大株主
| （単位：千株） | 2015/12 | 2016/12 | 2017/12 | 2018/12 | 2019/12 | 2020/12 | 2021/12 | 2022/12 | 2023/12 | 2024/12 |
|---|---|---|---|---|---|---|---|---|---|---|
| 日本マスタートラスト信託銀行 | 386 2.7% | 494 3.5% | 568 4% | 1,223 8.7% | 1,619 11.5% | 1,508 10.7% | 1,423 10.27% | 1,501 10.8% | ||
| 光パワー | 279 2% | 612 4.3% | 1,154 8.2% | 1,361 9.6% | 1,396 10.07% | 1,396 10.1% | ||||
| 建設技術研究所従業員持株会 | 1,359 9.6% | 1,375 9.7% | 1,331 9.4% | 1,231 8.7% | 1,228 8.7% | 1,195 8.5% | 1,084 7.7% | 1,123 7.9% | 1,075 7.76% | 1,068 7.7% |
| 重田康光 | 396 2.8% | 396 2.8% | 396 2.8% | 396 2.8% | 396 2.8% | 396 2.86% | 396 2.9% | |||
| 三菱UFJ銀行 | 371 2.6% | 371 2.6% | 371 2.6% | 371 2.6% | 371 2.6% | 371 2.68% | 371 2.7% | |||
| 日本カストディ銀行 | 524 3.7% | 445 3.2% | 495 3.5% | 477 3.44% | 368 2.7% | |||||
| 三菱UFJ信託銀行 | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.5% | 354 2.56% | 354 2.6% |
| 住友生命保険相互会社 | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.1% | 300 2.17% | 300 2.2% |
| 第一生命保険 | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.9% | 269 1.94% | 269 1.9% |
| 高橋 豊 | 275 1.98% | 235 1.7% | ||||||||
| DFA INTL SMALL CAP VALUE PORTFOLIO | 351 2.5% | 344 2.4% | 328 2.3% | 218 1.5% | 210 1.5% | 210 1.5% | ||||
| 日本トラスティ・サービス信託銀行 | 229 1.6% | 346 2.4% | 251 1.8% | 358 2.5% | 436 3.1% | |||||
| BNY GCM CLIENT ACCOUNT JPRD AC ISG | 550 3.9% | |||||||||
| 三菱東京UFJ銀行 | 371 2.6% | 371 2.6% | 371 2.6% | |||||||
| THE BANK OF NEW YORK, NON-TREATY JASDEC ACCOUNT | 195 1.4% | |||||||||
| CBNY DFA INTL SMALL CAP VALUE PORTFOLIO | 347 2.5% | 345 2.4% | ||||||||
| 日本マスタートラスト信託銀行株式会社日本生命保険相互会社 | 221 1.6% | 288 2% | ||||||||
| 日本生命保険相互会社 | 188 1.3% | 188 1.3% | ||||||||
| 大同生命保険 | 174 1.2% | |||||||||
| 計 | 4,090 28.9% | 4,014 28.4% | 4,166 29.4% | 4,672 33% | 4,533 32% | 5,467 38.7% | 6,207 43.9% | 6,391 45.2% | 6,340 45.73% | 6,262 45.1% |