The biggest force driving a future SpaceX IPO may not be retail investors or even Elon Musk fans. It could be passive index funds.

In an exclusive email interview with Benzinga, former Goldman Sachs and JPMorgan executive Chan Ahn said that Nasdaq's updated index-inclusion rules could unleash massive institutional buying into SpaceX shares almost immediately after listing.

According to Ahn, the company may qualify for Nasdaq-100 inclusion within just 15 trading days under the exchange's new "fast entry" framework.

What happens next, he argues, could reshape IPO dynamics.

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