Short answer: it is far more likely an opening chapter than an ending. But it changes how you should think about Rocket Lab.

1) SpaceX S-1 is not bearish for the sector

If SpaceX is genuinely moving toward public markets, it does two things immediately:

Forces institutional capital to price the entire space economy properly

Validates that launch, satellites, and data infrastructure are no longer speculative niches

That is typically bullish for listed peers, not destructive.

2) But it is bearish for lazy RKLB theses

Let’s be direct. Many RKLB bulls relied on a “next SpaceX proxy” narrative. That breaks the moment SpaceX becomes investable.

Capital that chased RKLB for scarcity may rotate.

So RKLB must now stand on fundamentals, not comparison.

3) Where RKLB still has a real edge

RKLB is not trying to beat SpaceX at its own game. Its positioning is different:

Small-to-medium launch (Electron, Neutron)

End-to-end space systems (satellite components, buses)

Higher-margin, less commoditised segments

Meanwhile, Starlink under SpaceX dominates mass-scale LEO deployment.

Different lanes.

4) The bigger picture most people miss

A SpaceX IPO could expand the pie dramatically:

Governments diversify suppliers (they do not want single-provider risk)

Defence contracts increase for second-tier players

Satellite demand accelerates beyond just Starlink

This is similar to what Nvidia did for AI: it lifted the whole stack.

5) The real risk to RKLB

Not SpaceX itself. It is this:

If SpaceX reveals much higher margins + vertical integration efficiency, valuation benchmarks across the sector will reset

RKLB could look expensive if it cannot show similar operating leverage

Bottom line

Not the end of RKLB

But the end of the easy narrative

If you hold RKLB, the question is no longer “Is space growing?”

It is:

Can RKLB carve out a defensible, profitable niche in a world where SpaceX is fully transparent and institutionally owned?