| 2024 |
| 11/11 | 3,596 | 3,626 | 3,496 | 3,538 | -2.43% | 1,545,300 | 7105億8541万 | -1.48% |
| 11/08 | 3,606 | 3,695 | 3,562 | 3,626 | +0.58% | 2,483,000 | 7282億5967万 | +0.69% |
| 11/08 | （空売り報告）JPM Securities Japan Co Ltd. 1,473,430株（0.73%）+0.07% |
| 11/07 | （IR情報）13:00 2025年3月期第2四半期(中間期)決算短信[IFRS](連結) |
| 11/07 | （IR情報）13:00 2024年度第2四半期(中間期)決算の概要及び2024年度業績予想の概要 |
| 11/07 | 3,638 | 3,692 | 3,462 | 3,605 | +0.39% | 4,535,700 | 7240億4195万 | -0.03% |
| 11/07 | （空売り報告）Integrated Core Strategies (Asia) Pte. Ltd. 1,402,077株（0.69%）-0.01% |
| 11/06 | 3,579 | 3,635 | 3,552 | 3,591 | +0.87% | 1,326,800 | 7212億3013万 | -0.66% |
| 11/05 | 3,545 | 3,563 | 3,483 | 3,560 | +2.33% | 1,580,500 | 7150億398万 | -1.77% |
| 11/01 | 3,480 | 3,502 | 3,462 | 3,479 | -1.19% | 1,054,000 | 6987億3563万 | -4.37% |
| 11/01 | （空売り報告）JPM Securities Japan Co Ltd. 1,332,671株（0.66%）-0.05% |
| 11/01 | （空売り報告）Integrated Core Strategies (Asia) Pte. Ltd. 1,410,977株（0.7%）+0.07% |
| 10/31 | 3,530 | 3,556 | 3,491 | 3,521 | -0.25% | 1,040,900 | 7071億7107万 | -3.72% |
| 10/30 | 3,534 | 3,549 | 3,515 | 3,530 | +0.46% | 2,077,000 | 7089億7866万 | -3.89% |
| 10/29 | 3,510 | 3,526 | 3,493 | 3,514 | +0.51% | 678,000 | 7057億6516万 | -4.69% |
| 10/28 | 3,421 | 3,503 | 3,406 | 3,496 | +0.95% | 772,700 | 7021億4997万 | -5.56% |
| 10/25 | 3,484 | 3,489 | 3,432 | 3,463 | -0.97% | 792,200 | 6955億2213万 | -6.81% |
| 10/24 | 3,501 | 3,509 | 3,458 | 3,497 | -0.74% | 837,600 | 7023億5082万 | -6.2% |
| 10/23 | 3,558 | 3,583 | 3,512 | 3,523 | -0.98% | 743,000 | 7075億7276万 | -5.8% |
| 10/22 | 3,576 | 3,609 | 3,540 | 3,558 | +0.31% | 1,493,300 | 7146億229万 | -5.12% |
| 10/22 | （空売り報告）JPM Securities Japan Co Ltd. 1,427,520株（0.71%）+0.06% |
| 10/21 | 3,545 | 3,580 | 3,523 | 3,547 | +0.77% | 1,065,600 | 7123億9301万 | -5.69% |
| 10/21 | （空売り報告）JPM Securities Japan Co Ltd. 1,314,020株（0.65%）新規 |
| 10/21 | （空売り報告）Integrated Core Strategies (Asia) Pte. Ltd. 1,284,798株（0.63%）+0.06% |
| 10/18 | 3,605 | 3,610 | 3,518 | 3,520 | -1.65% | 709,000 | 7069億7022万 | -6.56% |
| 10/17 | 3,570 | 3,597 | 3,564 | 3,579 | +0.51% | 949,900 | 7188億2001万 | -5.24% |
| 10/16 | 3,561 | 3,627 | 3,543 | 3,561 | -2.57% | 1,347,700 | 7152億482万 | -5.97% |
| 10/16 | （空売り報告）Integrated Core Strategies (Asia) Pte. Ltd. 1,160,502株（0.57%）再IN |
| 10/15 | 3,665 | 3,706 | 3,636 | 3,655 | -0.22% | 1,570,700 | 7340億8414万 | -3.74% |
| 10/11 | 3,675 | 3,688 | 3,645 | 3,663 | -0.49% | 1,243,300 | 7356億9089万 | -3.76% |
| 10/10 | 3,730 | 3,733 | 3,673 | 3,681 | -1.07% | 1,073,600 | 7393億608万 | -3.51% |
| 10/09 | （IR情報）13:30 「千葉地区エチレン装置集約による生産最適化」検討のFEED移行について |
| 10/09 | 3,734 | 3,748 | 3,673 | 3,721 | -0.48% | 1,186,000 | 7473億3983万 | -2.8% |
| 10/08 | 3,771 | 3,787 | 3,702 | 3,739 | -1.81% | 1,000,700 | 7509億5502万 | -2.55% |
| 10/07 | 3,851 | 3,853 | 3,796 | 3,808 | +0.24% | 763,400 | 7648億1324万 | -0.91% |
| 10/04 | 3,772 | 3,799 | 3,746 | 3,799 | +0.34% | 822,500 | 7630億565万 | -1.2% |
| 10/03 | 3,830 | 3,839 | 3,780 | 3,786 | +0.53% | 1,310,300 | 7603億9468万 | -1.53% |
| 10/02 | 3,755 | 3,818 | 3,743 | 3,766 | -1.34% | 1,033,200 | 7563億7780万 | -2.08% |
| 10/02 | （IR情報）9:00 大阪石油化学株式会社エチレンプラント生産再開について |
| 10/01 | 3,816 | 3,829 | 3,755 | 3,817 | +0.32% | 1,108,000 | 7666億2084万 | -0.73% |
| 09/30 | 3,776 | 3,806 | 3,751 | 3,805 | -2.83% | 1,359,500 | 7642億1071万 | -0.99% |
| 09/27 | 3,856 | 3,936 | 3,828 | 3,916 | -1.01% | 1,431,500 | 7865億437万 | +1.95% |
| 09/26 | 3,921 | 3,962 | 3,894 | 3,956 | +0.89% | 1,478,500 | 7945億3813万 | +3.18% |
| 09/25 | 3,900 | 3,944 | 3,875 | 3,921 | +0.85% | 905,000 | 7875億859万 | +2.56% |
| 09/24 | （5%ルール）みずほ証券（0.39%）アセットマネジメントOneインターナショナル(Asse…（0.02%）アセットマネジメントOne（6.26%）みずほ銀行（0.28%） |
| 09/24 | 3,892 | 3,909 | 3,841 | 3,888 | +0.21% | 1,327,300 | 7808億8075万 | +1.99% |
| 09/20 | 3,898 | 3,936 | 3,866 | 3,880 | +0.65% | 1,014,000 | 7792億7400万 | +1.97% |
| 09/19 | 3,830 | 3,912 | 3,825 | 3,855 | +2.34% | 867,700 | 7742億5290万 | +1.66% |
| 09/18 | 3,797 | 3,832 | 3,750 | 3,767 | -0.53% | 760,200 | 7565億7865万 | -0.29% |
| 09/17 | 3,810 | 3,833 | 3,740 | 3,787 | +0.19% | 621,500 | 7605億9552万 | +0.72% |
| 09/13 | 3,802 | 3,815 | 3,767 | 3,780 | -1.05% | 739,000 | 7591億8962万 | +1.15% |
| 09/12 | 3,835 | 3,862 | 3,781 | 3,820 | +3.38% | 817,900 | 7672億2337万 | +2.77% |
| 09/11 | 3,764 | 3,779 | 3,653 | 3,695 | -2.56% | 848,700 | 7421億1789万 | -0.08% |
| 09/10 | 3,819 | 3,847 | 3,788 | 3,792 | -0.39% | 645,000 | 7615億9974万 | +2.63% |
| 09/09 | 3,716 | 3,810 | 3,693 | 3,807 | -0.6% | 829,600 | 7646億1240万 | +3.34% |
| 09/06 | 3,875 | 3,890 | 3,802 | 3,830 | -1.34% | 1,163,800 | 7692億3181万 | +3.96% |
| 09/05 | 3,801 | 3,927 | 3,759 | 3,882 | 0% | 875,100 | 7796億7568万 | +4.92% |
| 09/04 | 3,865 | 3,932 | 3,832 | 3,882 | -3.07% | 1,516,500 | 7796億7568万 | +4.35% |
| 09/03 | 3,977 | 4,052 | 3,964 | 4,005 | +1.52% | 1,374,400 | 8043億7947万 | +7.14% |
| 09/02 | 3,999 | 4,007 | 3,929 | 3,945 | +1.39% | 1,229,200 | 7923億2885万 | +5.2% |
| 08/30 | 3,842 | 3,907 | 3,838 | 3,891 | +0.72% | 1,261,000 | 7814億8328万 | +3.46% |
| 08/29 | 3,782 | 3,863 | 3,762 | 3,863 | +2.03% | 1,020,900 | 7758億5965万 | +2.33% |
| 08/28 | 3,799 | 3,800 | 3,748 | 3,786 | -0.63% | 694,500 | 7603億9468万 | -0.21% |
| 08/27 | 3,753 | 3,825 | 3,724 | 3,810 | +1.52% | 1,186,900 | 7652億1493万 | -0.31% |
| 08/26 | 3,752 | 3,771 | 3,701 | 3,753 | -0.13% | 891,700 | 7537億6683万 | -2.47% |
| 08/23 | 3,760 | 3,784 | 3,736 | 3,758 | +0.16% | 953,700 | 7547億7105万 | -3.07% |
| 08/22 | 3,786 | 3,798 | 3,730 | 3,752 | +0.03% | 1,353,500 | 7535億6599万 | -3.97% |
| 08/21 | 3,640 | 3,778 | 3,611 | 3,751 | +2.15% | 2,181,200 | 7533億6515万 | -4.77% |
| 08/21 | （IR情報）9:00 大阪石油化学株式会社エチレンプラント生産再開の見通しについて |
| 08/20 | 3,710 | 3,714 | 3,638 | 3,672 | +0.49% | 1,463,600 | 7374億9848万 | -7.37% |
| 08/19 | 3,700 | 3,748 | 3,646 | 3,654 | -1.48% | 2,001,800 | 7338億8330万 | -8.47% |
| 08/16 | 3,635 | 3,733 | 3,625 | 3,709 | +4.04% | 2,567,500 | 7449億2970万 | -7.81% |
| 08/15 | 3,580 | 3,635 | 3,555 | 3,565 | +2.3% | 2,486,700 | 7160億820万 | -11.95% |
| 08/14 | 3,350 | 3,496 | 3,319 | 3,485 | +4.97% | 2,403,100 | 6999億4069万 | -14.63% |
| 08/13 | 3,260 | 3,320 | 3,240 | 3,320 | +3.39% | 1,489,900 | 6668億146万 | -19.32% |
| 08/09 | 3,335 | 3,338 | 3,167 | 3,211 | -2.19% | 2,866,200 | 6449億948万 | -22.76% |
| 08/08 | 3,342 | 3,389 | 3,270 | 3,283 | -1.74% | 2,454,900 | 6593億7024万 | -21.98% |
| 08/07 | 3,277 | 3,437 | 3,220 | 3,341 | -7.89% | 4,671,800 | 6710億1918万 | -21.5% |
| 08/06 | （IR情報）13:00 2024年度第1四半期決算の概要及び2024年度上期業績予想の概要 |
| 08/06 | （IR情報）13:00 2025年3月期第1四半期決算短信[IFRS](連結) |
| 08/06 | 3,700 | 4,080 | 3,469 | 3,627 | +2.95% | 2,931,900 | 7284億6051万 | -15.61% |
| 08/05 | 3,533 | 3,632 | 3,362 | 3,523 | -7.56% | 1,850,400 | 7075億7276万 | -18.64% |
| 08/02 | 3,991 | 4,030 | 3,760 | 3,811 | -9.73% | 2,261,300 | 7654億1577万 | -12.71% |
| 08/01 | （IR情報）15:00 大阪石油化学株式会社エチレンプラント生産再開の延期について |
| 08/01 | 4,329 | 4,329 | 4,153 | 4,222 | -3.54% | 689,400 | 8479億6258万 | -3.83% |
| 07/31 | 4,292 | 4,401 | 4,290 | 4,377 | +1.04% | 561,900 | 8790億9337万 | -0.43% |
| 07/30 | 4,350 | 4,353 | 4,300 | 4,332 | +0.37% | 467,700 | 8700億5540万 | -1.43% |
| 07/29 | 4,275 | 4,340 | 4,237 | 4,316 | +2.37% | 517,300 | 8668億4190万 | -1.8% |
| 07/26 | 4,243 | 4,257 | 4,190 | 4,216 | -0.61% | 852,300 | 8467億5752万 | -4.05% |
| 07/25 | 4,291 | 4,303 | 4,230 | 4,242 | -2.37% | 778,100 | 8519億7946万 | -3.48% |
| 07/24 | （IR情報）16:00 譲渡制限付株式報酬としての自己株式の処分の払込完了に関するお知らせ |
| 07/24 | 4,455 | 4,484 | 4,338 | 4,345 | -2.86% | 478,800 | 8726億6637万 | -1.23% |
| 07/23 | 4,489 | 4,503 | 4,448 | 4,473 | +0.45% | 468,000 | 8983億7438万 | +1.61% |
| 07/22 | 4,473 | 4,489 | 4,409 | 4,453 | -0.8% | 512,300 | 8943億5750万 | +1.27% |
| 07/19 | 4,490 | 4,490 | 4,420 | 4,489 | -0.49% | 803,300 | 9015億8788万 | +2.19% |
| 07/18 | 4,528 | 4,579 | 4,498 | 4,511 | -0.59% | 1,125,300 | 9060億644万 | +2.83% |
| 07/17 | 4,400 | 4,555 | 4,386 | 4,538 | +3.56% | 1,023,300 | 9114億2923万 | +3.49% |
| 07/16 | 4,357 | 4,386 | 4,322 | 4,382 | -0.11% | 804,900 | 8800億9759万 | -0.07% |
| 07/12 | 4,380 | 4,395 | 4,331 | 4,387 | -0.84% | 882,100 | 8811億181万 | -0.23% |
| 07/11 | 4,405 | 4,438 | 4,373 | 4,424 | +1.44% | 744,600 | 8885億3303万 | +0.34% |
| 07/10 | 4,372 | 4,372 | 4,322 | 4,361 | -0.23% | 849,000 | 8758億7987万 | -1.31% |
| 07/09 | 4,339 | 4,400 | 4,321 | 4,371 | +1.42% | 972,200 | 8778億8831万 | -1.42% |
| 07/08 | 4,335 | 4,350 | 4,306 | 4,310 | -1.71% | 999,800 | 8656億3684万 | -3.15% |
| 07/05 | 4,485 | 4,512 | 4,362 | 4,385 | -2.21% | 1,139,000 | 8807億12万 | -1.86% |
| 07/04 | 4,512 | 4,514 | 4,472 | 4,484 | +0.34% | 841,600 | 9005億8366万 | +0.02% |
| 07/03 | 4,424 | 4,469 | 4,397 | 4,469 | +1.48% | 731,100 | 8975億7100万 | -0.47% |
| 07/02 | 4,400 | 4,410 | 4,345 | 4,404 | -0.29% | 802,300 | 8845億1616万 | -2.07% |
| 07/01 | 4,470 | 4,502 | 4,345 | 4,417 | -0.52% | 891,800 | 8871億2713万 | -2.11% |
| 06/28 | 4,410 | 4,456 | 4,407 | 4,440 | +0.77% | 756,000 | 8917億4653万 | -1.86% |
| 06/27 | 4,361 | 4,412 | 4,345 | 4,406 | +1.15% | 821,700 | 8849億1784万 | -2.76% |
| 06/26 | 4,352 | 4,365 | 4,316 | 4,356 | -0.43% | 981,300 | 8748億7565万 | -4.01% |
| 06/25 | （IR情報）16:30 譲渡制限付株式報酬としての自己株式の処分に関するお知らせ |
| 06/25 | 4,375 | 4,392 | 4,342 | 4,375 | +1.41% | 694,700 | 8786億9169万 | -3.74% |
| 06/24 | 4,310 | 4,359 | 4,301 | 4,314 | +0.61% | 655,300 | 8664億4021万 | -5.25% |
| 06/21 | 4,307 | 4,320 | 4,277 | 4,288 | +0.59% | 970,600 | 8612億1827万 | -6.09% |
| 06/20 | 4,319 | 4,338 | 4,216 | 4,263 | -1.3% | 871,000 | 8561億9718万 | -6.78% |
| 06/19 | 4,460 | 4,473 | 4,289 | 4,319 | -2.75% | 910,600 | 8674億4443万 | -5.76% |
| 06/18 | 4,396 | 4,452 | 4,352 | 4,441 | +2.4% | 756,600 | 8919億4738万 | -3.44% |
| 06/17 | 4,360 | 4,374 | 4,277 | 4,337 | -0.23% | 769,900 | 8710億5962万 | -5.72% |
