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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 三井物産スチール | 4,927 12.31% | 4,927 12.31% | 492 13.76% | 492 13.76% | 492 13.76% | 492 13.76% | 492 13.76% | 492 13.76% | 492 13.76% | 492 13.77% |
| 住友生命保険相互会社 | 2,144 5.36% | 2,144 5.36% | 214 5.98% | 214 5.98% | 214 5.98% | 214 5.98% | 214 5.98% | 214 5.98% | 214 5.99% | 214 5.99% |
| 明治安田生命保険相互会社 | 1,831 4.57% | 1,831 4.57% | 183 5.11% | 183 5.11% | 183 5.11% | 183 5.11% | 183 5.11% | 183 5.11% | 183 5.11% | 183 5.12% |
| 日本製鉄 | 165 4.63% | 165 4.63% | 165 4.63% | 165 4.63% | 165 4.63% | 165 4.63% | ||||
| 大樹生命保険 | 165 4.61% | 165 4.61% | 165 4.61% | 165 4.61% | 165 4.61% | 165 4.61% | ||||
| みずほ銀行 | 1,707 4.26% | 1,707 4.26% | 170 4.76% | 170 4.76% | 170 4.76% | 170 4.76% | 152 4.24% | 113 3.17% | 113 3.17% | 113 3.18% |
| 日本生命保険相互会社 | 1,058 2.64% | 1,058 2.64% | 105 2.95% | 105 2.95% | 105 2.95% | 105 2.95% | 105 2.95% | 105 2.95% | 105 2.95% | 105 2.96% |
| 丸藤ビル | 1,042 2.6% | 1,042 2.6% | 104 2.91% | 104 2.91% | 104 2.91% | 104 2.91% | 104 2.91% | 104 2.91% | 104 2.91% | 104 2.91% |
| 丸藤シートパイル取引先持株会 | 64 1.8% | |||||||||
| 志村 久男 | 56 1.59% | |||||||||
| 小林 茂 | 119 3.35% | 119 3.35% | 75 2.11% | |||||||
| INTERACTIVE BROKERS LLC | 66 1.86% | |||||||||
| SBI証券 | 83 2.34% | |||||||||
| 損害保険ジャパン | 71 2% | 71 2% | ||||||||
| 三井住友信託銀行 | 674 1.68% | 674 1.68% | 67 1.88% | 67 1.88% | 67 1.88% | 67 1.88% | ||||
| 損害保険ジャパン日本興亜 | 717 1.79% | 717 1.79% | 71 2% | 71 2% | 71 2% | |||||
| 新日鐵住金 | 1,657 4.14% | 1,657 4.14% | 165 4.63% | 165 4.63% | ||||||
| 三井生命保険 | 1,651 4.12% | 1,651 4.12% | 165 4.61% | 165 4.61% | ||||||
| 計 | 17,409 43.52% | 17,409 43.52% | 1,740 48.63% | 1,740 48.63% | 1,740 48.63% | 1,740 48.63% | 1,774 49.58% | 1,748 48.85% | 1,687 47.13% | 1,665 46.55% |