Nvidia disclosed in a 14th August regulatory filing that it owned 122.76 million class A shares of SpaceX worth close to $21 billion at the end of June. Nvidia's massive stake makes Elon Musk's rocket company the second-largest reported stock holding in its portfolio at the end of Q2, behind its investment in Intel. Nvidia owned 214.77 million Intel shares valued at $29.9 billion, per the filing.
Note that Nvidia's SpaceX holdings came from its earlier investment in Musk's AI venture xAI. The chipmaker invested $10 billion in xAI as part of a $20 billion funding round in January, and SpaceX subsequently acquired xAI next month in a $1.25 trillion transaction.