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Trinseo PLC (TSEOQ) stock

TSEOQOTCPlastic Materials, Synth Resins & Nonvulcan ElastomersFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 6, 2026Score 2/30
$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 trading day, newest first. Adjusted for stock splits, not for dividends.

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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
DateOpenHighLowCloseChangeVolume
Oct 19, 2026$0.004$0.004$0.004$0.004+14.29%0
Oct 16, 2026$0.0035$0.0035$0.0035$0.0035-12.50%280
Oct 15, 2026$0.004$0.004$0.004$0.0040.00%0
Oct 14, 2026$0.004$0.004$0.004$0.0040.00%0
Oct 13, 2026$0.004$0.004$0.004$0.0040.00%0
Oct 12, 2026$0.004$0.004$0.004$0.004+14.29%0
Oct 9, 2026$0.0035$0.0035$0.0035$0.0035-65.00%8,824
Oct 8, 2026$0.01$0.01$0.01$0.010.00%0
Oct 7, 2026$0.01$0.01$0.01$0.010.00%0
Oct 6, 2026$0.0035$0.01$0.0035$0.01-23.08%380
Oct 5, 2026$0.013$0.013$0.013$0.0130.00%0
Oct 2, 2026$0.013$0.013$0.013$0.0130.00%0
Oct 1, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 30, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 29, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 28, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 25, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 24, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 23, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 22, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 21, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 18, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 17, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 16, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 15, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 14, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 11, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 10, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 9, 2026$0.013$0.013$0.013$0.0130.00%0
Sep 8, 2026$0.013$0.013$0.013$0.0130.00%0

Seasonality

TSEOQ return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
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 up5 of 104 of 100 of 103 of 103 of 105 of 104 of 104 of 106 of 104 of 103 of 94 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%
202323.9%-16.5%-10.1%-12.5%-31.5%2.0%39.2%-40.2%-22.4%-24.1%-6.6%44.8%
20222.6%-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%
20198.0%2.3%-9.7%0.1%-18.0%14.9%-7.4%-9.6%22.4%-0.0%-10.6%-2.1%
201814.1%-3.5%-7.0%-1.0%-0.9%-1.9%5.9%3.3%1.5%-30.8%-6.2%-9.4%
20179.7%6.8%-3.0%-0.6%-2.9%6.6%2.9%-4.8%0.3%6.4%3.9%-1.6%