Basell roots: BASF and Shell form a joint venture focused on polyolefins technology and development.

Lyondell (US) emerges as a refining and petrochemicals company, expanding along the US Gulf Coast into olefins, aromatics, and plastics intermediates.

Lyondell expands petrochemical production and integration, improving feedstock flexibility and downstream capacity.

Basell consolidates polyolefins businesses and strengthens technology licensing, catalysts, and process technologies for PP and PE leadership.

Basell is formally created by combining major European polyolefins assets, establishing global scale in polyolefins production and licensing.

Basell accelerates international expansion and licensing footprint for polyolefins processes and catalysts.

Lyondell continues as a major US petrochemical and refining company with significant olefins and polymers production.

Basell is acquired by Access Industries (Len Blavatnik), enabling larger-scale consolidation.

Basell acquires Lyondell, forming LyondellBasell Industries.

Strategic impact

Market downturn pressures a highly leveraged post-merger balance sheet.

2009: Files for Chapter 11 bankruptcy protection in the US to restructure debt and operations.

Emerges from Chapter 11, significantly reducing debt and improving financial flexibility.

Public-market presence is re-established, enabling renewed growth and investment.

Emphasis on operational excellence, margin improvement, and disciplined capital allocation.

Strengthens polyolefins licensing franchise and catalysts business via global customers and joint ventures.

Capacity expansions and debottlenecking across key sites to increase olefins and polyolefins output.

Greater focus on differentiated polyolefins grades and technology-driven product development.

Announces acquisition of A. Schulman to expand into higher-value engineered and specialty polymer solutions.

Completes acquisition of A. Schulman.

Strategic impact

Increases focus on sustainability, recycling technologies, and circular polymers initiatives.

Develops and early-scales circular product offerings via mechanical and chemical pathways.

Manages pandemic volatility with emphasis on resilience, safety, and operational continuity.

Continues progress on circular and low-carbon product development alongside core operations.

Expands circular economy commitments and partnerships to scale advanced (chemical) recycling and integrate recycled feedstocks into polymer production.

Invests in circular polymers portfolio, including capacity expansion planning and collaborations for feedstock sourcing and technology deployment.

Continues portfolio optimization to prioritize high-return projects and competitiveness.

Advances circular and renewable-based polymer offerings, emphasizing traceability and certification for recycled/renewable content.

Continues asset optimization and reliability initiatives across global operations.

Integrates sustainability targets more deeply into strategy (circularity, emissions reduction, product innovation).

Expands differentiated polyolefins and specialty compounds, reinforcing global leadership.