StockDriftsStockDriftsKaizen Platform, Inc. (4170) has 31 disclosed large-shareholding filings and 23 disclosed disposals on record, filed by 14 distinct investors. Together those filings cover ¥5.5B ($35.6M) in reported transaction value. The earliest filing StockDrifts holds for Kaizen Platform, Inc. is dated 2021-04-07; the most recent is 2026-05-12. Across these filings the average return since disclosure is -44.95%, measured from each filing date to the latest available close.
| Date | Type | Source | Insider | Purpose | Shares | Price at filing | Return | Value |
|---|---|---|---|---|---|---|---|---|
| 2026-09-07 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 700.8K | ¥129 | +13.2% | ¥127M ($818K) |
| 2026-09-01 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.7M | ¥138 | +18.8% | ¥29M ($186K) |
| 2026-08-28 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.1M | ¥141 | - | ¥72M ($464K) |
| 2026-08-28 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 495.6K | ¥141 | - | ¥88M ($566K) |
| 2026-08-28 | SELL | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.1M | ¥141 | +20.6% | ¥72M ($464K) |
| 2026-08-28 | SELL | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 495.6K | ¥141 | +20.6% | ¥88M ($566K) |
| 2026-07-23 | SELL | unknown | 楽天証券株式会社 Rakuten Securities Inc | other | 509.8K | ¥118 | +5.1% | ¥49M ($314K) |
| 2026-07-07 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.9M | ¥112 | +0.0% | ¥56M ($362K) |
| 2026-07-02 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 2.4M | ¥110 | +1.8% | ¥59M ($382K) |
| 2026-06-25 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.9M | ¥102 | +9.8% | ¥3M ($22K) |
| 2026-06-23 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.6M | ¥101 | +10.9% | ¥19M ($121K) |
| 2026-06-19 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.8M | ¥100 | -12.0% | ¥171K ($1K) |
| 2026-06-18 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.8M | ¥104 | +7.7% | ¥25M ($162K) |
| 2026-06-03 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.4M | ¥135 | -17.0% | ¥25M ($159K) |
| 2026-05-12 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.6M | ¥165 | -32.1% | ¥13M ($83K) |
| 2026-04-21 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.5M | ¥175 | -36.0% | ¥21M ($136K) |
| 2026-03-23 | BUY | Market Buy | 楽天証券株式会社 Rakuten Securities Inc | other | 916.4K | ¥155 | -27.7% | ¥5M ($31K) |
| 2026-02-25 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.3M | ¥170 | -34.1% | ¥37M ($239K) |
| 2026-02-25 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.3M | ¥170 | - | ¥37M ($239K) |
| 2026-02-16 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.2M | ¥170 | -34.1% | ¥27M ($175K) |
| 2026-02-16 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.2M | ¥170 | - | ¥27M ($175K) |
| 2026-02-06 | SELL | unknown | 楽天証券株式会社 Rakuten Securities Inc | other | 887.4K | ¥195 | +42.6% | ¥34M ($221K) |
| 2026-01-13 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.4M | ¥182 | +38.5% | ¥89M ($571K) |
| 2026-01-07 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.9M | ¥176 | -36.4% | ¥125M ($804K) |
| 2025-12-03 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.0M | ¥182 | - | ¥33M ($216K) |
| 2025-12-03 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 1.0M | ¥182 | -38.5% | ¥33M ($216K) |
| 2025-08-22 | BUY | Market Buy | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.2M | ¥230 | -51.3% | ¥46M ($295K) |
| 2025-08-12 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 850.7K | ¥211 | - | ¥179M ($1.2M) |
| 2025-08-12 | BUY | Market Buy | 黒田 直樹 Naoki Kuroda | passive | 850.7K | ¥211 | -46.9% | ¥179M ($1.2M) |
| 2025-07-22 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 951.8K | ¥209 | +46.4% | ¥80M ($516K) |
| 2025-07-04 | BUY | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.3M | ¥189 | -40.7% | ¥252M ($1.6M) |
| 2025-01-21 | SELL | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 771.0K | ¥171 | +34.5% | ¥50M ($324K) |
| 2025-01-09 | BUY | unknown | 株式会社SBI証券 SBI SECURITIES Co.,Ltd. | other | 1.1M | ¥172 | -34.9% | ¥183M ($1.2M) |
| 2024-12-18 | BUY | Market Buy | 楽天証券株式会社 Rakuten Securities Inc | other | 1.1M | ¥167 | -32.9% | ¥29M ($188K) |
| 2024-08-21 | BUY | unknown | 楽天証券株式会社 Rakuten Securities Inc | other | 882.4K | ¥206 | -45.6% | ¥182M ($1.2M) |
| 2024-07-16 | BUY | negotiated | 株式会社エヌ・ティ・ティ・アド NTT ADVERTISING,INC. | strategic | 711.7K | ¥240 | - | ¥86M ($554K) |
| 2024-07-16 | SELL | negotiated | 株式会社エヌ・ティ・ティ・アド NTT ADVERTISING,INC. | strategic | 711.7K | ¥240 | +53.3% | ¥86M ($554K) |
| 2023-07-19 | SELL | Market Buy | クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP | passive | 815.0K | ¥346 | +67.6% | ¥71M ($458K) |
| 2023-06-22 | SELL | Market Buy | クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP | passive | 1.0M | ¥333 | +66.4% | ¥74M ($477K) |
| 2023-06-15 | SELL | Market Buy | クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP | passive | 1.2M | ¥326 | +65.6% | ¥59M ($379K) |
| 2023-06-08 | SELL | Market Buy | クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP | passive | 1.4M | ¥337 | +66.8% | ¥74M ($476K) |
| 2023-04-17 | SELL | Market Buy | クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP | passive | 1.6M | ¥381 | +70.6% | ¥64M ($413K) |
| 2022-07-25 | BUY | unknown | アセットマネジメントOne株式会社 Asset Management One Co., Ltd. | other | 781.8K | ¥409 | -72.6% | ¥316M ($2.0M) |
| 2022-07-25 | SELL | unknown | みずほ証券 株式会社 Mizuho Securities Co., Ltd. | other | 33.7K | ¥409 | +72.6% | ¥682K ($4K) |
| 2022-07-07 | BUY | unknown | アセットマネジメントOne株式会社 Asset Management One Co., Ltd. | other | 972.3K | ¥407 | -72.5% | ¥391M ($2.5M) |
| 2022-07-07 | SELL | unknown | みずほ証券 株式会社 Mizuho Securities Co., Ltd. | other | 34.8K | ¥407 | +72.5% | ¥3M ($22K) |
| 2022-04-22 | BUY | Market Buy | アセットマネジメントOne株式会社 Asset Management One Co., Ltd. | other | 1.2M | ¥500 | -77.6% | ¥90M ($578K) |
| 2022-04-22 | SELL | Market Buy | みずほ証券 株式会社 Mizuho Securities Co., Ltd. | other | 43.5K | ¥500 | +77.6% | ¥5M ($32K) |
| 2022-03-28 | SELL | unknown | 石橋 利真 Ishibashi Toshimasa | strategic | 782.5K | ¥390 | +71.3% | ¥69M ($447K) |
| 2022-03-08 | BUY | unknown | 石橋 利真 Ishibashi Toshimasa | strategic | 959.7K | ¥337 | - | ¥60M ($390K) |
Showing the 50 most recent of 80 filings.
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.