SpaceX's IPO filing revealed extensive commercial and financial ties among Elon Musk's companies ranging from Cybertruck purchases and shared private jets to stock investments, showing how deeply intertwined his business empire has become ahead of what could become the largest IPO in history. While many of the billionaire's companies have long collaborated, the filing contains previously undisclosed details about how they now form a network bound by commercial agreements, financing obligations and operational dependencies spanning AI, transportation, communications and infrastructure. The disclosures on Wednesday showed rapidly expanding transactions among SpaceX, electric vehicle maker Tesla, artificial intelligence company xAI and social network X ahead of a planned SpaceX IPO targeting a valuation of about $1.75 trillion.