| 2018 |
| 09/25 | （IR情報）15:00 スポンサー支援に関する合意書締結のお知らせ |
| 09/25 | 1,297 | 1,325 | 1,277 | 1,307 | -0.53% | 2,900 | 47億8330万 | +4.39% |
| 09/21 | 1,280 | 1,340 | 1,280 | 1,314 | +2.5% | 4,800 | 48億892万 | +5.37% |
| 09/20 | 1,335 | 1,335 | 1,279 | 1,282 | -3.97% | 4,500 | 46億9181万 | +3.14% |
| 09/19 | 1,396 | 1,446 | 1,333 | 1,335 | -3.47% | 12,600 | 48億8577万 | +7.57% |
| 09/18 | 1,295 | 1,383 | 1,265 | 1,383 | +10.91% | 23,600 | 50億6144万 | +11.71% |
| 09/14 | 1,220 | 1,248 | 1,220 | 1,247 | +2.21% | 3,800 | 45億6372万 | +1.14% |
| 09/13 | 1,207 | 1,237 | 1,207 | 1,220 | -0.57% | 3,900 | 44億6490万 | -2.24% |
| 09/12 | 1,227 | 1,237 | 1,215 | 1,227 | +0.57% | 3,000 | 44億9052万 | -2.85% |
| 09/11 | 1,211 | 1,233 | 1,211 | 1,220 | +0.16% | 6,600 | 44億6490万 | -4.69% |
| 09/10 | 1,221 | 1,225 | 1,204 | 1,218 | -1.22% | 6,000 | 44億5758万 | -6.02% |
| 09/07 | 1,239 | 1,239 | 1,206 | 1,233 | -0.48% | 7,700 | 45億1248万 | -6.16% |
| 09/06 | 1,228 | 1,239 | 1,209 | 1,239 | -1.51% | 3,700 | 45億3444万 | -6.98% |
| 09/05 | 1,239 | 1,273 | 1,223 | 1,258 | +2.44% | 5,500 | 46億397万 | -6.88% |
| 09/04 | 1,216 | 1,245 | 1,216 | 1,228 | -1.21% | 2,500 | 44億9418万 | -10.3% |
| 09/03 | （IR情報）15:40 ダイヤモンドエレクトリックホールディングス株式会社の新規上場承認に関するお知らせ |
| 09/03 | 1,271 | 1,271 | 1,236 | 1,243 | -1.58% | 1,800 | 45億4908万 | -10.45% |
| 08/31 | 1,287 | 1,287 | 1,258 | 1,263 | -1.86% | 1,700 | 46億2227万 | -10.23% |
| 08/30 | 1,277 | 1,287 | 1,226 | 1,287 | +1.42% | 24,800 | 47億1011万 | -9.68% |
| 08/29 | 1,252 | 1,270 | 1,250 | 1,269 | +0.4% | 5,800 | 46億4423万 | -12.06% |
| 08/28 | 1,235 | 1,270 | 1,232 | 1,264 | +2.68% | 14,300 | 46億2593万 | -13.25% |
| 08/27 | 1,202 | 1,237 | 1,200 | 1,231 | +2.41% | 15,100 | 45億516万 | -16.26% |
| 08/24 | 1,219 | 1,219 | 1,200 | 1,202 | -0.99% | 4,100 | 43億9903万 | -18.89% |
| 08/23 | 1,230 | 1,235 | 1,211 | 1,214 | +1.17% | 10,200 | 44億4294万 | -18.85% |
| 08/22 | 1,200 | 1,224 | 1,190 | 1,200 | 0% | 10,500 | 43億9171万 | -20.53% |
| 08/21 | 1,205 | 1,205 | 1,200 | 1,200 | -0.41% | 2,100 | 43億9171万 | -21.21% |
| 08/20 | 1,202 | 1,207 | 1,202 | 1,205 | +0.33% | 4,200 | 44億1001万 | -21.55% |
| 08/17 | 1,207 | 1,218 | 1,196 | 1,201 | -0.5% | 6,700 | 43億9537万 | -22.42% |
| 08/16 | 1,260 | 1,260 | 1,184 | 1,207 | -1.87% | 29,400 | 44億1733万 | -22.68% |
| 08/15 | 1,263 | 1,266 | 1,230 | 1,230 | -2.07% | 12,200 | 45億150万 | -21.86% |
| 08/14 | 1,272 | 1,279 | 1,241 | 1,256 | -0.4% | 31,500 | 45億9665万 | -20.81% |
| 08/13 | 1,252 | 1,293 | 1,241 | 1,261 | -21.77% | 96,700 | 46億1495万 | -21.04% |
| 08/10 | （IR情報）15:00 平成31年3月期第1四半期決算短信〔日本基準〕(連結) |
| 08/10 | 1,641 | 1,641 | 1,600 | 1,612 | +0.12% | 4,000 | 58億9953万 | +0.44% |
| 08/09 | 1,641 | 1,641 | 1,601 | 1,610 | -1.71% | 2,900 | 58億9221万 | +0.75% |
| 08/08 | 1,632 | 1,650 | 1,600 | 1,638 | -0.24% | 6,700 | 59億9468万 | +2.82% |
| 08/07 | 1,654 | 1,654 | 1,630 | 1,642 | -1.38% | 3,100 | 60億932万 | +3.34% |
| 08/06 | 1,693 | 1,693 | 1,665 | 1,665 | -1.3% | 4,200 | 60億9350万 | +4.98% |
| 08/03 | 1,720 | 1,740 | 1,687 | 1,687 | -0.53% | 4,800 | 61億7401万 | +6.57% |
| 08/02 | 1,701 | 1,702 | 1,691 | 1,696 | -1.62% | 2,400 | 62億695万 | +7.41% |
| 08/01 | 1,680 | 1,735 | 1,663 | 1,724 | +2.01% | 6,800 | 63億942万 | +9.46% |
| 07/31 | 1,686 | 1,711 | 1,675 | 1,690 | -1.23% | 10,200 | 61億8499万 | +7.64% |
| 07/30 | 1,742 | 1,758 | 1,711 | 1,711 | -0.81% | 8,200 | 62億6184万 | +9.26% |
| 07/27 | 1,744 | 1,774 | 1,705 | 1,725 | -1.15% | 11,500 | 63億1308万 | +10.29% |
| 07/26 | 1,618 | 1,925 | 1,618 | 1,745 | +7.92% | 56,600 | 63億8628万 | +11.86% |
| 07/25 | 1,591 | 1,617 | 1,571 | 1,617 | +2.73% | 7,700 | 59億1783万 | +4.05% |
| 07/24 | 1,538 | 1,580 | 1,538 | 1,574 | +1.94% | 2,300 | 57億6046万 | +1.35% |
| 07/23 | 1,551 | 1,570 | 1,532 | 1,544 | -0.9% | 4,000 | 56億5066万 | -0.77% |
| 07/20 | 1,536 | 1,597 | 1,536 | 1,558 | +0.39% | 4,200 | 57億190万 | -0.32% |
| 07/19 | 1,547 | 1,552 | 1,536 | 1,552 | +1.11% | 4,000 | 56億7994万 | -0.96% |
| 07/18 | 1,515 | 1,545 | 1,511 | 1,535 | +1.93% | 3,500 | 56億1773万 | -2.23% |
| 07/17 | 1,540 | 1,540 | 1,500 | 1,506 | -1.25% | 16,500 | 55億1159万 | -4.26% |
| 07/13 | 1,511 | 1,540 | 1,511 | 1,525 | +1.33% | 8,600 | 55億8113万 | -3.36% |
| 07/12 | 1,515 | 1,520 | 1,487 | 1,505 | -1.76% | 10,800 | 55億793万 | -4.93% |
| 07/11 | 1,540 | 1,540 | 1,480 | 1,532 | -0.52% | 7,500 | 56億675万 | -3.47% |
| 07/10 | 1,544 | 1,544 | 1,530 | 1,540 | +1.05% | 8,900 | 56億3603万 | -3.14% |
| 07/09 | 1,490 | 1,556 | 1,490 | 1,524 | +3.39% | 5,400 | 55億7747万 | -4.33% |
| 07/06 | 1,450 | 1,490 | 1,443 | 1,474 | +2.72% | 7,200 | 53億9448万 | -7.7% |
| 07/05 | 1,500 | 1,500 | 1,420 | 1,435 | -3.56% | 11,900 | 52億5175万 | -10.48% |
| 07/04 | 1,511 | 1,511 | 1,488 | 1,488 | -2.17% | 6,000 | 54億4572万 | -7.52% |
| 07/03 | 1,591 | 1,591 | 1,470 | 1,521 | -4.16% | 9,200 | 55億6649万 | -5.82% |
| 07/02 | （5%ルール）ダイヤモンドエンジニアリング（13.89%）池永重彦（9.99%） |
| 07/02 | 1,598 | 1,600 | 1,587 | 1,587 | +0.19% | 2,100 | 58億803万 | -2.04% |
| 06/29 | 1,594 | 1,596 | 1,578 | 1,584 | +0.25% | 3,200 | 57億9705万 | -2.46% |
| 06/28 | 1,594 | 1,594 | 1,563 | 1,580 | -0.88% | 5,600 | 57億8242万 | -3.01% |
| 06/27 | 1,588 | 1,603 | 1,584 | 1,594 | -0.62% | 5,700 | 58億3365万 | -2.51% |
| 06/26 | （IR情報）17:00 新経営体制発足に関するお知らせ |
| 06/26 | 1,585 | 1,619 | 1,585 | 1,604 | +0.12% | 5,700 | 58億7025万 | -2.25% |
| 06/25 | 1,658 | 1,667 | 1,600 | 1,602 | -3.26% | 8,600 | 58億6293万 | -2.79% |
| 06/22 | （IR情報）17:10 株式報酬としての自己株式の処分に関するお知らせ |
| 06/22 | 1,632 | 1,656 | 1,616 | 1,656 | +2.22% | 6,600 | 60億6056万 | +0.06% |
| 06/21 | 1,600 | 1,644 | 1,592 | 1,620 | +2.14% | 10,000 | 59億2881万 | -2.35% |
| 06/20 | 1,611 | 1,611 | 1,560 | 1,586 | -1.49% | 13,800 | 58億437万 | -4.63% |
| 06/19 | 1,647 | 1,680 | 1,610 | 1,610 | -2.19% | 14,300 | 58億9221万 | -3.54% |
| 06/18 | 1,714 | 1,714 | 1,627 | 1,646 | -4.41% | 16,600 | 60億2396万 | -1.85% |
| 06/15 | 1,654 | 1,744 | 1,643 | 1,722 | +5.13% | 11,900 | 63億210万 | +2.07% |
| 06/14 | 1,625 | 1,645 | 1,625 | 1,638 | +0.31% | 5,200 | 59億9468万 | -3.59% |
| 06/13 | 1,631 | 1,637 | 1,622 | 1,633 | +0.74% | 3,900 | 59億7638万 | -4.89% |
| 06/12 | 1,633 | 1,633 | 1,617 | 1,621 | -0.61% | 6,500 | 59億3247万 | -6.57% |
| 06/11 | 1,653 | 1,653 | 1,618 | 1,631 | -0.12% | 3,100 | 59億6906万 | -6.85% |
| 06/08 | 1,614 | 1,638 | 1,614 | 1,633 | +0.93% | 6,000 | 59億7638万 | -7.37% |
| 06/07 | 1,635 | 1,635 | 1,605 | 1,618 | +1% | 5,600 | 59億2149万 | -8.9% |
| 06/06 | 1,625 | 1,625 | 1,591 | 1,602 | -0.8% | 6,100 | 58億6293万 | -10.45% |
| 06/05 | 1,650 | 1,650 | 1,612 | 1,615 | -0.98% | 8,500 | 59億1051万 | -10.43% |
| 06/04 | 1,613 | 1,645 | 1,613 | 1,631 | +1.24% | 3,200 | 59億6906万 | -10.19% |
| 06/01 | 1,605 | 1,616 | 1,587 | 1,611 | +0.44% | 3,800 | 58億9587万 | -11.92% |
| 05/31 | 1,635 | 1,635 | 1,593 | 1,604 | -1.11% | 9,800 | 58億7025万 | -12.97% |
| 05/30 | 1,622 | 1,650 | 1,609 | 1,622 | -2.41% | 11,500 | 59億3613万 | -12.7% |
| 05/29 | 1,680 | 1,695 | 1,650 | 1,662 | -1.25% | 8,100 | 60億8252万 | -11.22% |
| 05/28 | 1,717 | 1,717 | 1,678 | 1,683 | -1% | 7,800 | 61億5937万 | -10.57% |
| 05/25 | （IR情報）18:10 (訂正)「単独株式移転による純粋持株会社設立に関するお知らせ」の一部訂正について |
| 05/25 | 1,713 | 1,714 | 1,700 | 1,700 | -1.45% | 10,800 | 62億2159万 | -10.05% |
| 05/24 | 1,758 | 1,758 | 1,725 | 1,725 | -1.82% | 18,600 | 63億1308万 | -9.11% |
| 05/23 | 1,754 | 1,774 | 1,754 | 1,757 | -0.28% | 5,400 | 64億3019万 | -7.96% |
| 05/22 | 1,761 | 1,785 | 1,756 | 1,762 | -0.73% | 5,300 | 64億4849万 | -8.28% |
| 05/21 | （IR情報）16:00 単独株式移転による純粋持株会社設立に関するお知らせ |
| 05/21 | （IR情報）16:00 剰余金の配当に関するお知らせ |
| 05/21 | （IR情報）16:00 公認会計士等の異動に関するお知らせ |
| 05/21 | 1,752 | 1,784 | 1,752 | 1,775 | +0.91% | 5,400 | 64億9607万 | -8.13% |
| 05/18 | 1,767 | 1,768 | 1,736 | 1,759 | +1.03% | 4,200 | 64億3751万 | -9.52% |
| 05/17 | 1,713 | 1,769 | 1,694 | 1,741 | +0.99% | 17,800 | 63億7164万 | -11.04% |
| 05/16 | 1,797 | 1,797 | 1,698 | 1,724 | -4.17% | 37,300 | 63億942万 | -12.4% |
| 05/15 | 1,921 | 1,933 | 1,782 | 1,799 | -5.42% | 33,900 | 65億8390万 | -9.23% |
| 05/14 | （IR情報）15:10 連結子会社の繰延税金資産の取り崩しに関するお知らせ |
| 05/14 | （IR情報）11:00 平成30年3月期決算短信〔日本基準〕(連結) |
| 05/14 | （IR情報）11:00 平成30年3月期配当予想の修正に関するお知らせ |
| 05/14 | 2,027 | 2,119 | 1,850 | 1,902 | -6.72% | 57,800 | 69億6086万 | -4.57% |
| 05/11 | 2,102 | 2,102 | 2,003 | 2,039 | -2.3% | 8,700 | 74億6225万 | +1.85% |
| 05/10 | 2,142 | 2,178 | 2,083 | 2,087 | +0.82% | 6,700 | 76億3791万 | +4.04% |
| 05/09 | 2,002 | 2,125 | 2,002 | 2,070 | +2.48% | 9,900 | 75億7570万 | +2.99% |
| 05/08 | 1,985 | 2,030 | 1,952 | 2,020 | +3.86% | 8,400 | 73億9271万 | +0.05% |
| 05/07 | 1,962 | 1,972 | 1,945 | 1,945 | -0.26% | 1,900 | 71億1823万 | -4.05% |
| 05/02 | 1,952 | 1,969 | 1,916 | 1,950 | -0.1% | 6,700 | 71億3653万 | -4.46% |
