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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 太田 明弘 | 1,444.4 24.58% | 1,443.3 24.56% | 1,453 26.29% | 1,449.1 26.22% | 1,423.6 25.63% | 1,423 25.63% | 1,471.2 26.5% | 1,471.2 26.51% | 1,471.2 26.51% | 1,471.2 26.51% |
| オーシャス | 330 5.94% | 330 5.94% | 330 5.94% | 1,176 21.19% | ||||||
| 学校法人高宮学園 | 127 2.16% | 127 2.16% | 127 2.29% | 127 2.29% | 127 2.28% | 277 4.98% | 277 4.99% | 277 4.99% | 277 4.99% | 277 4.99% |
| くふうカンパニー | 107.4 1.93% | 249.9 4.5% | ||||||||
| 成学社従業員持株会 | 346.6 5.89% | 341.6 5.81% | 272.7 4.93% | 269.6 4.87% | 243.4 4.38% | 221.6 3.99% | 228.5 4.11% | 239.6 4.31% | 242.6 4.37% | 247.1 4.45% |
| 太田 貴美子 | 174 2.96% | 174 2.96% | 174 3.14% | 174 3.14% | 174 3.13% | 174 3.13% | 174 3.13% | 174 3.13% | 174 3.13% | 174 3.13% |
| さなる | 159 2.7% | 159 2.7% | 159 2.87% | 159 2.87% | 159 2.86% | 159 2.86% | 159 2.86% | 159 2.86% | 159 2.86% | 159 2.86% |
| 仙台進学プラザ | 59.2 1.07% | 59.2 1.06% | 59.2 1.06% | 59.2 1.06% | 74.2 1.33% | 84.2 1.51% | 114.3 2.06% | |||
| 永井 博 | 85.437 1.45% | 86.169 1.46% | 86.839 1.57% | 87.445 1.58% | 88.113 1.58% | 88.847 1.6% | 90.346 1.62% | 93.339 1.68% | 96.656 1.74% | 100.241 1.8% |
| 日本作文指導協会 | 58.6 0.99% | 58.6 0.99% | 58.6 1.06% | 58.6 1.06% | 58.6 1.05% | 58.6 1.05% | 58.6 1.05% | |||
| ニューウェーブ | 1,176 20.01% | 1,176 20.01% | 1,176 21.28% | 1,176 21.28% | 1,176 21.17% | 1,176 21.18% | 846 15.24% | 846 15.24% | 846 15.24% | |
| ナガセ | 400 6.8% | 400 6.8% | 400 7.23% | 400 7.23% | 400 7.2% | 250 4.5% | 144 2.59% | 144 2.59% | ||
| MM印刷 | 57 1.03% | |||||||||
| 平野 秀一 | 83.2 1.41% | 59.9 1.01% | ||||||||
| 計 | 4,054.237 68.99% | 4,025.569 68.5% | 3,964.139 71.74% | 3,959.945 71.66% | 3,908.913 70.38% | 3,887.247 70.02% | 3,779.246 68.09% | 3,808.339 68.64% | 3,788.056 68.27% | 4,027.341 72.59% |