| 2020 |
| 10/27 | （IR情報）15:00 当社株式の上場廃止のお知らせ |
| 10/27 | 1,695 | 1,697 | 1,695 | 1,695 | 0% | 15,200 | 388億9686万 | +0.06% |
| 10/26 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 8,200 | 388億9686万 | 0% |
| 10/23 | 1,695 | 1,696 | 1,695 | 1,695 | -0.06% | 32,800 | 388億9686万 | 0% |
| 10/22 | 1,695 | 1,696 | 1,695 | 1,696 | +0.06% | 11,300 | 389億1981万 | +0.06% |
| 10/21 | 1,696 | 1,696 | 1,695 | 1,695 | 0% | 5,800 | 388億9686万 | 0% |
| 10/20 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 48,400 | 388億9686万 | 0% |
| 10/19 | 1,696 | 1,697 | 1,695 | 1,695 | -0.06% | 6,600 | 388億9686万 | 0% |
| 10/16 | 1,695 | 1,697 | 1,695 | 1,696 | +0.06% | 3,900 | 389億1981万 | +0.06% |
| 10/15 | 1,695 | 1,695 | 1,695 | 1,695 | 0% | 9,900 | 388億9686万 | 0% |
| 10/14 | 1,694 | 1,697 | 1,694 | 1,695 | +0.06% | 8,600 | 388億9686万 | 0% |
| 10/13 | 1,694 | 1,697 | 1,694 | 1,694 | 0% | 13,200 | 388億7391万 | -0.06% |
| 10/12 | 1,694 | 1,697 | 1,694 | 1,694 | 0% | 10,900 | 388億7391万 | -0.06% |
| 10/09 | 1,693 | 1,696 | 1,693 | 1,694 | +0.12% | 20,400 | 388億7391万 | -0.06% |
| 10/08 | （IR情報）14:00 住友ベークライト株式会社による当社株式に係る株式売渡請求を行うことの決定、当該株式売渡請求に係る承認及び当社株式の上場廃止に関するお知らせ |
| 10/08 | 1,696 | 1,697 | 1,692 | 1,692 | -0.24% | 40,900 | 388億2802万 | -0.18% |
| 10/07 | 1,694 | 1,697 | 1,692 | 1,696 | +0.18% | 23,200 | 389億1981万 | +0.06% |
| 10/06 | 1,693 | 1,697 | 1,693 | 1,693 | -0.06% | 17,500 | 388億5096万 | -0.12% |
| 10/05 | 1,692 | 1,696 | 1,692 | 1,694 | +0.12% | 8,200 | 388億7391万 | -0.06% |
| 10/02 | 1,691 | 1,698 | 1,691 | 1,692 | +0.18% | 25,100 | 388億2802万 | -0.18% |
| 10/01 | （IR情報）10:30 住友ベークライト株式会社による当社株式に対する公開買付けの結果に関するお知らせ |
| 10/01 | （IR情報）10:30 親会社及びその他の関係会社の異動に関するお知らせ |
| 09/30 | 1,689 | 1,690 | 1,688 | 1,689 | -0.06% | 14,300 | 387億5917万 | -0.35% |
| 09/29 | 1,696 | 1,696 | 1,690 | 1,690 | -0.35% | 36,300 | 387億8212万 | -0.29% |
| 09/28 | 1,697 | 1,697 | 1,696 | 1,696 | 0% | 70,600 | 389億1981万 | 0% |
| 09/25 | 1,696 | 1,697 | 1,696 | 1,696 | -0.06% | 118,300 | 389億1981万 | 0% |
| 09/24 | 1,696 | 1,698 | 1,696 | 1,697 | +0.06% | 139,900 | 389億4276万 | +0.06% |
| 09/23 | 1,697 | 1,699 | 1,696 | 1,696 | -0.06% | 263,800 | 389億1981万 | +0.06% |
| 09/18 | 1,697 | 1,698 | 1,697 | 1,697 | 0% | 35,400 | 389億4276万 | +0.12% |
| 09/17 | 1,698 | 1,698 | 1,697 | 1,697 | 0% | 36,900 | 389億4276万 | +0.12% |
| 09/16 | 1,697 | 1,698 | 1,697 | 1,697 | 0% | 91,300 | 389億4276万 | +0.12% |
| 09/15 | 1,697 | 1,698 | 1,696 | 1,697 | 0% | 66,800 | 389億4276万 | +0.12% |
| 09/14 | 1,696 | 1,698 | 1,696 | 1,697 | +0.06% | 205,700 | 389億4276万 | +0.12% |
| 09/11 | 1,696 | 1,696 | 1,695 | 1,696 | +0.06% | 83,500 | 389億1981万 | +0.06% |
| 09/10 | 1,696 | 1,696 | 1,695 | 1,695 | 0% | 106,500 | 388億9686万 | 0% |
| 09/09 | 1,696 | 1,697 | 1,695 | 1,695 | 0% | 346,400 | 388億9686万 | 0% |
| 09/08 | 1,696 | 1,696 | 1,695 | 1,695 | 0% | 98,000 | 388億9686万 | +1.44% |
| 09/07 | 1,696 | 1,697 | 1,695 | 1,695 | 0% | 142,700 | 388億9686万 | +3.29% |
| 09/04 | 1,695 | 1,697 | 1,695 | 1,695 | 0% | 198,200 | 388億9686万 | +5.67% |
| 09/03 | 1,696 | 1,697 | 1,695 | 1,695 | 0% | 198,400 | 388億9686万 | +8.1% |
| 09/02 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 236,300 | 388億9686万 | +10.57% |
| 09/01 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 156,000 | 388億9686万 | +13.15% |
| 08/31 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 46,600 | 388億9686万 | +15.86% |
| 08/28 | 1,696 | 1,696 | 1,695 | 1,695 | 0% | 84,100 | 388億9686万 | +18.7% |
| 08/27 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 144,500 | 388億9686万 | +21.59% |
| 08/26 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 97,600 | 388億9686万 | +24.63% |
| 08/25 | 1,695 | 1,696 | 1,695 | 1,695 | 0% | 97,100 | 388億9686万 | +27.92% |
| 08/24 | 1,696 | 1,698 | 1,695 | 1,695 | 0% | 512,500 | 388億9686万 | +31.29% |
| 08/21 | 1,695 | 1,697 | 1,695 | 1,695 | 0% | 184,600 | 388億9686万 | +34.95% |
| 08/20 | 1,696 | 1,697 | 1,695 | 1,695 | 0% | 425,300 | 388億9686万 | +38.71% |
| 08/19 | 1,696 | 1,696 | 1,695 | 1,695 | 0% | 75,500 | 388億9686万 | +42.8% |
| 08/18 | 1,696 | 1,697 | 1,695 | 1,695 | -0.06% | 320,400 | 388億9686万 | +47.01% |
| 08/17 | 1,696 | 1,697 | 1,696 | 1,696 | 0% | 400,800 | 389億1981万 | +51.43% |
| 08/14 | 1,696 | 1,697 | 1,696 | 1,696 | 0% | 143,300 | 389億1981万 | +56.03% |
| 08/13 | 1,696 | 1,697 | 1,696 | 1,696 | 0% | 505,000 | 389億1981万 | +60.91% |
| 08/12 | 1,697 | 1,697 | 1,696 | 1,696 | 0% | 140,100 | 389億1981万 | +66.27% |
| 08/11 | 1,696 | 1,697 | 1,696 | 1,696 | 0% | 506,900 | 389億1981万 | +71.83% |
| 08/07 | 1,696 | 1,697 | 1,696 | 1,696 | -0.06% | 248,300 | 389億1981万 | +77.96% |
| 08/06 | 1,697 | 1,698 | 1,696 | 1,697 | 0% | 719,600 | 389億4276万 | +84.46% |
| 08/05 | 1,697 | 1,701 | 1,696 | 1,697 | +56.55% | 1,687,300 | 389億4276万 | +91.53% |
| 08/04 | 1,084 | 1,084 | 1,084 | 1,084 | +16.06% | 14,800 | 248億7563万 | +27.08% |
| 08/03 | 934 | 934 | 934 | 934 | +19.13% | 5,100 | 214億3343万 | +10.66% |
| 07/31 | （IR情報）15:00 2021年3月期第1四半期決算短信〔日本基準〕(連結) |
| 07/31 | （IR情報）15:00 住友ベークライト株式会社による当社株式に対する公開買付けに関する意見表明のお知らせ |
| 07/31 | （IR情報）15:00 剰余金の配当(中間配当無配)に関するお知らせ |
| 07/31 | 813 | 813 | 777 | 784 | -2.61% | 56,000 | 179億9123万 | -6.89% |
| 07/30 | 811 | 819 | 805 | 805 | -0.37% | 33,900 | 184億7314万 | -4.85% |
| 07/29 | 816 | 819 | 804 | 808 | -0.98% | 28,000 | 185億4198万 | -4.83% |
| 07/28 | 822 | 822 | 813 | 816 | -0.73% | 24,200 | 187億2557万 | -4.23% |
| 07/27 | 821 | 825 | 821 | 822 | -0.84% | 15,700 | 188億6325万 | -3.75% |
| 07/22 | 844 | 844 | 828 | 829 | -1.89% | 19,500 | 190億2389万 | -3.15% |
| 07/21 | 831 | 845 | 825 | 845 | +1.93% | 34,600 | 193億9106万 | -1.52% |
| 07/20 | 833 | 834 | 826 | 829 | +0.12% | 14,000 | 190億2389万 | -3.49% |
| 07/17 | 831 | 835 | 826 | 828 | -0.72% | 22,800 | 190億94万 | -3.83% |
| 07/16 | 839 | 842 | 832 | 834 | -0.48% | 23,700 | 191億3863万 | -3.25% |
| 07/15 | 833 | 840 | 832 | 838 | +0.84% | 16,700 | 192億3042万 | -3.01% |
| 07/14 | 836 | 840 | 828 | 831 | -0.95% | 24,700 | 190億6979万 | -4.04% |
| 07/13 | 850 | 855 | 836 | 839 | -0.47% | 21,400 | 192億5337万 | -3.34% |
| 07/10 | （IR情報）15:00 役員人事に関するお知らせ |
| 07/10 | 850 | 856 | 838 | 843 | -1.75% | 34,300 | 193億4516万 | -3.1% |
| 07/09 | 875 | 876 | 858 | 858 | -1.94% | 16,000 | 196億8938万 | -1.49% |
| 07/08 | 866 | 880 | 854 | 875 | +0.81% | 41,300 | 200億7950万 | +0.46% |
| 07/07 | 855 | 869 | 855 | 868 | +1.17% | 55,200 | 199億1886万 | -0.34% |
| 07/06 | 858 | 863 | 847 | 858 | +0.94% | 33,500 | 196億8938万 | -1.61% |
| 07/03 | 849 | 853 | 839 | 850 | +0.12% | 18,800 | 195億580万 | -2.52% |
| 07/02 | 867 | 867 | 832 | 849 | -2.08% | 81,600 | 194億8285万 | -2.64% |
| 07/01 | 861 | 867 | 858 | 867 | +0.23% | 24,500 | 198億9591万 | -0.69% |
| 06/30 | 860 | 868 | 859 | 865 | +0.82% | 10,700 | 198億5002万 | -0.92% |
| 06/29 | 865 | 866 | 858 | 858 | -1.49% | 17,000 | 196億8938万 | -1.72% |
| 06/26 | 871 | 873 | 866 | 871 | -0.11% | 24,200 | 199億8771万 | -0.23% |
| 06/25 | 882 | 882 | 867 | 872 | -1.36% | 17,100 | 200億1065万 | -0.11% |
| 06/24 | 875 | 884 | 870 | 884 | +0.57% | 30,000 | 202億8603万 | +1.14% |
| 06/23 | 882 | 883 | 873 | 879 | -0.57% | 7,600 | 201億7129万 | +0.69% |
| 06/22 | 875 | 886 | 871 | 884 | +1.03% | 26,200 | 202億8603万 | +1.26% |
| 06/19 | （IR情報）16:00 (訂正)支配株主等に関する事項について |
| 06/19 | 873 | 876 | 864 | 875 | +0.23% | 18,300 | 200億7950万 | +0.11% |
| 06/18 | 872 | 879 | 860 | 873 | +0.11% | 22,800 | 200億3360万 | -0.23% |
| 06/17 | 883 | 883 | 871 | 872 | -1.25% | 9,400 | 200億1065万 | -0.34% |
| 06/16 | 864 | 885 | 864 | 883 | +2.2% | 29,400 | 202億6308万 | +1.03% |
| 06/15 | 860 | 878 | 860 | 864 | +0.12% | 34,800 | 198億2707万 | -1.14% |
| 06/12 | 853 | 870 | 841 | 863 | -0.8% | 57,000 | 198億412万 | -1.15% |
| 06/11 | 888 | 888 | 868 | 870 | -2.36% | 22,400 | 199億6476万 | -0.34% |
| 06/10 | 882 | 895 | 881 | 891 | +1.25% | 20,500 | 204億4667万 | +2.06% |
| 06/09 | 892 | 892 | 879 | 880 | -1.12% | 23,300 | 201億9424万 | +0.69% |
| 06/08 | （IR情報）13:00 支配株主等に関する事項について |
| 06/08 | 881 | 905 | 879 | 890 | +1.25% | 46,300 | 204億2372万 | +1.71% |
| 06/05 | 869 | 882 | 865 | 879 | +1.74% | 18,400 | 201億7129万 | +0.23% |
| 06/04 | 878 | 878 | 862 | 864 | -1.37% | 27,900 | 198億2707万 | -1.71% |
| 06/03 | 900 | 904 | 871 | 876 | -1.24% | 48,500 | 201億245万 | -0.57% |
| 06/02 | 861 | 894 | 861 | 887 | +3.26% | 65,200 | 203億5487万 | +0.45% |
