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Westlake Corp (WLK) stock

WLKNYSEIndustrial Organic ChemicalsFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026Score 9/3039% below fair value
$68.28+2.27 (+3.44%)

Close on Oct 30, 2026Market cap $8.73BP/E –Yield 3.09%

Price history

Westlake share prices for every week, newest first. Adjusted for stock splits, not for dividends.

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Close, Oct 30, 2026
$68.28
+3.44% on the day
52-week range
$56.33 – $124.23
-45.0% from the high
Change over 52 weeks
-0.0%
From $68.29 on Oct 30, 2025
Average volume
977,424
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 26, 2026$64.56$68.35$64.56$68.28+5.76%4,706,931
Oct 19, 2026$63.16$65.29$60.36$64.56+1.94%4,543,931
Oct 12, 2026$61.86$64.39$60.99$63.33+1.67%4,036,440
Oct 5, 2026$63.24$65.86$59.84$62.29-1.91%5,066,075
Sep 28, 2026$67.65$67.75$58.95$63.50-6.22%6,900,835
Sep 21, 2026$69.40$70.30$65.66$67.71-1.97%3,006,949
Sep 14, 2026$71.05$72.48$68.55$69.07-2.46%3,584,839
Sep 8, 2026$75.56$76.14$70.44$70.81-5.32%2,833,499
Aug 31, 2026$76.05$77.45$73.45$74.79-1.22%3,041,399
Aug 24, 2026$78.67$79.18$72.90$75.71-4.08%3,323,176
Aug 17, 2026$79.05$80.58$76.45$78.93-0.78%4,008,122
Aug 10, 2026$77.26$80.98$76.62$79.55+2.68%4,508,020
Aug 3, 2026$70.16$80.64$68.70$77.47+9.89%8,840,622
Jul 27, 2026$73.22$74.32$68.48$70.50-4.50%6,518,613
Jul 20, 2026$77.08$78.33$73.44$73.82-4.91%4,316,551
Jul 13, 2026$76.71$79.84$75.28$77.63+2.83%3,432,508
Jul 6, 2026$73.95$78.60$72.71$75.49+0.96%6,256,329
Jun 29, 2026$76.44$76.53$71.23$74.77-2.41%5,588,151
Jun 22, 2026$79.29$79.70$73.77$76.62-4.56%7,512,271
Jun 15, 2026$87.65$88.76$80.09$80.28-9.29%4,210,369
Jun 8, 2026$84.38$89.47$83.75$88.50+4.56%4,581,198
Jun 1, 2026$87.50$88.99$82.98$84.64-2.52%4,114,030
May 26, 2026$88.77$89.39$86.08$86.83-2.00%3,539,843
May 18, 2026$90.22$93.18$86.54$88.60+0.01%5,201,799
May 11, 2026$94.88$99.51$88.33$88.59-5.60%6,752,971
May 4, 2026$115.52$116.26$93.42$93.85-18.38%7,994,537
Apr 27, 2026$111.91$117.05$109.14$114.99+3.93%4,520,004
Apr 20, 2026$111.72$117.66$109.68$110.64-1.75%4,863,271
Apr 13, 2026$120.00$121.94$110.79$112.61-4.87%5,334,005
Apr 6, 2026$117.61$124.23$113.33$118.37-0.86%5,845,125
Mar 30, 2026$115.11$120.00$113.59$119.40+5.39%5,252,771
Mar 23, 2026$107.79$116.19$107.00$113.29+6.76%5,866,274
Mar 16, 2026$111.25$115.78$105.48$106.12-5.28%6,331,464
Mar 9, 2026$102.18$116.46$100.54$112.04+8.58%6,424,208
Mar 2, 2026$103.32$112.21$99.34$103.19-2.08%7,846,838
Feb 23, 2026$93.84$107.99$91.76$105.38+11.63%7,567,709
Feb 17, 2026$99.58$101.30$92.69$94.40-5.68%4,971,290
Feb 9, 2026$94.10$103.00$93.55$100.08+4.33%6,057,902
Feb 2, 2026$79.89$98.06$78.61$95.93+20.94%8,916,067
Jan 26, 2026$85.59$85.95$77.58$79.32-6.92%7,300,236
Jan 20, 2026$86.30$89.85$83.30$85.22-3.02%5,201,417
Jan 12, 2026$83.00$91.08$82.63$87.87+5.61%7,875,488
Jan 5, 2026$73.90$83.30$73.50$83.20+12.20%7,386,247
Dec 29, 2025$73.01$75.45$72.69$74.15+0.54%3,890,638
Dec 22, 2025$72.57$74.60$71.87$73.75+1.74%3,274,504
Dec 15, 2025$76.02$76.33$71.27$72.49-2.57%11,438,845
Dec 8, 2025$67.80$75.40$66.92$74.40+9.38%8,701,905
Dec 1, 2025$65.50$70.34$65.50$68.02+1.81%8,738,930
Nov 24, 2025$58.86$66.97$58.62$66.81+13.18%8,401,229
Nov 17, 2025$62.56$62.77$56.33$59.03-5.64%8,161,793
Nov 10, 2025$65.85$66.28$62.30$62.56-3.68%6,655,285
Nov 3, 2025$69.00$70.62$63.89$64.95-5.61%5,362,011

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average3.6%3.9%-0.3%0.1%-3.3%-0.6%1.4%1.5%-2.4%-1.1%5.9%2.2%
Months up6 of 105 of 106 of 104 of 105 of 105 of 105 of 106 of 105 of 105 of 106 of 96 of 9
20267.3%32.9%11.4%-1.3%-24.2%-15.9%-3.4%7.2%-17.0%9.6%
2025-0.3%-1.7%-10.5%-7.6%-22.6%6.9%4.4%11.5%-12.3%-10.7%-2.1%10.7%
2024-1.2%0.6%10.2%-3.6%9.3%-9.8%2.1%-1.3%3.3%-12.2%-2.3%-10.7%
202319.7%-2.7%-2.7%-1.9%-8.4%14.9%15.1%-4.4%-4.8%-7.5%11.7%9.0%
20221.6%12.1%11.9%2.6%4.6%-25.8%-0.7%1.7%-11.9%11.2%11.8%-4.7%
2021-6.3%11.9%4.1%5.7%7.7%-10.7%-8.0%5.7%4.3%6.8%-4.2%4.5%
2020-12.8%-8.3%-31.7%13.8%10.4%12.5%1.6%9.4%6.6%7.0%11.5%8.6%
201911.7%-5.1%-2.9%2.8%-17.5%21.2%-2.7%-12.9%11.8%-3.6%9.1%2.1%
20185.7%-3.7%2.7%-3.8%8.4%-7.0%-0.4%-11.6%-12.1%-14.2%2.0%-8.7%
201710.6%2.8%4.1%-5.8%-1.0%7.7%6.3%9.6%8.0%2.2%15.6%8.8%