I am a huge fan of SpaceX (SPCX 1.12%) as a business. The company has an incredible track record of lowering the cost of launching payloads into space. And SpaceX's biggest growth initiatives -- which include everything from launching data centers into space to establishing a human colony on the moon -- are nothing less than jaw-dropping.
But with SpaceX's market cap of $2 trillion, I'm just not sure how much long-term upside there is to the stock at this point. If you're looking for exciting growth investments with huge long-term potential, the two stocks below may be better options.
NASDAQ: RIVN
Key Data Points
1. Rivian
Rivian (RIVN +2.63%) remains one of my top growth stocks for 2026. The company trades at a deep discount to other EV stocks such as Tesla (TSLA 0.35%). Yet this year, it is scaling its first affordable vehicle -- its R2 SUV with a starting price under $50,000 -- and is heavily invested in AI and autonomous driving. The latter should help it target the robotaxi market, which some experts believe will be a $10 trillion opportunity. Rivian's market cap hovers around $20 billion despite promising growth potential.
Image source: Getty Images.
2. NuScale Power
NuScale Power (SMR 4.19%) has a market cap of just $3.7 billion. But it's also chasing an opportunity that experts value at $10 trillion long term: nuclear energy.
Rapid adoption of AI technologies is fueling a surge in data center construction. Data centers, however, are energy intensive, requiring massive amounts of additional energy generation capacity to come online. NuScale's small modular (nuclear) reactors (SMRs) are positioned as a promising solution.
NYSE: SMR
Key Data Points
The execution risk is high here, considering the limited real-world adoption of SMRs currently. But NuScale's tiny market cap offers plenty of upside potential.
