大株主
| （単位：千株） | 2016/03 | 2017/03 | 2018/03 | 2019/03 | 2020/03 | 2021/03 | 2022/03 | 2023/03 | 2024/03 | 2025/03 |
|---|---|---|---|---|---|---|---|---|---|---|
| 昭和化学工業 | 2,357 15.24% | 2,357 15.24% | 471 15.3% | 471 15.3% | 471 15.3% | 471 15.3% | 471 15.3% | 471 15.3% | 471 15.3% | 471 15.43% |
| 麻生 | 1,647 10.65% | 2,110 13.64% | 442 14.36% | 445 14.46% | 445 14.47% | 445 14.46% | 445 14.46% | 445 14.46% | 445 14.46% | 445 14.58% |
| 若築建設 | 2,116 13.68% | 2,116 13.68% | 423 13.74% | 423 13.74% | 423 13.74% | 423 13.74% | 423 13.74% | 423 13.74% | 423 13.74% | 423 13.85% |
| 日本カストディ銀行 | 316 10.28% | 312 10.14% | 303 9.84% | 294 9.56% | 304 9.96% | |||||
| オーベクス取引先持株会 | 651 4.21% | 428 2.76% | 86 2.82% | 83 2.7% | 91 2.96% | 101 3.28% | 103 3.34% | 104 3.38% | 109 3.54% | 115 3.76% |
| 栗原 則義 | 37 1.23% | 45 1.47% | 57 1.87% | 80 2.63% | ||||||
| 大塩 学而 | 72 2.38% | |||||||||
| 青木 勇 | 56 1.84% | |||||||||
| オーベクス従業員持株会 | 238 1.54% | 245 1.58% | 50 1.65% | 46 1.51% | 52 1.7% | 56 1.82% | 56 1.84% | 58 1.9% | 58 1.88% | 55 1.82% |
| 木内 忠興 | 46 1.51% | |||||||||
| みずほ銀行 | 677 4.37% | 677 4.37% | 135 4.4% | 135 4.4% | 135 4.4% | 113 3.68% | 95 3.09% | 95 3.09% | 95 3.09% | |
| 大田 昭彦 | 55 1.78% | 75 2.43% | ||||||||
| 三井住友信託銀行 | 333 2.15% | 333 2.15% | 66 2.16% | 66 2.16% | 66 2.16% | 66 2.16% | 66 2.16% | 62 2.03% | 56 1.83% | |
| アルビノ | 43 1.42% | 64 2.09% | ||||||||
| 井上 幸雄 | 204 1.31% | 40 1.32% | 40 1.32% | 40 1.32% | 40 1.32% | |||||
| 資産管理サービス信託銀行 | 1,307 8.45% | 1,633 10.56% | 324 10.53% | 317 10.32% | 316 10.28% | |||||
| 石橋産業 | 403 2.61% | 303 1.95% | 49 1.61% | 41 1.35% | 37 1.21% | |||||
| オーベクス | 386 2.5% | |||||||||
| 計 | 10,117 65.42% | 10,407 67.3% | 2,091 67.88% | 2,072 67.26% | 2,080 67.55% | 2,073 67.3% | 2,063 67% | 2,083 67.65% | 2,086 67.75% | 2,071 67.82% |