StockDriftsStockDriftsKoyosha Inc. (7946) has 22 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 17 distinct investors. Together those filings cover ¥198M ($1.3M) in reported transaction value. The earliest filing StockDrifts holds for Koyosha Inc. is dated 2021-03-22; the most recent is 2025-04-18. Across these filings the average return since disclosure is +31.12%, measured from each filing date to the latest available close.
| Date | Type | Source | Insider | Purpose | Shares | Price at filing | Return | Value |
|---|---|---|---|---|---|---|---|---|
| 2025-04-18 | BUY | unknown | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥272 | +34.9% | ¥6M ($38K) |
| 2025-04-18 | BUY | Market Buy | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥272 | +34.9% | ¥6M ($38K) |
| 2025-04-18 | BUY | Market Buy | 株式会社KK KK Co., Ltd. | activist | 50.0K | ¥272 | +34.9% | ¥2M ($13K) |
| 2025-04-18 | BUY | unknown | 株式会社KK KK Co., Ltd. | activist | 50.0K | ¥272 | +34.9% | ¥2M ($13K) |
| 2025-03-28 | BUY | unknown | 学校法人日吉台学園 HIYOSHIDAIGAKUEN | other | 0 | ¥293.6 | - | ¥42M ($271K) |
| 2025-03-28 | BUY | unknown | 学校法人日吉台学園 Hiyoshidaigakuen | other | 150.0K | ¥293.6 | - | - |
| 2025-03-28 | SELL | unknown | 学校法人日吉台学園 HIYOSHIDAIGAKUEN | other | 0 | ¥293.6 | -25.0% | - |
| 2025-03-28 | BUY | unknown | 学校法人日吉台学園 Hiyoshidaigakuen | other | 150.0K | ¥293.6 | - | - |
| 2025-03-03 | BUY | Market Buy | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥296 | +24.0% | ¥12M ($79K) |
| 2025-03-03 | BUY | Market Buy | 株式会社KK KK Co., Ltd. | activist | 50.0K | ¥296 | - | ¥15M ($95K) |
| 2022-04-25 | BUY | unknown | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥232.6 | - | - |
| 2022-04-11 | BUY | unknown | 植島 幹九郎 Kankuro Ueshima | unknown | 0 | ¥249.2 | - | ¥106M ($686K) |
| 2022-04-11 | SELL | unknown | 植島 幹九郎 Kankuro Ueshima | unknown | 0 | ¥249.2 | -47.3% | ¥106M ($686K) |
| 2022-03-11 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 426.9K | ¥238.6 | - | - |
| 2021-12-13 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 426.9K | ¥294.4 | +24.7% | ¥4M ($23K) |
| 2021-10-20 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 414.6K | ¥524 | -30.0% | ¥13M ($86K) |
| 2021-10-07 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 389.1K | ¥338 | - | ¥10M ($64K) |
| 2021-10-07 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 389.1K | ¥338 | +8.6% | ¥10M ($64K) |
| 2021-09-16 | BUY | unknown | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥303.6 | - | - |
| 2021-09-16 | BUY | unknown | 学校法人日吉台学園 HIYOSHIDAIGAKUEN | other | 200.0K | ¥303.6 | - | - |
| 2021-09-16 | BUY | unknown | サカタインクス株式会社 Sakata INX Corporation | strategic | 6.6K | ¥303.6 | - | ¥2M ($13K) |
| 2021-09-16 | BUY | unknown | 片山英彦 Hidehiko Katayama | strategic | 15.5K | ¥303.6 | - | ¥5M ($30K) |
| 2021-09-16 | BUY | unknown | 株式会社研文社 Kenbunsha Co., Ltd. | strategic | 8.9K | ¥303.6 | - | ¥3M ($17K) |
| 2021-09-16 | BUY | unknown | 株式会社尾上紙店 Onoe Paper Co., Ltd. | strategic | 8.7K | ¥303.6 | - | ¥3M ($17K) |
| 2021-09-16 | BUY | unknown | 木曽 茂樹 Shigeki Kiso | strategic | 1.0K | ¥303.6 | - | ¥304K ($2K) |
| 2021-09-16 | BUY | unknown | 冨 正俊 Masatoshi Tomi | activist | 6.8K | ¥303.6 | - | ¥2M ($13K) |
| 2021-09-16 | BUY | unknown | 住井 秀行 Hideyuki Sumii | strategic | 1.1K | ¥303.6 | - | ¥334K ($2K) |
| 2021-09-16 | BUY | unknown | 新日本カレンダー株式会社 New Japan Calendar Co., Ltd. | strategic | 50.0K | ¥303.6 | - | ¥15M ($98K) |
| 2021-09-16 | BUY | unknown | 株式会社石川商会 Ishikawa Shokai Co., Ltd. | strategic | 17.5K | ¥303.6 | - | ¥5M ($34K) |
| 2021-09-16 | BUY | unknown | 株式会社片山 Katayama Co., Ltd. | strategic | 61.4K | ¥303.6 | - | ¥19M ($120K) |
| 2021-09-16 | BUY | unknown | 千葉 達也 Tatsuya Chiba | strategic | 2.5K | ¥303.6 | - | ¥759K ($5K) |
| 2021-09-03 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 359.5K | ¥310.2 | +18.3% | ¥3M ($18K) |
| 2021-07-01 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 350.4K | ¥279.8 | +31.2% | ¥7M ($44K) |
| 2021-06-24 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 325.8K | ¥317 | +15.8% | ¥6M ($37K) |
| 2021-06-22 | BUY | unknown | 犬養 岬太 KOTA INUKAI | activist | 144.7K | ¥268 | +36.9% | ¥39M ($250K) |
| 2021-06-22 | SELL | Market Buy | 水口 翼 Tsubasa Mizuguchi | activist | 0 | ¥268 | -36.9% | ¥19M ($121K) |
| 2021-06-22 | SELL | Market Buy | サイブリッジ合同会社 CYBRiDGE LLC | activist | 0 | ¥268 | -36.9% | ¥26M ($169K) |
| 2021-05-10 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 307.9K | ¥224 | +63.8% | ¥4M ($28K) |
| 2021-04-27 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 288.9K | ¥236.4 | +55.3% | ¥5M ($35K) |
| 2021-04-26 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 266.2K | ¥220.4 | +66.5% | ¥16M ($102K) |
| 2021-04-23 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 194.8K | ¥219.8 | +67.0% | ¥8M ($55K) |
| 2021-04-22 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 156.2K | ¥219.2 | - | ¥4M ($28K) |
| 2021-04-22 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 156.2K | ¥219.2 | +67.4% | ¥4M ($28K) |
| 2021-04-20 | BUY | Market Buy | 植島 幹九郎 Kankuro Ueshima | activist | 136.4K | ¥231 | +58.9% | ¥32M ($203K) |
| 2021-04-19 | BUY | Market Buy | サイブリッジ合同会社 CYBRiDGE LLC | activist | 1.0K | ¥216.4 | - | ¥216K ($1K) |
| 2021-04-19 | BUY | Market Buy | 水口 翼 Tsubasa Mizuguchi | activist | 70.1K | ¥216.4 | - | ¥15M ($98K) |
| 2021-03-22 | BUY | Market Buy | サイブリッジ合同会社 CYBRiDGE LLC | activist | 1.0K | ¥959.057 | -61.7% | ¥959K ($6K) |
| 2021-03-22 | BUY | Market Buy | サイブリッジ合同会社 CYBRiDGE LLC | activist | 1.0K | ¥959.057 | -61.7% | ¥959K ($6K) |
| 2021-03-22 | BUY | Market Buy | 水口 翼 Tsubasa Mizuguchi | activist | 71.1K | ¥959.057 | -61.7% | ¥68M ($440K) |
| 2021-03-22 | BUY | Market Buy | 水口 翼 Tsubasa Mizuguchi | activist | 70.1K | ¥959.057 | -61.7% | ¥67M ($434K) |
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.