StockDriftsStockDriftsJapan Insulation Co., Ltd. (5368) has 11 disclosed large-shareholding filings and 20 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥962M ($6.2M) in reported transaction value. The earliest filing StockDrifts holds for Japan Insulation Co., Ltd. is dated 2021-04-07; the most recent is 2025-12-22. Across these filings the average return since disclosure is +22.54%, measured from each filing date to the latest available close.
| Date | Type | Source | Insider | Purpose | Shares | Price at filing | Return | Value |
|---|---|---|---|---|---|---|---|---|
| 2025-12-22 | SELL | Market Buy | 光通信株式会社 | passive | 359.7K | ¥1,055 | +5.4% | ¥89M ($575K) |
| 2025-12-22 | SELL | Market Buy | 株式会社UH Partners 2 | unknown | 0 | ¥1,055 | +5.4% | ¥3M ($18K) |
| 2025-11-18 | SELL | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 444.2K | ¥990 | -0.8% | ¥91M ($584K) |
| 2025-11-18 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 2.6K | ¥990 | - | - |
| 2025-10-06 | SELL | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 535.9K | ¥996 | -0.2% | ¥88M ($571K) |
| 2025-10-06 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 2.6K | ¥996 | - | - |
| 2025-08-27 | SELL | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 624.3K | ¥1,044 | +4.4% | ¥26M ($170K) |
| 2025-08-27 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 2.6K | ¥1,044 | -4.4% | ¥201M ($1.3M) |
| 2025-01-15 | BUY | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 649.5K | ¥880 | +13.4% | ¥26M ($168K) |
| 2025-01-15 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 68.4K | ¥880 | +13.4% | ¥51M ($326K) |
| 2024-07-29 | BUY | negotiated | 三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc. | strategic | 134.0K | ¥999 | - | - |
| 2024-07-29 | BUY | negotiated | 株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc. | strategic | 349.0K | ¥999 | - | - |
| 2024-07-22 | BUY | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 619.6K | ¥1,027 | -2.8% | ¥90M ($583K) |
| 2024-07-22 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 10.9K | ¥1,027 | - | - |
| 2023-12-22 | BUY | unknown | SMBC日興証券株式会社 SMBC Nikko Securities Inc. | other | 500 | ¥911 | +9.6% | ¥13M ($82K) |
| 2023-12-22 | BUY | unknown | 株式会社 三井住友銀行 Sumitomo Mitsui Banking Corporation | other | 67.0K | ¥911 | - | - |
| 2023-12-22 | SELL | unknown | 三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited | passive | 285.0K | ¥911 | -9.6% | ¥14M ($92K) |
| 2022-11-30 | BUY | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 532.2K | ¥813 | +22.8% | ¥78M ($502K) |
| 2022-11-30 | BUY | Market Buy | 株式会社UH Partners 2 UH Partners 2, Inc. | passive | 10.9K | ¥813 | - | ¥9M ($57K) |
| 2022-11-25 | SELL | unknown | 大橋 健一 Kenichi Ohashi | activist | 492.8K | ¥813 | -22.8% | ¥122M ($786K) |
| 2022-11-25 | SELL | unknown | 大橋 健一 Kenichi Ohashi | activist | 492.8K | ¥813 | -22.8% | ¥122M ($786K) |
| 2022-11-25 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 715.8K | ¥813 | -22.8% | ¥228M ($1.5M) |
| 2022-11-25 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 715.8K | ¥813 | -22.8% | ¥228M ($1.5M) |
| 2022-08-23 | BUY | unknown | 大橋 健一 Kenichi Ohashi | activist | 642.8K | ¥907 | - | - |
| 2022-08-23 | BUY | unknown | 大橋 健一 Kenichi Ohashi | activist | 642.8K | ¥907 | - | - |
| 2022-08-23 | BUY | unknown | 大橋 健一 Kenichi Ohashi | activist | 642.8K | ¥907 | - | - |
| 2022-08-23 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 1.0M | ¥907 | -10.0% | ¥118M ($759K) |
| 2022-08-23 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 995.8K | ¥907 | -10.0% | ¥135M ($871K) |
| 2022-08-23 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 995.8K | ¥907 | -10.0% | ¥135M ($871K) |
| 2022-07-19 | BUY | Market Buy | 光通信株式会社 Hikari Tsushin K.K. | passive | 436.4K | ¥874 | +14.2% | ¥381M ($2.5M) |
| 2022-05-30 | BUY | negotiated | 株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc. | strategic | 349.0K | ¥866 | - | - |
| 2022-05-30 | SELL | negotiated | 三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc. | strategic | 134.0K | ¥866 | -15.2% | ¥84M ($540K) |
| 2022-04-05 | SELL | unknown | 大橋 健一 Kenichi Ohashi | activist | 642.8K | ¥900 | -10.9% | ¥24M ($157K) |
| 2022-04-05 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 1.1M | ¥900 | -10.9% | ¥92M ($597K) |
| 2021-11-30 | BUY | negotiated | 株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc. | strategic | 349.0K | ¥991 | - | - |
| 2021-11-30 | BUY | negotiated | 三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc. | passive | 230.5K | ¥991 | +0.7% | ¥96M ($618K) |
| 2021-11-15 | SELL | unknown | 大橋 健一 Kenichi Ohashi | activist | 669.5K | ¥999 | +0.1% | ¥35M ($224K) |
| 2021-11-15 | SELL | unknown | 大橋 健一 Kenichi Ohashi | activist | 669.5K | ¥999 | +0.1% | ¥35M ($224K) |
| 2021-11-15 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 1.2M | ¥999 | +0.1% | ¥35M ($224K) |
| 2021-11-15 | SELL | unknown | 大橋 ゆふみ Yufumi Ohashi | activist | 1.2M | ¥999 | +0.1% | ¥35M ($224K) |
| 2021-05-26 | BUY | Market Buy | 大阪中小企業投資育成株式会社 Osaka Small and Medium Business Investment & Consultation Co.,Ltd | passive | 872.4K | ¥990 | - | - |
| 2021-04-07 | BUY | unknown | SMBC日興証券株式会社 SMBC Nikko Securities Inc. | other | 73.0K | ¥1,148 | -13.1% | ¥84M ($541K) |
| 2021-04-07 | BUY | unknown | 三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited | passive | 300.1K | ¥1,148 | -13.1% | ¥345M ($2.2M) |
| 2021-04-07 | BUY | unknown | 株式会社 三井住友銀行 Sumitomo Mitsui Banking Corporation | other | 67.0K | ¥1,148 | -13.1% | ¥77M ($496K) |
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.