| 2026 |
| 03/06 | 2,810 | 2,899 | 2,798 | 2,867 | +0.81% | 5,900,700 | 5兆4311億 | -2.08% |
| 03/05 | 2,860 | 2,878 | 2,833 | 2,844 | +1.21% | 8,599,100 | 5兆3875億 | -2.94% |
| 03/04 | 2,801 | 2,849 | 2,797 | 2,810 | -1.02% | 8,810,900 | 5兆3231億 | -4.36% |
| 03/03 | 2,936 | 2,943 | 2,839 | 2,839 | -3.3% | 10,156,000 | 5兆3780億 | -3.8% |
| 03/02 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |
| 03/02 | 3,035 | 3,036 | 2,933 | 2,936 | -4.18% | 9,765,900 | 5兆5618億 | -0.91% |
| 02/27 | 3,056 | 3,065 | 3,033 | 3,064 | +0.43% | 8,393,600 | 5兆8042億 | +3.13% |
| 02/26 | (IR情報)13:00 代表取締役の異動、取締役および監査役の候補者選定に関するお知らせ |
| 02/26 | 3,007 | 3,066 | 3,002 | 3,051 | +1.84% | 7,412,800 | 5兆7796億 | +2.55% |
| 02/25 | 3,025 | 3,025 | 2,982 | 2,996 | +0.6% | 5,658,100 | 5兆6754億 | +0.47% |
| 02/24 | 2,965 | 3,043 | 2,935 | 2,978 | +2.02% | 9,005,500 | 5兆6413億 | -0.5% |
| 02/20 | 2,919 | 2,949 | 2,897 | 2,919 | -0.75% | 6,321,000 | 5兆5296億 | -2.89% |
| 02/19 | 2,889 | 2,941 | 2,863 | 2,941 | +0.07% | 8,606,400 | 5兆5712億 | -2.81% |
| 02/18 | 2,958 | 2,974 | 2,933 | 2,939 | -0.41% | 6,447,500 | 5兆5674億 | -3.45% |
| 02/17 | 2,951 | 2,975 | 2,932 | 2,951 | -0.14% | 6,662,200 | 5兆5902億 | -3.81% |
| 02/16 | (自社株買い)取締役会(2025年4月25日)での決議状況(取得期間2025年5月1日~2026年3月24日) |
| 02/16 | 2,955 | 2,978 | 2,940 | 2,955 | +0.58% | 6,054,800 | 5兆5978億 | -4.4% |
| 02/13 | 2,906 | 2,974 | 2,906 | 2,938 | +1.1% | 8,957,600 | 5兆5656億 | -5.68% |
| 02/12 | 2,969 | 2,971 | 2,899 | 2,906 | -2.61% | 10,262,600 | 5兆5049億 | -7.33% |
| 02/10 | 2,958 | 3,028 | 2,946 | 2,984 | +1.08% | 7,436,300 | 5兆6527億 | -5.51% |
| 02/09 | 2,954 | 2,974 | 2,908 | 2,952 | +2.89% | 10,218,400 | 5兆5921億 | -7.14% |
| 02/06 | (5%ルール)Capital International, Inc.(0%)Capital Research and Management Company(3.83%) |
| 02/06 | 2,870 | 2,878 | 2,816 | 2,869 | -2.22% | 13,714,100 | 5兆4348億 | -10.2% |
| 02/05 | 2,939 | 2,993 | 2,912 | 2,934 | +0.93% | 11,051,700 | 5兆5580億 | -8.74% |
| 02/04 | 2,900 | 2,947 | 2,856 | 2,907 | -0.95% | 9,084,400 | 5兆5068億 | -10.14% |
| 02/03 | 2,947 | 3,011 | 2,932 | 2,935 | +0.62% | 12,385,000 | 5兆5599億 | -9.83% |
| 02/02 | (IR情報)15:30 (訂正)「自己株式の取得状況に関するお知らせ」の一部訂正について |
| 02/02 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |
| 02/02 | 2,933 | 2,974 | 2,860 | 2,917 | +2.86% | 14,198,000 | 5兆5258億 | -10.85% |
| 01/30 | (IR情報)17:00 当社と完全子会社である第一三共ビジネスアソシエの吸収合併(簡易合併・略式合併)に係る基本方針決定に関するお知らせ |
| 01/30 | (IR情報)13:00 2026年3月期第3四半期決算短信〔IFRS〕(連結) |
| 01/30 | (IR情報)13:00 決算補足資料(2025年度第3四半期決算) |
| 01/30 | (IR情報)13:00 2025年度第3四半期決算説明会資料 |
| 01/30 | 2,935 | 2,984 | 2,684 | 2,836 | -3.24% | 26,292,800 | 5兆3723億 | -13.75% |
| 01/29 | 2,880 | 2,931 | 2,844 | 2,931 | +0.1% | 11,167,800 | 5兆5523億 | -11.34% |
| 01/28 | 2,959 | 2,962 | 2,878 | 2,928 | -3.81% | 13,089,000 | 5兆5466億 | -11.83% |
| 01/27 | 3,093 | 3,100 | 3,022 | 3,044 | -2.44% | 9,725,800 | 5兆7664億 | -8.78% |
| 01/26 | 3,096 | 3,120 | 3,067 | 3,120 | -0.41% | 7,009,500 | 5兆9103億 | -6.98% |
| 01/23 | 3,118 | 3,177 | 3,112 | 3,133 | -0.19% | 25,118,400 | 5兆9350億 | -6.92% |
| 01/22 | (5%ルール)Capital International, Inc.(0.23%)Capital Research and Management Company(5.55%) |
| 01/22 | 3,150 | 3,177 | 3,122 | 3,139 | -1.32% | 10,889,300 | 5兆9463億 | -7.1% |
| 01/21 | 3,201 | 3,215 | 3,161 | 3,181 | -1.21% | 9,972,300 | 6兆259億 | -6.11% |
| 01/20 | 3,254 | 3,264 | 3,220 | 3,220 | -1.53% | 10,346,300 | 6兆998億 | -5.18% |
| 01/19 | 3,270 | 3,288 | 3,221 | 3,270 | -1.18% | 12,192,900 | 6兆1945億 | -3.91% |
| 01/16 | 3,354 | 3,370 | 3,301 | 3,309 | -2.71% | 14,125,900 | 6兆2684億 | -2.99% |
| 01/15 | 3,430 | 3,443 | 3,399 | 3,401 | +0.32% | 12,168,500 | 6兆4426億 | -0.44% |
| 01/14 | (自社株買い)取締役会(2025年4月25日)での決議状況(取得期間2025年5月1日~2026年3月24日) |
| 01/14 | 3,498 | 3,499 | 3,390 | 3,390 | -4.24% | 11,283,700 | 6兆4218億 | -0.82% |
| 01/13 | 3,600 | 3,625 | 3,538 | 3,540 | -0.06% | 7,129,100 | 6兆7060億 | +3.33% |
| 01/09 | 3,500 | 3,542 | 3,477 | 3,542 | +0.14% | 5,910,900 | 6兆7097億 | +3.39% |
| 01/08 | 3,511 | 3,558 | 3,487 | 3,537 | +1.93% | 6,186,200 | 6兆7003億 | +3.03% |
| 01/07 | 3,451 | 3,483 | 3,440 | 3,470 | +0.55% | 5,269,600 | 6兆5733億 | +0.73% |
| 01/06 | 3,487 | 3,528 | 3,435 | 3,451 | -2.24% | 7,510,800 | 6兆5374億 | -0.26% |
| 01/05 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |
| 01/05 | 3,400 | 3,538 | 3,400 | 3,530 | +5.44% | 7,965,700 | 6兆6870億 | +1.58% |
| 2025 |
| 12/30 | 3,362 | 3,376 | 3,331 | 3,348 | -0.65% | 3,943,100 | 6兆3422億 | -4.01% |
| 12/29 | 3,416 | 3,424 | 3,364 | 3,370 | -1.84% | 3,914,000 | 6兆3839億 | -3.91% |
| 12/26 | 3,420 | 3,457 | 3,418 | 3,433 | +0.64% | 3,326,100 | 6兆5033億 | -2.47% |
| 12/25 | 3,390 | 3,442 | 3,360 | 3,411 | +2.13% | 3,581,400 | 6兆4616億 | -3.32% |
| 12/24 | 3,337 | 3,387 | 3,335 | 3,340 | +0.24% | 5,333,200 | 6兆3271億 | -5.46% |
| 12/23 | 3,300 | 3,336 | 3,285 | 3,332 | +1.43% | 5,097,200 | 6兆3119億 | -5.8% |
| 12/22 | (5%ルール)ニッセイアセットマネジメント(0.18%)日本生命保険(4.26%) |
| 12/22 | 3,313 | 3,332 | 3,257 | 3,285 | -0.45% | 7,196,800 | 6兆2229億 | -7.28% |
| 12/19 | 3,362 | 3,368 | 3,286 | 3,300 | -1.23% | 11,547,200 | 6兆2513億 | -7.09% |
| 12/18 | 3,429 | 3,457 | 3,341 | 3,341 | -3.5% | 8,277,100 | 6兆3290億 | -6.07% |
| 12/17 | 3,425 | 3,475 | 3,404 | 3,462 | +1.64% | 7,334,300 | 6兆5582億 | -2.81% |
| 12/16 | 3,480 | 3,510 | 3,404 | 3,406 | -2.1% | 6,703,000 | 6兆4521億 | -4.3% |
| 12/15 | (IR情報)16:00 第一三共Science&Technology Day 2025の開催について |
| 12/15 | 3,393 | 3,479 | 3,381 | 3,479 | +3.51% | 6,153,500 | 6兆5904億 | -2.14% |
| 12/12 | 3,350 | 3,389 | 3,345 | 3,361 | +0.03% | 6,751,400 | 6兆3669億 | -5.32% |
| 12/11 | 3,425 | 3,441 | 3,360 | 3,360 | -1.61% | 4,581,200 | 6兆3650億 | -5.41% |
| 12/10 | 3,450 | 3,469 | 3,394 | 3,415 | -1.59% | 5,513,800 | 6兆4692億 | -3.88% |
| 12/09 | (自社株買い)取締役会(2025年4月25日)での決議状況(取得期間2025年5月1日~2026年3月24日) |
| 12/09 | 3,472 | 3,507 | 3,445 | 3,470 | +1.2% | 5,525,100 | 6兆5733億 | -2.28% |
| 12/08 | 3,452 | 3,465 | 3,416 | 3,429 | -0.78% | 5,170,200 | 6兆4957億 | -3.65% |
| 12/05 | 3,512 | 3,534 | 3,442 | 3,456 | -3.25% | 8,205,200 | 6兆5468億 | -3.33% |
| 12/04 | 3,555 | 3,595 | 3,511 | 3,572 | +0.31% | 5,367,400 | 6兆7666億 | -0.56% |
| 12/03 | (IR情報)15:30 当社ADC製品に関するSeagen社との特許係争の判決に関するお知らせ |
| 12/03 | 3,658 | 3,668 | 3,528 | 3,561 | -4.12% | 5,568,800 | 6兆7457億 | -1.3% |
| 12/02 | 3,750 | 3,804 | 3,662 | 3,714 | -2.72% | 5,036,800 | 7兆356億 | +2.43% |
| 12/01 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |
| 12/01 | 3,795 | 3,848 | 3,764 | 3,818 | -1.19% | 3,914,800 | 7兆2326億 | +4.98% |
| 11/28 | 3,782 | 3,864 | 3,780 | 3,864 | +1.47% | 4,172,500 | 7兆3197億 | +5.95% |
| 11/27 | 3,800 | 3,854 | 3,782 | 3,808 | -1.4% | 3,779,800 | 7兆2136億 | +4.16% |
| 11/26 | 3,888 | 3,913 | 3,782 | 3,862 | +0.78% | 5,457,700 | 7兆3159億 | +5.29% |
| 11/25 | 3,770 | 3,858 | 3,725 | 3,832 | +3.57% | 8,205,000 | 7兆2591億 | +4.19% |
| 11/21 | 3,575 | 3,700 | 3,562 | 3,700 | +2.01% | 15,382,100 | 7兆90億 | +0.41% |
| 11/20 | 3,513 | 3,639 | 3,503 | 3,627 | +2.86% | 5,455,000 | 6兆8708億 | -1.97% |
| 11/19 | 3,499 | 3,545 | 3,457 | 3,526 | +2.41% | 6,888,300 | 6兆6794億 | -5.14% |
| 11/18 | 3,463 | 3,520 | 3,433 | 3,443 | -1.09% | 5,453,900 | 6兆5222億 | -7.72% |
| 11/17 | (自社株買い)取締役会(2025年4月25日)での決議状況(取得期間2025年5月1日~2026年3月24日) |
| 11/17 | 3,470 | 3,494 | 3,425 | 3,481 | -0.68% | 4,804,500 | 6兆5942億 | -7.32% |
| 11/14 | 3,505 | 3,527 | 3,425 | 3,505 | +2.34% | 6,625,700 | 6兆6396億 | -7.37% |
| 11/13 | 3,451 | 3,493 | 3,425 | 3,425 | -1.15% | 4,254,100 | 6兆4881億 | -10.03% |
| 11/12 | 3,484 | 3,523 | 3,445 | 3,465 | +2.15% | 6,568,700 | 6兆5639億 | -9.53% |
| 11/11 | 3,295 | 3,406 | 3,281 | 3,392 | +2.63% | 6,234,900 | 6兆4256億 | -11.83% |
| 11/10 | 3,370 | 3,380 | 3,303 | 3,305 | -1.87% | 4,999,800 | 6兆2608億 | -14.4% |
| 11/07 | 3,403 | 3,412 | 3,346 | 3,368 | -1.26% | 5,783,500 | 6兆3801億 | -13.06% |
| 11/06 | 3,400 | 3,453 | 3,383 | 3,411 | +1.25% | 4,675,600 | 6兆4616億 | -11.97% |
| 11/05 | 3,438 | 3,537 | 3,342 | 3,369 | -0.03% | 10,334,800 | 6兆3820億 | -12.97% |
| 11/04 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |
| 11/04 | 3,677 | 3,696 | 3,342 | 3,370 | -8.15% | 13,686,800 | 6兆3839億 | -12.87% |
| 10/31 | (IR情報)13:00 2026年3月期第2四半期(中間期)決算短信〔IFRS〕(連結) |
| 10/31 | (IR情報)13:00 決算補足資料(2025年度第2四半期決算) |
| 10/31 | (IR情報)13:00 2025年度第2四半期決算説明会資料 |
| 10/31 | 3,893 | 3,945 | 3,562 | 3,669 | -4.5% | 10,531,600 | 6兆9503億 | -5.12% |
| 10/30 | 3,879 | 3,881 | 3,800 | 3,842 | -0.6% | 5,444,900 | 7兆2780億 | -0.39% |
| 10/29 | 3,931 | 3,956 | 3,837 | 3,865 | -2.87% | 3,636,200 | 7兆3216億 | +0.65% |
| 10/28 | 4,057 | 4,066 | 3,979 | 3,979 | -0.5% | 3,700,200 | 7兆5376億 | +4.08% |
| 10/27 | 4,075 | 4,088 | 3,999 | 3,999 | -0.15% | 4,148,000 | 7兆5755億 | +5.1% |
| 10/24 | 4,068 | 4,092 | 4,005 | 4,005 | -1.28% | 3,085,000 | 7兆5868億 | +5.64% |
| 10/23 | 4,077 | 4,120 | 4,016 | 4,057 | -0.73% | 3,967,500 | 7兆6853億 | +7.56% |
| 10/22 | (5%ルール)Capital International, Inc.(0.23%)Capital Research and Management Company(6.91%) |
| 10/22 | 4,116 | 4,152 | 4,035 | 4,087 | -0.9% | 4,903,000 | 7兆7422億 | +8.9% |
| 10/21 | 4,084 | 4,170 | 4,080 | 4,124 | +0.49% | 4,130,200 | 7兆8123億 | +10.53% |
| 10/20 | 4,120 | 4,121 | 4,037 | 4,104 | +2.7% | 4,577,800 | 7兆7744億 | +10.71% |
| 10/17 | 4,044 | 4,097 | 3,987 | 3,996 | -2.32% | 4,957,200 | 7兆5698億 | +8.44% |
| 10/16 | 4,050 | 4,091 | 3,934 | 4,091 | +1.39% | 4,743,900 | 7兆7497億 | +11.41% |
| 10/15 | 3,883 | 4,062 | 3,878 | 4,035 | +3.46% | 7,052,400 | 7兆6437億 | +10.34% |
| 10/14 | 3,950 | 3,979 | 3,872 | 3,900 | -4.04% | 8,359,600 | 7兆3879億 | +7.14% |
| 10/10 | (自社株買い)取締役会(2025年4月25日)での決議状況(取得期間2025年5月1日~2026年3月24日) |
| 10/10 | 4,160 | 4,168 | 4,042 | 4,064 | -2.64% | 8,345,900 | 7兆6986億 | +11.99% |
| 10/09 | 4,085 | 4,178 | 4,077 | 4,174 | +2.45% | 6,968,500 | 7兆9070億 | +15.69% |
| 10/08 | 4,118 | 4,165 | 4,053 | 4,074 | +1.82% | 10,429,500 | 7兆7175億 | +13.74% |
| 10/07 | 3,939 | 4,011 | 3,920 | 4,001 | +2.46% | 8,912,000 | 7兆5792億 | +12.32% |
| 10/01 | (IR情報)12:00 自己株式の取得状況に関するお知らせ |