| 2026 |
| 09/30 | 1,226 | 1,234 | 1,215 | 1,223 | -0.16% | 181,900 | - | -2.24% |
| 09/29 | 1,228 | 1,233 | 1,219 | 1,225 | -1.69% | 144,900 | - | -2.23% |
| 09/28 | (IR情報)16:00 人事異動に関するお知らせ |
| 09/28 | 1,269 | 1,270 | 1,246 | 1,246 | -1.19% | 181,700 | - | -0.8% |
| 09/25 | 1,260 | 1,267 | 1,259 | 1,261 | +0.48% | 114,200 | - | +0.32% |
| 09/24 | 1,260 | 1,260 | 1,248 | 1,255 | +1.21% | 111,800 | - | -0.24% |
| 09/18 | 1,262 | 1,266 | 1,240 | 1,240 | -1.27% | 206,400 | - | -1.67% |
| 09/17 | 1,254 | 1,261 | 1,249 | 1,256 | +0.8% | 86,100 | - | -0.55% |
| 09/16 | 1,246 | 1,249 | 1,239 | 1,246 | +1.47% | 65,200 | - | -1.42% |
| 09/15 | 1,210 | 1,228 | 1,210 | 1,228 | +0.74% | 98,900 | - | -2.92% |
| 09/14 | (IR情報)16:00 「TOKYO PACK 2026」出展のお知らせ |
| 09/14 | 1,224 | 1,224 | 1,213 | 1,219 | 0% | 69,700 | - | -3.79% |
| 09/11 | 1,202 | 1,220 | 1,195 | 1,219 | -0.65% | 110,500 | - | -4.02% |
| 09/10 | 1,236 | 1,243 | 1,223 | 1,227 | -1.76% | 76,700 | - | -3.99% |
| 09/09 | 1,222 | 1,254 | 1,218 | 1,249 | +2.21% | 148,700 | - | -2.88% |
| 09/08 | 1,250 | 1,255 | 1,222 | 1,222 | -3.32% | 126,000 | - | -5.42% |
| 09/07 | 1,252 | 1,265 | 1,252 | 1,264 | +0.96% | 69,300 | - | -2.69% |
| 09/04 | 1,247 | 1,256 | 1,236 | 1,252 | +0.32% | 159,300 | - | -3.84% |
| 09/03 | 1,265 | 1,265 | 1,245 | 1,248 | -0.56% | 127,000 | - | -4.37% |
| 09/02 | 1,279 | 1,284 | 1,255 | 1,255 | -3.09% | 154,400 | - | -4.13% |
| 09/01 | (IR情報)16:00 シングルユース製品の国産化のためのパートナーシップ「J-STAC」 東レ株式会社の新規加入について |
| 09/01 | 1,290 | 1,306 | 1,285 | 1,295 | 0% | 112,300 | - | -1.37% |
| 08/31 | 1,279 | 1,301 | 1,271 | 1,295 | +1.17% | 135,600 | - | -1.67% |
| 08/28 | 1,274 | 1,299 | 1,274 | 1,280 | +1.03% | 133,200 | - | -3.03% |
| 08/27 | 1,264 | 1,278 | 1,260 | 1,267 | -0.24% | 101,000 | - | -4.38% |
| 08/26 | 1,262 | 1,274 | 1,260 | 1,270 | +0.63% | 73,100 | - | -4.51% |
| 08/25 | 1,289 | 1,289 | 1,257 | 1,262 | -1.17% | 113,200 | - | -5.54% |
| 08/24 | 1,271 | 1,283 | 1,265 | 1,277 | +0.39% | 162,900 | - | -4.77% |
| 08/21 | 1,267 | 1,275 | 1,250 | 1,272 | -1.17% | 200,200 | - | -5.57% |
| 08/20 | 1,274 | 1,287 | 1,264 | 1,287 | +1.18% | 152,200 | - | -4.67% |
| 08/19 | 1,282 | 1,296 | 1,269 | 1,272 | -2.15% | 248,200 | - | -5.92% |
| 08/18 | 1,311 | 1,318 | 1,295 | 1,300 | -0.84% | 107,500 | - | -3.92% |
| 08/17 | 1,305 | 1,316 | 1,297 | 1,311 | +0.38% | 121,800 | - | -3.18% |
| 08/14 | 1,277 | 1,309 | 1,276 | 1,306 | +2.03% | 160,500 | - | -3.47% |
| 08/13 | 1,274 | 1,288 | 1,271 | 1,280 | +0.79% | 162,100 | - | -5.4% |
| 08/12 | 1,282 | 1,283 | 1,257 | 1,270 | -1.01% | 203,300 | - | -6.27% |
| 08/10 | 1,279 | 1,299 | 1,261 | 1,283 | +0.39% | 255,000 | - | -5.52% |
| 08/07 | 1,335 | 1,351 | 1,277 | 1,278 | -10.32% | 383,000 | - | -6.1% |
| 08/06 | (IR情報)16:00 2027年3月期第1四半期決算補足説明資料 |
| 08/06 | (IR情報)16:00 2027年3月期第1四半期決算短信〔日本基準〕(連結) |
| 08/06 | 1,450 | 1,467 | 1,415 | 1,425 | -0.97% | 191,000 | - | +4.47% |
| 08/05 | (IR情報)16:00 中国現地法人「賽諾世精密材料(無錫)有限公司」開所について |
| 08/05 | (IR情報)14:00 9社連携でプラスチック(容器包装)資源循環の動静脈連携モデル実証を開始(環境省請負事業) |
| 08/05 | 1,400 | 1,440 | 1,398 | 1,439 | +3.53% | 165,300 | - | +5.58% |
| 08/04 | 1,381 | 1,395 | 1,374 | 1,390 | +0.14% | 117,500 | - | +2.21% |
| 08/03 | 1,352 | 1,388 | 1,330 | 1,388 | +2.36% | 222,500 | - | +2.06% |
| 07/31 | 1,347 | 1,361 | 1,314 | 1,356 | +1.88% | 159,700 | - | -0.15% |
| 07/30 | 1,340 | 1,342 | 1,319 | 1,331 | -0.75% | 155,100 | - | -1.99% |
| 07/29 | 1,363 | 1,363 | 1,313 | 1,341 | -1.18% | 217,500 | - | -1.25% |
| 07/28 | 1,383 | 1,404 | 1,347 | 1,357 | -2.65% | 147,000 | - | 0% |
| 07/27 | 1,378 | 1,401 | 1,376 | 1,394 | +1.98% | 123,700 | - | +2.8% |
| 07/24 | 1,381 | 1,396 | 1,358 | 1,367 | -2.84% | 88,500 | - | +0.96% |
| 07/23 | 1,380 | 1,422 | 1,361 | 1,407 | +1.01% | 132,900 | - | +4.07% |
| 07/22 | 1,422 | 1,433 | 1,393 | 1,393 | -1.9% | 206,000 | - | +3.34% |
| 07/21 | 1,394 | 1,429 | 1,375 | 1,420 | +2.38% | 180,700 | - | +5.65% |
| 07/17 | 1,412 | 1,425 | 1,364 | 1,387 | -1.77% | 260,400 | - | +3.51% |
| 07/16 | 1,371 | 1,438 | 1,369 | 1,412 | +3.75% | 270,400 | - | +5.77% |
| 07/15 | 1,332 | 1,368 | 1,331 | 1,361 | +2.95% | 142,600 | - | +2.48% |
| 07/14 | 1,320 | 1,333 | 1,304 | 1,322 | +1.07% | 144,500 | - | -0.08% |
| 07/13 | 1,324 | 1,336 | 1,304 | 1,308 | -0.91% | 122,000 | - | -0.83% |
| 07/10 | 1,316 | 1,335 | 1,309 | 1,320 | +1.54% | 179,200 | - | +0.23% |
| 07/09 | (IR情報)16:00 譲渡制限付株式としての自己株式処分に関するお知らせ |
| 07/09 | 1,311 | 1,317 | 1,292 | 1,300 | -0.23% | 107,800 | - | -1.22% |
| 07/08 | 1,305 | 1,323 | 1,303 | 1,303 | -1.06% | 148,200 | - | -0.91% |
| 07/08 | (自社株買い)取締役会(2025年11月6日)での決議状況(取得期間2025年11月7日~2026年6月30日) |
| 07/07 | 1,352 | 1,356 | 1,317 | 1,317 | -1.79% | 171,000 | - | +0.23% |
| 07/06 | 1,374 | 1,382 | 1,341 | 1,341 | -1.54% | 143,500 | - | +2.21% |
| 07/03 | 1,350 | 1,363 | 1,328 | 1,362 | -0.22% | 164,500 | - | +4.13% |
| 07/02 | (IR情報)16:00 自己株式の取得状況及び取得終了に関するお知らせ |
| 07/02 | 1,413 | 1,417 | 1,356 | 1,365 | -1.3% | 188,800 | - | +4.68% |
| 07/01 | 1,383 | 1,400 | 1,373 | 1,383 | +0.44% | 180,600 | - | +6.3% |
| 06/30 | (IR情報)16:00 人事異動に関するお知らせ |
| 06/30 | 1,380 | 1,387 | 1,359 | 1,377 | -0.72% | 158,400 | - | +6.17% |
| 06/29 | 1,363 | 1,387 | 1,346 | 1,387 | +2.66% | 247,600 | - | +7.19% |
| 06/26 | 1,341 | 1,363 | 1,337 | 1,351 | +0.9% | 178,700 | - | +4.81% |
| 06/25 | 1,358 | 1,358 | 1,333 | 1,339 | +0.75% | 128,400 | - | +4.2% |
| 06/24 | 1,315 | 1,337 | 1,312 | 1,329 | +0.99% | 139,800 | - | +3.67% |
| 06/23 | 1,354 | 1,360 | 1,314 | 1,316 | -2.52% | 171,300 | - | +2.89% |
| 06/22 | 1,350 | 1,365 | 1,343 | 1,350 | +0.97% | 159,300 | - | +5.72% |
| 06/19 | (IR情報)16:00 取締役の選任および退任、執行役員の異動に関するお知らせ |
| 06/19 | 1,338 | 1,350 | 1,324 | 1,337 | +1.21% | 168,900 | - | +5.03% |
| 06/18 | 1,298 | 1,329 | 1,298 | 1,321 | +1.07% | 117,200 | - | +3.93% |
| 06/17 | (IR情報)16:00 「SuMPO/Internal-承認制PCR度」による承認を取得 製品のカーボンフットプリント算定ルールの信頼性を担保 |
| 06/17 | 1,300 | 1,313 | 1,297 | 1,307 | +1.48% | 127,700 | - | +2.91% |
| 06/16 | 1,300 | 1,300 | 1,287 | 1,288 | -1.38% | 69,000 | - | +1.42% |
| 06/15 | 1,300 | 1,320 | 1,295 | 1,306 | +2.11% | 91,800 | - | +2.59% |
| 06/12 | 1,244 | 1,285 | 1,241 | 1,279 | +3.81% | 215,300 | - | +0.55% |
| 06/11 | 1,227 | 1,239 | 1,194 | 1,232 | +0.24% | 176,500 | - | -3.52% |
| 06/10 | (IR情報)16:00 (訂正・数値データ訂正)「2026年3月期決算短信〔日本基準〕(連結)」の一部訂正について |
| 06/10 | 1,242 | 1,249 | 1,218 | 1,229 | -0.57% | 140,500 | - | -4.28% |
| 06/09 | 1,272 | 1,279 | 1,231 | 1,236 | -1.9% | 244,300 | - | -4.11% |
| 06/08 | (自社株買い)取締役会(2025年11月6日)での決議状況(取得期間2025年11月7日~2026年6月30日) |
| 06/08 | 1,258 | 1,271 | 1,241 | 1,260 | -2.17% | 249,200 | - | -2.7% |
| 06/05 | 1,275 | 1,292 | 1,271 | 1,288 | +0.78% | 119,700 | - | -0.92% |
| 06/04 | (IR情報)16:00 『「MONOSOLUTIONS」ポリエチレン単一素材つめかえパウチ』 経済産業省の「プラスチック使用製品設計認定制度」において フィルム容器で初めての認定を取得 |
| 06/04 | 1,269 | 1,283 | 1,260 | 1,278 | +0.08% | 103,200 | - | -1.92% |
| 06/03 | (IR情報)16:00 自己株式の取得状況に関するお知らせ |
| 06/03 | 1,275 | 1,290 | 1,268 | 1,277 | +1.92% | 112,300 | - | -2.37% |
| 06/02 | 1,244 | 1,261 | 1,238 | 1,253 | -0.08% | 176,400 | - | -4.57% |
| 06/01 | 1,258 | 1,264 | 1,243 | 1,254 | -1.03% | 170,300 | - | -5% |
| 05/29 | 1,301 | 1,304 | 1,267 | 1,267 | -1.78% | 155,700 | - | -4.52% |
| 05/28 | 1,287 | 1,291 | 1,256 | 1,290 | +0.55% | 138,800 | - | -3.23% |
| 05/27 | 1,293 | 1,306 | 1,271 | 1,283 | -1.16% | 123,100 | - | -4.11% |
| 05/26 | 1,261 | 1,302 | 1,260 | 1,298 | +3.1% | 156,400 | - | -3.42% |
| 05/25 | 1,284 | 1,293 | 1,259 | 1,259 | -0.08% | 211,000 | - | -6.67% |
| 05/22 | 1,277 | 1,277 | 1,255 | 1,260 | -0.32% | 101,100 | - | -7.01% |
| 05/21 | (5%ルール)シュローダー・インベストメント・マネジメント(6.38%)シュローダー・インベストメント・マネージメント・…(0.24%) |
| 05/21 | 1,263 | 1,286 | 1,263 | 1,264 | +0.96% | 106,600 | - | -7.13% |
| 05/20 | 1,249 | 1,255 | 1,235 | 1,252 | -0.48% | 163,100 | - | -8.41% |
| 05/19 | 1,268 | 1,293 | 1,258 | 1,258 | +0.64% | 190,000 | - | -8.31% |
| 05/18 | 1,271 | 1,274 | 1,248 | 1,250 | -2.19% | 142,400 | - | -9.22% |
| 05/15 | 1,320 | 1,324 | 1,267 | 1,278 | -1.84% | 147,800 | - | -7.46% |
| 05/14 | 1,318 | 1,334 | 1,302 | 1,302 | -1.36% | 133,100 | - | -5.92% |
| 05/13 | 1,351 | 1,355 | 1,303 | 1,320 | -2.87% | 214,100 | - | -4.62% |
| 05/13 | (自社株買い)取締役会(2025年11月6日)での決議状況(取得期間2025年11月7日~2026年6月30日) |
| 05/12 | 1,307 | 1,422 | 1,307 | 1,359 | +7.35% | 476,800 | - | -1.81% |
| 05/11 | 1,287 | 1,319 | 1,255 | 1,266 | -10.21% | 513,600 | - | -8.46% |
| 05/08 | (IR情報)16:00 2026年3月期決算補足説明資料 |
| 05/08 | (IR情報)16:00 2026年3月期決算短信〔日本基準〕(連結) |
| 05/08 | 1,417 | 1,426 | 1,379 | 1,410 | -0.14% | 240,900 | - | +1.88% |
| 05/07 | (IR情報)16:16 自己株式の取得状況に関するお知らせ |
| 05/07 | 1,389 | 1,430 | 1,377 | 1,412 | +3.82% | 163,000 | - | +2.39% |
| 05/01 | (IR情報)17:00 海外子会社(インド)の設立および営業開始に関するお知らせ |