Founders Fund's roughly 3% stake in SpaceX is now valued at over $50 billion, following an initial investment of $600 million, according to sources cited by Bloomberg. The venture firm's bet on the rocket company has multiplied more than 80-fold, positioning it for an extraordinary windfall.

Andreessen Horowitz (a16z) also stands to reap the biggest return in its history, with its stake exceeding $10 billion. These figures underscore the scale of wealth creation tied to SpaceX, which has disrupted the aerospace industry with reusable rockets and a dominant launch business.

The valuation surge comes as SpaceX continues to raise capital and expand its Starlink satellite internet service. Bloomberg's sources indicate the returns are based on the company's current private market valuation, which has climbed steadily amid strong demand for shares from secondary investors.

SpaceX has not yet set a date for a potential IPO, but the looming public offering has investors eagerly calculating payouts. The company's ability to maintain its growth trajectory and manage regulatory challenges will be critical to realizing these paper gains.

Critics caution that SpaceX's valuation could be inflated by hype and limited trading volume, with some analysts arguing the company's long-term profitability depends on Starlink's subscription growth and NASA contracts.