| $218M | ||
| $100M | ||
| $72M | ||
| $60M | ||
| $50M | ||
| $9M |
Buys | $7,751 | 1 | 25 |
Sells | $4,767,404 | 3 | 75 |
| Buesinger Robert F. | EVP, PEM Segment Head | 1 | $7,751 | 1 | $6,034 | $1,717 |
| Bender Mark Steven | EVP & CFO | 0 | $0 | 1 | $1.76M | $-1.76M |
| Chao Albert | Executive Chairman | 0 | $0 | 1 | $3M | $-3M |
Westlake Corporation manufactures and supplies petrochemicals, polymers, and building products worldwide. It operates through two segments, Performance and Essential Materials; and Housing and Infrastructure Products. The Performance and Essential Materials segment manufactures and markets polyethylene, styrene monomer, ethylene co-products, PVC, VCM, ethylene dichloride chlor-alkali, and chlorinated derivative products. The Housing and Infrastructure Products segment manufactures and sells residential PVC siding; PVC trim and moldings; roofing applications; decorative stone; windows; PVC decking; PVC films for various inflatables, wallcovering, tape, and roofing applications; polymer composite roof tiles; PVC pipe and fittings; PVC compounds; and various consumer and commercial products such as landscape edging; industrial, home and office matting; marine dock edging; and masonry joint controls. The company offers its products to a range of customers, including chemical processors, plastics fabricators, small construction contractors, municipalities, and supply warehouses for use in various consumer and industrial markets, including residential construction, flexible and rigid packaging, automotive products, healthcare products, water treatment, and coatings, as well as other durable and non-durable goods. The company was formerly known as Westlake Chemical Corporation and changed its name to Westlake Corporation in February 2022. The company was founded in 1986 and is headquartered in Houston, Texas. Westlake Corporation is a subsidiary of TTWF LP.
Over the last 12 months, insiders at Westlake Corporation have bought $7,751 and sold $4.77M worth of Westlake Corporation stock.
On average, over the past 5 years, insiders at Westlake Corporation have bought $133,191 and sold $6.66M worth of stock each year.
Highest buying activity among insiders over the last 12 months: Buesinger Robert F. (EVP, PEM Segment Head) — $7,751.
The last purchase of 83 shares for transaction amount of $7,751 was made by Buesinger Robert F. (EVP, PEM Segment Head) on 2025‑04‑22.
| 2026-02-27 | Sale | Bender Mark Steven | EVP & CFO | 17,409 0.013% | $100.92 | $1.76M | +3.34% | |
| 2025-12-22 | Sale | Chao Albert | Executive Chairman | 40,836 0.0315% | $73.57 | $3M | +17.37% | |
| 2025-05-27 | Sale | Buesinger Robert F. | EVP, PEM Segment Head | 83 <0.0001% | $72.70 | $6,034 | +10.31% | |
| 2025-04-22 | Buesinger Robert F. | EVP, PEM Segment Head | 83 <0.0001% | $93.39 | $7,751 | -13.56% | ||
| 2024-11-29 | Sale | Chao David Tsung-Hung | director | 1,750 0.0014% | $129.08 | $225,888 | -32.55% | |
| 2024-11-22 | Sale | Chao David Tsung-Hung | director | 1,750 0.0014% | $130.00 | $227,500 | -33.20% | |
| 2024-05-09 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 3,500 0.0027% | $158.50 | $554,750 | -15.55% | |
| 2024-05-03 | Sale | Bender Mark Steven | EVP & CFO | 4,950 0.0039% | $152.19 | $753,341 | -12.22% | |
| 2024-03-15 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 3,878 0.003% | $144.50 | $560,371 | -2.25% | |
| 2024-03-13 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 122 <0.0001% | $144.50 | $17,629 | -0.39% | |
| 2024-03-06 | Sale | Bender Mark Steven | EVP & CFO | 4,804 0.0037% | $141.02 | $677,455 | +1.83% | |
| 2024-02-26 | Sale | Bender Mark Steven | EVP & CFO | 4,854 0.0038% | $137.57 | $667,765 | +4.98% | |
| 2023-11-15 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 4,215 0.0033% | $130.50 | $550,058 | +12.70% | |
| 2023-08-23 | Sale | Chao David Tsung-Hung | 1,000 0.0008% | $131.00 | $131,000 | +9.51% | ||
| 2022-08-31 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 1,000 0.0008% | $98.94 | $98,940 | +15.44% | |
| 2022-08-26 | Sale | Zoeller Johnathan Stevan | VP & Chief Accounting Officer | 542 0.0004% | $107.08 | $58,037 | +6.06% | |
| 2022-05-27 | Sale | Buesinger Robert F. | EVP, HIP, IT & Digital | 14,427 0.011% | $129.47 | $1.87M | -18.79% | |
| 2022-05-19 | Sale | Chao Albert | President & CEO | 12,016 0.0095% | $131.11 | $1.58M | -16.85% | |
| 2022-05-17 | Sale | Kearns Roger L. | COO and EVP - PEM | 8,388 0.0065% | $136.24 | $1.14M | -21.09% | |
| 2022-05-05 | Sale | Ederington L. Benjamin | EVP, GC, CAO and Secretary | 3,143 0.0025% | $139.26 | $437,694 | -22.52% |
| Chao Albert | Executive Chairman | 627722 0.4894% | $66.61M | 2 | 26 | +55.69% |
| Bender Mark Steven | EVP & CFO | 44433 0.0346% | $4.72M | 0 | 35 | |
| Buesinger Robert F. | EVP, PEM Segment Head | 0 0% | $0 | 1 | 25 | |
| TTWF LP | 10 percent owner | 46005277 35.8651% | $4.88B | 0 | 1 | |
| TTWFGP LLC | 10 percent owner | 1395000 1.0875% | $148.04M | 9 | 1 | +79.25% |
| Jenkins Dorothy C | 67228 0.0524% | $7.13M | 1 | 2 | +94.65% | |
| Chao James | Chairman | 51492 0.0401% | $5.46M | 1 | 18 | +94.65% |
| Ederington L. Benjamin | EVP, GC, CAO and Secretary | 37418 0.0292% | $3.97M | 0 | 2 | |
| Kearns Roger L. | COO and EVP - PEM | 26389 0.0206% | $2.8M | 1 | 2 | +110.93% |
| Morse Wayne D | Sr VP, Vinyls | 26009 0.0203% | $2.76M | 1 | 7 | +94.65% |
| Wallace Stephen | VP, General Counsel, Secretary | 25163 0.0196% | $2.67M | 1 | 8 | +94.65% |
| RILEY H JOHN JR | director | 22652 0.0177% | $2.4M | 0 | 2 | |
| Taylor Jeffrey L | Sr VP, Polyethylene | 20206 0.0158% | $2.14M | 2 | 16 | +67.59% |
| Hansen David R | Sr VP Adminstration | 13440 0.0105% | $1.43M | 1 | 15 | +94.65% |
| Condon Donald Marion Jr | Sr VP, Corp Bus Dev | 13106 0.0102% | $1.39M | 0 | 5 | |
| Kenner Andrew | SVP - Chemical Manufacturing | 11437 0.0089% | $1.21M | 0 | 9 | |
| BARNETT E WILLIAM | director | 10559 0.0082% | $1.12M | 0 | 1 | |
| Chao David Tsung-Hung | director | 7784 0.0061% | $826,038.08 | 0 | 3 | |
| BLAKELY ROBERT T | director | 7662 0.006% | $813,091.44 | 0 | 8 | |
| Mattina Michael J. | Sr. VP, Polyethylene | 6063 0.0047% | $643,405.56 | 0 | 1 | |
| Teel Lawrence E. | EVP and Special Advisor to CEO | 4903 0.0038% | $520,306.36 | 0 | 6 | |
| LUKENS MAX L | director | 3280 0.0026% | $348,073.60 | 0 | 7 | |
| Wilder Warren W | Senior Vice President | 2244 0.0017% | $238,133.28 | 1 | 2 | +94.65% |
| Mangieri George J | SVP & Chief Accounting Officer | 1582 0.0012% | $167,881.84 | 0 | 28 | |
| Keng Tai Li | Vice President and Treasurer | 1000 0.0008% | $106,120.00 | 1 | 0 | +94.65% |
| Zoeller Johnathan Stevan | VP & Chief Accounting Officer | 543 0.0004% | $57,623.16 | 0 | 3 | |
| DREESSEN RUTH I | Sr V P - CFO | 67 0.0001% | $7,110.04 | 0 | 1 |
| Increased Positions | 162 | +41.43% | 13M | +29.81% |
| Decreased Positions | 181 | -46.29% | 9M | -21.35% |
| New Positions | 66 | New | 4M | New |
| Sold Out Positions | 67 | Sold Out | 3M | Sold Out |
| Total Postitions | 372 | -4.86% | 46M | +8.45% |
| Orbis Allan Gray Ltd | $290,254.00 | 3.06% | 3.91M | +4M | New | 2025-09-30 |
| Vanguard Group Inc | $255,049.00 | 2.69% | 3.44M | -83,179 | -2.36% | 2025-09-30 |
| Blackrock, Inc. | $236,222.00 | 2.49% | 3.19M | -142,960 | -4.29% | 2025-09-30 |
| Victory Capital Management Inc | $212,541.00 | 2.24% | 2.87M | -855,382 | -22.98% | 2025-09-30 |
| Price T Rowe Associates Inc /Md/ | $163,734.00 | 1.73% | 2.21M | +149,555 | +7.26% | 2025-09-30 |
| Brandes Investment Partners, Lp | $114,836.00 | 1.21% | 1.55M | +91,823 | +6.3% | 2025-09-30 |
| Norges Bank | $101,868.00 | 1.07% | 1.37M | +967,104 | +237.79% | 2025-06-30 |
| Dimensional Fund Advisors Lp | $96,413.00 | 1.02% | 1.3M | +25,071 | +1.97% | 2025-09-30 |
| State Street Corp | $96,042.00 | 1.01% | 1.3M | -96,985 | -6.97% | 2025-09-30 |
| Citadel Advisors Llc | $89,043.00 | 0.94% | 1.2M | +1M | +9,658.26% | 2025-09-30 |