1K	¥708	-46.8%	¥4M ($28K)
2021-11-01	BUY	unknown	タイガース取引先持株会理事長祖父江一郎 Ichiro Sofue	strategic	1.6M	¥433	-	¥88M ($567K)
2021-11-01	BUY	Market Buy	タイガース取引先持株会理事長祖父江一郎 Ichiro Sofue	strategic	1.6M	¥433	+139.9%	¥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.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.