WLK

Westlake Corporation$88.45+1.19 (+1.36%)

Prev Close$87.27·MCap$10.92B·P/E—·Vol410.1K·Yield0.02%

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Buys (12M)

$0.00

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Sells (12M)

$5.72M

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Net Activity

Net Seller

$5.72M

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Active Insiders

last 12 mo

Over the past 12 months, insider activity at Westlake Corporation (WLK) has been exclusively selling, with 0 insider purchases totaling $0.00 and 18 insider sales totaling $5.72M. The most recent insider transaction was by Buesinger Robert F. (officer: EVP, PEM Segment Head), who sold $461.0K worth of shares on Mar 31, 2026. Westlake Corporation operates in the Basic Materials sector, within the Chemicals - Specialty industry, with a market cap of $10.92B.

WLK Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 31, 2026	Buesinger Robert F.	officer: EVP, PEM Segment Head	Sell	4,000	$115.25	$461.0K	34,482
Mar 30, 2026	Bender Mark Steven	officer: EVP & CFO	Sell	16,413	$112.54	$1.85M	28,015-37%
Mar 2, 2026	Bender Mark Steven	officer: EVP & CFO	Sell	17,409	$100.92	$1.76M	44,854-28%
Feb 19, 2026	Bender Mark Steven	EVP & CFO	Sell	445	$94.10	$41.9K	0
Feb 19, 2026	Buesinger Robert F.	EVP, PEM Segment Head	Sell	326	$94.10	$30.7K	0
Feb 19, 2026	Chao Albert	Executive Chairman	Sell	2,501	$94.10	$235.3K	0
Feb 19, 2026	Chao James	Senior Chairman	Sell	1,569	$94.10	$147.6K	0
Feb 19, 2026	Ederington L. Benjamin	EVP, Legal & External Affairs	Sell	357	$94.10	$33.6K	0
Feb 19, 2026	Holy Jeffrey Adam	VP and CAO	Sell	81	$94.10	$7.6K	0
Feb 19, 2026	Szwejbka Scott Thomas	SVP, HIP Segment Head	Sell	91	$94.10	$8.6K	0
Feb 17, 2026	Bender Mark Steven	EVP & CFO	Sell	1,209	$98.95	$119.6K	0
Feb 17, 2026	Buesinger Robert F.	EVP, PEM Segment Head	Sell	903	$98.95	$89.4K	0
Feb 17, 2026	Chao Albert	Executive Chairman	Sell	5,089	$98.95	$503.6K	0
Feb 17, 2026	Chao James	Senior Chairman	Sell	2,664	$98.95	$263.6K	0
Feb 17, 2026	Chao John Tsung-chen	Director	Sell	242	$98.95	$23.9K	0
Feb 17, 2026	Ederington L. Benjamin	EVP, Legal & External Affairs	Sell	978	$98.95	$96.8K	0
Feb 17, 2026	Holy Jeffrey Adam	VP and CAO	Sell	213	$98.95	$21.1K	0
Feb 17, 2026	Szwejbka Scott Thomas	SVP, HIP Segment Head	Sell	295	$98.95	$29.2K	0
Dec 6, 2021	Chao Albert	President & CEO	Sell	30,787	$91.85	$2.83M	471,026
Dec 3, 2021	Chao Albert	President & CEO	Sell	30,787	$91.75	$2.82M	463,070
Nov 15, 2021	Bender Mark Steven	EVP and CFO	Sell	2,369	$101.57	$240.6K	22,024
Nov 10, 2021	Bender Mark Steven	EVP and CFO	Sell	631	$100.77	$63.6K	24,393
Nov 8, 2021	Bender Mark Steven	EVP and CFO	Sell	6,356	$98.80	$627.9K	25,024
Aug 12, 2021	Chao Albert	President & CEO	Buy	3,000	$86.21	$258.6K	441,939
May 11, 2021	Buesinger Robert F.	EVP, Vinyl Products	Sell	5,000	$105.00	$525.0K	8,217-38%
Mar 15, 2021	Bender Mark Steven	EVP and CFO	Sell	15,740	$94.70	$1.49M	37,200-30%
Mar 10, 2021	Bender Mark Steven	EVP and CFO	Sell	25,811	$92.27	$2.38M	31,380-45%
Mar 9, 2021	Buesinger Robert F.	EVP, Vinyl Products	Sell	16,513	$93.69	$1.55M	21,160-44%

WLK Insider Buying Activity

The following table shows recent insider purchases of Westlake Corporation (WLK) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Aug 12, 2021	Chao Albert	President & CEO	Buy	3,000	$86.21	$258.6K	441,939

WLK Insider Selling Activity

The following table shows recent insider sales of Westlake Corporation (WLK) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 31, 2026	Buesinger Robert F.	officer: EVP, PEM Segment Head	Sell	4,000	$115.25	$461.0K	34,482
Mar 30, 2026	Bender Mark Steven	officer: EVP & CFO	Sell	16,413	$112.54	$1.85M	28,015-37%
Mar 2, 2026	Bender Mark Steven	officer: EVP & CFO	Sell	17,409	$100.92	$1.76M	44,854-28%
Feb 19, 2026	Bender Mark Steven	EVP & CFO	Sell	445	$94.10	$41.9K	0
Feb 19, 2026	Buesinger Robert F.	EVP, PEM Segment Head	Sell	326	$94.10	$30.7K	0
Feb 19, 2026	Chao Albert	Executive Chairman	Sell	2,501	$94.10	$235.3K	0
Feb 19, 2026	Chao James	Senior Chairman	Sell	1,569	$94.10	$147.6K	0
Feb 19, 2026	Ederington L. Benjamin	EVP, Legal & External Affairs	Sell	357	$94.10	$33.6K	0
Feb 19, 2026	Holy Jeffrey Adam	VP and CAO	Sell	81	$94.10	$7.6K	0
Feb 19, 2026	Szwejbka Scott Thomas	SVP, HIP Segment Head	Sell	91	$94.10	$8.6K	0
Feb 17, 2026	Bender Mark Steven	EVP & CFO	Sell	1,209	$98.95	$119.6K	0
Feb 17, 2026	Buesinger Robert F.	EVP, PEM Segment Head	Sell	903	$98.95	$89.4K	0
Feb 17, 2026	Chao Albert	Executive Chairman	Sell	5,089	$98.95	$503.6K	0
Feb 17, 2026	Chao James	Senior Chairman	Sell	2,664	$98.95	$263.6K	0
Feb 17, 2026	Chao John Tsung-chen	Director	Sell	242	$98.95	$23.9K	0
Feb 17, 2026	Ederington L. Benjamin	EVP, Legal & External Affairs	Sell	978	$98.95	$96.8K	0
Feb 17, 2026	Holy Jeffrey Adam	VP and CAO	Sell	213	$98.95	$21.1K	0
Feb 17, 2026	Szwejbka Scott Thomas	SVP, HIP Segment Head	Sell	295	$98.95	$29.2K	0
Dec 6, 2021	Chao Albert	President & CEO	Sell	30,787	$91.85	$2.83M	471,026
Dec 3, 2021	Chao Albert	President & CEO	Sell	30,787	$91.75	$2.82M	463,070
Nov 15, 2021	Bender Mark Steven	EVP and CFO	Sell	2,369	$101.57	$240.6K	22,024
Nov 10, 2021	Bender Mark Steven	EVP and CFO	Sell	631	$100.77	$63.6K	24,393
Nov 8, 2021	Bender Mark Steven	EVP and CFO	Sell	6,356	$98.80	$627.9K	25,024
May 11, 2021	Buesinger Robert F.	EVP, Vinyl Products	Sell	5,000	$105.00	$525.0K	8,217-38%
Mar 15, 2021	Bender Mark Steven	EVP and CFO	Sell	15,740	$94.70	$1.49M	37,200-30%
Mar 10, 2021	Bender Mark Steven	EVP and CFO	Sell	25,811	$92.27	$2.38M	31,380-45%
Mar 9, 2021	Buesinger Robert F.	EVP, Vinyl Products	Sell	16,513	$93.69	$1.55M	21,160-44%