xAI funding: Every round, investor, and valuation (2026)

xAI is Elon Musk's artificial intelligence company. It builds the Grok family of models, sells them through a chatbot, an API, and subscriptions, and since 2025 has also owned X, the social network formerly called Twitter. Its other big product is computing power: the Colossus data centers in Memphis, which now rent capacity to outside AI labs.

xAI raised about $43 billion, including debt, between 2023 and January 2026. It no longer exists as an independent company. SpaceX acquired it in an all-stock deal on February 2, 2026, SpaceX went public in June 2026, and in July xAI was renamed SpaceXAI and folded into SpaceX as its AI division.

So this is a closed funding history. Every round below happened while xAI was private and on its own, and every investor in it now holds SpaceX stock instead. Let's dive into xAI's funding history.

xAI's funding history splits into three eras: the venture rounds that built its first data center, the 2025 merger with X that brought in debt and Musk's other companies, and the Series E that came weeks before the SpaceX sale. Most of the money paid for chips.

Musk incorporated xAI in Nevada in March 2023 and introduced its founding team that July. A Form D filed in December 2023 showed $134.7 million sold against a $1 billion offering. SpaceX's 2026 IPO prospectus later recorded the full Series A at $750 million.

The first big check came in May 2024. Musk said the Series B was priced at $18 billion before the new money, and the backers were largely the investors who had funded his Twitter purchase: Valor, Vy Capital, Andreessen Horowitz, Sequoia, Fidelity, and Saudi Prince Alwaleed bin Talal's Kingdom Holding.

The Series C followed seven months later. Nvidia and AMD joined as strategic investors, and sovereign funds from Qatar, Oman, and Abu Dhabi came in. Reports put the valuation at about $50 billion, while a Kingdom Holding filing cited by TechCrunch implied about $45 billion.

In March 2025, xAI bought X in an all-stock deal. Musk valued xAI at $80 billion and X at $33 billion, or $45 billion before subtracting X's $12 billion of debt. The deal handed xAI a distribution channel for Grok and a stream of posts to train on, along with X's loans and its advertising business.

xAI then turned to the bond market. Morgan Stanley sold $5 billion of debt in June 2025: $3 billion of 12.5% senior secured notes and $2 billion of term loans, all due in 2030. Demand was modest at first, and the double-digit coupons show what lenders charged a loss-making AI lab.

A separate $5 billion of equity closed at the same time. SpaceX put in $2 billion, its largest investment in another company. The prospectus records this tranche as Series D preferred stock worth about $4.4 billion at year-end, a bit below the announced figure.

The next round of spending did not come through xAI's own fundraising. Valor Equity Partners, whose founder Antonio Gracias sits on SpaceX's board, set up a vehicle that buys Nvidia chips and leases them to xAI. Nvidia invested in the vehicle as an anchor partner.

The first lease was signed in October 2025. In January 2026, Apollo led a $3.5 billion financing to help the vehicle buy $5.4 billion of GB200 servers for a second one.

SpaceX's prospectus lists three Valor leases with about $20 billion of payments over their lives. Accountants treat them as borrowing, but they are not counted in the $43 billion total above.

xAI set out to raise $15 billion in late 2025. It announced $20 billion on January 6, 2026, with Nvidia and Cisco as strategic investors and about 600 million monthly users across X and Grok as its pitch.

Two Series E investors had other ties to Musk's companies. Tesla agreed on January 16 to invest $2 billion, and Saudi Arabia's HUMAIN, owned by the Public Investment Fund, put in $3 billion on top of a 500-megawatt data center partnership with xAI in Saudi Arabia.

Less than a month after the round, SpaceX bought xAI. Each xAI share converted into 0.1433 SpaceX shares, and some holders took $2.9 billion in cash. Tesla's payment was still awaiting regulatory approval, so it received SpaceX shares instead in March.

In March 2026, SpaceX took out a $20 billion bridge loan and used it to repay xAI's notes and term loans along with X's old buyout loans. The payoff came to $18.9 billion, including $1.2 billion in prepayment penalties.

xAI's valuation rose more than tenfold in 20 months. Each step came with a larger round or a merger with another Musk company.

The price roughly doubled from the Series B to the Series C, rose by about 60% in the X merger, then doubled again by the Series E. SpaceX's prospectus shows the per-share price rising from $11.97 in the Series B to $75.46 in the Series E, more than six times higher.

That Series E price matters for one more reason. In the SpaceX deal, eligible employees could take cash instead of stock at $75.46 per xAI share, the same price the last investors had paid. The acquisition priced xAI only modestly above its final private round.

Revenue never came close to justifying the price on its own. xAI's business, with X included, brought in $3.2 billion in 2025 while losing $6.4 billion from operations. Investors were paying for compute capacity, Musk's track record, and access to his other companies.

The acquisition also ended xAI's separate cap table. The details of how xAI's ownership changed hands run from Musk's founding stake to SpaceX's 100%. SpaceX listed on June 12, 2026, raising $75 billion at a valuation of about $1.77 trillion, so xAI's investors now hold a slice of SpaceX's Musk-controlled ownership that they can sell on the open market.

xAI's investor base looks like a map of Musk's financial network. Most of its money came from funds that backed his earlier companies, Gulf sovereign wealth, chipmakers, and two of his own businesses.

Valor invested in the Series B, the Series C, and the Series E, and its founder Antonio Gracias is a longtime Musk ally who sits on SpaceX's board. Valor also built the leasing vehicle that supplies xAI's GPUs.

That gives Valor two ways to earn from xAI: as a shareholder and as a landlord. SpaceX's prospectus flags the leases as related-party deals, with $885 million paid to Valor in 2025.

Andreessen Horowitz, Sequoia, Fidelity, and Vy Capital came in at the Series B and stayed. Most of them also helped fund Musk's 2022 purchase of Twitter, whose value had fallen sharply by the time xAI bought it.

The X merger turned those Twitter stakes into xAI shares, swapping a marked-down social network for a stake in a faster-growing AI lab.

BlackRock, Lightspeed, and Morgan Stanley joined in the Series C. StepStone and Baron Capital came in at the Series E.

Gulf money is a large share of xAI's cap table. Kingdom Holding invested in the Series B and reported a $400 million contribution to the Series C. Qatar Investment Authority and Abu Dhabi's MGX invested in both the Series C and the Series E, and Oman's investment authority joined the Series C.

HUMAIN's $3 billion was the largest disclosed single check in the Series E. It came with a commercial tie: a planned 500-megawatt data center in Saudi Arabia built with xAI.

Nvidia invested in the Series C and the Series E and anchored Valor's GPU vehicle. Its money helps xAI buy more Nvidia chips, the same loop that drives Nvidia's data center business.

AMD joined the Series C as a strategic investor, and Cisco Investments joined the Series E.

SpaceX's $2 billion in 2025 made it one of xAI's largest single backers. Tesla followed with $2 billion in the Series E. That deal links two public companies with different investors, a sore point for Tesla's own shareholder base.

Musk also added to his own stake. Through his trust, he bought $1.4 billion of xAI common stock from current and former employees in 2025.

Almost all of xAI's funding went into computing power. The rest paid for researchers, the X acquisition's debt, and a stream of losses.

Colossus, xAI's first data center, opened in a converted Memphis factory in 2024. SpaceX says xAI brought its first 100,000 Nvidia H100 chips online there in 122 days.

Colossus II went faster. Its first cluster of 110,000 GB200 chips came online in 91 days, and a second cluster of 110,000 GB300 chips took 64 days. To get power quickly, xAI ran gas turbines on site, and civil rights groups sued over air pollution in April 2026.

The spending keeps rising. xAI's segment spent $12.7 billion on capital projects in 2025, and $15.8 billion in the second quarter of 2026 alone.

xAI built more capacity than Grok needed. In May 2026, Anthropic signed agreements to pay $1.25 billion a month through May 2029 for compute across both Colossus sites. Anthropic's own $65 billion Series H is part of what pays that bill.

That contract changed xAI's numbers fast. SpaceX's AI segment reported $2.6 billion of revenue in the second quarter of 2026, with $1.6 billion of it from new compute contracts.

The X merger cost xAI no cash, but it brought X's buyout loans, which SpaceX refinanced in 2026. It also brought X's advertising business, which brought in $367 million in the second quarter of 2026, down from a year earlier.

In June 2026, SpaceX agreed to buy the coding startup Cursor for $60 billion in stock, closing the deal in August. The deal gives SpaceXAI a coding product that already sells to developers. The cap table it replaced is covered in Cursor's pre-deal ownership.

Before the merger, xAI was spending close to $1 billion a month. Bloomberg reported a $7.8 billion cash burn in the first nine months of 2025, against quarterly revenue from xAI's own products of about $107 million in the third quarter.

Those losses are now part of a larger company. How SpaceX makes money matters here, because Starlink's profits now cover what xAI used to raise from investors.

xAI's growth plan now runs through SpaceX. The near-term focus is selling compute to other AI labs, which turned the segment's adjusted EBITDA positive in the second quarter of 2026, plus subscriptions: on September 30, SpaceXAI merged Grok and X into one subscription with four tiers, from free to a $100-a-month Ultra plan. Coding is the second bet, through Cursor and Grok Bot, an AI agent that reached 418,000 weekly users within a month of its August launch.

On the product side, SpaceXAI released Grok 4.7 in September 2026 while training Grok 5 on Colossus II. SpaceX also plans to launch AI compute satellites as early as 2028, and it is building Macrohard, a platform meant to run software work with AI agents.

xAI will not raise money again on its own. Its funding now comes from SpaceX's cash, its IPO proceeds, and its bond markets. The main risks are spending that runs far ahead of revenue, regulators in the EU, the UK, France, India, and Malaysia investigating Grok's deepfake images, the exit of most of xAI's co-founders, and related-party deals that tie SpaceX, Tesla, and Valor together. The scale of the bet is clearer next to OpenAI's funding history, which raised far more without merging into a parent.

xAI raised about $43 billion before SpaceX acquired it: about $38 billion in equity across five rounds and $5 billion in debt. Its largest round was the $20 billion Series E in January 2026. Separately, about $20 billion of GPU leases through Valor Equity Partners funded its chips.

xAI's investors included Valor Equity Partners, Vy Capital, Andreessen Horowitz, Sequoia, Fidelity, BlackRock, Lightspeed, Morgan Stanley, StepStone, Baron Capital, Kingdom Holding, Qatar Investment Authority, MGX, Oman Investment Authority, HUMAIN, Nvidia, AMD, Cisco, SpaceX, and Tesla. All of them received SpaceX stock when SpaceX bought xAI.

xAI was valued at $250 billion when SpaceX acquired it in February 2026. Its last private round, the January 2026 Series E, valued it at about $230 billion, according to reports. It no longer has a separate valuation because it is part of SpaceX.

No. xAI is not listed on its own. It is a subsidiary of SpaceX, which went public on the Nasdaq under the ticker SPCX on June 12, 2026. Buying SpaceX stock is the only way to own a piece of xAI.

SpaceX owns 100% of xAI, which it acquired on February 2, 2026, and renamed SpaceXAI in July 2026. Elon Musk controls SpaceX, so he still controls xAI, the company he founded in 2023.