Westlake Corporation WLK

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Westlake Corporation Common Stock · Company · NYSE

Announcement types: (default: consequential filings)
Results & current reports
Capital markets
Ownership & governance

USD closing-price chart (daily close from yfinance · Last year)

USD 85.68 → 77.06 · -10.1%
123.39089.88556.380 1 2 3 4 5,6 7,8 9,10 11 12 13 14 15 16 17,18,19 20 21 22 23 24 25 26 27 Jul 25Oct 25Jan 26Apr 26Jul 26

Numbered dotted lines mark the filtered filings under Announcement Events below.

Price & SEC Filing History 22 Jul 2025 — 23 Jul 2026 (Last year)

Daily NYSE prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.

No data yet
76.9800 77.9900 76.1400 77.0600 895,390
77.2600 77.3500 75.3400 76.2200 908,300
77.0800 77.6900 76.0000 76.9100 542,100
Weekend
Weekend
78.2000 79.8400 77.0800 77.6300 592,000
76.4700 78.1700 76.4400 77.0800 549,900
76.5000 77.6100 76.0700 77.0500 589,100
77.1000 78.0000 75.2800 77.0400 759,700
76.7100 78.0700 75.2900 76.0700 941,900
Weekend
Weekend
75.3000 75.7600 74.6700 75.4900 774,100
75.2200 76.2600 74.2800 74.4800 878,000
77.7200 78.6000 75.7600 75.8000 1,401,500
75.0400 77.1300 74.8200 76.2700 1,836,100
73.9500 75.2700 72.7100 74.8000 1,366,700
Weekend
Weekend
No trading
72.8800 75.1300 72.8800 74.7700 1,381,800
71.8600 74.2600 71.2300 72.8200 1,844,500
74.6800 75.2100 72.7100 73.0000 1,039,700
76.4400 76.5300 73.7300 74.7200 1,322,200
Weekend
Weekend
76.0000 77.1800 75.5800 76.6200 1,570,100
75.2500 76.8100 74.6600 76.5400 1,884,900
75.7400 76.6700 73.7700 75.8700 2,043,300
77.3700 78.3200 76.2600 76.4800 988,300
79.2900 79.7000 77.2700 77.9500 1,025,400
Weekend
Weekend
No trading
82.9400 83.0900 80.0900 80.2800 1,731,700
83.6700 87.2700 83.2300 83.4800 736,400
86.8900 87.6600 83.9200 84.3300 1,121,500
27 · 8-K After-hours · 16:45 ET 8-K ↗
87.6500 88.7600 86.1600 87.4500 620,700
Weekend
Weekend
87.4500 89.4700 86.5300 88.5000 770,800
88.4300 89.2300 86.4300 87.2700 531,700
86.5000 88.9900 85.8100 87.1200 1,179,500
85.6300 86.9200 84.3800 86.1100 1,184,300
84.3800 85.7800 83.7500 85.2600 914,800
Weekend
Weekend
84.2900 85.3400 82.9800 84.6400 826,300
86.2900 87.0400 84.3700 85.2500 781,600
86.4600 87.9000 85.7500 86.3900 867,200
86.3100 87.9300 85.8900 86.8300 722,200
87.5000 88.9900 86.3400 86.3800 916,700
Weekend
Weekend
87.5000 87.8100 86.0800 86.8300 916,400
87.4500 88.7000 87.1400 87.6700 857,500
86.9100 89.3700 86.3900 87.8100 1,072,500
88.7700 89.3900 88.0600 88.7700 693,100
No trading
Weekend
Weekend
88.7600 89.9800 87.1400 88.6000 829,700
88.7300 89.1300 86.5400 88.1000 873,300
88.4700 89.4900 87.7500 88.5000 926,400
91.2300 91.2300 88.1500 88.6600 1,099,000
26 · 8-K After-hours · 17:00 ET 8-K ↗
90.2200 93.1800 88.5700 91.4600 1,473,500
Weekend
Weekend
91.1900 91.5300 88.3300 88.5900 1,870,400
93.6500 94.3900 91.5000 91.5300 1,000,400
97.3400 98.3000 92.2200 92.2700 1,364,300
99.0200 99.5100 96.4400 96.5400 1,018,500
94.8800 98.9500 93.8600 97.5600 1,499,200
Weekend
Weekend
97.8800 98.4700 93.4200 93.8500 1,404,800
98.9500 100.0500 97.1000 97.3800 1,413,900
25 · 10-Q After market open · 13:49 ET 10-Q ↗
99.4800 102.5700 98.6600 99.9200 2,171,000
102.7000 106.9300 101.2300 104.7800 1,799,900
24 · 8-K Pre-market · 07:30 ET 8-K ↗
115.5200 116.2600 112.4000 114.8700 1,204,700
Weekend
Weekend
115.7500 117.0500 114.7800 114.9900 1,162,000
23 · 8-K Pre-market · 07:08 ET 8-K ↗
111.4900 115.7100 111.1900 115.2800 940,600
112.0900 112.4800 110.4800 111.4100 930,000
112.4100 112.8600 109.1400 110.3500 692,800
111.9100 113.6600 109.4200 111.1900 794,600
Weekend
Weekend
112.0000 113.4900 109.6800 110.6400 1,052,400
114.3500 115.6000 110.5800 112.2500 982,900
117.4700 117.6600 113.5000 114.2800 1,087,600
112.9300 115.8800 112.1500 115.6500 854,600
22 · 8-K After-hours · 17:05 ET 8-K ↗
111.7200 115.6000 111.7200 113.8800 885,700
Weekend
Weekend
114.0000 114.5100 110.7900 112.6100 1,491,700
116.7300 119.2300 116.4100 119.0000 1,084,400
118.1300 118.4100 114.4300 115.2500 951,300
119.4900 119.9700 115.0100 117.9300 935,300
21 · 8-K Pre-market · 06:01 ET 8-K ↗
120.0000 121.9400 118.5000 120.1500 871,000
Weekend
Weekend
118.9700 120.9500 117.5000 118.3700 926,100
120.9900 122.5300 116.2600 117.2100 1,318,700
114.2500 120.8800 113.3300 120.8100 1,529,600
120.5200 124.2300 119.4400 123.3900 1,026,100
117.6100 119.6000 116.3700 119.5300 1,044,200
20 · 8-K Pre-market · 06:02 ET 8-K ↗
Weekend
Weekend
No trading
116.6000 120.0000 114.4900 119.4000 934,000
19 · 8-K Pre-market · 08:01 ET 8-K ↗ 18 · DEFA14A Pre-market · 07:35 ET DEFA14A ↗ 17 · DEF 14A Pre-market · 07:30 ET DEF 14A ↗
117.0000 119.3500 115.4300 116.5800 1,061,400
116.7500 119.6900 114.4700 116.8200 1,229,600
115.1100 117.1700 113.5900 116.0000 2,027,700
Weekend
Weekend
111.8000 114.4400 111.8000 113.2900 1,083,900
113.6300 115.9400 112.5600 113.4600 1,035,100
114.4100 116.1900 113.2300 114.2200 1,119,500
107.9400 115.1300 107.0700 114.0900 1,078,000
107.7900 111.4700 107.0000 108.5000 1,549,800
Weekend
Weekend
111.8000 112.4100 105.4800 106.1200 1,522,200
110.8900 112.6700 109.4000 111.2300 948,700
113.1200 115.7800 112.5600 112.6000 1,322,700
111.2500 114.9700 110.1800 111.4400 1,213,500
111.2500 113.1000 110.0000 110.7900 1,324,200
Weekend
Weekend
115.0000 116.4600 111.5000 112.0400 1,606,600
107.2400 114.6500 107.2400 114.2200 1,622,500
104.7500 107.6800 103.5400 107.0300 1,051,500
104.8100 107.7400 103.8600 105.0400 927,400
102.1800 107.4500 100.5400 106.3400 1,215,400
Weekend
Weekend
104.0000 106.1000 99.3400 103.1900 1,486,700
107.5000 112.2100 104.8400 105.5100 1,999,600
105.3100 106.3900 101.6700 106.1300 1,031,800
103.4900 104.8600 99.6000 102.9200 1,569,400
103.3200 108.8800 102.7000 106.7900 1,758,900
Weekend
Weekend
98.2000 106.0000 97.9000 105.3800 1,287,600
16 · 10-K After market open · 13:39 ET 10-K ↗
102.5700 103.6700 99.1100 100.3400 899,200
106.3600 106.6600 101.5600 103.0900 1,689,400
102.7200 107.9900 97.8300 104.1700 2,388,100
15 · 8-K Pre-market · 07:22 ET 8-K ↗ 14 · 8-K After-hours · 16:55 ET 8-K ↗
93.8400 95.2300 91.7600 93.0200 1,303,200
Weekend
Weekend
94.1000 96.2600 92.6900 94.4000 1,050,600
98.5400 100.0000 93.1000 95.0600 1,528,700
98.9500 100.7700 97.5200 99.5300 1,006,200
99.5800 101.3000 96.4800 97.8200 1,385,800
No trading
Weekend
Weekend
98.5000 101.3500 97.3100 100.0800 820,900
100.6900 103.0000 96.6800 98.7300 1,183,600
98.5600 102.9800 98.5600 100.3600 1,850,400
97.0300 100.2400 96.3400 99.1200 1,218,600
94.1000 96.6000 93.5500 96.4800 983,900
Weekend
Weekend
94.0900 96.3100 93.1800 95.9300 1,094,700
94.1700 95.2500 90.3200 92.1700 1,574,300
93.0500 98.0600 93.0500 96.0000 2,645,700
84.5300 91.5900 84.5200 90.9000 2,029,100
79.8900 84.2700 78.6100 83.7700 1,571,900
Weekend
Weekend
80.5800 82.0500 77.5800 79.3200 2,094,800
82.1000 82.6900 78.4400 81.5600 1,370,200
82.4900 83.0000 80.9900 81.8800 1,180,000
83.5200 84.5500 81.6500 81.6800 1,252,100
85.5900 85.9500 83.4900 84.1600 1,403,100
Weekend
Weekend
86.9000 87.3900 85.0800 85.2200 1,279,500
87.0900 89.8500 86.2000 86.7500 987,600
84.9900 87.9700 84.3200 86.6800 1,826,400
86.3000 86.3000 83.3000 83.9200 1,107,900
No trading
Weekend
Weekend
86.6300 88.8800 86.6300 87.8700 904,900
90.8200 91.0800 86.2700 88.3000 2,111,400
85.6300 90.1900 85.0700 89.8500 1,600,500
85.7200 86.4800 84.4800 85.0000 1,179,700
83.0000 85.1300 82.6300 84.9400 2,078,900
Weekend
Weekend
79.9000 83.3000 78.4200 83.2000 1,622,700
73.8600 81.5500 73.5000 79.5300 1,759,300
77.8600 78.6300 73.9500 74.4700 1,640,400
13 · 8-K After-hours · 16:54 ET 8-K ↗
74.9000 78.3400 74.3900 77.4300 1,358,400
73.9000 77.3300 73.9000 74.9800 1,005,400
Weekend
Weekend
74.5700 75.1700 72.6900 74.1500 919,800
No trading
74.8100 75.2200 73.5000 73.9400 839,200
74.4200 75.4500 74.2900 74.8800 945,000
73.0100 74.6800 72.9600 74.3800 1,186,700
Weekend
Weekend
73.6300 74.0100 73.1800 73.7500 704,400
No trading
73.6100 74.1200 72.8400 73.6800 313,900
74.0400 74.3300 71.8700 73.2900 1,328,100
72.5700 74.6000 72.2600 74.3900 928,100
Weekend
Weekend
75.4400 75.4400 71.7900 72.4900 1,786,700
74.4000 75.6600 73.3400 74.7800 1,514,500
73.2000 75.4400 73.0800 73.9800 1,921,700
73.0000 74.4200 72.0600 73.3400 2,460,000
76.0200 76.3300 71.2700 73.6300 3,755,900
12 · 8-K Pre-market · 07:30 ET 8-K ↗
Weekend
Weekend
75.2800 75.4000 73.6100 74.4000 1,944,500
72.6100 75.0900 72.2300 74.9200 1,960,500
68.6700 72.8500 68.2600 72.7300 1,752,400
68.6900 71.0300 68.4200 68.4400 1,464,200
67.8000 69.1300 66.9200 67.6200 1,580,000
Weekend
Weekend
68.2400 70.3400 67.5300 68.0200 1,488,000
68.6600 69.1700 67.2800 67.9700 2,100,800
66.7000 70.3100 66.4500 68.7100 1,538,500
67.5200 67.7300 66.0900 66.6000 1,249,300
65.5000 70.0600 65.5000 67.5900 2,362,300
Weekend
Weekend
64.7100 66.9700 64.6600 66.8100 1,050,600
No trading
62.8400 65.2200 62.7800 64.7200 1,524,200
60.8800 63.5500 60.7000 62.8700 2,194,300
58.8600 61.0400 58.6200 60.6200 3,632,100
Weekend
Weekend
56.9000 60.9200 56.8300 59.0300 1,929,100
57.8800 59.3700 56.3300 56.3800 1,915,000
58.3400 58.8400 56.8500 57.5000 1,869,700
59.0500 59.6800 57.4300 58.6500 1,410,300
62.5600 62.7700 58.5800 59.0500 1,037,700
Weekend
Weekend
64.2600 64.2600 62.3900 62.5600 858,500
62.6900 65.6800 62.6900 64.9100 1,985,700
63.4500 64.5800 62.3000 62.8100 1,189,200
11 · 8-K Pre-market · 06:30 ET 8-K ↗
65.8100 66.2800 62.9400 63.4500 1,418,800
65.8500 65.8500 64.2100 65.1800 1,203,100
Weekend
Weekend
64.0000 65.5300 63.8900 64.9500 875,400
65.9200 66.3000 64.3300 64.4600 1,114,600
10 · 8-K After-hours · 17:03 ET 8-K ↗ 9 · 424B5 After-hours · 17:01 ET 424B5 ↗
66.5400 67.5000 65.3800 65.8600 931,900
8 · 8-K After market open · 09:51 ET 8-K ↗
67.4600 68.1900 66.7600 66.7800 874,000
7 · 424B5 Pre-market · 09:22 ET 424B5 ↗
69.0000 70.6200 67.8700 68.2800 1,566,000
Weekend
Weekend
6 · 10-Q After market open · 15:02 ET 10-Q ↗ 5 · S-3ASR After-hours · 17:02 ET S-3ASR ↗
67.9100 69.5200 67.3300 68.8100 1,949,500
69.5200 72.8200 65.7700 68.2900 3,359,800
4 · 8-K Pre-market · 07:33 ET 8-K ↗
76.6400 76.6400 73.1200 73.4700 1,992,700
77.8400 78.8700 75.8000 76.4400 1,167,100
79.5700 80.0400 79.2000 79.7300 598,700
Weekend
Weekend
79.6500 80.2800 78.9000 79.2200 891,800
78.1300 79.2400 76.6000 78.7900 1,253,100
76.5200 77.6900 75.0800 75.3500 1,176,800
75.3400 77.0400 74.5800 76.9000 1,086,200
75.8300 76.2000 74.9100 75.3900 664,800
Weekend
Weekend
76.0000 76.2000 74.7000 75.2500 989,500
77.6200 77.8900 75.3600 76.0500 909,100
78.2300 79.0800 77.0900 77.3300 1,359,200
75.1000 78.0400 74.2900 77.7900 1,009,700
76.7100 78.5400 76.3000 77.7300 872,500
Weekend
Weekend
81.2000 81.7000 75.4900 75.6400 1,402,600
82.5000 83.0000 80.0800 80.7200 1,264,100
80.6300 82.6900 79.2400 82.3700 1,126,900
82.0000 83.4800 79.5000 80.3600 1,628,200
83.2600 83.3400 81.2500 81.7000 899,500
Weekend
Weekend
79.9500 82.7700 78.7900 82.3100 936,300
76.7000 80.2600 76.6800 79.8700 1,376,600
76.5200 77.5400 75.0900 76.7600 1,180,600
76.3700 77.2300 75.0300 77.0600 936,600
78.5000 78.8900 76.5300 77.0200 599,000
Weekend
Weekend
76.5800 78.3700 76.1600 77.6500 1,076,500
77.8700 78.1100 75.8600 76.0000 1,061,400
79.7100 81.0300 78.8100 78.8800 1,022,000
82.0100 82.3900 79.5500 79.7000 969,600
82.5000 82.5000 80.9200 81.2600 1,575,900
Weekend
Weekend
84.6000 84.9500 82.7000 83.0700 1,342,200
88.0100 88.3300 84.9000 84.9600 1,243,800
88.2300 91.5000 85.6600 86.9600 1,357,200
87.0900 88.2400 86.7500 87.7000 1,035,000
88.7200 89.0900 85.8400 86.7500 1,027,100
Weekend
Weekend
89.2100 89.6900 87.8600 88.1300 745,800
85.4400 89.6500 85.4400 89.5800 831,600
85.4900 86.7000 84.9000 85.0700 751,700
88.0000 89.1100 85.6700 86.0100 1,086,400
89.1100 89.1100 86.2900 88.3800 857,100
Weekend
Weekend
88.3100 92.2200 87.4100 89.4200 1,200,200
84.5500 87.8600 83.5100 87.6400 1,000,400
85.5600 86.5800 83.5700 84.6500 951,500
86.3900 86.9900 85.2100 86.5300 555,300
No trading
Weekend
Weekend
86.7500 88.1500 86.4800 87.8200 907,500
86.9000 87.0800 85.1700 86.4100 1,097,000
85.2700 87.5200 85.2700 86.0800 882,500
3 · 8-K After-hours · 16:46 ET 8-K ↗
87.5500 87.7700 85.8300 86.1800 1,318,500
89.5400 90.0800 86.9700 87.2300 1,229,000
Weekend
Weekend
83.6800 91.2300 83.4000 90.6000 2,312,300
81.8400 83.2300 80.8400 82.7400 688,200
85.1500 86.0800 82.7400 82.7500 1,124,100
83.6500 84.2100 82.5900 83.5600 1,011,900
83.8900 84.0800 82.2300 83.2800 1,099,300
Weekend
Weekend
86.2200 86.8200 83.8300 83.9800 1,004,500
83.0500 85.9300 82.4000 85.5400 2,100,600
79.4100 85.0700 79.4100 85.0400 1,293,000
76.8900 79.2000 76.3400 79.1700 1,301,400
79.1700 80.0700 76.2100 76.8900 1,002,700
Weekend
Weekend
82.0300 82.6000 78.8700 79.0000 1,230,700
82.8900 84.0900 81.6900 82.0700 1,082,300
2 · 10-Q After-hours · 17:01 ET 10-Q ↗
83.8400 84.3600 80.6600 81.1200 1,303,000
82.9900 85.1200 80.7300 83.0800 2,588,500
1 · 8-K Pre-market · 07:25 ET 8-K ↗
76.4200 77.4100 75.8300 76.2500 1,828,300
Weekend
Weekend
78.4000 78.5000 75.0700 75.4300 1,594,500
77.8000 79.4300 77.5000 79.3000 1,419,300
84.5400 84.5400 78.9900 79.6500 1,640,600
86.0100 86.2600 84.2300 85.1300 1,725,900
85.0500 86.4300 83.6200 85.8100 1,338,800
Weekend
Weekend
82.6500 86.1100 82.0600 85.7600 1,431,800
84.6900 85.4100 81.1200 82.2100 2,067,100
87.6900 88.5100 86.1800 87.3100 757,400
82.8600 86.1700 82.6000 85.6800 1,005,700

Announcement Events

Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.

27 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:45 ET Summarise
26 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:00 ET Summarise
25 10-Q 10-Q (opens SEC filing in a new tab) After market open · 13:49 ET Summarise
24 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:30 ET Summarise
23 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:08 ET Summarise
22 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:05 ET Summarise
21 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:01 ET Summarise
20 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:02 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:01 ET Summarise
18 DEFA14A DEFA14A (opens SEC filing in a new tab) Pre-market · 07:35 ET Summarise
17 DEF 14A DEF 14A (opens SEC filing in a new tab) Pre-market · 07:30 ET Summarise
16 10-K 10-K (opens SEC filing in a new tab) After market open · 13:39 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:22 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:55 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:54 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:30 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:30 ET Summarise
10 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:03 ET Summarise
9 424B5 424B5 (opens SEC filing in a new tab) After-hours · 17:01 ET Summarise
8 8-K 8-K (opens SEC filing in a new tab) After market open · 09:51 ET Summarise
7 424B5 424B5 (opens SEC filing in a new tab) Pre-market · 09:22 ET Summarise
6 10-Q 10-Q (opens SEC filing in a new tab) After market open · 15:02 ET Summarise
5 S-3ASR S-3ASR (opens SEC filing in a new tab) After-hours · 17:02 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:33 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:46 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 17:01 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:25 ET Summarise