| 2026 |
| 03/06 | 1,813 | 1,826 | 1,793 | 1,823 | -1.03% | 396,200 | 1968億8400万 | -0.33% |
| 03/05 | (IR情報)17:00 2025年12月期 決算説明会 書き起こし記事公開のお知らせ |
| 03/05 | 1,836 | 1,862 | 1,826 | 1,842 | +2.91% | 272,800 | 1989億3600万 | +0.88% |
| 03/04 | 1,814 | 1,844 | 1,768 | 1,790 | -4.58% | 384,100 | 1933億2000万 | -1.76% |
| 03/03 | 1,899 | 1,912 | 1,864 | 1,876 | -1.78% | 310,500 | 2026億800万 | +3.02% |
| 03/02 | (IR情報)15:30 自己株式の取得状況に関するお知らせ |
| 03/02 | 1,898 | 1,915 | 1,870 | 1,910 | -0.68% | 316,700 | 2062億8000万 | +5.06% |
| 02/27 | (IR情報)10:00 3DC社への出資のお知らせ |
| 02/27 | 1,862 | 1,923 | 1,854 | 1,923 | +3.39% | 536,700 | 2076億8400万 | +6.13% |
| 02/26 | 1,872 | 1,887 | 1,857 | 1,860 | -0.64% | 296,000 | 2008億8000万 | +3.05% |
| 02/25 | 1,872 | 1,884 | 1,840 | 1,872 | +0.81% | 368,600 | 2021億7600万 | +3.94% |
| 02/24 | 1,831 | 1,859 | 1,809 | 1,857 | +1.36% | 350,500 | 2005億5600万 | +3.34% |
| 02/20 | 1,849 | 1,855 | 1,823 | 1,832 | -0.65% | 316,300 | 1978億5600万 | +2.18% |
| 02/19 | (IR情報)12:30 2026-2028年東亞合成グループ中期経営計画「Connect and Create 2028(共創で未来を拓く)」説明資料 |
| 02/19 | (IR情報)12:30 2025年12月期決算説明会資料 |
| 02/19 | 1,825 | 1,904 | 1,814 | 1,844 | +2.22% | 512,100 | 1991億5200万 | +3.02% |
| 02/18 | 1,805 | 1,814 | 1,793 | 1,804 | +1.12% | 279,200 | 1948億3200万 | +1.01% |
| 02/17 | 1,790 | 1,804 | 1,772 | 1,784 | -0.22% | 268,000 | 1926億7200万 | +0.11% |
| 02/16 | 1,800 | 1,802 | 1,773 | 1,788 | 0% | 375,700 | 1931億400万 | +0.51% |
| 02/13 | (IR情報)10:30 自己株式立会外買付取引(ToSTNeT-3)による自己株式の取得結果に関するお知らせ |
| 02/13 | 1,833 | 1,839 | 1,768 | 1,788 | -2.35% | 543,700 | 1931億400万 | +0.73% |
| 02/12 | (IR情報)16:45 自己株式立会外買付取引(ToSTNeT-3)による自己株式の買付に関するお知らせ |
| 02/12 | (IR情報)15:30 従業員向け株式報酬制度の継続に伴う自己株式の処分に関するお知らせ |
| 02/12 | (IR情報)15:30 従業員向け株式報酬制度における株式取得に係る事項の決定に関するお知らせ |
| 02/12 | (IR情報)14:00 2026-2028年東亞合成グループ中期経営計画「Connect and Create 2028(共創で未来を拓く)」 |
| 02/12 | (IR情報)14:00 2025年12月期決算短信〔日本基準〕(連結) |
| 02/12 | (IR情報)14:00 自己株式取得に係る事項の決定に関するお知らせ |
| 02/12 | 1,875 | 1,911 | 1,766 | 1,831 | -2.5% | 615,900 | 1977億4800万 | +3.39% |
| 02/10 | 1,880 | 1,892 | 1,872 | 1,878 | +0.64% | 228,500 | 2028億2400万 | +6.4% |
| 02/09 | 1,881 | 1,881 | 1,853 | 1,866 | +1.19% | 179,000 | 2015億2800万 | +6.26% |
| 02/06 | 1,830 | 1,850 | 1,818 | 1,844 | +0.77% | 139,300 | 1991億5200万 | +5.55% |
| 02/05 | 1,850 | 1,852 | 1,830 | 1,830 | +0.33% | 163,000 | 1976億4000万 | +5.29% |
| 02/04 | 1,806 | 1,832 | 1,805 | 1,824 | +1.11% | 201,900 | 1969億9200万 | +5.31% |
| 02/03 | 1,767 | 1,804 | 1,763 | 1,804 | +2.5% | 173,900 | 1948億3200万 | +4.58% |
| 02/02 | 1,770 | 1,784 | 1,758 | 1,760 | +0.23% | 226,500 | 1900億8000万 | +2.39% |
| 01/30 | 1,755 | 1,763 | 1,740 | 1,756 | +0.57% | 266,500 | 1896億4800万 | +2.45% |
| 01/29 | 1,730 | 1,747 | 1,714 | 1,746 | +0.92% | 560,400 | 1885億6800万 | +2.11% |
| 01/28 | 1,740 | 1,742 | 1,726 | 1,730 | -1.93% | 259,700 | 1868億4000万 | +1.47% |
| 01/27 | 1,751 | 1,764 | 1,736 | 1,764 | +0.28% | 232,400 | 1905億1200万 | +3.7% |
| 01/26 | 1,750 | 1,770 | 1,740 | 1,759 | -1.4% | 201,400 | 1899億7200万 | +3.84% |
| 01/23 | 1,778 | 1,787 | 1,772 | 1,784 | +0.45% | 231,700 | 1926億7200万 | +5.69% |
| 01/22 | 1,756 | 1,783 | 1,749 | 1,776 | +1.54% | 236,200 | 1918億800万 | +5.59% |
| 01/21 | 1,726 | 1,749 | 1,718 | 1,749 | +0.23% | 277,000 | 1888億9200万 | +4.36% |
| 01/20 | 1,762 | 1,770 | 1,745 | 1,745 | -1.47% | 238,400 | 1884億6000万 | +4.49% |
| 01/19 | 1,765 | 1,772 | 1,740 | 1,771 | +0.06% | 234,600 | 1912億6800万 | +6.43% |
| 01/16 | 1,744 | 1,772 | 1,735 | 1,770 | +1.14% | 224,700 | 1911億6000万 | +6.76% |
| 01/15 | 1,740 | 1,753 | 1,736 | 1,750 | +0.52% | 414,800 | 1890億 | +6% |
| 01/15 | (空売り報告)Barclays Bank PLC 438,000株(0.4%)-0.19%義務消失 |
| 01/14 | 1,729 | 1,749 | 1,725 | 1,741 | +1.1% | 296,900 | 1880億2800万 | +5.84% |
| 01/13 | 1,723 | 1,732 | 1,704 | 1,722 | +1.53% | 301,600 | 1859億7600万 | +5.06% |
| 01/09 | (自社株買い)取締役会(2025年2月13日)での決議状況(取得期間2025年2月14日~2025年12月31日) |
| 01/09 | 1,699 | 1,707 | 1,690 | 1,696 | +0.41% | 209,300 | 1831億6800万 | +3.79% |
| 01/09 | (空売り報告)Barclays Bank PLC 639,900株(0.59%)-0.08% |
| 01/08 | 1,687 | 1,694 | 1,676 | 1,689 | +0.12% | 235,800 | 1824億1200万 | +3.62% |
| 01/08 | (空売り報告)Barclays Bank PLC 730,400株(0.67%)-0.08% |
| 01/07 | 1,674 | 1,693 | 1,665 | 1,687 | +0.84% | 265,500 | 1821億9600万 | +3.62% |
| 01/07 | (空売り報告)Barclays Bank PLC 811,100株(0.75%)-0.15% |
| 01/06 | 1,662 | 1,673 | 1,652 | 1,673 | +0.78% | 309,400 | 1806億8400万 | +2.95% |
| 01/06 | (空売り報告)Barclays Bank PLC 978,500株(0.9%)-0.23% |
| 01/05 | 1,645 | 1,660 | 1,640 | 1,660 | +1.1% | 354,100 | 1792億8000万 | +2.28% |
| 01/05 | (空売り報告)Barclays Bank PLC 1,223,000株(1.13%)-0.12% |
| 2025 |
| 12/30 | 1,640 | 1,650 | 1,634 | 1,642 | +0.49% | 350,700 | 1855億4600万 | +1.36% |
| 12/29 | 1,621 | 1,641 | 1,619 | 1,634 | -1.51% | 537,200 | 1846億4200万 | +0.99% |
| 12/26 | 1,656 | 1,661 | 1,653 | 1,659 | +0.36% | 575,100 | 1874億6700万 | +2.66% |
| 12/25 | 1,662 | 1,663 | 1,650 | 1,653 | +0.36% | 221,000 | 1867億8900万 | +2.61% |
| 12/24 | 1,656 | 1,663 | 1,647 | 1,647 | -0.54% | 266,400 | 1861億1100万 | +2.55% |
| 12/24 | (空売り報告)Barclays Bank PLC 1,420,900株(1.25%)+0.21% |
| 12/23 | 1,643 | 1,661 | 1,641 | 1,656 | +0.85% | 235,000 | 1871億2800万 | +3.44% |
| 12/22 | 1,641 | 1,655 | 1,630 | 1,642 | +0.92% | 365,000 | 1855億4600万 | +2.75% |
| 12/22 | (空売り報告)Barclays Bank PLC 1,182,100株(1.04%)+0.22% |
| 12/19 | 1,634 | 1,635 | 1,623 | 1,627 | +0.43% | 418,700 | 1838億5100万 | +2.07% |
| 12/18 | (IR情報)16:00 自己株式の消却に関するお知らせ |
| 12/18 | 1,614 | 1,624 | 1,609 | 1,620 | +0.81% | 219,700 | 1830億6000万 | +1.76% |
| 12/17 | 1,604 | 1,611 | 1,598 | 1,607 | +0.25% | 208,300 | 1815億9100万 | +1.07% |
| 12/17 | (空売り報告)Barclays Bank PLC 926,600株(0.82%)+0.18% |
| 12/16 | 1,630 | 1,630 | 1,602 | 1,603 | -1.54% | 271,900 | 1811億3900万 | +0.94% |
| 12/15 | 1,620 | 1,629 | 1,616 | 1,628 | +0.56% | 264,000 | 1839億6400万 | +2.58% |
| 12/12 | 1,615 | 1,621 | 1,607 | 1,619 | +1.19% | 245,500 | 1829億4700万 | +2.27% |
| 12/11 | 1,619 | 1,628 | 1,600 | 1,600 | -0.5% | 236,300 | 1808億 | +1.33% |
| 12/10 | (自社株買い)取締役会(2025年2月13日)での決議状況(取得期間2025年2月14日~2025年12月31日) |
| 12/10 | 1,618 | 1,618 | 1,608 | 1,608 | +0.12% | 209,100 | 1817億400万 | +2.1% |
| 12/09 | 1,601 | 1,608 | 1,599 | 1,606 | +0.31% | 301,800 | 1814億7800万 | +2.23% |
| 12/08 | 1,607 | 1,608 | 1,600 | 1,601 | +0.38% | 212,300 | 1809億1300万 | +2.1% |
| 12/05 | 1,594 | 1,600 | 1,586 | 1,595 | -0.62% | 314,900 | 1802億3500万 | +1.85% |
| 12/05 | (空売り報告)Barclays Bank PLC 726,000株(0.64%)+0.08% |
| 12/04 | 1,591 | 1,605 | 1,591 | 1,605 | +0.88% | 207,600 | 1813億6500万 | +2.62% |
| 12/04 | (空売り報告)Barclays Bank PLC 636,300株(0.56%)再IN |
| 12/03 | 1,610 | 1,613 | 1,589 | 1,591 | -1.06% | 325,100 | 1797億8300万 | +1.86% |
| 12/02 | 1,620 | 1,620 | 1,606 | 1,608 | -0.74% | 219,400 | 1817億400万 | +2.94% |
| 12/01 | 1,636 | 1,636 | 1,620 | 1,620 | -0.74% | 245,600 | 1830億6000万 | +3.85% |
| 11/28 | 1,629 | 1,637 | 1,619 | 1,632 | +1.12% | 211,100 | 1844億1600万 | +4.82% |
| 11/27 | 1,611 | 1,624 | 1,608 | 1,614 | +1.57% | 250,600 | 1823億8200万 | +3.99% |
| 11/26 | 1,586 | 1,603 | 1,585 | 1,589 | +0.19% | 271,400 | 1795億5700万 | +2.65% |
| 11/25 | 1,580 | 1,586 | 1,576 | 1,586 | +0.83% | 250,200 | 1792億1800万 | +2.65% |
| 11/21 | 1,546 | 1,573 | 1,544 | 1,573 | +1.88% | 218,800 | 1777億4900万 | +1.94% |
| 11/20 | 1,538 | 1,554 | 1,537 | 1,544 | +1.18% | 171,600 | 1744億7200万 | +0.19% |
| 11/19 | (IR情報)16:00 組織変更および役員の異動に関するお知らせ |
| 11/19 | 1,536 | 1,542 | 1,524 | 1,526 | -0.65% | 265,900 | 1724億3800万 | -0.84% |
| 11/18 | 1,550 | 1,553 | 1,536 | 1,536 | -1.41% | 163,400 | 1735億6800万 | -0.07% |
| 11/17 | (IR情報)14:00 中国華南地区子会社再編のお知らせ |
| 11/17 | 1,561 | 1,565 | 1,555 | 1,558 | -0.38% | 135,800 | 1760億5400万 | +1.5% |
| 11/14 | 1,565 | 1,576 | 1,560 | 1,564 | -0.7% | 181,400 | 1767億3200万 | +1.89% |
| 11/13 | 1,572 | 1,582 | 1,570 | 1,575 | +0.13% | 131,000 | 1779億7500万 | +2.74% |
| 11/12 | 1,560 | 1,577 | 1,553 | 1,573 | +1.35% | 181,100 | 1777億4900万 | +2.74% |
| 11/11 | (IR情報)16:00 (訂正)「2025年12月期第3四半期決算説明資料」の一部訂正について |
| 11/11 | 1,563 | 1,563 | 1,543 | 1,552 | -0.77% | 152,900 | 1753億7600万 | +1.5% |
| 11/10 | (IR情報)16:30 2025年12月期第3四半期決算説明資料 |
| 11/10 | (自社株買い)取締役会(2025年2月13日)での決議状況(取得期間2025年2月14日~2025年12月31日) |
| 11/10 | 1,547 | 1,565 | 1,540 | 1,564 | +1.82% | 281,900 | 1767億3200万 | +2.49% |
| 11/07 | 1,516 | 1,536 | 1,514 | 1,536 | +1.45% | 232,900 | 1735億6800万 | +0.85% |
| 11/06 | 1,517 | 1,532 | 1,513 | 1,514 | +0.13% | 338,700 | 1710億8200万 | -0.46% |
| 11/05 | 1,506 | 1,512 | 1,487 | 1,512 | +0.13% | 534,300 | 1708億5600万 | -0.59% |
| 11/04 | 1,530 | 1,532 | 1,509 | 1,510 | -1.31% | 610,700 | 1706億3000万 | -0.79% |
| 10/31 | (IR情報)14:00 2025年12月期第3四半期決算短信〔日本基準〕(連結) |
| 10/31 | 1,558 | 1,558 | 1,520 | 1,530 | -1.16% | 346,400 | 1728億9000万 | +0.46% |
| 10/30 | 1,538 | 1,552 | 1,536 | 1,548 | +0.58% | 267,800 | 1749億2400万 | +1.57% |
| 10/29 | 1,561 | 1,564 | 1,538 | 1,539 | -0.71% | 297,400 | 1739億700万 | +0.98% |
| 10/28 | 1,600 | 1,600 | 1,542 | 1,550 | -3.25% | 586,200 | 1751億5000万 | +1.71% |
| 10/27 | (IR情報)14:00 株主優待制度の導入に関するお知らせ |
| 10/27 | 1,555 | 1,610 | 1,547 | 1,602 | +3.76% | 576,200 | 1810億2600万 | +5.12% |
| 10/24 | 1,544 | 1,553 | 1,540 | 1,544 | +0.13% | 228,200 | 1744億7200万 | +1.45% |
| 10/23 | 1,520 | 1,544 | 1,519 | 1,542 | +1.45% | 155,700 | 1742億4600万 | +1.31% |
| 10/22 | 1,517 | 1,526 | 1,515 | 1,520 | +0.2% | 175,100 | 1717億6000万 | -0.2% |
| 10/21 | 1,519 | 1,529 | 1,516 | 1,517 | 0% | 181,300 | 1714億2100万 | -0.52% |
| 10/20 | 1,537 | 1,537 | 1,517 | 1,517 | -0.33% | 133,000 | 1714億2100万 | -0.59% |
| 10/17 | 1,526 | 1,528 | 1,521 | 1,522 | -0.07% | 201,900 | 1719億8600万 | -0.39% |
| 10/16 | 1,519 | 1,531 | 1,516 | 1,523 | +0.86% | 270,400 | 1720億9900万 | -0.39% |
| 10/15 | 1,494 | 1,516 | 1,488 | 1,510 | +2.37% | 266,800 | 1706億3000万 | -1.37% |
| 10/14 | 1,463 | 1,487 | 1,461 | 1,475 | -1.01% | 267,400 | 1666億7500万 | -3.78% |
| 10/10 | (自社株買い)取締役会(2025年2月13日)での決議状況(取得期間2025年2月14日~2025年12月31日) |
| 10/10 | 1,519 | 1,530 | 1,490 | 1,490 | -2.87% | 214,200 | 1683億7000万 | -2.99% |
| 10/09 | 1,521 | 1,536 | 1,521 | 1,534 | +0.72% | 171,100 | 1733億4200万 | -0.32% |
| 10/08 | 1,533 | 1,547 | 1,522 | 1,523 | -0.46% | 181,500 | 1720億9900万 | -1.04% |
| 10/07 | 1,509 | 1,538 | 1,505 | 1,530 | +1.32% | 214,900 | 1728億9000万 | -0.58% |
| 10/06 | (空売り報告)三菱UFJモルガン・スタンレー証券 558,400株(0.49%)-0.18%義務消失 |
| 10/03 | (空売り報告)JPM Securities Japan Co Ltd. 487,907株(0.43%)-0.26%義務消失 |
| 10/02 | (空売り報告)三菱UFJモルガン・スタンレー証券 758,400株(0.67%)-0.18% |
| 09/30 | (5%ルール)三菱UFJアセットマネジメント(0.99%)三菱UFJモルガン・スタンレー証券(0.06%)三菱UFJ信託銀行(1.19%)三菱UFJ銀行(2%) |