NEW YORK, Jan 8, 2026, 13:30 EST — Regular session
Westlake Corp (WLK) shares jumped 7.4% in early afternoon trading on Thursday, extending a sharp intraday rebound after the chemical maker disclosed it had completed an acquisition in its compounds business. The stock was up $5.51 at $79.98, after ending Wednesday at $74.47.
The purchase matters now because Westlake is leaning harder into specialty compounds — plastics tailored for specific uses — as investors look for steadier earnings in a sector that can swing with construction demand and commodity chemical pricing. Compounding is the work of blending a base polymer with additives to make a material with specific properties, such as flexibility or heat resistance.
The move came alongside broad gains in U.S. chemicals. Dow was up 4.1%, LyondellBasell rose 5.7% and Huntsman gained 5.4%, outpacing the wider market’s more uneven tone.
In an SEC filing dated Jan. 6, Westlake said it completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group. Chief executive Jean-Marc Gilson said the deal “represents a strong strategic alignment” for Westlake’s Housing & Infrastructure Products business, while Maribel Wilson, vice president of Westlake Global Compounds, said ACI had built a reputation for “innovative, high-value solutions.” 1
Westlake said ACI is headquartered in Portugal and makes specialty materials that mainly serve wire and cable markets, and that the acquisition expands Westlake Global Compounds’ manufacturing footprint into Portugal, Romania and Tunisia, adding to operations in Mexico. The company did not disclose financial terms. 2
Westlake is a Houston-based manufacturer and supplier spanning commodity chemicals and building products, with businesses ranging from chlor-alkali and chlorovinyls to pipes, fittings and building materials. 3
The company has been trying to steady results after a tough 2025 for parts of its commodity chemicals portfolio. In its most recent quarterly report, Westlake posted a net loss and said weaker industrial and manufacturing conditions had weighed on pricing and margins in its Performance and Essential Materials segment, particularly chlorovinyls, which includes PVC resin used in pipes and other construction products. 4
But the bounce in the shares does not erase the core risk: Westlake still lives with a chemical cycle that can turn fast, and the ACI deal adds integration work across multiple countries at a time when investors are watching costs closely. If pricing for PVC and other commodity products slips again, or if end-markets tied to housing cool further, the stock’s rally can fade just as quickly.
