| 2018 |
| 12/25 | 391 | 406 | 388 | 394 | -6.64% | 143,900 | 56億8161万 | -19.92% |
| 12/21 | 414 | 434 | 411 | 422 | +1.44% | 41,300 | 60億8538万 | -14.75% |
| 12/20 | 440 | 441 | 415 | 416 | -10.34% | 61,300 | 59億9886万 | -16.63% |
| 12/19 | 451 | 464 | 446 | 464 | +1.09% | 65,400 | 66億9104万 | -7.75% |
| 12/18 | 442 | 465 | 442 | 459 | +0.22% | 61,800 | 66億1893万 | -9.29% |
| 12/17 | 453 | 468 | 450 | 458 | -0.65% | 63,400 | 66億451万 | -10.37% |
| 12/14 | 474 | 477 | 453 | 461 | -4.36% | 29,400 | 66億4777万 | -11.18% |
| 12/13 | 475 | 499 | 471 | 482 | +1.26% | 46,100 | 69億5060万 | -8.54% |
| 12/12 | 462 | 482 | 462 | 476 | +3.03% | 32,900 | 68億6408万 | -10.69% |
| 12/11 | 486 | 486 | 452 | 462 | -3.95% | 93,700 | 66億6219万 | -14.44% |
| 12/10 | 487 | 491 | 471 | 481 | -5.31% | 45,900 | 69億3618万 | -11.9% |
| 12/07 | 506 | 515 | 498 | 508 | +2.01% | 37,700 | 73億2553万 | -8.14% |
| 12/06 | 540 | 546 | 497 | 498 | -7.43% | 84,600 | 71億8133万 | -10.75% |
| 12/05 | 532 | 548 | 527 | 538 | -2.54% | 47,900 | 77億5814万 | -4.1% |
| 12/04 | （IR情報）15:00 当社と太陽誘電株式会社の株式交換契約及び定款一部変更に係る承認決議に関するお知らせ |
| 12/04 | （IR情報）15:00 新株予約権の無償取得および消却ならびに自己株式の消却に関するお知らせ |
| 12/04 | 556 | 569 | 547 | 552 | +0.55% | 34,900 | 79億6003万 | -1.43% |
| 12/03 | （IR情報）16:00 韓国公正取引委員会の決定通知書受領について |
| 12/03 | 549 | 573 | 549 | 549 | +2.81% | 49,000 | 79億1676万 | -1.79% |
| 11/30 | 542 | 548 | 528 | 534 | -2.91% | 49,100 | 77億46万 | -4.13% |
| 11/29 | 556 | 556 | 542 | 550 | +2.42% | 47,000 | 79億3118万 | -1.26% |
| 11/28 | 511 | 540 | 511 | 537 | +5.09% | 109,900 | 77億4372万 | -3.94% |
| 11/27 | 505 | 513 | 504 | 511 | +1.59% | 31,600 | 73億6879万 | -8.91% |
| 11/26 | 500 | 510 | 500 | 503 | -0.98% | 16,800 | 72億5343万 | -10.97% |
| 11/22 | 520 | 520 | 501 | 508 | -2.12% | 34,200 | 73億2553万 | -10.88% |
| 11/21 | 499 | 520 | 490 | 519 | +3.8% | 63,500 | 74億8415万 | -9.42% |
| 11/20 | 498 | 512 | 488 | 500 | -1.19% | 67,100 | 72億1017万 | -13.49% |
| 11/19 | 498 | 513 | 496 | 506 | +3.27% | 32,800 | 72億9669万 | -13.06% |
| 11/16 | （IR情報）15:00 定款一部変更に関するお知らせ |
| 11/16 | 516 | 518 | 490 | 490 | -3.16% | 59,800 | 70億6596万 | -16.38% |
| 11/15 | 527 | 527 | 506 | 506 | -4.35% | 66,300 | 72億9669万 | -14.24% |
| 11/14 | 548 | 555 | 529 | 529 | -1.67% | 69,100 | 76億2836万 | -10.79% |
| 11/13 | 569 | 569 | 526 | 538 | -6.43% | 73,700 | 77億5814万 | -9.88% |
| 11/12 | 611 | 611 | 565 | 575 | -11.67% | 67,000 | 82億9169万 | -4.01% |
| 11/09 | （IR情報）15:00 平成30年12月期第3四半期決算短信〔日本基準〕(連結) |
| 11/09 | 658 | 665 | 642 | 651 | -2.25% | 67,000 | 93億8764万 | +8.32% |
| 11/08 | 668 | 687 | 665 | 666 | +2.78% | 86,600 | 96億394万 | +10.82% |
| 11/07 | 635 | 664 | 630 | 648 | +3.02% | 79,300 | 93億4438万 | +8% |
| 11/06 | 630 | 642 | 618 | 629 | -0.47% | 33,500 | 90億7039万 | +5.01% |
| 11/05 | 642 | 654 | 632 | 632 | -2.62% | 42,500 | 91億1365万 | +4.81% |
| 11/02 | 623 | 651 | 602 | 649 | +2.53% | 80,300 | 93億5880万 | +5.87% |
| 11/01 | 626 | 659 | 624 | 633 | +11.84% | 141,600 | 91億2807万 | +1.61% |
| 10/31 | （IR情報）15:00 米国集団民事訴訟の和解及び特別損失の計上について |
| 10/31 | 544 | 567 | 537 | 566 | +6.79% | 33,700 | 81億6191万 | -10.73% |
| 10/30 | 500 | 531 | 496 | 530 | +4.54% | 35,000 | 76億4278万 | -18.21% |
| 10/29 | 517 | 527 | 505 | 507 | -2.12% | 56,900 | 73億1111万 | -23.53% |
| 10/26 | 553 | 553 | 504 | 518 | -2.81% | 77,800 | 74億6973万 | -23.71% |
| 10/25 | 565 | 565 | 532 | 533 | -7.94% | 70,300 | 76億8604万 | -23.42% |
| 10/24 | 596 | 598 | 576 | 579 | -2.85% | 41,900 | 83億4937万 | -18.57% |
| 10/23 | 611 | 622 | 596 | 596 | -2.45% | 32,400 | 85億9452万 | -17.57% |
| 10/22 | 590 | 614 | 586 | 611 | -1.29% | 24,100 | 88億1083万 | -16.76% |
| 10/19 | 593 | 619 | 577 | 619 | +2.31% | 59,800 | 89億2619万 | -16.91% |
| 10/18 | 624 | 624 | 602 | 605 | -3.04% | 21,600 | 87億2430万 | -19.97% |
| 10/17 | 630 | 645 | 624 | 624 | +4% | 50,700 | 89億9829万 | -18.86% |
| 10/16 | 609 | 613 | 582 | 600 | -0.83% | 32,700 | 86億5220万 | -23.18% |
| 10/15 | 601 | 632 | 593 | 605 | -0.98% | 57,800 | 87億2430万 | -23.8% |
| 10/12 | 573 | 615 | 573 | 611 | +4.8% | 63,300 | 88億1083万 | -24.29% |
| 10/11 | 562 | 583 | 556 | 583 | -3.95% | 71,700 | 84億706万 | -28.82% |
| 10/10 | 600 | 614 | 595 | 607 | +1.68% | 45,100 | 87億5314万 | -27.04% |
| 10/09 | 614 | 614 | 597 | 597 | -4.63% | 74,300 | 86億894万 | -29.43% |
| 10/05 | 645 | 646 | 626 | 626 | -2.95% | 81,300 | 90億2713万 | -27.29% |
| 10/04 | 648 | 655 | 638 | 645 | +1.1% | 92,300 | 93億112万 | -26.2% |
| 10/03 | 646 | 667 | 636 | 638 | 0% | 171,900 | 92億18万 | -28.07% |
| 10/02 | 646 | 657 | 632 | 638 | -12.96% | 492,100 | 92億18万 | -29.27% |
| 10/01 | 733 | 733 | 733 | 733 | -16.99% | 12,200 | 105億7011万 | -19.89% |
| 10/01 | 株式併合 10→1 |
| 09/28 | （IR情報）15:00 太陽誘電株式会社によるエルナー株式会社の株式交換による完全子会社化に関するお知らせ |
| 09/28 | 897 | 898 | 880 | 883 | -1.67% | 32,100 | 127億3316万 | -4.44% |
| 09/27 | 896 | 935 | 876 | 898 | -0.77% | 49,800 | 129億4946万 | -2.92% |
| 09/26 | 900 | 911 | 884 | 905 | +0.56% | 30,600 | 130億5041万 | -2.27% |
| 09/25 | 900 | 910 | 890 | 900 | -1.1% | 25,300 | 129億7831万 | -2.91% |
| 09/21 | 910 | 920 | 900 | 910 | 0% | 21,300 | 131億2251万 | -1.83% |
| 09/20 | 940 | 950 | 910 | 910 | -4.21% | 31,100 | 131億2251万 | -1.73% |
| 09/19 | 910 | 950 | 900 | 950 | +4.4% | 44,200 | 136億9932万 | +2.59% |
| 09/18 | 880 | 910 | 870 | 910 | +3.41% | 57,500 | 131億2251万 | -1.62% |
| 09/14 | 880 | 890 | 880 | 880 | +1.15% | 19,200 | 126億8990万 | -4.97% |
| 09/13 | 880 | 890 | 870 | 870 | 0% | 31,200 | 125億4570万 | -6.45% |
| 09/12 | 900 | 910 | 860 | 870 | -4.4% | 88,400 | 125億4570万 | -7.05% |
| 09/11 | 930 | 930 | 900 | 910 | -1.09% | 46,600 | 131億2251万 | -3.29% |
| 09/10 | 910 | 930 | 910 | 920 | -1.08% | 24,400 | 132億6671万 | -2.54% |
| 09/07 | 920 | 930 | 910 | 930 | +2.2% | 34,300 | 134億1092万 | -1.8% |
| 09/06 | 930 | 930 | 910 | 910 | -2.15% | 23,400 | 131億2251万 | -4.31% |
| 09/05 | 930 | 940 | 920 | 930 | +1.09% | 16,100 | 134億1092万 | -2.92% |
| 09/04 | 930 | 940 | 920 | 920 | 0% | 21,000 | 132億6671万 | -4.56% |
| 09/03 | 950 | 960 | 920 | 920 | -3.16% | 52,800 | 132億6671万 | -4.96% |
| 08/31 | 960 | 980 | 950 | 950 | -1.04% | 40,700 | 136億9932万 | -2.26% |
| 08/30 | 980 | 980 | 960 | 960 | -1.03% | 36,500 | 138億4353万 | -1.44% |
| 08/29 | 970 | 980 | 970 | 970 | 0% | 27,100 | 139億8773万 | -0.41% |
| 08/28 | 1,000 | 1,000 | 960 | 970 | -3% | 39,300 | 139億8773万 | -0.61% |
| 08/27 | 980 | 1,000 | 960 | 1,000 | +3.09% | 59,300 | 144億2034万 | +2.67% |
| 08/24 | 950 | 980 | 940 | 970 | +2.11% | 73,000 | 139億8773万 | 0% |
| 08/23 | 920 | 950 | 910 | 950 | +3.26% | 41,300 | 136億9932万 | -1.86% |
| 08/22 | 930 | 950 | 920 | 920 | 0% | 38,500 | 132億6671万 | -4.86% |
| 08/21 | 920 | 930 | 920 | 920 | 0% | 35,900 | 132億6671万 | -4.76% |
| 08/20 | 900 | 930 | 900 | 920 | +2.22% | 20,400 | 132億6671万 | -4.66% |
| 08/17 | 910 | 910 | 890 | 900 | 0% | 27,900 | 129億7831万 | -6.74% |
| 08/16 | 900 | 920 | 890 | 900 | 0% | 45,100 | 129億7831万 | -6.74% |
| 08/15 | 920 | 930 | 900 | 900 | -2.17% | 42,600 | 129億7831万 | -6.83% |
| 08/14 | 930 | 940 | 910 | 920 | -1.08% | 42,200 | 132億6671万 | -4.76% |
| 08/13 | 930 | 960 | 910 | 930 | -7% | 108,600 | 134億1092万 | -3.93% |
| 08/10 | （IR情報）15:00 営業外収益および特別損失の計上に関するお知らせ |
| 08/10 | （IR情報）15:00 平成30年12月期第2四半期決算短信〔日本基準〕(連結) |
| 08/10 | 1,010 | 1,020 | 990 | 1,000 | -0.99% | 80,800 | 144億2034万 | +3.31% |
| 08/09 | 980 | 1,010 | 980 | 1,010 | +1% | 53,300 | 145億6454万 | +4.77% |
| 08/08 | 1,000 | 1,010 | 990 | 1,000 | +1.01% | 61,100 | 144億2034万 | +4.06% |
| 08/07 | 990 | 1,030 | 990 | 990 | 0% | 75,200 | 142億7614万 | +3.34% |
| 08/06 | 1,000 | 1,020 | 970 | 990 | -2.94% | 117,800 | 142億7614万 | +3.34% |
| 08/03 | 1,080 | 1,090 | 1,010 | 1,020 | -6.42% | 198,500 | 147億875万 | +6.69% |
| 08/02 | 1,110 | 1,120 | 1,060 | 1,090 | 0% | 184,800 | 157億1817万 | +14.26% |
| 08/01 | 1,040 | 1,100 | 1,020 | 1,090 | +6.86% | 203,300 | 157億1817万 | +15.1% |
