SpaceX's historic IPO didn't just make Elon Musk the world's first trillionaire—it created thousands of new millionaires almost overnight. This is seen as one of the biggest employee wealth-creation events in corporate history. What is more surprising is that around 400 workers are now holding stakes worth over $100 million.More than 4,400 current and former employees, from engineers to welders and cafeteria staff, are expected to cross the seven-figure wealth mark. These workers accumulated company stock rather than salaries over the years as SpaceX transformed from a risky startup into a multi-trillion-dollar aerospace giant.ALSO READ: What is El Niño and how does it affect India?The IPO That Changed Thousands of LivesSpaceX debuted on the Nasdaq at an IPO price of $135 per share, valuing the company at roughly $1.77 trillion before shares surged higher during trading. The stock later closed significantly above its listing price, pushing the company's valuation beyond $2 trillion.The listing is being described as one of the largest IPOs in history of Wall Street and has not only boosted Musk's fortune but also created an army of newly wealthy employees.From $28-an-Hour Welder to Nearly a MillionaireOne of the most talked-about stories is that of Juan Hernandez. Hernandez immigrated from Mexico and joined SpaceX in 2015 as a contractor welder earning about $28 per hour. According to reports, he initially knew very little about the company.Instead of receiving only cash compensation, he was granted company stock and later purchased additional shares through payroll deductions. Today, that stake is reportedly worth close to $900,000, highlighting how employee ownership transformed the fortunes of workers far beyond Silicon Valley's executive suites.A Risky Career Choice That Paid OffTrevor Hise's journey also tells a similar story how SpaceX IPO rewarded more than executives. Years ago, Trevor's family encouraged him to pursue a stable career with industrial giant General Electric. Instead, he chose SpaceX, a company that was still viewed by many as a risky startup.After spending more than a decade at the rocket maker and accumulating over 100,000 shares, his holdings are now worth an estimated $13.5 million at the IPO price alone. Reports quote him describing the scale of the financial windfall as "ridiculous."Why So Many Employees Got RichUnlike many tech companies that rely heavily on high salaries, SpaceX spent years rewarding employees across all levels with equity. That approach meant thousands of workers accumulated shares while helping build rockets, satellites and manufacturing facilities.As a result, the IPO's gains reached far beyond executives and investors, benefiting people working on factory floors, launch sites and production lines.A New Challenge: Managing Sudden WealthThe scale of the wealth creation has produced an unusual problem. According to reports, more than 100 SpaceX employees quietly joined forces before the IPO to negotiate a group wealth-management arrangement that could oversee as much as $5 billion in assets.Many had never previously needed professional wealth-management services, making the IPO a life-changing financial event in more ways than one.