If you invested $1000 in Westlake Corporation (WLK) 10 years ago, it would be worth $1,619.25 as of September 12, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $877.66, while $1000 invested 1 year ago would be worth $814.66. This corresponds to total returns of 61.93%, -12.23%, -18.53%, respectively, with annualized returns of 4.93%, -2.58%, -18.53%.
Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.
Date Range:
| Date | Open | Close | Adj Close | High | Low | Volume |
|---|---|---|---|---|---|---|
| September 11, 2026 | 71.94 | 70.81 | 70.81 | 72.5 | 70.44 | 533,785 |
| September 10, 2026 | 71.87 | 71.62 | 71.62 | 73.75 | 70.69 | 854,135 |
| September 09, 2026 | 72.7 | 71.78 | 71.78 | 73.39 | 70.74 | 846,697 |
| September 08, 2026 | 75.56 | 74.75 | 74.75 | 76.14 | 74.63 | 561,114 |
| September 04, 2026 | 74.05 | 74.79 | 74.79 | 75.56 | 73.73 | 570,442 |
| September 03, 2026 | 77.19 | 74.6 | 74.6 | 77.44 | 74.51 | 594,986 |
| September 02, 2026 | 73.6 | 76.27 | 76.27 | 76.82 | 73.6 | 737,249 |
| September 01, 2026 | 75.02 | 74.23 | 74.23 | 75.59 | 73.44 | 577,000 |
| August 31, 2026 | 76.05 | 75.07 | 75.07 | 76.52 | 74.28 | 561,384 |
| August 28, 2026 | 74.72 | 75.71 | 75.71 | 76.02 | 73.92 | 731,523 |
| August 27, 2026 | 74.22 | 73.93 | 73.93 | 74.78 | 72.91 | 586,206 |
| August 26, 2026 | 74.47 | 74.61 | 74.61 | 74.93 | 72.9 | 800,105 |
| August 25, 2026 | 75.52 | 74.8 | 74.8 | 75.67 | 74.6 | 536,471 |
| August 24, 2026 | 78.67 | 76.49 | 76.49 | 79.18 | 76.19 | 630,390 |
| August 21, 2026 | 79.13 | 78.93 | 78.93 | 80.09 | 78.81 | 746,213 |
| August 20, 2026 | 78.58 | 78.85 | 78.85 | 80.19 | 78.01 | 681,440 |
| August 19, 2026 | 78.39 | 79.45 | 79.45 | 80.58 | 77.66 | 772,160 |
| August 18, 2026 | 78.28 | 77.52 | 77.52 | 79.04 | 76.45 | 865,074 |
| August 17, 2026 | 79.05 | 78.21 | 78.21 | 79.5 | 77.31 | 943,228 |
| August 14, 2026 | 80.66 | 79.55 | 79.55 | 80.86 | 79.37 | 834,100 |
| August 13, 2026 | 78.49 | 80.19 | 80.19 | 80.35 | 78 | 617,736 |
| August 12, 2026 | 80.38 | 79.17 | 79.17 | 80.41 | 78.03 | 734,237 |
| August 11, 2026 | 78.82 | 80.84 | 80.84 | 80.98 | 78.82 | 1.02M |
| August 10, 2026 | 77.26 | 79.09 | 79.09 | 79.31 | 76.61 | 1.3M |
| August 07, 2026 | 76.95 | 77.47 | 77.47 | 79.15 | 76.33 | 918,773 |
| August 06, 2026 | 79.77 | 77.47 | 77.47 | 80.57 | 77.35 | 897,235 |
| August 05, 2026 | 79.42 | 78.74 | 78.74 | 79.77 | 75.48 | 1.79M |
| August 04, 2026 | 72.86 | 80.63 | 80.63 | 80.64 | 72.72 | 3.01M |
| August 03, 2026 | 70.16 | 69.89 | 69.89 | 71 | 68.7 | 2.22M |
| July 31, 2026 | 71.03 | 70.5 | 70.5 | 71.5 | 68.48 | 1.5M |
| July 30, 2026 | 72.52 | 71.72 | 71.72 | 72.89 | 70.98 | 1.38M |
| July 29, 2026 | 72.88 | 72.25 | 72.25 | 73.01 | 71.26 | 1.4M |
| July 28, 2026 | 73.17 | 72.16 | 72.16 | 74.32 | 71.89 | 883,733 |
| July 27, 2026 | 73.22 | 72.33 | 72.33 | 73.54 | 71.86 | 1.34M |
| July 23, 2026 | 78.17 | 75.23 | 75.23 | 78.33 | 74.7 | 763,758 |
| July 22, 2026 | 76.98 | 77.06 | 77.06 | 77.99 | 76.14 | 895,411 |
| July 21, 2026 | 77.26 | 76.22 | 76.22 | 77.35 | 75.34 | 908,270 |
| July 20, 2026 | 77.08 | 76.91 | 76.91 | 77.69 | 76 | 542,073 |
| July 17, 2026 | 78.2 | 77.63 | 77.63 | 79.84 | 77.08 | 591,957 |
| July 16, 2026 | 76.47 | 77.08 | 77.08 | 78.17 | 76.44 | 549,860 |
| July 15, 2026 | 76.5 | 77.05 | 77.05 | 77.61 | 76.07 | 589,112 |
| July 14, 2026 | 77.1 | 77.04 | 77.04 | 78 | 75.28 | 759,650 |
| July 13, 2026 | 76.71 | 76.07 | 76.07 | 78.07 | 75.29 | 941,882 |
| July 10, 2026 | 75.3 | 75.49 | 75.49 | 75.76 | 74.67 | 774,136 |
| July 09, 2026 | 75.22 | 74.48 | 74.48 | 76.26 | 74.28 | 869,471 |
| July 08, 2026 | 77.72 | 75.8 | 75.8 | 78.6 | 75.76 | 1.4M |
| July 07, 2026 | 75.04 | 76.27 | 76.27 | 77.13 | 74.82 | 1.84M |
| July 06, 2026 | 73.95 | 74.8 | 74.8 | 75.27 | 72.71 | 1.37M |
| July 02, 2026 | 72.88 | 74.77 | 74.77 | 75.13 | 72.88 | 1.38M |
| July 01, 2026 | 71.86 | 72.82 | 72.82 | 74.26 | 71.23 | 1.84M |
| June 30, 2026 | 74.68 | 73 | 73 | 75.21 | 72.71 | 1.04M |
| June 29, 2026 | 76.44 | 74.72 | 74.72 | 76.53 | 73.73 | 1.32M |
| June 26, 2026 | 76 | 76.62 | 76.62 | 77.18 | 75.58 | 1.57M |
| June 25, 2026 | 75.25 | 76.54 | 76.54 | 76.81 | 74.66 | 1.86M |
| June 24, 2026 | 75.74 | 75.87 | 75.87 | 76.67 | 73.77 | 2.02M |
| June 23, 2026 | 77.37 | 76.48 | 76.48 | 78.32 | 76.26 | 988,310 |
| June 22, 2026 | 79.29 | 77.95 | 77.95 | 79.69 | 77.27 | 1.03M |
| June 18, 2026 | 82.94 | 80.28 | 80.28 | 83.09 | 80.09 | 1.73M |
| June 17, 2026 | 83.67 | 83.48 | 83.48 | 87.27 | 83.23 | 736,411 |
| June 16, 2026 | 86.89 | 84.33 | 84.33 | 87.66 | 83.92 | 1.12M |