The short answer first: xAI is no longer a standalone company. It is a wholly owned subsidiary of SpaceX. xAI, Grok, the X platform, and Colossus compute all sit in SpaceX’s AI segment (SpaceXAI). That is why this site has no separate xAI section; old xAI routes point to SpaceX Watch.
SpaceX listed on Nasdaq on June 12, 2026 (ticker SPCX). Tesla, NVIDIA, and Cisco are public companies or public-company investment arms. This page organizes information only. It gives no investment direction on any stock or indirect exposure.
The 30-Second Answer
Who owns xAI? The shortest answer: SpaceX.
SpaceX’s S-1/A says the xAI Merger closed on 2026-02-02 and xAI became a wholly owned SpaceX subsidiary. Earlier, on 2025-03-28, xAI had acquired X Holdings. According to Reuters, the deal valued SpaceX at $1 trillion and xAI at $250 billion.
Before the Merger: xAI’s Final Big Funding Round
xAI’s last public funding round before joining SpaceX was the Series E in January 2026. xAI’s official announcement confirmed the $20 billion total and the investor list. It did not break out each investor’s amount or the type of security, so the list cannot be turned into a shareholder ranking.
| Date | Event | Amount / Valuation | Notes |
|---|---|---|---|
| 2025-03-28 | xAI acquires X Holdings | Not disclosed | The X platform joins xAI (S-1/A) |
| 2026-01 | xAI Series E | $20 billion (target was $15 billion) | Valor, Stepstone, Fidelity, QIA, MGX, Baron; NVIDIA and Cisco Investments as strategic investors |
| 2026-02-02 | SpaceX acquires xAI | According to Reuters: SpaceX $1T, xAI $250B | Mainly a share exchange; eligible holders could choose cash |
| 2026-06-12 | SpaceX goes public | About $86.2 billion raised (including over-allotment) | Nasdaq, ticker SPCX |
| 2026-08-14 | SpaceX acquires Cursor | Implied valuation $60 billion | All-stock deal; Cursor becomes a wholly owned SpaceX subsidiary |
How Did the SpaceX xAI Merger Change Shareholders?
xAI shareholders received SpaceX stock or cash under the merger terms. The prospectus says each xAI share converted into 0.1433 SpaceX shares (before SpaceX’s 2026 stock split). Eligible holders could choose cash instead.
So “xAI shareholders” now has two layers:
- Company layer: xAI’s direct owner is SpaceX.
- Parent layer: former xAI investors, employees, and option holders received SpaceX equity or cash under the merger terms. Control depends on SpaceX’s dual-class shares.
Control sits with Elon Musk. The pre-IPO S-1/A listed about 85.1% of voting power. His August 13G filing reported 48.4% beneficial ownership of Class A shares (including Class B conversions and exercisable options). Each Class B share carries 10 votes.
After the IPO, SpaceX kept using stock for acquisitions. On 2026-08-14 it completed the Cursor acquisition, and Cursor shareholders also became SpaceX shareholders.
NVIDIA, Cisco, and Colossus: Investors as Compute Partners
Much of xAI’s investor list is really a compute list. The Series E announcement named NVIDIA and Cisco as strategic investors backing xAI’s large GPU-cluster buildout. Grok’s strength comes not only from the model team but also from compute sites like Colossus.
After joining SpaceX, Colossus started renting compute to outside customers. xAI announced a Colossus compute partnership with Anthropic, and later Google and Reflection also became customers. SpaceX’s Q2 2026 earnings release disclosed $14.1 billion in cloud services contracts signed that quarter, and the 10-Q says AI segment revenue growth came mainly from compute leasing. So SpaceXAI is both a model company and a compute supplier.
Penchan’s summary
The key to xAI ownership: its life as an independent company is over. The Series E list tells us who put in the last money before the merger. The SpaceX merger then folded those stakes into SpaceX.
From that point on, Grok is not just a model-competition story. Rockets, Starlink, the X platform, compute leasing, and Musk’s control are all tied together in one company.
Further reading: What kind of company is SpaceX, the xAI-era deep dive, why Anthropic rents Colossus compute.