BP Plc (LSE:BP.) has completed the sale of a 65% stake in its Castrol lubricants business to US investment firm Stonepeak Partners for $6 billion, marking another step in the energy group’s restructuring programme and efforts to strengthen its balance sheet.
The transaction, agreed at the end of 2025, will provide BP with cash proceeds intended primarily for debt reduction while allowing the company to retain a 35% interest in Castrol.
The disposal forms part of BP’s broader strategy to simplify its portfolio and concentrate investment on its core oil and gas operations, refining and trading activities.
Castrol Transaction Supports Balance Sheet Restructuring
The completion of the $6 billion transaction represents a significant asset disposal for BP as it seeks to improve its financial position following several years of weaker performance.
The company plans to direct the proceeds towards reducing its financial obligations, which include conventional borrowings, hybrid bonds, lease liabilities and payments associated with the Deepwater Horizon disaster settlement.
BP reported net debt of $13.87 billion at the end of the third quarter, according to its latest earnings announcement.
The Castrol disposal is expected to provide additional financial flexibility as BP continues to evaluate its portfolio and prioritise debt reduction.
BP Retains 35% Interest in Castrol
Under the transaction, Stonepeak Partners has acquired a controlling 65% stake in Castrol, while BP retains a minority holding of 35%.
The arrangement allows BP to realise substantial cash proceeds while maintaining exposure to the lubricants business’s future performance.
Castrol will operate with greater independence under its new ownership structure, potentially providing additional flexibility for its commercial and operational development.
BP Chief Executive Officer Meg O’Neill commented:
“This deal brings meaningful cash proceeds to BP today while retaining a valuable stake in Castrol’s future growth,” Chief Executive Officer Meg O’Neill said in a statement on Monday. “It will now have greater independence to accelerate its next phase of delivery.”
Asset Sales Form Part of Wider Strategic Refocus
BP has undertaken multiple disposals as part of its efforts to streamline operations and concentrate resources on its principal energy businesses.
The company is seeking to focus investment on upstream oil and gas production, downstream operations and trading, while reducing financial commitments through asset sales and tighter capital allocation.
The Castrol transaction represents one of the company’s major portfolio changes under this approach.
The disposal also comes as BP continues to address its financial obligations and reassess the allocation of capital across its operating businesses.
New CEO to Present Long-Term Strategy in December
Meg O’Neill, who became BP’s first externally appointed chief executive in April 2026, is expected to outline her long-term strategy for the company in December.
The presentation is expected to provide further details on BP’s investment priorities, portfolio structure and approach to financial management.
Investors will be watching for additional information on how the company intends to balance debt reduction, operational investment and potential further asset disposals.
The completion of the Castrol transaction provides BP with additional cash resources ahead of that strategic update.
More About BP Plc
BP Plc is a multinational energy company with operations spanning oil and gas exploration and production, refining, energy trading and related businesses.
The company has been restructuring its portfolio to concentrate investment on its core operations and improve its financial position.
Its completed sale of a majority stake in Castrol forms part of this strategy, with the proceeds intended to support debt reduction while BP retains a minority interest in the lubricants business.
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