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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 積水樹脂 | 3,450 22.52% | 3,450 22.52% | 690 23.82% | 690 23.82% | 690 23.83% | 690 23.83% | 690 23.83% | 690 23.83% | 690 23.83% | 690 23.76% |
| ニッコー共栄会 | 1,525 9.96% | 1,596 10.42% | 302 10.44% | 310 10.71% | 331 11.46% | 302 10.45% | 301 10.39% | 300 10.38% | 305 10.56% | 306 10.55% |
| ニッコー持株会 | 674 4.4% | 698 4.56% | 130 4.49% | 136 4.72% | 137 4.76% | 146 5.05% | 157 5.44% | 169 5.86% | 147 5.09% | 139 4.8% |
| UBE三菱セメント | 111 3.84% | 111 3.84% | 111 3.83% | |||||||
| 伊予銀行 株式会社日本カストディ銀行 | 78 2.7% | 78 2.7% | 78 2.7% | 78 2.7% | 78 2.7% | |||||
| アサノ産業 | 361 2.36% | 361 2.36% | 72 2.5% | 72 2.5% | 72 2.5% | 72 2.5% | 72 2.5% | 72 2.5% | 72 2.5% | 72 2.49% |
| 中 山 盛 雄 | 336 2.19% | 336 2.19% | 67 2.32% | 67 2.32% | 67 2.32% | 67 2.32% | 67 2.32% | 67 2.32% | 67 2.32% | 67 2.32% |
| 香川銀行 | 262 1.71% | 262 1.71% | 52 1.81% | 52 1.81% | 52 1.81% | 52 1.81% | 52 1.81% | 52 1.81% | 52 1.81% | 52 1.81% |
| 商工組合中央金庫 | 216 1.41% | 216 1.41% | 43 1.5% | 43 1.5% | 43 1.5% | 43 1.5% | 43 1.5% | 43 1.5% | 43 1.5% | 43 1.49% |
| 住友生命保険相互会社 株式会社日本カストディ銀行 | 41 1.42% | 41 1.42% | 41 1.42% | 41 1.42% | 41 1.41% | |||||
| 宇部興産 | 556 3.63% | 556 3.63% | 111 3.84% | 111 3.84% | 111 3.84% | 111 3.84% | 111 3.84% | |||
| 伊予銀行 資産管理サービス信託銀行 | 391 2.56% | 391 2.56% | 78 2.7% | 78 2.7% | 78 2.7% | |||||
| クレディ・スイス証券 | 52 1.81% | |||||||||
| 住友生命保険相互会社 日本トラスティ・サービス信託銀行 | 205 1.34% | 205 1.34% | 41 1.42% | 41 1.42% | ||||||
| 計 | 7,980 52.09% | 8,075 52.71% | 1,588 54.84% | 1,602 55.34% | 1,636 56.52% | 1,605 55.42% | 1,614 55.75% | 1,626 56.16% | 1,609 55.58% | 1,601 55.16% |