Rolls-Royce vs SpaceX: which aerospace giant is dominating the stock market in 2026?

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Since its record-breaking IPO last month, the stock market has found a new competitor in the aerospace sector: SpaceX (NASDAQ:SPCX). But trillion-dollar valuation aside, how does it actually weigh up against one of the most established heavyweights in the sector?

Rolls-Royce (LSE: RR.) is a FTSE 100 engineering group with a focus on civil aircraft engines, defence and power systems, while SpaceX is a fast‑growing US satellite operator with a side of AI.

So if I'm looking at aerospace exposure today, which business really dominates the sector, and which one might actually suit a long‑term portfolio? I decided to go beyond the sensationalist headlines and find out exactly how these two giants compare.

Face to face comparison

Rolls-Royce's 2025 results showed revenue of £20.06bn alongside £3.27bn of free cash flow and £1.9bn of net cash. The company resumed dividends at 9.5p per share and plans a £7bn - £9bn buyback between 2026 and 2028.

As of mid‑July 2026, the shares trade around 1,373p with a market-cap close to £113.6bn, and recent analyst targets stretch up to about 1,870p.

SpaceX completed the largest IPO in history in June, selling more than 555m shares at $135 and achieving a valuation of around $1.77trn. The stock jumped 19% on day one to close at $160.95 and briefly traded above $170, putting its market value over $2trn before volatility set in.

By mid‑July, SpaceX shares have dipped below their IPO price at times and recently hovered around the mid‑$130s, leaving the company still worth well over $1.5trn.

A simple snapshot looks like this:

That mix alone raises an obvious question, do I want a profitable cash engine or a richly priced growth rocket?

Risks, resilience and long‑term appeal

Rolls-Royce may be an aerospace powerhouse but it still carries cyclical risks. Civil aerospace earnings depend on long‑haul flying and engine flying hours, so a slowdown in global travel could hurt profits. Defence and power systems offer some diversification, but Middle East tensions and supply‑chain pressures remain key risk factors.

SpaceX's risks are more about valuation and execution. The company's still loss‑making and is investing heavily in Starlink, launch capacity and new projects. So its story relies on very rapid revenue growth and margin expansion over the next decade. The post‑IPO swings show how sensitive sentiment is to news flow and lock‑up concerns.

Analysts and commentators continue to debate whether a $1.6trn‑plus tag is justified, with some fair‑value estimates closer to $780bn. For me, that means SpaceX looks more like a high‑risk growth position than a core defensive aerospace play.

The bottom line

SpaceX clearly dominates the aerospace conversation in 2026, sitting among the world's largest listed companies just weeks after its IPO. But in terms of proven profitability, cash generation and visible shareholder returns, Rolls-Royce arguably offers the more grounded investment case.

For an investor seeking one core aerospace holding in a diversified portfolio, Rolls-Royce remains the more sensible option to consider. Meanwhile, SpaceX may play a part as a smaller speculative allocation.

Should you invest £5,000 in Rolls-Royce Plc right now?

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Mark Hartley does not hold any positions in the companies mentioned.