| 2026 |
| 06/03 | 4,475 | 4,480 | 4,475 | 4,475 | 0% | 6,000 | 337億8625万 | +34.75% |
| 06/02 | 4,475 | 4,475 | 4,475 | 4,475 | 0% | 4,700 | 337億8625万 | +38.42% |
| 06/01 | 4,475 | 4,480 | 4,475 | 4,475 | 0% | 8,200 | 337億8625万 | +42.29% |
| 05/29 | 4,475 | 4,480 | 4,475 | 4,475 | 0% | 16,700 | 337億8625万 | +46.43% |
| 05/28 | 4,475 | 4,480 | 4,475 | 4,475 | 0% | 8,100 | 337億8625万 | +50.88% |
| 05/27 | 4,475 | 4,475 | 4,475 | 4,475 | 0% | 1,900 | 337億8625万 | +55.54% |
| 05/26 | 4,475 | 4,480 | 4,475 | 4,475 | -0.11% | 10,900 | 337億8625万 | +60.57% |
| 05/25 | 4,475 | 4,480 | 4,475 | 4,480 | 0% | 34,800 | 338億2400万 | +66.17% |
| 05/22 | (5%ルール)エスアイエル(1.59%)光通信(7.46%)東京窯業(8.36%)UH Partners 2(6.28%)岡谷鋼機(9.96%)UH Partners 3(6.31%)大同特殊鋼(33.77%) |
| 05/22 | (5%ルール)UH Partners 3(6.31%)大同特殊鋼(33.77%)UH Partners 2(6.28%)エスアイエル(1.59%)光通信(7.46%) |
| 05/22 | (5%ルール)光通信(7.46%)岡谷鋼機(9.96%)東京窯業(8.36%)UH Partners 2(6.28%)大同特殊鋼(33.77%)エスアイエル(1.59%)UH Partners 3(6.31%) |
| 05/22 | 4,475 | 4,480 | 4,475 | 4,480 | +0.11% | 12,700 | 338億2400万 | +71.85% |
| 05/21 | 4,475 | 4,480 | 4,475 | 4,475 | 0% | 21,300 | 337億8625万 | +77.72% |
| 05/20 | 4,480 | 4,480 | 4,475 | 4,475 | +31.04% | 104,100 | 337億8625万 | +84.31% |
| 05/19 | 3,415 | 3,415 | 3,415 | 3,415 | +17.19% | 2,900 | 257億8325万 | +46.07% |
| 05/18 | 2,914 | 2,914 | 2,914 | 2,914 | +20.71% | 300 | 220億70万 | +27.36% |
| 05/15 | (IR情報)19:00 その他の関係会社である大同特殊鋼株式会社による当社株式に対する公開買付けに関する賛同の意見表明及び応募推奨のお知らせ |
| 05/15 | (IR情報)19:00 2026年3月期配当予想の修正(無配)に関するお知らせ |
| 05/15 | (IR情報)19:00 2026年3月期決算短信〔日本基準〕(連結) |
| 05/15 | (IR情報)19:00 役員人事に関するお知らせ |
| 05/15 | 2,310 | 2,446 | 2,310 | 2,414 | +4.82% | 5,200 | 182億2570万 | +6.86% |
| 05/14 | 2,299 | 2,320 | 2,289 | 2,303 | +0.61% | 5,100 | 173億8765万 | +2.4% |
| 05/13 | 2,300 | 2,339 | 2,289 | 2,289 | -0.04% | 3,400 | 172億8195万 | +2.1% |
| 05/12 | 2,289 | 2,320 | 2,270 | 2,290 | +0.84% | 3,900 | 172億8950万 | +2.42% |
| 05/11 | 2,260 | 2,271 | 2,260 | 2,271 | +0.04% | 500 | 171億4605万 | +1.75% |
| 05/08 | (IR情報)16:00 支配株主等に関する事項について |
| 05/08 | 2,257 | 2,270 | 2,255 | 2,270 | +0.13% | 1,800 | 171億3850万 | +1.79% |
| 05/07 | 2,282 | 2,290 | 2,267 | 2,267 | +0.27% | 2,500 | 171億1585万 | +1.8% |
| 05/01 | 2,288 | 2,288 | 2,261 | 2,261 | -1.01% | 300 | 170億7055万 | +1.66% |
| 04/30 | 2,260 | 2,284 | 2,260 | 2,284 | +1.29% | 400 | 172億4420万 | +2.93% |
| 04/28 | 2,305 | 2,305 | 2,245 | 2,255 | -1.53% | 1,300 | 170億2525万 | +1.67% |
| 04/27 | 2,310 | 2,330 | 2,229 | 2,290 | +1.33% | 4,900 | 172億8950万 | +3.2% |
| 04/24 | (IR情報)16:00 2026年3月期連結業績予想の修正に関するお知らせ |
| 04/24 | 2,295 | 2,300 | 2,250 | 2,260 | -1.48% | 4,400 | 170億6300万 | +1.89% |
| 04/23 | 2,270 | 2,295 | 2,270 | 2,294 | +1.06% | 1,100 | 173億1970万 | +3.52% |
| 04/21 | 2,269 | 2,275 | 2,269 | 2,270 | +0.89% | 500 | 171億3850万 | +2.48% |
| 04/17 | 2,225 | 2,250 | 2,225 | 2,250 | +1.12% | 500 | 169億8750万 | +1.63% |
| 04/16 | 2,265 | 2,270 | 2,219 | 2,225 | -0.4% | 2,900 | 167億9875万 | +0.5% |
| 04/15 | 2,250 | 2,250 | 2,234 | 2,234 | +0.18% | 200 | 168億6670万 | +0.95% |
| 04/14 | 2,229 | 2,230 | 2,193 | 2,230 | +0.77% | 900 | 168億3650万 | +0.72% |
| 04/10 | 2,250 | 2,250 | 2,213 | 2,213 | -1.64% | 600 | 167億815万 | -0.18% |
| 04/09 | 2,255 | 2,276 | 2,250 | 2,250 | -0.22% | 400 | 169億8750万 | +1.49% |
| 04/08 | 2,210 | 2,273 | 2,210 | 2,255 | +1.12% | 600 | 170億2525万 | +1.67% |
| 04/07 | 2,191 | 2,258 | 2,191 | 2,230 | +1.13% | 3,900 | 168億3650万 | +0.5% |
| 04/06 | 2,200 | 2,205 | 2,200 | 2,205 | +1.05% | 800 | 166億4775万 | -0.77% |
| 04/03 | 2,182 | 2,182 | 2,182 | 2,182 | +0.51% | 400 | 164億7410万 | -1.93% |
| 04/02 | 2,182 | 2,186 | 2,141 | 2,171 | -0.41% | 400 | 163億9105万 | -2.6% |
| 04/01 | 2,145 | 2,210 | 2,145 | 2,180 | +2.83% | 1,400 | 164億5900万 | -2.42% |
| 03/31 | 2,120 | 2,120 | 2,120 | 2,120 | -1.62% | 100 | 160億600万 | -5.27% |
| 03/30 | 2,149 | 2,158 | 2,149 | 2,155 | -1.42% | 900 | 162億7025万 | -4.05% |
| 03/27 | 2,203 | 2,203 | 2,150 | 2,186 | -1.09% | 1,100 | 165億430万 | -2.8% |
| 03/26 | 2,212 | 2,212 | 2,190 | 2,210 | +0.05% | 800 | 166億8550万 | -1.91% |
| 03/25 | 2,190 | 2,209 | 2,161 | 2,209 | +0.91% | 1,100 | 166億7795万 | -2.08% |
| 03/24 | 2,152 | 2,189 | 2,152 | 2,189 | +3.25% | 1,500 | 165億2695万 | -3.06% |
| 03/23 | 2,220 | 2,220 | 2,050 | 2,120 | -5.99% | 8,200 | 160億600万 | -6.24% |
| 03/19 | 2,290 | 2,290 | 2,255 | 2,255 | -1.53% | 300 | 170億2525万 | -0.49% |
| 03/18 | 2,257 | 2,294 | 2,256 | 2,290 | +1.46% | 1,100 | 172億8950万 | +1.15% |
| 03/17 | 2,236 | 2,257 | 2,236 | 2,257 | +1.26% | 1,100 | 170億4035万 | -0.13% |
| 03/16 | 2,244 | 2,245 | 2,228 | 2,229 | -1.68% | 1,600 | 168億2895万 | -1.24% |
| 03/13 | 2,250 | 2,267 | 2,250 | 2,267 | +0.76% | 200 | 171億1585万 | +0.58% |
| 03/11 | 2,223 | 2,250 | 2,223 | 2,250 | +0.85% | 900 | 169億8750万 | 0% |
| 03/10 | 2,228 | 2,264 | 2,228 | 2,231 | +1.41% | 2,100 | 168億4405万 | -0.62% |
| 03/09 | 2,230 | 2,230 | 2,199 | 2,200 | -3.08% | 2,100 | 166億1000万 | -1.87% |
| 03/06 | 2,256 | 2,271 | 2,256 | 2,270 | -0.92% | 2,500 | 171億3850万 | +1.29% |
| 03/05 | 2,236 | 2,295 | 2,236 | 2,291 | +3.38% | 1,800 | 172億9705万 | +2.32% |
| 03/04 | 2,255 | 2,290 | 2,205 | 2,216 | -2.72% | 8,300 | 167億3080万 | -1.03% |
| 03/03 | 2,289 | 2,311 | 2,265 | 2,278 | -0.52% | 4,900 | 171億9890万 | +1.7% |
| 03/02 | 2,290 | 2,290 | 2,247 | 2,290 | -0.13% | 2,800 | 172億8950万 | +2.32% |
| 02/27 | 2,309 | 2,311 | 2,274 | 2,293 | -0.17% | 3,400 | 173億1215万 | +2.64% |
| 02/26 | 2,287 | 2,324 | 2,268 | 2,297 | +1.28% | 4,800 | 173億4235万 | +2.96% |
| 02/25 | 2,276 | 2,276 | 2,266 | 2,268 | -1.05% | 2,500 | 171億2340万 | +1.75% |
| 02/24 | 2,295 | 2,295 | 2,279 | 2,292 | -0.09% | 1,600 | 173億460万 | +2.78% |
| 02/20 | 2,281 | 2,294 | 2,271 | 2,294 | -0.48% | 2,500 | 173億1970万 | +3.01% |
| 02/19 | 2,250 | 2,305 | 2,250 | 2,305 | +2.67% | 6,300 | 174億275万 | +3.5% |
| 02/18 | 2,299 | 2,299 | 2,243 | 2,245 | -1.97% | 2,500 | 169億4975万 | +0.85% |
| 02/17 | 2,300 | 2,305 | 2,290 | 2,290 | +0.22% | 600 | 172億8950万 | +2.78% |
| 02/16 | 2,254 | 2,285 | 2,241 | 2,285 | +1.38% | 1,800 | 172億5175万 | +2.6% |
| 02/13 | 2,260 | 2,281 | 2,250 | 2,254 | -0.27% | 2,100 | 170億1770万 | +1.44% |
| 02/12 | 2,250 | 2,265 | 2,250 | 2,260 | +0.4% | 2,700 | 170億6300万 | +1.94% |
| 02/10 | 2,225 | 2,282 | 2,225 | 2,251 | +1.99% | 2,600 | 169億9505万 | +1.81% |
| 02/09 | 2,198 | 2,591 | 2,141 | 2,207 | +1.71% | 33,300 | 166億6285万 | +0.09% |
| 02/06 | 2,178 | 2,198 | 2,142 | 2,170 | -0.46% | 5,900 | 163億8350万 | -1.36% |
| 02/05 | 2,159 | 2,186 | 2,150 | 2,180 | +0.37% | 1,600 | 164億5900万 | -0.68% |
| 02/04 | 2,147 | 2,172 | 2,147 | 2,172 | +1.02% | 700 | 163億9860万 | -0.82% |
| 02/03 | 2,128 | 2,150 | 2,128 | 2,150 | +0.84% | 1,700 | 162億3250万 | -1.65% |
| 02/02 | 2,154 | 2,160 | 2,120 | 2,132 | -1.43% | 1,800 | 160億9660万 | -2.29% |
| 01/30 | 2,168 | 2,168 | 2,100 | 2,163 | -0.64% | 4,400 | 163億3065万 | -0.73% |
| 01/29 | 2,216 | 2,218 | 2,177 | 2,177 | -1.63% | 2,700 | 164億3635万 | +0.14% |
| 01/28 | 2,280 | 2,280 | 2,194 | 2,213 | -3.74% | 11,800 | 167億815万 | +2.08% |
| 01/27 | (IR情報)16:00 2026年3月期第3四半期決算短信〔日本基準〕(連結) |
| 01/27 | 2,275 | 2,350 | 2,240 | 2,299 | +3.19% | 10,900 | 173億5745万 | +6.34% |
| 01/26 | 2,225 | 2,230 | 2,208 | 2,228 | +0.13% | 1,100 | 168億2140万 | +3.53% |
| 01/23 | 2,201 | 2,225 | 2,201 | 2,225 | +1.27% | 1,500 | 167億9875万 | +3.78% |
| 01/22 | 2,230 | 2,230 | 2,197 | 2,197 | -1.48% | 500 | 165億8735万 | +2.81% |
| 01/21 | 2,222 | 2,230 | 2,200 | 2,230 | -0.27% | 800 | 168億3650万 | +4.6% |
| 01/20 | 2,264 | 2,264 | 2,236 | 2,236 | -2.19% | 1,300 | 168億8180万 | +5.27% |
| 01/19 | 2,230 | 2,286 | 2,230 | 2,286 | +2.51% | 1,700 | 172億5930万 | +7.98% |
| 01/16 | 2,260 | 2,260 | 2,230 | 2,230 | -2.28% | 3,000 | 168億3650万 | +5.79% |
| 01/15 | 2,245 | 2,283 | 2,245 | 2,282 | -0.35% | 1,600 | 172億2910万 | +8.56% |
| 01/14 | 2,306 | 2,331 | 2,271 | 2,290 | -0.04% | 2,800 | 172億8950万 | +9.46% |
| 01/13 | 2,259 | 2,293 | 2,216 | 2,291 | +1.37% | 4,100 | 172億9705万 | +10.04% |
| 01/09 | 2,186 | 2,260 | 2,159 | 2,260 | +4.68% | 6,300 | 170億6300万 | +9.13% |
| 01/08 | 2,159 | 2,159 | 2,144 | 2,159 | +0.79% | 400 | 163億45万 | +4.75% |
| 01/07 | 2,101 | 2,149 | 2,101 | 2,142 | +1.76% | 3,400 | 161億7210万 | +4.18% |
| 01/06 | 2,108 | 2,108 | 2,105 | 2,105 | -0.09% | 300 | 158億9275万 | +2.63% |
| 01/05 | 2,080 | 2,125 | 2,064 | 2,107 | +2.03% | 4,700 | 159億785万 | +2.88% |
| 2025 |
| 12/30 | 2,054 | 2,083 | 2,054 | 2,065 | +0.44% | 4,400 | 155億9075万 | +0.98% |
| 12/29 | 2,075 | 2,075 | 2,056 | 2,056 | -0.1% | 400 | 155億2280万 | +0.64% |
| 12/26 | 2,071 | 2,071 | 2,054 | 2,058 | 0% | 900 | 155億3790万 | +0.83% |
| 12/25 | 2,072 | 2,072 | 2,057 | 2,058 | +0.15% | 1,300 | 155億3790万 | +0.93% |