| 2021 |
| 05/10 | 1,253 | 1,260 | 1,244 | 1,249 | -0.48% | 170,800 | 1602億4670万 | -2.35% |
| 05/07 | 1,239 | 1,262 | 1,235 | 1,255 | +2.12% | 296,200 | 1610億1650万 | -2.11% |
| 05/06 | 1,222 | 1,251 | 1,221 | 1,229 | +0.33% | 351,200 | 1576億8070万 | -4.43% |
| 04/30 | 1,240 | 1,243 | 1,224 | 1,225 | -0.16% | 311,700 | 1571億6750万 | -4.97% |
| 04/28 | （IR情報）14:00 2021年12月期第1四半期決算短信[日本基準](連結) |
| 04/28 | 1,214 | 1,249 | 1,208 | 1,227 | +1.32% | 425,000 | 1574億2410万 | -5.1% |
| 04/27 | 1,221 | 1,224 | 1,211 | 1,211 | -1.38% | 173,200 | 1553億7130万 | -6.49% |
| 04/26 | 1,248 | 1,248 | 1,228 | 1,228 | -0.65% | 193,900 | 1575億5240万 | -5.61% |
| 04/23 | 1,239 | 1,247 | 1,234 | 1,236 | -1.9% | 137,800 | 1585億7880万 | -5.36% |
| 04/22 | 1,266 | 1,266 | 1,250 | 1,260 | +1.29% | 134,300 | 1616億5800万 | -3.96% |
| 04/21 | 1,266 | 1,267 | 1,234 | 1,244 | -4.01% | 302,100 | 1596億520万 | -5.54% |
| 04/20 | 1,302 | 1,310 | 1,288 | 1,296 | -1.67% | 301,300 | 1662億7680万 | -1.89% |
| 04/19 | （IR情報）17:00 取締役等に対する譲渡制限付株式報酬としての自己株式の処分に関するお知らせ |
| 04/19 | 1,300 | 1,320 | 1,300 | 1,318 | +1.38% | 108,200 | 1690億9940万 | -0.38% |
| 04/16 | 1,299 | 1,302 | 1,286 | 1,300 | -0.54% | 100,200 | 1667億9000万 | -1.81% |
| 04/15 | 1,319 | 1,323 | 1,301 | 1,307 | 0% | 72,700 | 1676億8810万 | -1.36% |
| 04/14 | 1,297 | 1,307 | 1,291 | 1,307 | -1.21% | 204,700 | 1676億8810万 | -1.36% |
| 04/13 | 1,319 | 1,347 | 1,312 | 1,323 | -0.3% | 223,300 | 1697億4090万 | 0% |
| 04/12 | （自社株買い）取締役会(2021年2月12日)での決議状況(取得期間2021年4月20日～2021年12月31日) |
| 04/12 | 1,313 | 1,336 | 1,306 | 1,327 | +2.47% | 313,700 | 1702億5410万 | +0.45% |
| 04/09 | 1,299 | 1,307 | 1,290 | 1,295 | +0.39% | 204,600 | 1661億4850万 | -1.75% |
| 04/08 | 1,304 | 1,310 | 1,290 | 1,290 | -1.75% | 270,600 | 1655億700万 | -2.05% |
| 04/07 | 1,304 | 1,319 | 1,290 | 1,313 | +0.08% | 326,800 | 1684億5790万 | -0.15% |
| 04/06 | 1,334 | 1,337 | 1,296 | 1,312 | -0.98% | 205,900 | 1683億2960万 | 0% |
| 04/05 | 1,316 | 1,327 | 1,310 | 1,325 | +1.15% | 146,700 | 1699億9750万 | +1.3% |
| 04/05 | （空売り報告）三菱UFJモルガン・スタンレー証券 422,200株（0.32%）-0.27%義務消失 |
| 04/02 | 1,297 | 1,314 | 1,293 | 1,310 | +0.69% | 226,300 | 1680億7300万 | +0.46% |
| 04/01 | 1,310 | 1,328 | 1,298 | 1,301 | +0.23% | 194,700 | 1669億1830万 | +0.23% |
| 03/31 | 1,295 | 1,313 | 1,285 | 1,298 | -1.89% | 175,000 | 1665億3340万 | +0.23% |
| 03/30 | 1,330 | 1,330 | 1,307 | 1,323 | -1.27% | 257,600 | 1697億4090万 | +2.4% |
| 03/29 | 1,349 | 1,354 | 1,316 | 1,340 | +1.59% | 333,600 | 1719億2200万 | +3.96% |
| 03/26 | 1,335 | 1,339 | 1,314 | 1,319 | +0.76% | 335,400 | 1692億2770万 | +2.65% |
| 03/25 | 1,301 | 1,313 | 1,297 | 1,309 | +1.55% | 225,000 | 1679億4470万 | +2.27% |
| 03/24 | 1,325 | 1,330 | 1,287 | 1,289 | -4.09% | 352,500 | 1653億7870万 | +0.94% |
| 03/23 | 1,374 | 1,375 | 1,342 | 1,344 | -2.18% | 246,200 | 1724億3520万 | +5.49% |
| 03/22 | 1,371 | 1,380 | 1,349 | 1,374 | +0.15% | 320,800 | 1762億8420万 | +8.27% |
| 03/19 | 1,364 | 1,377 | 1,349 | 1,372 | -0.44% | 382,600 | 1760億2760万 | +8.63% |
| 03/18 | 1,365 | 1,380 | 1,361 | 1,378 | +1.55% | 417,000 | 1767億9740万 | +9.89% |
| 03/17 | 1,339 | 1,357 | 1,329 | 1,357 | +0.44% | 263,600 | 1741億310万 | +9% |
| 03/16 | 1,339 | 1,353 | 1,329 | 1,351 | +0.6% | 303,700 | 1733億3330万 | +9.04% |
| 03/15 | 1,340 | 1,366 | 1,323 | 1,343 | +2.28% | 534,800 | 1723億690万 | +9.01% |
| 03/15 | （空売り報告）三菱UFJモルガン・スタンレー証券 769,700株（0.59%）-0.01% |
| 03/12 | 1,312 | 1,314 | 1,288 | 1,313 | +0.69% | 407,200 | 1684億5790万 | +7.27% |
| 03/12 | （空売り報告）三菱UFJモルガン・スタンレー証券 776,900株（0.6%）+0.01% |
| 03/11 | 1,297 | 1,325 | 1,285 | 1,304 | +2.92% | 545,300 | 1673億320万 | +6.97% |
| 03/10 | （自社株買い）取締役会(2021年2月12日)での決議状況(取得期間2021年4月20日～2021年12月31日) |
| 03/10 | 1,276 | 1,276 | 1,255 | 1,267 | -0.78% | 157,000 | 1625億5610万 | +4.45% |
| 03/09 | 1,275 | 1,279 | 1,249 | 1,277 | +2.24% | 246,000 | 1638億3910万 | +5.71% |
| 03/08 | 1,278 | 1,280 | 1,236 | 1,249 | -1.03% | 221,500 | 1602億4670万 | +3.91% |
| 03/05 | 1,250 | 1,263 | 1,237 | 1,262 | +1.12% | 303,600 | 1619億1460万 | +5.43% |
| 03/04 | 1,223 | 1,250 | 1,216 | 1,248 | +1.05% | 266,200 | 1601億1840万 | +4.52% |
| 03/03 | 1,221 | 1,238 | 1,211 | 1,235 | +1.9% | 247,700 | 1584億5050万 | +3.78% |
| 03/02 | 1,215 | 1,220 | 1,199 | 1,212 | -0.57% | 271,800 | 1554億9960万 | +2.02% |
| 03/02 | （空売り報告）三菱UFJモルガン・スタンレー証券 769,200株（0.59%）新規 |
| 03/01 | 1,189 | 1,219 | 1,182 | 1,219 | +5.18% | 331,100 | 1563億9770万 | +2.78% |
| 02/26 | 1,207 | 1,208 | 1,159 | 1,159 | -5.46% | 428,200 | 1486億9970万 | -2.11% |
| 02/25 | 1,245 | 1,245 | 1,220 | 1,226 | -0.89% | 266,700 | 1572億9580万 | +3.46% |
| 02/24 | 1,250 | 1,262 | 1,235 | 1,237 | -0.48% | 341,700 | 1587億710万 | +4.48% |
| 02/22 | （IR情報）16:00 東亞合成グループコーポレートガバナンス基本方針改定のお知らせ(2021年2月22日) |
| 02/22 | 1,245 | 1,258 | 1,238 | 1,243 | +1.3% | 363,200 | 1594億7690万 | +5.25% |
| 02/19 | 1,221 | 1,241 | 1,217 | 1,227 | +1.24% | 399,200 | 1574億2410万 | +4.07% |
| 02/18 | 1,219 | 1,229 | 1,209 | 1,212 | -0.49% | 304,000 | 1554億9960万 | +2.8% |
| 02/17 | 1,213 | 1,232 | 1,213 | 1,218 | +0.5% | 248,000 | 1562億6940万 | +3.31% |
| 02/16 | 1,229 | 1,233 | 1,203 | 1,212 | -1.46% | 357,600 | 1554億9960万 | +2.8% |
| 02/15 | 1,238 | 1,245 | 1,217 | 1,230 | +1.49% | 457,700 | 1578億900万 | +4.41% |
| 02/12 | （IR情報）14:00 自己株式取得に係る事項の決定に関するお知らせ |
| 02/12 | （IR情報）14:00 2020年12月期決算短信〔日本基準〕(連結) |
| 02/12 | 1,156 | 1,230 | 1,156 | 1,212 | +4.94% | 529,600 | 1554億9960万 | +3.06% |
| 02/10 | 1,155 | 1,170 | 1,152 | 1,155 | -0.94% | 220,100 | 1481億8650万 | -1.7% |
| 02/09 | 1,181 | 1,182 | 1,159 | 1,166 | -2.18% | 282,100 | 1495億9780万 | -0.77% |
| 02/08 | 1,180 | 1,196 | 1,175 | 1,192 | +1.79% | 248,200 | 1529億3360万 | +1.36% |
| 02/05 | 1,169 | 1,175 | 1,164 | 1,171 | +0.77% | 169,300 | 1502億3930万 | -0.51% |
| 02/04 | 1,156 | 1,165 | 1,152 | 1,162 | -0.6% | 225,500 | 1490億8460万 | -1.44% |
| 02/03 | 1,171 | 1,176 | 1,159 | 1,169 | +0.52% | 209,600 | 1499億8270万 | -1.18% |
| 02/02 | 1,167 | 1,174 | 1,158 | 1,163 | +1.22% | 289,500 | 1492億1290万 | -1.94% |
| 02/01 | 1,104 | 1,152 | 1,103 | 1,149 | +3.51% | 230,900 | 1474億1670万 | -3.36% |
| 01/29 | 1,145 | 1,155 | 1,110 | 1,110 | -3.14% | 320,900 | 1424億1300万 | -6.88% |
| 01/28 | 1,140 | 1,160 | 1,134 | 1,146 | -1.63% | 464,200 | 1470億3180万 | -4.26% |
| 01/27 | 1,164 | 1,176 | 1,161 | 1,165 | +0.34% | 156,800 | 1494億6950万 | -3.08% |
| 01/26 | 1,167 | 1,173 | 1,160 | 1,161 | -1.28% | 157,000 | 1489億5630万 | -3.65% |
| 01/25 | 1,174 | 1,179 | 1,161 | 1,176 | +1.38% | 168,000 | 1508億8080万 | -2.73% |
| 01/22 | 1,171 | 1,174 | 1,159 | 1,160 | -2.19% | 157,200 | 1488億2800万 | -4.45% |
| 01/21 | 1,190 | 1,208 | 1,183 | 1,186 | +0.17% | 163,500 | 1521億6380万 | -2.71% |
| 01/20 | 1,180 | 1,188 | 1,167 | 1,184 | +0.08% | 238,500 | 1519億720万 | -3.19% |
| 01/19 | 1,196 | 1,199 | 1,183 | 1,183 | 0% | 213,600 | 1517億7890万 | -3.59% |
| 01/18 | 1,180 | 1,186 | 1,175 | 1,183 | -0.84% | 142,000 | 1517億7890万 | -3.9% |
| 01/15 | 1,201 | 1,207 | 1,185 | 1,193 | -1.08% | 234,700 | 1530億6190万 | -3.4% |
| 01/14 | 1,217 | 1,223 | 1,203 | 1,206 | -1.63% | 266,500 | 1547億2980万 | -2.43% |
| 01/13 | 1,216 | 1,230 | 1,207 | 1,226 | +1.32% | 271,800 | 1572億9580万 | -0.97% |
| 01/12 | 1,184 | 1,212 | 1,177 | 1,210 | +1.51% | 258,200 | 1552億4300万 | -2.34% |
| 01/08 | 1,197 | 1,203 | 1,177 | 1,192 | 0% | 397,300 | 1529億3360万 | -3.95% |
| 01/07 | 1,181 | 1,208 | 1,173 | 1,192 | +1.62% | 359,100 | 1529億3360万 | -4.18% |
| 01/06 | 1,172 | 1,185 | 1,168 | 1,173 | +0.43% | 215,200 | 1504億9590万 | -5.78% |
| 01/05 | 1,166 | 1,180 | 1,159 | 1,168 | -0.93% | 276,200 | 1498億5440万 | -6.41% |
| 01/04 | 1,206 | 1,206 | 1,166 | 1,179 | -2.64% | 229,300 | 1512億6570万 | -6.28% |
| 2020 |
| 12/30 | 1,225 | 1,229 | 1,206 | 1,211 | -2.02% | 272,800 | 1598億4751万 | -3.81% |
| 12/29 | 1,221 | 1,238 | 1,217 | 1,236 | -0.64% | 317,200 | 1631億4742万 | -1.75% |
| 12/28 | 1,251 | 1,260 | 1,235 | 1,244 | -0.48% | 193,600 | 1642億339万 | -0.96% |
| 12/25 | 1,243 | 1,251 | 1,239 | 1,250 | +0.97% | 135,000 | 1649億9537万 | -0.32% |
| 12/24 | 1,225 | 1,246 | 1,224 | 1,238 | +1.06% | 178,400 | 1634億1141万 | -1.04% |
| 12/23 | 1,250 | 1,256 | 1,220 | 1,225 | -0.97% | 162,700 | 1616億9546万 | -1.84% |
| 12/22 | 1,245 | 1,250 | 1,233 | 1,237 | -1.98% | 174,000 | 1632億7942万 | -0.72% |
| 12/21 | 1,248 | 1,268 | 1,246 | 1,262 | +0.48% | 232,700 | 1665億7932万 | +1.53% |
| 12/18 | 1,259 | 1,264 | 1,248 | 1,256 | -0.71% | 348,200 | 1657億8735万 | +1.45% |
| 12/17 | （IR情報）17:00 役員の異動に関するお知らせ |
| 12/17 | （IR情報）17:00 自己株式の消却に関するお知らせ |
| 12/17 | 1,286 | 1,289 | 1,257 | 1,265 | -1.63% | 233,500 | 1669億7531万 | +2.43% |
| 12/16 | 1,290 | 1,294 | 1,279 | 1,286 | +0.23% | 136,200 | 1697億4724万 | +4.47% |
| 12/15 | 1,277 | 1,290 | 1,271 | 1,283 | -0.54% | 269,400 | 1693億5125万 | +4.65% |
| 12/14 | 1,292 | 1,309 | 1,283 | 1,290 | 0% | 352,600 | 1702億7522万 | +5.74% |
| 12/11 | 1,281 | 1,292 | 1,270 | 1,290 | +1.34% | 298,300 | 1702億7522万 | +6.35% |
| 12/10 | （自社株買い）取締役会(2020年10月26日)での決議状況(取得期間2020年4月21日～2020年12月31日) |
| 12/10 | 1,282 | 1,293 | 1,261 | 1,273 | -0.55% | 294,200 | 1680億3128万 | +5.56% |
| 12/09 | 1,242 | 1,280 | 1,241 | 1,280 | +3.81% | 232,800 | 1689億5526万 | +6.67% |
| 12/09 | （空売り報告）Societe Generale 272,224株（0.2%）-0.35%義務消失 |
