NYSE · WLK · stock
Westlake Corp. (WLK) stock price history
Every NYSE trading session of Westlake Corp. from Aug 12, 2004 to Sep 28, 2026: 5,567 daily bars, adjusted for splits and dividends, with minute bars from Jul 13, 2026 forward. The full series is served by the API: a free key covers the last year, paid plans the whole history and minute bars.
WLK adjusted close, 2004 to 2026
- $154.42
- All time high, 2024
- $123.49
- 52 week high, $55.23 low
- 5,567
- Daily sessions since 2004
Last updated Sep 28, 2026, the last stored session. Refreshes after each trading day. Full 2004 to 2026 series and minute bars.
WLK key facts
- Westlake Corp. (WLK) closed at $66.84 on Sep 28, 2026 on NYSE.
- WLK's all time high close is $154.42, set on Apr 9, 2024; its all time low close is $3.97 on Mar 9, 2009.
- WLK's 52 week range is $55.23 to $123.49.
- WLK returned -12.2% over the year to Sep 28, 2026 and -21.3% over five years.
- Over ten years WLK returned +51%, +4.2% a year compounded.
- WLK's deepest drawdown was -75.2% from May 21, 2018 to Mar 16, 2020.
- DataCedar holds 5,567 daily sessions of WLK history from Aug 12, 2004 and minute bars from Jul 13, 2026, adjusted for splits and dividends, served by the API under a key.
WLK price chart, 2004 to 2026
WLK returns
Price return from the last close on or before the window start to Sep 28, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | -11.7% |
| 3 months | -12.8% |
| 6 months | -40.6% |
| Year to date | -9.8% |
| 1 year | -12.2% |
| 3 years | -43.5% |
| 5 years | -21.3% |
| 10 years | +51.0% |
| Since Aug 12, 2004 | +1,122% |
| Compound annual growth, 22.1 years | +12.0% |
WLK records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $154.42 on Apr 9, 2024
- All time low close
- $3.97 on Mar 9, 2009
- 52 week high
- $123.49 on Apr 7, 2026
- 52 week low
- $55.23 on Nov 20, 2025
- Deepest drawdown
- -75.2% from May 21, 2018 to Mar 16, 2020, recovered Mar 10, 2022
- Best single session
- +17.9% on Jul 8, 2010
- Worst single session
- -23.8% on Mar 9, 2020
- Volatility, 1 year annualised
- 43.5%
- Sessions closing higher, 1 year
- 46%
- Growth of 1 since 2004
- 12.2×
- Best calendar year
- 2012, +109%
- Worst calendar year
- 2007, -39%
WLK price history by year
Open is the first session's open, high and low span the year, close is the last session's close, and the return is close over the previous year's close. 2004 starts on Aug 12, 2004; 2026 runs to Sep 28, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $73.76 | $123.49 | $65.66 | $66.84 | -8.6% | 212.1M | 185 |
| 2025 | $110.68 | $115.44 | $55.23 | $73.13 | -33.8% | 285.8M | 250 |
| 2024 | $133.23 | $154.97 | $108.48 | $110.42 | -16.9% | 116.6M | 252 |
| 2023 | $96.22 | $136.34 | $91.82 | $132.88 | +38.4% | 117.9M | 250 |
| 2022 | $90.75 | $131.03 | $75.87 | $96.02 | +6.8% | 197.4M | 251 |
| 2021 | $76.01 | $97.89 | $68.02 | $89.90 | +20.5% | 146.9M | 252 |
| 2020 | $63.34 | $77.60 | $26.12 | $74.58 | +18.5% | 148M | 253 |
| 2019 | $57.39 | $71.55 | $49.88 | $62.93 | +7.7% | 191.6M | 252 |
| 2018 | $93.51 | $108.86 | $52.78 | $58.42 | -37.3% | 207.9M | 251 |
| 2017 | $48.97 | $93.98 | $48.72 | $93.12 | +92.4% | 213.1M | 251 |
| 2016 | $45.89 | $53.19 | $33.89 | $48.40 | +4.7% | 261M | 252 |
| 2015 | $51.48 | $66.85 | $41.79 | $46.23 | -10.1% | 203.4M | 252 |
| 2014 | $50.56 | $82.61 | $44.96 | $51.40 | +0.9% | 189.8M | 252 |
| 2013 | $33.78 | $50.99 | $31.82 | $50.95 | +55.2% | 226.3M | 252 |
| 2012 | $16.03 | $33.30 | $15.75 | $32.83 | +109.1% | 262.1M | 250 |
| 2011 | $17.03 | $26.31 | $12.17 | $15.70 | -6.9% | 218.7M | 252 |
| 2010 | $9.67 | $17.03 | $6.70 | $16.86 | +76.0% | 111.8M | 252 |
| 2009 | $6.19 | $10.82 | $3.93 | $9.58 | +54.8% | 97.9M | 252 |
| 2008 | $7.14 | $8.57 | $4.39 | $6.19 | -13.2% | 212.1M | 253 |
| 2007 | $11.70 | $13.83 | $6.88 | $7.13 | -39.0% | 257.6M | 251 |
| 2006 | $10.72 | $13.86 | $9.76 | $11.69 | +9.4% | 172.1M | 251 |
| 2005 | $12.32 | $13.94 | $8.14 | $10.69 | -13.4% | 102.9M | 252 |
| 2004 | $5.39 | $13.01 | $5.37 | $12.35 | n/a | 37M | 99 |
WLK monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $66.84 | -11.0% |
| August 2026 | $75.07 | +6.5% |
| July 2026 | $70.50 | -3.4% |
| June 2026 | $73.00 | -15.9% |
| May 2026 | $86.83 | -24.2% |
| April 2026 | $114.59 | -1.3% |
| March 2026 | $116.12 | +11.4% |
| February 2026 | $104.23 | +32.9% |
| January 2026 | $78.46 | +7.3% |
| December 2025 | $73.13 | +10.7% |
| November 2025 | $66.08 | -2.1% |
| October 2025 | $67.46 | -10.7% |
About the WLK data
Daily bars. 5,567 sessions from Aug 12, 2004 to Sep 28, 2026, one row per NYSE trading day with open, high, low, close and volume. Prices are adjusted for splits and cash dividends so the series is comparable across its whole length; the API also serves the raw, split only and dividend only views.
Minute bars. Stored from Jul 13, 2026 forward, most recent session Sep 28, 2026. Minute history is captured from the day collection began and is never backfilled, so this start date is exact. Five minute, fifteen minute and hourly bars are derived from these minutes.
Time and currency. Session dates are NYSE trading days; minute timestamps are UTC. Prices are in USD. Volume is shares traded on the session.
Get the data. The REST endpoint returns the daily series as JSON with pagination; a free key serves the last year, Quant and above the full history back to Aug 12, 2004, and minute bars come with the paid windows. It takes timeframe (1Min, 5Min, 15Min, 1Hour, 1Day), adjustment, start and end. See the bars endpoint and authentication, and pricing for the plan windows.
curl "https://api.datacedar.com/v3/stocks/WLK/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on NYSE
Common questions
WLK share price history
