| 2018 |
| 03/20 | 1,841 | 1,863 | 1,822 | 1,835 | -1.87% | 49,700 | 208億5881万 | -3.37% |
| 03/19 | 1,881 | 1,913 | 1,846 | 1,870 | -1.58% | 59,100 | 212億5666万 | -1.58% |
| 03/16 | 1,916 | 1,922 | 1,890 | 1,900 | -0.78% | 36,700 | 215億9768万 | -0.11% |
| 03/15 | 1,914 | 1,930 | 1,886 | 1,915 | -0.47% | 47,000 | 217億6818万 | +0.52% |
| 03/14 | 1,944 | 1,949 | 1,911 | 1,924 | -0.93% | 29,400 | 218億7049万 | +1% |
| 03/13 | 1,878 | 1,943 | 1,872 | 1,942 | +3.13% | 46,000 | 220億7510万 | +2.05% |
| 03/12 | 1,929 | 1,929 | 1,869 | 1,883 | +0.48% | 33,800 | 214億443万 | -1.26% |
| 03/09 | 1,908 | 1,910 | 1,852 | 1,874 | -0.21% | 31,500 | 213億213万 | -2.29% |
| 03/08 | 1,849 | 1,891 | 1,845 | 1,878 | +2.18% | 25,500 | 213億4760万 | -2.85% |
| 03/07 | 1,850 | 1,876 | 1,825 | 1,838 | -0.59% | 34,600 | 208億9291万 | -5.65% |
| 03/06 | 1,855 | 1,887 | 1,833 | 1,849 | +2.38% | 52,200 | 210億1795万 | -5.95% |
| 03/05 | 17:00 役員体制および執行体制の変更に関するお知らせ |
| 03/05 | 1,851 | 1,890 | 1,795 | 1,806 | -2.33% | 92,100 | 205億2916万 | -9.02% |
| 03/02 | 1,854 | 1,866 | 1,833 | 1,849 | -2.38% | 52,000 | 210億1795万 | -7.83% |
| 03/01 | 1,908 | 1,937 | 1,876 | 1,894 | -2.67% | 78,600 | 215億2947万 | -6.42% |
| 02/28 | 1,903 | 1,975 | 1,902 | 1,946 | +1.35% | 89,200 | 221億2057万 | -4.65% |
| 02/27 | 1,969 | 1,969 | 1,910 | 1,920 | -0.93% | 61,800 | 218億2502万 | -6.57% |
| 02/26 | 1,916 | 1,962 | 1,916 | 1,938 | +1.15% | 36,600 | 220億2963万 | -6.38% |
| 02/23 | 1,923 | 1,944 | 1,901 | 1,916 | -0.42% | 66,400 | 217億7955万 | -8.02% |
| 02/22 | 1,942 | 1,959 | 1,889 | 1,924 | -1.84% | 101,800 | 218億7049万 | -8.34% |
| 02/21 | 1,966 | 2,005 | 1,940 | 1,960 | -1.41% | 59,700 | 222億7971万 | -7.46% |
| 02/20 | 1,995 | 2,008 | 1,959 | 1,988 | -1.29% | 75,800 | 225億9799万 | -6.89% |
| 02/19 | 1,915 | 2,014 | 1,908 | 2,014 | +5.33% | 109,200 | 228億9354万 | -6.93% |
| 02/16 | 1,900 | 1,929 | 1,880 | 1,912 | +1.76% | 45,800 | 217億3408万 | -12.53% |
| 02/15 | 1,820 | 1,901 | 1,812 | 1,879 | +3.7% | 59,400 | 213億5896万 | -15.13% |
| 02/14 | 1,861 | 1,869 | 1,755 | 1,812 | -2.74% | 112,600 | 205億9736万 | -19.18% |
| 02/13 | 1,951 | 1,973 | 1,843 | 1,863 | -3.52% | 79,000 | 211億7709万 | -18.07% |
| 02/09 | 1,880 | 1,932 | 1,880 | 1,931 | -2.28% | 113,000 | 219億5006万 | -16.01% |
| 02/08 | 2,015 | 2,022 | 1,911 | 1,976 | +4% | 131,900 | 224億6158万 | -14.79% |
| 02/07 | 2,005 | 2,019 | 1,880 | 1,900 | +0.8% | 133,500 | 215億9768万 | -18.63% |
| 02/06 | 1,918 | 1,934 | 1,767 | 1,885 | -7.82% | 286,400 | 214億2717万 | -19.89% |
| 02/05 | 2,107 | 2,129 | 2,032 | 2,045 | -5.54% | 177,100 | 232億4592万 | -13.86% |
| 02/02 | 2,250 | 2,250 | 2,128 | 2,165 | -2.87% | 197,300 | 246億998万 | -9.26% |
| 02/01 | 2,252 | 2,252 | 2,191 | 2,229 | -1.02% | 181,200 | 253億3748万 | -6.93% |
| 01/31 | 2,267 | 2,293 | 2,252 | 2,252 | -1.83% | 81,500 | 255億9893万 | -6.24% |
| 01/30 | 2,324 | 2,324 | 2,267 | 2,294 | -1.29% | 73,400 | 260億7635万 | -4.73% |
| 01/29 | 18:00 (訂正)適時開示資料「募集新株予約権(業績連動型有償ストック・オプション) |
| 01/29 | 2,344 | 2,354 | 2,323 | 2,324 | -0.64% | 43,400 | 264億1737万 | -3.69% |
| 01/26 | 2,306 | 2,360 | 2,300 | 2,339 | +1.83% | 185,400 | 265億8788万 | -3.23% |
| 01/25 | 15:00 募集新株予約権(業績連動型有償ストック・オプション)の譲渡に関するお知らせ |
| 01/25 | 15:00 募集新株予約権(業績連動型有償ストック・オプション)の譲渡に関するお知らせ |
| 01/25 | 2,320 | 2,320 | 2,289 | 2,297 | -1.25% | 70,300 | 261億1045万 | -5.04% |
| 01/24 | 2,290 | 2,342 | 2,282 | 2,326 | +2.11% | 166,200 | 264億4010万 | -4% |
| 01/23 | 2,318 | 2,318 | 2,256 | 2,278 | -1.3% | 187,300 | 258億9448万 | -6.18% |
| 01/22 | 2,251 | 2,316 | 2,251 | 2,308 | +1.81% | 140,400 | 262億3549万 | -5.25% |
| 01/19 | 2,310 | 2,340 | 2,256 | 2,267 | -2.07% | 228,800 | 257億6944万 | -7.2% |
| 01/18 | 2,382 | 2,385 | 2,310 | 2,315 | -3.14% | 291,700 | 263億1506万 | -5.59% |
| 01/17 | 17:00 2018年2月期第3四半期決算説明会資料 |
| 01/17 | 2,388 | 2,411 | 2,376 | 2,390 | -0.33% | 174,400 | 271億6760万 | -2.77% |
| 01/16 | 2,471 | 2,521 | 2,346 | 2,398 | -10.92% | 505,600 | 272億5854万 | -2.48% |
| 01/15 | 15:05 平成30年2月期第3四半期決算短信[日本基準](連結) |
| 01/15 | 2,581 | 2,692 | 2,581 | 2,692 | +4.67% | 181,700 | 306億50万 | +9.61% |
| 01/12 | 2,630 | 2,630 | 2,545 | 2,572 | -1.19% | 89,400 | 292億3643万 | +5.32% |
| 01/11 | 2,571 | 2,635 | 2,569 | 2,603 | +0.81% | 83,300 | 295億8882万 | +6.99% |
| 01/10 | 11:30 韓国大手電子書店「YES24」へのビューア提供開始 |
| 01/10 | 2,634 | 2,662 | 2,572 | 2,582 | -1.07% | 140,800 | 293億5011万 | +6.47% |
| 01/09 | 2,569 | 2,617 | 2,540 | 2,610 | +4.86% | 181,800 | 296億6839万 | +7.94% |
| 01/05 | 2,440 | 2,512 | 2,424 | 2,489 | +2.47% | 78,200 | 282億9296万 | +3.41% |
| 01/04 | 2,414 | 2,440 | 2,406 | 2,429 | +2.27% | 69,200 | 276億1092万 | +1.08% |
| 2017 |
| 12/29 | 2,370 | 2,388 | 2,363 | 2,375 | +0.21% | 21,500 | 269億9710万 | -1.12% |
| 12/28 | 2,392 | 2,400 | 2,360 | 2,370 | -0.84% | 46,100 | 269億4026万 | -1.37% |
| 12/27 | 2,350 | 2,408 | 2,350 | 2,390 | +1.83% | 62,300 | 271億6760万 | -0.67% |
| 12/26 | 2,387 | 2,407 | 2,346 | 2,347 | -1.68% | 83,600 | 266億7881万 | -2.53% |
| 12/25 | 2,405 | 2,428 | 2,337 | 2,387 | -0.75% | 90,200 | 271億3350万 | -0.95% |
| 12/22 | 2,416 | 2,480 | 2,396 | 2,405 | -0.46% | 109,500 | 273億3811万 | -0.21% |
| 12/21 | 2,403 | 2,458 | 2,400 | 2,416 | +0.17% | 47,900 | 273億4718万 | +0.37% |
| 12/20 | 2,428 | 2,441 | 2,395 | 2,412 | -0.62% | 47,400 | 273億191万 | +0.33% |
| 12/19 | 2,403 | 2,447 | 2,388 | 2,427 | +1.25% | 51,900 | 274億7169万 | +0.87% |
| 12/18 | 2,410 | 2,434 | 2,381 | 2,397 | +0.04% | 58,500 | 271億3212万 | -0.5% |
| 12/15 | 2,447 | 2,450 | 2,381 | 2,396 | -2.08% | 79,400 | 271億2080万 | -0.83% |
| 12/14 | 2,460 | 2,485 | 2,437 | 2,447 | -1.61% | 54,600 | 276億9808万 | +0.99% |
| 12/13 | 2,474 | 2,520 | 2,460 | 2,487 | +0.12% | 70,700 | 281億5085万 | +2.39% |
| 12/12 | 2,498 | 2,560 | 2,476 | 2,484 | +0.08% | 103,100 | 281億1689万 | +2.1% |
| 12/11 | 2,469 | 2,518 | 2,454 | 2,482 | +1.1% | 138,300 | 280億9425万 | +1.89% |
| 12/08 | 2,406 | 2,466 | 2,405 | 2,455 | +1.7% | 113,800 | 277億8863万 | +0.57% |
| 12/07 | 2,338 | 2,415 | 2,318 | 2,414 | +3.92% | 122,800 | 273億2454万 | -1.35% |
| 12/06 | 2,355 | 2,382 | 2,313 | 2,323 | -1.36% | 118,900 | 262億9450万 | -5.45% |
| 12/05 | 11:30 「W3C Publishing Summit」において、日本代表としてアジアの電子書籍に関するプレゼンテーションを実施 |
| 12/05 | 2,350 | 2,359 | 2,316 | 2,355 | +0.21% | 61,000 | 266億5671万 | -4.69% |
| 12/04 | 2,400 | 2,421 | 2,350 | 2,350 | -1.55% | 90,700 | 266億12万 | -5.17% |
| 12/01 | 2,440 | 2,440 | 2,381 | 2,387 | -1.45% | 54,600 | 270億1893万 | -3.9% |
| 11/30 | 2,355 | 2,425 | 2,338 | 2,422 | +3.46% | 166,100 | 275億3135万 | -2.69% |
| 11/29 | 2,350 | 2,400 | 2,321 | 2,341 | -1.06% | 136,700 | 266億1061万 | -6.13% |
| 11/28 | 2,418 | 2,430 | 2,354 | 2,366 | -2.23% | 181,700 | 268億9479万 | -5.47% |
| 11/27 | 2,428 | 2,455 | 2,402 | 2,420 | +0.67% | 91,900 | 275億862万 | -3.66% |
| 11/24 | 2,426 | 2,450 | 2,386 | 2,404 | -1.23% | 79,200 | 273億2674万 | -4.49% |
| 11/22 | 2,442 | 2,509 | 2,400 | 2,434 | -0.41% | 236,200 | 276億6776万 | -3.72% |
| 11/21 | 2,420 | 2,449 | 2,380 | 2,444 | +2.56% | 100,000 | 277億8143万 | -3.86% |
| 11/20 | 2,357 | 2,393 | 2,336 | 2,383 | -0.21% | 92,300 | 270億8803万 | -7.02% |
| 11/17 | 2,370 | 2,407 | 2,348 | 2,388 | +1.79% | 181,100 | 271億4487万 | -7.66% |
| 11/16 | 2,330 | 2,384 | 2,309 | 2,346 | +0.39% | 196,600 | 266億6745万 | -9.73% |
| 11/15 | 2,440 | 2,472 | 2,329 | 2,337 | -4.69% | 205,400 | 265億6514万 | -10.7% |
| 11/14 | 2,511 | 2,524 | 2,452 | 2,452 | -2.54% | 112,700 | 278億7237万 | -6.91% |
| 11/13 | 2,570 | 2,570 | 2,512 | 2,516 | -2.1% | 84,900 | 285億9987万 | -4.84% |
| 11/10 | 2,523 | 2,579 | 2,521 | 2,570 | +0.12% | 51,200 | 292億1370万 | -3.06% |
| 11/09 | 2,625 | 2,640 | 2,526 | 2,567 | -1.61% | 115,600 | 291億7960万 | -3.35% |
| 11/08 | 2,590 | 2,627 | 2,573 | 2,609 | +1.05% | 76,800 | 296億5702万 | -1.99% |
| 11/07 | 2,543 | 2,586 | 2,543 | 2,582 | +1.29% | 88,600 | 293億5011万 | -3.04% |
| 11/06 | 2,596 | 2,607 | 2,520 | 2,549 | -2.04% | 143,000 | 289億7499万 | -4.28% |
| 11/02 | 2,628 | 2,634 | 2,581 | 2,602 | -0.61% | 65,600 | 295億7745万 | -2.22% |
| 11/01 | 2,700 | 2,700 | 2,590 | 2,618 | -2.02% | 128,000 | 297億5932万 | -1.47% |
| 10/31 | 2,619 | 2,706 | 2,608 | 2,672 | +0.83% | 180,700 | 303億7315万 | +0.72% |
| 10/30 | 2,561 | 2,650 | 2,545 | 2,650 | +4.08% | 228,500 | 301億2308万 | +0.04% |
| 10/27 | 2,502 | 2,546 | 2,465 | 2,546 | +1.84% | 191,000 | 289億4089万 | -3.74% |
| 10/26 | 2,511 | 2,544 | 2,491 | 2,500 | -0.24% | 100,700 | 284億1800万 | -5.55% |
| 10/25 | 2,574 | 2,580 | 2,500 | 2,506 | -1.99% | 163,400 | 284億8620万 | -5.4% |
| 10/24 | 2,584 | 2,584 | 2,533 | 2,557 | -0.47% | 77,300 | 290億6593万 | -3.51% |
| 10/23 | 2,608 | 2,608 | 2,541 | 2,569 | -0.35% | 117,400 | 292億233万 | -2.98% |
