SpaceX reported that its artificial intelligence division, xAI, which operates the Grok AI service, spent $15.8 billion on capital expenditures in the second quarter of 2026, far exceeding analyst expectations of $13.09 billion and accounting for most of the company's $18.4 billion in total quarterly spending. The unexpectedly high AI costs triggered a sharp reversal in investor sentiment, with SpaceX shares falling 6.5% in after-hours trading despite surging 9% during regular trading hours on the day of the earnings announcement.

For a company built on launching rockets and operating satellites, the scale of SpaceX's AI investment raises questions about the company's strategic priorities and the broader cost of building competitive large language models. The xAI spending nearly doubled from the previous quarter, signaling an aggressive push to scale Grok's capabilities and infrastructure.

Why Is SpaceX Spending So Much on AI?

SpaceX's xAI unit operates Grok, an AI assistant that competes with models like OpenAI's ChatGPT and Google's Gemini. Building and maintaining large language models requires enormous computational resources, including specialized processors and data centers. The $15.8 billion quarterly spend reflects the capital-intensive nature of training, fine-tuning, and deploying AI systems at scale. This investment comes as Elon Musk has publicly stated that artificial intelligence has entered a "supersonic tsunami" phase, suggesting he views AI development as critical to SpaceX's long-term strategy.

The company's revenue in its first quarterly update as a public company did exceed analyst expectations, with most revenue coming from Starlink, SpaceX's satellite internet service. However, investor focus quickly shifted to the unexpectedly high capital expenditures tied to xAI, overshadowing the positive revenue results.

What Happens When the Insider Lockup Expires?

SpaceX went public on June 12, 2026, in what was described as a record-setting initial public offering. However, the company immediately faced significant headwinds. The stock erased approximately $1 trillion in value as it plunged amid anticipation of insider stock sales and broader concerns about the pace of AI spending. Despite this decline, SpaceX maintains a market valuation exceeding $1 trillion, making it one of the most valuable companies in the world.

A critical catalyst for potential further stock pressure is the expiration of the lockup period, which restricts early shareholders from selling their shares. This lockup period was set to expire the day after the earnings announcement, when up to 20% of the total SpaceX shares held by insiders could be sold on the open market. When more shares become available for trading, the increased supply typically puts downward pressure on the stock price.

Key Factors Affecting SpaceX's Stock Performance

• AI Capital Expenditures: The $15.8 billion quarterly spending on xAI, double the previous quarter, exceeded analyst expectations and triggered immediate investor concern about the sustainability of such high spending levels.
• Insider Share Sales: The expiration of the lockup period allowed insiders holding approximately 95% of SpaceX's 13.9 billion shares to begin selling on the open market, increasing supply and creating downward price pressure.
• Elon Musk's Ownership Stake: Musk owns approximately 42% of SpaceX, giving him substantial control over the company's strategic direction and making his personal wealth closely tied to the stock's performance.

Despite the stock's volatility, some retail investors remain bullish on SpaceX's long-term prospects. One 20-year-old investor who received three shares as part of the IPO stated he plans to hold his shares despite the plunge, expressing confidence in the company's role in the emerging space economy.

How to Understand SpaceX's Dual Business Model

• Starlink Revenue Stream: SpaceX generates the majority of its revenue from Starlink, its satellite internet service, which provides a stable, recurring revenue base that helps fund other ventures.
• xAI Capital Intensity: The xAI unit requires massive upfront capital investment in computing infrastructure and data centers to develop and operate Grok, with spending expected to remain high as the company scales.
• Merger Speculation: Investor speculation has grown that SpaceX may attempt to merge with Tesla, Musk's electric vehicle company, which would consolidate control over multiple technology ventures under a single corporate structure.

The company also announced a partnership deal with Nvidia to collaborate on a future satellite project, providing some positive momentum during a period of stock volatility. This partnership suggests SpaceX is leveraging its space expertise alongside advanced computing capabilities to develop next-generation satellite technology.

SpaceX's situation illustrates a broader tension in the technology industry between the enormous capital requirements of AI development and investor expectations for profitability and disciplined spending. As the company navigates its first earnings cycle as a public company, the balance between aggressive AI investment and shareholder returns will likely remain a focal point for market participants.