Trinseo PLC (TSEOQ) stock
TSEOQOTCPlastic Materials, Synth Resins & Nonvulcan ElastomersFiscal year ends December 31
$0.00+0.00 (+14.29%)
Close on Oct 19, 2026Market cap $146.40KP/E –Yield 500.00%
Price history
Trinseo share prices for every month, newest first. Adjusted for stock splits, not for dividends.
Close, Oct 19, 2026
$0.004
+14.29% on the day
52-week range
$0.0014 – $1.94
-99.8% from the high
Change over 52 weeks
-99.8%
From $1.88 on Oct 17, 2025
Average volume
5,936
Shares a day, last 90 sessions
| Month | Open | High | Low | Close | Change | Volume |
|---|---|---|---|---|---|---|
| Oct 2026 | $0.013 | $0.013 | $0.0035 | $0.004 | -69.23% | 9,484 |
| Sep 2026 | $0.013 | $0.013 | $0.013 | $0.013 | 0.00% | 769 |
| Aug 2026 | $0.002 | $0.013 | $0.0016 | $0.013 | +712.50% | 38,194 |
| Jul 2026 | $0.002 | $0.013 | $0.0014 | $0.0016 | -20.00% | 130,024 |
| Jun 2026 | $0.01 | $0.09 | $0.0016 | $0.002 | -80.00% | 369,806 |
| May 2026 | $0.10 | $0.25 | $0.01 | $0.01 | -90.00% | 236,667 |
| Apr 2026 | $0.105 | $0.25 | $0.10 | $0.10 | -4.76% | 1,377,300 |
| Mar 2026 | $0.23 | $0.23 | $0.003 | $0.105 | -54.35% | 13,475,200 |
| Feb 2026 | $0.43 | $0.506 | $0.23 | $0.23 | -48.89% | 14,107,500 |
| Jan 2026 | $0.50 | $0.95 | $0.43 | $0.45 | -9.46% | 22,568,200 |
| Dec 2025 | $0.95 | $0.96 | $0.451 | $0.497 | -48.97% | 28,606,400 |
| Nov 2025 | $1.46 | $1.49 | $0.735 | $0.974 | -33.29% | 9,124,900 |
| Oct 2025 | $2.33 | $2.41 | $1.32 | $1.46 | -37.87% | 9,601,700 |
| Sep 2025 | $2.36 | $2.73 | $2.26 | $2.35 | -2.08% | 5,191,500 |
| Aug 2025 | $2.63 | $2.78 | $1.90 | $2.40 | -10.11% | 7,407,400 |
| Jul 2025 | $3.08 | $3.34 | $2.63 | $2.67 | -14.42% | 7,700,400 |
| Jun 2025 | $3.02 | $3.85 | $2.92 | $3.12 | +2.97% | 9,828,300 |
| May 2025 | $4.00 | $4.42 | $2.34 | $3.03 | -23.87% | 8,929,000 |
| Apr 2025 | $3.68 | $4.13 | $2.71 | $3.98 | +8.15% | 5,916,100 |
| Mar 2025 | $5.00 | $5.11 | $3.51 | $3.68 | -25.20% | 7,345,700 |
| Feb 2025 | $3.99 | $5.99 | $3.78 | $4.92 | +18.84% | 6,356,700 |
| Jan 2025 | $5.16 | $5.46 | $3.90 | $4.14 | -18.82% | 5,336,900 |
| Dec 2024 | $4.32 | $6.85 | $3.91 | $5.10 | +17.78% | 11,080,600 |
| Nov 2024 | $4.65 | $4.73 | $3.15 | $4.33 | -6.28% | 7,147,100 |
| Oct 2024 | $5.06 | $7.05 | $4.62 | $4.62 | -9.59% | 9,095,900 |
| Sep 2024 | $4.28 | $6.03 | $3.04 | $5.11 | +17.47% | 8,984,600 |
| Aug 2024 | $2.94 | $4.78 | $2.16 | $4.35 | +50.52% | 12,303,200 |
| Jul 2024 | $2.40 | $3.13 | $1.94 | $2.89 | +25.11% | 12,179,300 |
| Jun 2024 | $3.88 | $4.04 | $2.30 | $2.31 | -39.69% | 17,268,800 |
| May 2024 | $2.61 | $3.92 | $2.59 | $3.83 | +46.74% | 8,673,700 |
| Apr 2024 | $3.91 | $4.45 | $2.61 | $2.61 | -30.95% | 7,688,200 |
| Mar 2024 | $4.55 | $5.31 | $3.23 | $3.78 | -16.00% | 9,218,700 |
| Feb 2024 | $6.07 | $6.29 | $4.22 | $4.50 | -25.37% | 7,620,800 |
| Jan 2024 | $8.29 | $8.58 | $5.21 | $6.03 | -27.96% | 7,048,000 |
| Dec 2023 | $5.78 | $8.83 | $5.56 | $8.37 | +44.81% | 9,003,500 |
| Nov 2023 | $6.13 | $7.45 | $5.55 | $5.78 | -6.62% | 10,373,500 |
| Oct 2023 | $8.10 | $8.42 | $5.48 | $6.19 | -24.24% | 14,363,700 |
| Sep 2023 | $10.59 | $11.22 | $7.43 | $8.17 | -22.41% | 33,637,400 |
| Aug 2023 | $17.56 | $17.70 | $10.49 | $10.53 | -40.24% | 10,990,700 |
| Jul 2023 | $12.69 | $18.63 | $12.16 | $17.62 | +39.07% | 9,299,100 |
| Jun 2023 | $12.46 | $16.10 | $11.87 | $12.67 | +2.01% | 9,080,900 |
| May 2023 | $18.21 | $18.71 | $11.79 | $12.42 | -31.46% | 12,445,400 |
| Apr 2023 | $21.04 | $22.67 | $17.22 | $18.12 | -13.09% | 6,177,000 |
| Mar 2023 | $23.04 | $25.01 | $18.87 | $20.85 | -10.05% | 8,800,700 |
| Feb 2023 | $27.44 | $30.54 | $23.16 | $23.18 | -16.47% | 8,510,500 |
| Jan 2023 | $23.15 | $27.86 | $23.05 | $27.75 | +22.19% | 5,903,300 |
| Dec 2022 | $24.61 | $26.20 | $22.02 | $22.71 | -7.87% | 7,741,200 |
| Nov 2022 | $19.41 | $28.17 | $19.02 | $24.65 | +30.98% | 12,638,000 |
| Oct 2022 | $18.50 | $20.31 | $17.54 | $18.82 | +2.73% | 11,017,700 |
| Sep 2022 | $26.15 | $28.19 | $17.88 | $18.32 | -30.95% | 10,398,000 |
| Aug 2022 | $35.51 | $35.96 | $26.51 | $26.53 | -25.83% | 10,827,800 |
| Jul 2022 | $37.99 | $43.99 | $33.14 | $35.77 | -6.99% | 9,754,200 |
| Jun 2022 | $47.64 | $49.29 | $35.77 | $38.46 | -18.67% | 8,585,700 |
| May 2022 | $47.64 | $51.38 | $40.72 | $47.29 | -0.34% | 7,479,800 |
| Apr 2022 | $48.42 | $53.93 | $44.40 | $47.45 | -0.98% | 8,302,200 |
| Mar 2022 | $51.63 | $51.77 | $43.24 | $47.92 | -7.78% | 11,713,100 |
| Feb 2022 | $53.64 | $59.73 | $49.63 | $51.96 | -2.95% | 6,490,300 |
| Jan 2022 | $53.37 | $58.51 | $50.38 | $53.54 | +2.06% | 6,881,000 |
| Dec 2021 | $48.91 | $53.99 | $46.54 | $52.46 | +11.07% | 8,186,900 |
| Nov 2021 | $56.35 | $60.00 | $46.15 | $47.23 | -15.75% | 6,441,900 |
| Oct 2021 | $54.18 | $61.63 | $54.08 | $56.06 | +3.85% | 6,729,900 |
| Sep 2021 | $52.06 | $56.76 | $45.70 | $53.98 | +3.95% | 8,988,500 |
| Aug 2021 | $54.57 | $56.39 | $44.20 | $51.93 | -4.47% | 7,904,500 |
| Jul 2021 | $60.84 | $61.10 | $48.66 | $54.36 | -9.16% | 6,518,400 |
| Jun 2021 | $66.45 | $68.50 | $55.59 | $59.84 | -7.85% | 8,275,300 |
| May 2021 | $62.84 | $70.25 | $61.88 | $64.94 | +4.89% | 6,820,800 |
| Apr 2021 | $64.02 | $67.13 | $61.26 | $61.91 | -2.76% | 5,548,300 |
| Mar 2021 | $66.48 | $76.49 | $60.46 | $63.67 | -1.61% | 12,038,300 |
| Feb 2021 | $51.41 | $67.60 | $51.13 | $64.71 | +27.31% | 7,874,200 |
| Jan 2021 | $51.75 | $57.40 | $49.24 | $50.83 | -0.74% | 7,904,700 |
| Dec 2020 | $39.01 | $52.69 | $38.09 | $51.21 | +34.80% | 10,138,000 |
| Nov 2020 | $32.41 | $41.65 | $31.57 | $37.99 | +19.39% | 11,984,700 |
| Oct 2020 | $25.62 | $35.44 | $24.92 | $31.82 | +24.10% | 11,790,400 |
| Sep 2020 | $24.75 | $29.64 | $24.51 | $25.64 | +2.93% | 9,666,500 |
| Aug 2020 | $22.08 | $27.54 | $22.00 | $24.91 | +14.79% | 7,816,500 |
| Jul 2020 | $22.23 | $27.25 | $20.31 | $21.70 | -2.08% | 14,909,000 |
| Jun 2020 | $20.14 | $27.43 | $19.91 | $22.16 | +7.68% | 15,628,400 |
| May 2020 | $19.59 | $23.48 | $15.76 | $20.58 | +0.64% | 17,664,200 |
| Apr 2020 | $17.44 | $22.83 | $16.33 | $20.45 | +12.92% | 9,581,400 |
| Mar 2020 | $22.00 | $23.18 | $14.16 | $18.11 | -17.23% | 16,973,300 |
| Feb 2020 | $28.07 | $31.11 | $20.50 | $21.88 | -23.82% | 10,067,600 |
| Jan 2020 | $37.62 | $37.62 | $28.44 | $28.72 | -22.82% | 8,292,900 |
| Dec 2019 | $38.25 | $39.07 | $34.58 | $37.21 | -2.05% | 6,768,400 |
| Nov 2019 | $43.15 | $50.14 | $37.87 | $37.99 | -10.61% | 10,205,400 |
| Oct 2019 | $43.32 | $46.25 | $37.57 | $42.50 | -1.05% | 8,307,800 |
| Sep 2019 | $34.14 | $45.25 | $33.92 | $42.95 | +22.40% | 12,411,100 |
| Aug 2019 | $38.60 | $39.08 | $27.36 | $35.09 | -9.59% | 22,780,000 |
| Jul 2019 | $42.36 | $42.58 | $36.40 | $38.81 | -8.34% | 7,845,500 |
| Jun 2019 | $36.99 | $42.84 | $36.99 | $42.34 | +14.93% | 6,213,100 |
| May 2019 | $45.06 | $47.63 | $36.65 | $36.84 | -18.04% | 8,221,700 |
| Apr 2019 | $45.94 | $48.76 | $44.45 | $44.95 | -0.77% | 5,369,000 |
| Mar 2019 | $50.54 | $51.59 | $43.40 | $45.30 | -9.74% | 6,638,800 |
| Feb 2019 | $49.12 | $52.34 | $46.23 | $50.19 | +2.32% | 5,962,500 |
| Jan 2019 | $44.53 | $51.68 | $42.86 | $49.05 | +7.14% | 8,899,000 |
| Dec 2018 | $51.83 | $52.95 | $42.10 | $45.78 | -9.40% | 9,282,100 |
| Nov 2018 | $54.43 | $60.15 | $44.06 | $50.53 | -6.22% | 12,484,800 |
| Oct 2018 | $78.75 | $82.18 | $50.20 | $53.88 | -31.19% | 13,884,300 |
| Sep 2018 | $76.90 | $79.40 | $73.05 | $78.30 | +1.49% | 4,851,100 |
| Aug 2018 | $74.65 | $80.00 | $70.55 | $77.15 | +3.28% | 6,143,100 |
| Jul 2018 | $70.40 | $74.75 | $69.70 | $74.70 | +5.29% | 4,851,200 |
| Jun 2018 | $72.95 | $76.60 | $69.30 | $70.95 | -1.87% | 5,396,700 |
| May 2018 | $72.55 | $77.80 | $71.30 | $72.30 | -0.89% | 6,836,800 |
| Apr 2018 | $74.00 | $79.58 | $70.10 | $72.95 | -1.49% | 8,218,500 |
| Mar 2018 | $79.65 | $82.60 | $73.25 | $74.05 | -6.97% | 8,276,800 |
| Feb 2018 | $82.10 | $84.90 | $71.35 | $79.60 | -3.46% | 7,390,000 |
| Jan 2018 | $72.80 | $85.35 | $72.00 | $82.45 | +13.57% | 6,450,500 |
| Dec 2017 | $74.10 | $74.80 | $66.95 | $72.60 | -1.63% | 6,601,400 |
| Nov 2017 | $71.65 | $75.20 | $69.05 | $73.80 | +3.94% | 7,615,600 |
| Oct 2017 | $67.00 | $73.40 | $66.20 | $71.00 | +5.81% | 13,352,900 |
| Sep 2017 | $67.35 | $70.30 | $65.90 | $67.10 | +0.30% | 10,824,400 |
| Aug 2017 | $70.50 | $72.05 | $57.70 | $66.90 | -4.84% | 18,080,200 |
| Jul 2017 | $69.30 | $71.30 | $67.05 | $70.30 | +2.33% | 9,712,400 |
| Jun 2017 | $65.05 | $70.15 | $63.15 | $68.70 | +6.59% | 13,792,000 |
| May 2017 | $66.35 | $67.30 | $59.55 | $64.45 | -2.94% | 14,845,600 |
| Apr 2017 | $67.30 | $69.18 | $63.35 | $66.40 | -1.04% | 10,497,000 |
| Mar 2017 | $69.90 | $72.40 | $62.54 | $67.10 | -2.96% | 13,266,300 |
| Feb 2017 | $64.95 | $72.60 | $64.95 | $69.15 | +6.80% | 14,612,500 |
| Jan 2017 | $60.15 | $65.70 | $59.25 | $64.75 | +9.19% | 10,583,900 |
| Dec 2016 | $59.15 | $62.30 | $57.70 | $59.30 | +1.28% | 12,139,400 |
| Nov 2016 | $52.60 | $59.85 | $44.70 | $58.55 | +11.63% | 21,452,700 |
| Oct 2016 | $56.55 | $57.28 | $51.26 | $52.45 | -7.27% | 16,606,100 |
| Sep 2016 | $57.86 | $59.27 | $51.01 | $56.56 | -2.25% | 24,697,900 |
| Aug 2016 | $49.89 | $60.02 | $48.29 | $57.86 | +16.21% | 20,113,000 |
| Jul 2016 | $43.06 | $52.25 | $41.60 | $49.79 | +15.98% | 10,021,100 |
| Jun 2016 | $46.89 | $49.72 | $39.45 | $42.93 | -8.83% | 17,234,300 |
| May 2016 | $42.99 | $48.28 | $40.40 | $47.09 | +10.05% | 23,866,700 |
| Apr 2016 | $36.53 | $44.63 | $36.19 | $42.79 | +16.25% | 12,168,800 |
| Mar 2016 | $30.10 | $39.23 | $29.34 | $36.81 | +23.48% | 16,076,700 |
| Feb 2016 | $23.54 | $29.99 | $22.38 | $29.81 | +25.30% | 3,445,600 |
| Jan 2016 | $27.75 | $28.14 | $21.92 | $23.79 | -15.64% | 4,064,500 |
| Dec 2015 | $28.66 | $29.85 | $25.05 | $28.20 | -1.26% | 3,301,300 |
| Nov 2015 | $32.38 | $32.68 | $26.55 | $28.56 | -11.99% | 4,533,900 |
| Oct 2015 | $25.46 | $32.96 | $24.80 | $32.45 | +28.51% | 5,195,500 |
| Sep 2015 | $28.06 | $28.52 | $23.68 | $25.25 | -13.35% | 5,519,100 |
| Aug 2015 | $24.42 | $33.69 | $24.29 | $29.14 | +19.62% | 5,930,500 |
| Jul 2015 | $26.99 | $27.64 | $23.46 | $24.36 | -9.24% | 4,303,000 |
| Jun 2015 | $29.44 | $30.44 | $25.99 | $26.84 | -8.11% | 6,324,900 |
| May 2015 | $22.92 | $30.11 | $21.72 | $29.21 | +28.28% | 6,191,400 |
| Apr 2015 | $19.76 | $23.63 | $19.42 | $22.77 | +15.00% | 3,064,400 |
| Mar 2015 | $18.06 | $20.76 | $17.89 | $19.80 | +9.15% | 2,487,700 |
| Feb 2015 | $15.36 | $18.49 | $15.03 | $18.14 | +18.95% | 1,416,500 |
| Jan 2015 | $17.48 | $17.65 | $14.14 | $15.25 | -12.61% | 1,754,200 |
| Dec 2014 | $15.56 | $18.84 | $15.00 | $17.45 | +13.61% | 3,160,500 |
| Nov 2014 | $14.41 | $16.36 | $11.92 | $15.36 | +6.30% | 3,731,200 |
| Oct 2014 | $15.80 | $15.80 | $13.34 | $14.45 | -8.14% | 5,172,900 |
| Sep 2014 | $19.66 | $19.70 | $15.54 | $15.73 | -19.99% | 3,792,100 |
| Aug 2014 | $16.54 | $20.26 | $15.98 | $19.66 | +17.94% | 2,460,300 |
| Jul 2014 | $20.85 | $21.78 | $15.66 | $16.67 | -19.86% | 3,757,500 |
| Jun 2014 | $20.65 | $22.99 | $20.00 | $20.80 | – | 9,103,200 |
Seasonality
TSEOQ return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | -2.0% | -6.6% | -15.2% | -2.9% | -11.5% | -11.4% | 1.7% | 68.6% | -0.6% | -13.1% | -2.7% | 4.3% |
| Months up | 5 of 10 | 4 of 10 | 0 of 10 | 3 of 10 | 3 of 10 | 5 of 10 | 4 of 10 | 4 of 10 | 6 of 10 | 4 of 10 | 3 of 9 | 4 of 9 |
| 2026 | -9.5% | -48.9% | -54.3% | -4.8% | -90.0% | -80.0% | -20.0% | 712.5% | 0.0% | -69.2% | ||
| 2025 | -18.6% | 18.8% | -25.2% | 8.5% | -23.9% | 3.0% | -14.1% | -10.1% | -2.1% | -37.9% | -33.3% | -49.0% |
| 2024 | -27.9% | -25.4% | -16.0% | -30.8% | 46.7% | -39.7% | 25.7% | 50.5% | 17.5% | -9.4% | -6.3% | 17.8% |
| 2023 | 23.9% | -16.5% | -10.1% | -12.5% | -31.5% | 2.0% | 39.2% | -40.2% | -22.4% | -24.1% | -6.6% | 44.8% |
| 2022 | 2.6% | -3.0% | -7.8% | -0.3% | -0.3% | -18.7% | -6.2% | -25.8% | -30.9% | 4.4% | 31.0% | -7.9% |
| 2021 | -0.6% | 27.3% | -1.6% | -2.6% | 4.9% | -7.9% | -9.0% | -4.5% | 4.6% | 3.9% | -15.8% | 11.1% |
| 2020 | -21.9% | -23.8% | -17.2% | 15.1% | 0.6% | 7.7% | -0.3% | 14.8% | 2.9% | 25.9% | 19.4% | 34.8% |
| 2019 | 8.0% | 2.3% | -9.7% | 0.1% | -18.0% | 14.9% | -7.4% | -9.6% | 22.4% | -0.0% | -10.6% | -2.1% |
| 2018 | 14.1% | -3.5% | -7.0% | -1.0% | -0.9% | -1.9% | 5.9% | 3.3% | 1.5% | -30.8% | -6.2% | -9.4% |
| 2017 | 9.7% | 6.8% | -3.0% | -0.6% | -2.9% | 6.6% | 2.9% | -4.8% | 0.3% | 6.4% | 3.9% | -1.6% |