SpaceX vs. Quantinuum: Which Recent IPO Stock Is a Better Buy?

Quantinuum saw so much demand for shares, the company upsized its IPO.

Both have experienced share price declines since going public.

Investors have been treated to a pair of compelling investment opportunities in 2026. Two of the most anticipated initial public offerings in recent memory have experienced share price declines since their IPOs: Quantinuum (NASDAQ: QNT) and Space Exploration Technologies Corporation (NASDAQ: SPCX) , better known as SpaceX.

Quantinuum is among the latest public companies in the exciting field of quantum computers. It was born out of a merger between Honeywell 's quantum computing division and U.K.-based Cambridge Quantum. SpaceX made history as the biggest IPO ever.

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Their share price pullback presents a potential entry point for those seeking exposure to the frontiers of space exploration and quantum computing. To choose between these newly public companies, here are insights into which one makes a better stock investment.

Quantum computers harness the properties of quantum mechanics to execute complex computations beyond the capabilities of today's computers. The company claims this enables its machines to achieve breakthroughs in areas such as healthcare, materials science, and energy.

Demand for Quantinuum stock was so large, the company upsized its IPO to $60 per share, raking in $1.7 billion. Since then, the price has sunk as low as $47.06 per share as its sky-high price-to-sales (P/S) ratio contributed to a sell-off. Even so, the stock's sales multiple of 99 as of Aug. 6 remains elevated, indicating investors maintain high future growth expectations.