| 2022 |
| 03/07 | 877 | 877 | 838 | 841 | -4.32% | 127,500 | 273億9万 | -4.54% |
| 03/04 | 883 | 891 | 879 | 879 | +0.23% | 70,500 | 285億3362万 | -0.45% |
| 03/03 | 881 | 891 | 877 | 877 | +0.69% | 61,500 | 284億6870万 | -0.79% |
| 03/02 | 880 | 884 | 871 | 871 | -2.13% | 83,000 | 282億7393万 | -1.58% |
| 03/01 | 883 | 900 | 880 | 890 | +1.37% | 96,500 | 288億9070万 | +0.34% |
| 02/28 | 884 | 887 | 876 | 878 | +0.11% | 56,500 | 285億116万 | -1.24% |
| 02/25 | 860 | 882 | 856 | 877 | +2.57% | 85,000 | 284億6870万 | -1.57% |
| 02/24 | 860 | 860 | 847 | 855 | -0.93% | 84,500 | 277億5455万 | -4.47% |
| 02/22 | 883 | 883 | 861 | 863 | -2.27% | 117,000 | 280億1424万 | -4.22% |
| 02/21 | 899 | 900 | 880 | 883 | -0.23% | 49,000 | 286億6347万 | -2.65% |
| 02/18 | 893 | 893 | 883 | 885 | -0.9% | 49,000 | 287億2839万 | -2.96% |
| 02/17 | 886 | 899 | 886 | 893 | +0.68% | 98,000 | 289億8808万 | -2.62% |
| 02/16 | 888 | 889 | 884 | 887 | +0.45% | 46,500 | 287億9331万 | -3.9% |
| 02/15 | 879 | 883 | 878 | 883 | +0.57% | 69,500 | 286億6347万 | -4.85% |
| 02/14 | 887 | 888 | 877 | 878 | -1.13% | 95,000 | 285億116万 | -6% |
| 02/10 | 888 | 892 | 885 | 888 | +0.34% | 168,000 | 288億2578万 | -5.43% |
| 02/09 | 899 | 899 | 884 | 885 | -0.9% | 192,500 | 287億2839万 | -6.25% |
| 02/08 | 899 | 900 | 890 | 893 | -0.33% | 96,500 | 289億8808万 | -5.8% |
| 02/07 | （5%ルール）みずほ証券（0.14%）アセットマネジメントOne（0.73%）みずほ銀行（2.09%） |
| 02/07 | 898 | 900 | 890 | 896 | -0.22% | 65,500 | 290億8547万 | -5.88% |
| 02/04 | （5%ルール）野村證券（0.01%）野村アセットマネジメント（1.58%）ノムラセキュリテーズインターナショナル(NOMURA …（0.02%）ノムラインターナショナルピーエルシー(NOMURA IN…（0.92%） |
| 02/04 | 890 | 898 | 884 | 898 | +1.13% | 104,500 | 291億5039万 | -6.07% |
| 02/03 | 904 | 904 | 880 | 888 | -0.22% | 94,000 | 288億2578万 | -7.4% |
| 02/02 | 878 | 895 | 871 | 890 | +2.06% | 115,500 | 288億9070万 | -7.58% |
| 02/01 | 904 | 911 | 867 | 872 | -2.57% | 193,500 | 283億639万 | -9.73% |
| 01/31 | 885 | 899 | 870 | 895 | +1.13% | 186,000 | 290億5301万 | -7.73% |
| 01/28 | （IR情報）15:40 2022年3月期第3四半期決算短信〔日本基準〕(連結) |
| 01/28 | 891 | 891 | 877 | 885 | +0.8% | 86,500 | 287億2839万 | -8.95% |
| 01/27 | 906 | 909 | 876 | 878 | -2.98% | 115,500 | 285億116万 | -9.95% |
| 01/26 | 916 | 920 | 905 | 905 | -1.2% | 79,500 | 293億7762万 | -7.46% |
| 01/25 | 933 | 933 | 907 | 916 | -0.87% | 145,500 | 297億3470万 | -6.53% |
| 01/24 | 915 | 928 | 915 | 924 | +0.22% | 88,000 | 299億9439万 | -5.91% |
| 01/21 | （5%ルール）ノムラセキュリテーズインターナショナル(NOMURA …（0%）ノムラインターナショナルピーエルシー(NOMURA IN…（3.92%）野村アセットマネジメント（1.42%）野村證券（0.16%） |
| 01/21 | 925 | 932 | 916 | 922 | -0.86% | 106,500 | 299億2947万 | -6.21% |
| 01/20 | 945 | 970 | 918 | 930 | -5.78% | 466,000 | 301億8916万 | -5.58% |
| 01/19 | （5%ルール）大同特殊鋼（48.02%）大同興業（0.16%） |
| 01/19 | （IR情報）15:00 当社親会社である大同特殊鋼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 |
| 01/19 | 980 | 992 | 975 | 987 | -2.28% | 123,500 | 320億3946万 | +0.1% |
| 01/18 | 1,016 | 1,016 | 1,004 | 1,010 | 0% | 49,000 | 327億8607万 | +2.54% |
| 01/17 | 1,000 | 1,014 | 994 | 1,010 | +0.2% | 73,000 | 327億8607万 | +2.75% |
| 01/14 | 1,016 | 1,016 | 999 | 1,008 | -0.2% | 59,000 | 327億2115万 | +2.86% |
| 01/13 | 1,022 | 1,034 | 1,010 | 1,010 | -1.94% | 103,500 | 327億8607万 | +3.27% |
| 01/12 | 1,036 | 1,036 | 1,020 | 1,030 | 0% | 92,000 | 334億3530万 | +5.53% |
| 01/11 | 1,030 | 1,038 | 1,022 | 1,030 | +1.18% | 130,500 | 334億3530万 | +5.75% |
| 01/07 | 1,018 | 1,024 | 1,004 | 1,018 | +0.79% | 121,500 | 330億4577万 | +4.84% |
| 01/06 | 1,000 | 1,018 | 1,000 | 1,010 | -0.59% | 80,500 | 327億8607万 | +4.02% |
| 01/05 | 994 | 1,016 | 988 | 1,016 | +2.83% | 162,000 | 329億8084万 | +5.28% |
| 01/04 | 1,000 | 1,004 | 975 | 988 | -0.6% | 117,500 | 320億7192万 | +2.92% |
| 2021 |
| 12/30 | 984 | 1,004 | 984 | 994 | +1.02% | 47,000 | 322億6669万 | +3.97% |
| 12/29 | 982 | 988 | 976 | 984 | +0.2% | 48,500 | 319億4208万 | +3.36% |
| 12/28 | 980 | 987 | 980 | 982 | +0.2% | 43,500 | 318億7715万 | +3.48% |
| 12/27 | 980 | 1,000 | 975 | 980 | +0.62% | 156,500 | 318億1223万 | +3.59% |
| 12/24 | 960 | 978 | 959 | 974 | +1.56% | 126,500 | 316億1746万 | +3.29% |
| 12/23 | 957 | 960 | 956 | 959 | +0.21% | 108,000 | 311億3054万 | +1.91% |
| 12/22 | 957 | 959 | 955 | 957 | +0.21% | 81,000 | 310億6562万 | +1.92% |
| 12/21 | 956 | 958 | 955 | 955 | -0.1% | 127,500 | 310億69万 | +1.92% |
| 12/20 | 958 | 960 | 955 | 956 | -0.31% | 102,500 | 310億3316万 | +2.14% |
| 12/17 | 960 | 960 | 954 | 959 | -0.1% | 156,500 | 311億3054万 | +2.68% |
| 12/16 | 959 | 961 | 957 | 960 | +0.21% | 158,500 | 311億6300万 | +3% |
| 12/15 | 955 | 959 | 955 | 958 | +0.21% | 61,000 | 310億9808万 | +3.12% |
| 12/14 | 955 | 958 | 954 | 956 | +0.21% | 73,500 | 310億3316万 | +3.02% |
| 12/13 | 960 | 960 | 954 | 954 | -0.31% | 48,500 | 309億6823万 | +2.91% |
| 12/10 | 959 | 961 | 957 | 957 | -0.21% | 109,000 | 310億6562万 | +3.35% |
| 12/09 | 957 | 960 | 956 | 959 | +0.31% | 62,000 | 311億3054万 | +3.56% |
| 12/08 | 961 | 961 | 955 | 956 | -0.42% | 104,500 | 310億3316万 | +3.35% |
| 12/07 | 958 | 964 | 956 | 960 | +0.21% | 143,500 | 311億6300万 | +3.9% |
| 12/06 | 961 | 967 | 956 | 958 | -0.62% | 135,000 | 310億9808万 | +3.79% |
| 12/03 | 958 | 967 | 948 | 964 | +0.84% | 146,000 | 312億9285万 | +4.44% |
| 12/02 | 968 | 968 | 943 | 956 | -5.91% | 422,000 | 310億3316万 | +3.13% |
| 12/01 | 1,016 | 1,016 | 1,016 | 1,016 | +16.11% | 39,500 | 329億8084万 | +9.36% |
| 11/30 | （IR情報）17:00 当社親会社である大同特殊鋼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 |
| 11/30 | 881 | 890 | 871 | 875 | +0.46% | 69,500 | 284億378万 | -5.71% |
| 11/29 | 881 | 891 | 867 | 871 | -2.57% | 123,500 | 282億7393万 | -6.55% |
| 11/26 | 897 | 902 | 884 | 894 | -0.56% | 69,500 | 290億2054万 | -4.49% |
| 11/25 | 907 | 907 | 897 | 899 | -0.44% | 31,500 | 291億8285万 | -4.36% |
| 11/24 | 908 | 912 | 894 | 903 | -0.99% | 69,000 | 293億1270万 | -4.24% |
| 11/22 | 912 | 914 | 905 | 912 | -0.22% | 29,000 | 296億485万 | -3.59% |
| 11/19 | 906 | 916 | 904 | 914 | -0.33% | 51,500 | 296億6977万 | -3.59% |
| 11/18 | 900 | 918 | 898 | 917 | +1.44% | 57,000 | 297億6716万 | -3.47% |
| 11/17 | 919 | 919 | 900 | 904 | -1.2% | 43,500 | 293億4516万 | -4.94% |
| 11/16 | 921 | 928 | 908 | 915 | -0.65% | 91,500 | 297億224万 | -3.89% |
| 11/15 | 919 | 931 | 917 | 921 | +0.66% | 79,500 | 298億9700万 | -3.46% |
| 11/12 | 896 | 919 | 896 | 915 | +2.35% | 73,500 | 297億224万 | -4.09% |
| 11/11 | 901 | 910 | 894 | 894 | -0.67% | 60,500 | 290億2054万 | -6.39% |
| 11/10 | 918 | 918 | 896 | 900 | -2.17% | 138,500 | 292億1531万 | -5.86% |
| 11/09 | 926 | 933 | 920 | 920 | -1.08% | 62,000 | 298億6454万 | -3.87% |
| 11/08 | 952 | 952 | 922 | 930 | -1.06% | 77,500 | 301億8916万 | -2.92% |
| 11/05 | 957 | 958 | 936 | 940 | -1.98% | 94,000 | 305億1377万 | -1.88% |
| 11/04 | 947 | 959 | 935 | 959 | +2.24% | 289,000 | 311億3054万 | -0.1% |
| 11/02 | 946 | 957 | 935 | 938 | +0.64% | 157,500 | 304億4885万 | -2.49% |
| 11/01 | 950 | 950 | 916 | 932 | -0.43% | 310,000 | 302億5408万 | -3.52% |
| 10/29 | 941 | 950 | 936 | 936 | -1.99% | 228,500 | 303億8393万 | -3.41% |
| 10/28 | 940 | 958 | 930 | 955 | -10.08% | 857,500 | 310億69万 | -1.75% |
| 10/27 | （IR情報）15:40 2022年3月期第2四半期決算短信〔日本基準〕(連結) |
| 10/27 | 1,010 | 1,062 | 1,010 | 1,062 | +5.57% | 349,000 | 344億7407万 | +9.15% |
| 10/26 | 999 | 1,012 | 993 | 1,006 | +1.72% | 82,000 | 326億5623万 | +3.71% |
| 10/25 | 964 | 994 | 960 | 989 | +1.12% | 116,500 | 321億438万 | +1.85% |
| 10/22 | 968 | 982 | 965 | 978 | +0.72% | 55,500 | 317億4731万 | +0.51% |
| 10/21 | 977 | 985 | 970 | 971 | -1.32% | 54,500 | 315億2008万 | -0.51% |
| 10/20 | 990 | 996 | 975 | 984 | -0.3% | 79,000 | 319億4208万 | +0.51% |
| 10/19 | 984 | 992 | 979 | 987 | +1.02% | 58,000 | 320億3946万 | +0.51% |
| 10/18 | 982 | 992 | 974 | 977 | +0.93% | 44,000 | 317億1485万 | -0.71% |
| 10/15 | 955 | 972 | 955 | 968 | +2.65% | 66,500 | 314億2269万 | -1.83% |
| 10/14 | 948 | 949 | 938 | 943 | -0.32% | 35,500 | 306億1116万 | -4.55% |
| 10/13 | 947 | 951 | 937 | 946 | 0% | 55,000 | 307億854万 | -4.54% |
| 10/12 | 961 | 964 | 938 | 946 | -1.25% | 64,000 | 307億854万 | -4.73% |
| 10/11 | 941 | 958 | 932 | 958 | +3.23% | 65,000 | 310億9808万 | -3.72% |
| 10/08 | 935 | 938 | 926 | 928 | +0.54% | 61,500 | 301億2423万 | -6.92% |
