Warren Buffett’s Berkshire Hathaway is closing in on a deal to buy Occidental Petroleum’s petrochemical unit OxyChem for roughly $10 billion, the Wall Street Journal reported Tuesday.

The potential deal, which could finalize within days per the Journal, could be Berkshire’s largest since 2022 when it bought insurer Alleghany for $11.6 billion. That deal was announced in March of that year and completed in October 2022. Berkshire is sitting on a record cash hoard of $344 billion.