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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 茂森 潔 | 762 6.58% | 762 6.58% | 76 7.74% | 76 7.74% | 76 7.51% | 381 7.69% | 381 7.69% | 762 7.58% | 762 7.58% | 762 7.58% |
| 麻生 | 235 2.02% | 235 2.02% | 23 2.38% | 23 2.38% | 23 2.31% | 117 2.37% | 335 6.77% | 687 6.84% | 687 6.84% | 687 6.84% |
| 茂森 拓 | 411 3.54% | 411 3.54% | 41 4.17% | 41 4.17% | 41 4.05% | 205 4.15% | 205 4.15% | 411 4.09% | 411 4.09% | 411 4.09% |
| 伊藤忠丸紅住商テクノスチール | 230 1.98% | 23 2.33% | 40 4.06% | 40 3.94% | 200 4.04% | 200 4.04% | 400 3.98% | 400 3.98% | 400 3.98% | |
| UBE三菱セメント | 370 3.68% | 370 3.68% | 370 3.68% | |||||||
| 日本カストディ銀行 | 150 3.03% | 145 2.94% | 414 4.12% | 214 2.13% | 354 3.52% | |||||
| 南日本銀行 | 240 2.07% | 240 2.07% | 24 2.43% | 24 2.43% | 24 2.36% | 120 2.42% | 120 2.42% | 240 2.38% | 240 2.38% | 240 2.38% |
| 江田 幸雄 | 230 2.29% | |||||||||
| 共和コンクリート工業 | 220 1.89% | 22 2.23% | 22 2.23% | 220 2.18% | 220 2.18% | |||||
| ヤマックス従業員持株会 | 270 2.33% | 267 2.31% | 26 2.69% | 25 2.62% | 25 2.47% | 135 2.74% | 130 2.63% | 279 2.78% | 245 2.43% | 203 2.02% |
| 平松裕将 | 37 3.81% | 57 5.7% | 342 6.91% | 376 7.59% | 752 7.48% | |||||
| 元村寿吉 | 115 2.33% | 111 2.24% | 237 2.35% | |||||||
| 宇部三菱セメント | 365 3.15% | 365 3.15% | 36 3.71% | 36 3.71% | 36 3.6% | 182 3.68% | 182 3.68% | |||
| 資産管理サービス信託銀行 | 241 2.08% | 30 2.95% | ||||||||
| みずほ銀行 | 240 2.07% | 240 2.07% | 24 2.43% | 24 2.43% | 24 2.36% | |||||
| SBI証券 | 327 2.82% | 223 1.92% | 45 4.65% | |||||||
| 日本トラスティ・サービス信託銀行 | 334 2.88% | |||||||||
| 計 | 3,425 29.58% | 3,193 27.58% | 342 34.82% | 350 35.64% | 378 37.3% | 1,950 39.4% | 2,187 44.2% | 4,553 45.32% | 3,964 39.45% | 3,877 38.59% |