| 2022 |
| 03/29 | （IR情報）15:00 当社株式の上場廃止のお知らせ |
| 03/28 | 1,198 | 1,201 | 1,196 | 1,196 | -0.08% | 115,500 | 282億3346万 | -1.24% |
| 03/25 | 1,197 | 1,201 | 1,197 | 1,197 | 0% | 24,700 | 282億5706万 | -1.16% |
| 03/24 | 1,198 | 1,200 | 1,197 | 1,197 | 0% | 35,600 | 282億5706万 | -1.16% |
| 03/23 | 1,198 | 1,200 | 1,197 | 1,197 | 0% | 23,500 | 282億5706万 | -1.16% |
| 03/22 | 1,197 | 1,205 | 1,197 | 1,197 | 0% | 65,300 | 282億5706万 | -1.16% |
| 03/18 | 1,197 | 1,198 | 1,197 | 1,197 | 0% | 39,200 | 282億5706万 | -1.16% |
| 03/17 | 1,197 | 1,198 | 1,197 | 1,197 | 0% | 33,500 | 282億5706万 | -1.16% |
| 03/16 | 1,197 | 1,199 | 1,197 | 1,197 | 0% | 61,900 | 282億5706万 | -1.16% |
| 03/15 | 1,197 | 1,200 | 1,197 | 1,197 | -0.08% | 52,700 | 282億5706万 | -1.16% |
| 03/14 | 1,197 | 1,201 | 1,197 | 1,198 | +0.08% | 77,400 | 282億8067万 | -1.07% |
| 03/11 | 1,197 | 1,200 | 1,197 | 1,197 | 0% | 20,500 | 282億5706万 | -1.16% |
| 03/10 | 1,197 | 1,199 | 1,197 | 1,197 | 0% | 17,400 | 282億5706万 | -1.16% |
| 03/09 | （5%ルール）品川リフラクトリーズ（99.04%） |
| 03/09 | 1,197 | 1,200 | 1,197 | 1,197 | 0% | 65,500 | 282億5706万 | -1.16% |
| 03/08 | 1,196 | 1,199 | 1,196 | 1,197 | +0.08% | 120,900 | 282億5706万 | -1.16% |
| 03/07 | 1,197 | 1,232 | 1,196 | 1,196 | -0.08% | 411,800 | 282億3346万 | -1.24% |
| 03/04 | 1,197 | 1,201 | 1,197 | 1,197 | +0.08% | 75,400 | 282億5706万 | -1.16% |
| 03/03 | 1,196 | 1,198 | 1,196 | 1,196 | -0.08% | 200,100 | 282億3346万 | -1.24% |
| 03/02 | （IR情報）16:00 品川リフラクトリーズ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 |
| 03/02 | 1,197 | 1,201 | 1,196 | 1,197 | -0.17% | 151,200 | 282億5706万 | -1.16% |
| 03/01 | 1,200 | 1,201 | 1,197 | 1,199 | +0.17% | 38,800 | 283億428万 | -0.99% |
| 02/28 | 1,198 | 1,202 | 1,197 | 1,197 | +0.08% | 105,600 | 282億5706万 | -1.16% |
| 02/25 | 1,201 | 1,203 | 1,196 | 1,196 | -0.17% | 109,900 | 282億3346万 | -1.24% |
| 02/24 | 1,200 | 1,211 | 1,196 | 1,198 | 0% | 72,300 | 282億8067万 | -1.16% |
| 02/22 | 1,260 | 1,260 | 1,198 | 1,198 | -5.37% | 53,900 | 282億8067万 | -1.16% |
| 02/21 | 1,241 | 1,389 | 1,235 | 1,266 | -14.52% | 73,100 | 298億8592万 | +4.46% |
| 02/18 | （5%ルール）品川リフラクトリーズ（91.47%） |
| 02/18 | （IR情報）15:00 支配株主である品川リフラクトリーズ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 |
| 02/18 | 1,196 | 1,492 | 1,196 | 1,481 | +23.93% | 242,500 | 349億6133万 | +22.5% |
| 02/17 | 1,197 | 1,198 | 1,195 | 1,195 | 0% | 36,900 | 282億985万 | -0.17% |
| 02/16 | 1,196 | 1,198 | 1,195 | 1,195 | +0.08% | 65,400 | 282億985万 | -0.17% |
| 02/15 | 1,198 | 1,199 | 1,194 | 1,194 | -0.33% | 157,800 | 281億8624万 | -0.33% |
| 02/14 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 100,100 | 282億8067万 | 0% |
| 02/10 | （5%ルール）イソライト工業（0.23%）品川リフラクトリーズ（54.73%） |
| 02/10 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 50,800 | 282億8067万 | 0% |
| 02/09 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 57,900 | 282億8067万 | 0% |
| 02/08 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 99,100 | 282億8067万 | 0% |
| 02/07 | 1,198 | 1,199 | 1,197 | 1,198 | -0.08% | 132,700 | 282億8067万 | 0% |
| 02/04 | 1,198 | 1,199 | 1,197 | 1,199 | +0.17% | 74,700 | 283億428万 | +0.17% |
| 02/03 | 1,198 | 1,199 | 1,197 | 1,197 | -0.08% | 92,700 | 282億5706万 | 0% |
| 02/02 | （IR情報）15:00 2022年3月期第3四半期決算短信〔日本基準〕(連結) |
| 02/02 | 1,198 | 1,199 | 1,197 | 1,198 | +0.08% | 187,900 | 282億8067万 | +0.08% |
| 02/01 | 1,199 | 1,199 | 1,197 | 1,197 | 0% | 253,700 | 282億5706万 | +0.5% |
| 01/31 | 1,198 | 1,199 | 1,197 | 1,197 | 0% | 121,700 | 282億5706万 | +1.53% |
| 01/28 | 1,198 | 1,199 | 1,197 | 1,197 | -0.08% | 248,100 | 282億5706万 | +2.66% |
| 01/27 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 140,900 | 282億8067万 | +3.99% |
| 01/26 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 57,500 | 282億8067万 | +5.27% |
| 01/25 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 95,100 | 282億8067万 | +6.49% |
| 01/24 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 104,700 | 282億8067万 | +7.64% |
| 01/21 | 1,199 | 1,199 | 1,198 | 1,198 | 0% | 368,700 | 282億8067万 | +8.91% |
| 01/20 | 1,198 | 1,199 | 1,198 | 1,198 | 0% | 86,500 | 282億8067万 | +10.31% |
| 01/19 | 1,198 | 1,199 | 1,197 | 1,198 | -0.08% | 232,300 | 282億8067万 | +11.65% |
| 01/18 | 1,198 | 1,199 | 1,197 | 1,199 | +0.17% | 247,600 | 283億428万 | +13.01% |
| 01/17 | 1,198 | 1,198 | 1,197 | 1,197 | 0% | 148,100 | 282億5706万 | +14.11% |
| 01/14 | 1,197 | 1,198 | 1,197 | 1,197 | 0% | 223,300 | 282億5706万 | +15.32% |
| 01/13 | 1,198 | 1,198 | 1,197 | 1,197 | 0% | 59,900 | 282億5706万 | +16.55% |
| 01/12 | 1,198 | 1,199 | 1,197 | 1,197 | 0% | 162,400 | 282億5706万 | +18.05% |
| 01/11 | 1,197 | 1,198 | 1,197 | 1,197 | 0% | 120,100 | 282億5706万 | +19.46% |
| 01/07 | 1,199 | 1,200 | 1,197 | 1,197 | 0% | 321,400 | 282億5706万 | +21.03% |
| 01/06 | 1,197 | 1,207 | 1,196 | 1,197 | 0% | 802,400 | 282億5706万 | +22.39% |
| 01/05 | 1,197 | 1,199 | 1,196 | 1,197 | 0% | 555,000 | 282億5706万 | +23.78% |
| 01/04 | 1,197 | 1,198 | 1,196 | 1,197 | 0% | 625,700 | 282億5706万 | +25.21% |
| 2021 |
| 12/30 | 1,196 | 1,198 | 1,196 | 1,197 | +0.08% | 353,200 | 282億5706万 | +26.4% |
| 12/29 | 1,196 | 1,198 | 1,196 | 1,196 | 0% | 366,700 | 282億3346万 | +27.23% |
| 12/28 | 1,196 | 1,198 | 1,196 | 1,196 | 0% | 769,500 | 282億3346万 | +28.05% |
| 12/27 | 1,196 | 1,198 | 1,195 | 1,196 | +15.22% | 1,507,300 | 282億3346万 | +28.88% |
| 12/24 | 1,038 | 1,038 | 1,038 | 1,038 | +16.89% | 19,900 | 245億362万 | +13.07% |
| 12/23 | （IR情報）21:00 支配株主である品川リフラクトリーズ株式会社による当社株式に対する公開買付けに関する賛同の意見表明及び応募推奨に関するお知らせ |
| 12/23 | （IR情報）21:00 期末配当予想の修正(無配)に関するお知らせ |
| 12/23 | 885 | 895 | 878 | 888 | +1.6% | 66,400 | 209億6263万 | -2.95% |
| 12/22 | 875 | 889 | 870 | 874 | +0.69% | 77,700 | 206億3214万 | -4.69% |
| 12/21 | 853 | 882 | 853 | 868 | +2.72% | 112,400 | 204億9050万 | -5.45% |
| 12/20 | 869 | 873 | 845 | 845 | -2.87% | 120,100 | 199億4755万 | -8.15% |
| 12/17 | 879 | 880 | 865 | 870 | -1.69% | 65,200 | 205億3771万 | -5.54% |
| 12/16 | 884 | 895 | 869 | 885 | +1.37% | 86,700 | 208億9181万 | -3.8% |
| 12/15 | 850 | 875 | 843 | 873 | +1.99% | 89,300 | 206億853万 | -5.01% |
| 12/14 | 873 | 877 | 854 | 856 | -2.73% | 109,800 | 202億722万 | -6.75% |
| 12/13 | 893 | 899 | 871 | 880 | -0.23% | 89,900 | 207億7378万 | -4.14% |
| 12/10 | 910 | 913 | 881 | 882 | -3.08% | 103,500 | 208億2099万 | -3.82% |
| 12/09 | 937 | 940 | 907 | 910 | -2.26% | 102,500 | 214億8198万 | -0.76% |
| 12/08 | 930 | 940 | 915 | 931 | +2.53% | 167,300 | 219億7771万 | +1.64% |
| 12/07 | 886 | 910 | 874 | 908 | +4.01% | 124,300 | 214億3476万 | -0.87% |
| 12/06 | 879 | 886 | 862 | 873 | -2.02% | 128,200 | 206億853万 | -4.59% |
| 12/03 | 896 | 899 | 870 | 891 | +1.02% | 130,400 | 210億3345万 | -2.73% |
| 12/02 | 903 | 919 | 882 | 882 | -3.08% | 121,500 | 208億2099万 | -3.71% |
| 12/01 | 921 | 922 | 883 | 910 | -1.83% | 190,100 | 214億8198万 | -0.87% |
| 11/30 | 954 | 975 | 924 | 927 | -0.22% | 206,500 | 218億8329万 | +0.98% |
| 11/29 | 946 | 960 | 923 | 929 | -4.82% | 218,200 | 219億3050万 | +1.31% |
| 11/26 | 997 | 1,007 | 964 | 976 | -2.79% | 233,700 | 230億4001万 | +6.55% |
| 11/25 | 1,048 | 1,051 | 982 | 1,004 | -4.47% | 402,900 | 237億99万 | +9.85% |
| 11/24 | 1,065 | 1,087 | 1,009 | 1,051 | +0.57% | 556,300 | 248億1050万 | +15.62% |
| 11/22 | 976 | 1,061 | 976 | 1,045 | +8.74% | 681,500 | 246億6886万 | +15.73% |
| 11/19 | 962 | 973 | 941 | 961 | +0.1% | 186,100 | 226億8591万 | +7.25% |
| 11/18 | 933 | 969 | 927 | 960 | +3.56% | 285,900 | 226億6231万 | +7.74% |
| 11/17 | 910 | 929 | 900 | 927 | +1.76% | 115,600 | 218億8329万 | +4.63% |
| 11/16 | 918 | 920 | 900 | 911 | +0.11% | 124,400 | 215億558万 | +3.17% |
| 11/15 | 887 | 910 | 883 | 910 | +4.36% | 142,600 | 214億8198万 | +3.17% |
| 11/12 | 854 | 876 | 854 | 872 | +2.11% | 68,100 | 205億8493万 | -0.68% |
| 11/11 | 856 | 868 | 849 | 854 | -0.58% | 69,900 | 201億6001万 | -2.4% |
| 11/10 | 847 | 879 | 845 | 859 | +2.87% | 167,900 | 202億7804万 | -1.38% |
| 11/09 | 851 | 858 | 829 | 835 | -2.11% | 89,600 | 197億1148万 | -3.58% |
| 11/08 | 860 | 860 | 841 | 853 | -0.93% | 105,100 | 201億3640万 | -1.16% |
| 11/05 | 886 | 886 | 856 | 861 | -3.04% | 145,600 | 203億2525万 | +0.12% |
| 11/04 | 890 | 900 | 866 | 888 | +0.23% | 162,700 | 209億6263万 | +3.62% |
| 11/02 | （IR情報）14:40 剰余金の配当(中間配当)及び配当予想の修正に関するお知らせ |
| 11/02 | （IR情報）14:40 2022年3月期第2四半期決算短信〔日本基準〕(連結) |
| 11/02 | 915 | 917 | 844 | 886 | -3.28% | 367,300 | 209億1542万 | +3.75% |
| 11/01 | 898 | 919 | 886 | 916 | +3.62% | 144,100 | 216億2362万 | +7.76% |
| 10/29 | 906 | 906 | 877 | 884 | -1.78% | 118,700 | 208億6821万 | +4.62% |
| 10/28 | 905 | 905 | 876 | 900 | -0.88% | 201,200 | 212億4591万 | +6.89% |
