The former Morgan Stanley dealmaker—who advised on Musk’s $44bn Twitter takeover—steps in to steady finances across xAI and social platform X amid churn and ambitious fundraising.
Elon Musk has appointed Anthony Armstrong, a veteran Morgan Stanley banker who worked on the $44 billion Twitter acquisition in 2022, as chief financial officer of his artificial intelligence venture xAI. The move, first reported by the Financial Times and corroborated by wire services, formalizes Armstrong’s role as a key lieutenant to the billionaire entrepreneur and hands him a sweeping mandate that spans xAI and the social platform X.
Armstrong’s elevation comes at a complicated moment for Musk’s media-and-AI empire. xAI is pushing aggressively to scale its Grok chatbot and underlying infrastructure while pursuing fresh capital at a valuation that people familiar with the talks say could approach $200 billion. At the same time, X continues to grapple with a still-fragile advertising business and shifting subscription economics after a year of tumult and leadership turnover.
The appointment underscores Musk’s pattern of leaning on trusted finance hands from the dealmaking world to tighten control and accelerate decision-making. Armstrong spent years advising technology companies at Morgan Stanley and became closely associated with Musk during the protracted takeover of Twitter, now X. Since then, he has increasingly acted as a fixer and sounding board across Musk’s ventures, according to people who have worked with both men.
A dual brief across xAI and X
People briefed on the plans say Armstrong will be responsible for xAI’s capital strategy, budgeting and partnerships, while also taking a hard look at the financial plumbing of X. That remit includes cash discipline, vendor negotiations, and monetization experiments tied to premium features and creator tools on the social platform. The structure reflects Musk’s tighter integration of the two entities as he pitches investors on the flywheel between a consumer platform rich in real-time data and an AI lab hungry for scale.
The incoming CFO replaces Mike Liberatore, who left earlier this year after a short stint, and arrives amid broader reshuffling in Musk’s upper ranks. Multiple senior departures have punctuated 2025 across the group as Musk pushes through organizational changes and more centralized control. Armstrong’s backers argue that his deal experience and proximity to Musk will translate into faster execution on financings, partnerships and potential acquisitions.
Fundraising and the AI arms race
xAI faces a strategic calendar crowded with capital needs. Training next-generation large language models and deploying the compute required to serve them at scale can run into the tens of billions of dollars. The company has signaled to prospective backers that it intends to build out its own stack—ranging from data center capacity to custom model research—while also pursuing commercial tie-ups that put Grok into the hands of more users.
Armstrong is expected to lead negotiations with sovereign funds, venture investors and strategic partners, say people familiar with the matter. His network in Silicon Valley and on Wall Street, coupled with a reputation for getting difficult transactions over the line, could be decisive as xAI races against cash-rich rivals at OpenAI, Google, and Anthropic. He will also be tasked with sharpening xAI’s revenue model around enterprise tools and API access, beyond the consumer exposure it gets through X.
Stabilizing X’s finances
Even as Musk touts new product velocity at X—ranging from creator payouts to live video and payments—the platform’s financial footing remains a work in progress. Advertising, historically the lifeblood of the business, has been uneven since Musk’s 2022 takeover, and subscription revenues have yet to fully offset that gap. Armstrong’s to-do list includes tightening expense controls, expanding high-yield subscription tiers, and packaging data and analytics products that can appeal to business customers while respecting user privacy.
One immediate priority, according to people who have spoken with Armstrong, will be clarifying how X and xAI share costs tied to data, compute and engineering talent. Clearer internal transfer pricing and more predictable cash burn could make both entities easier to finance—and easier for outside investors to underwrite.
A trusted lieutenant with dealmaking pedigree
Colleagues describe Armstrong as methodical, unflappable and comfortable operating in high-ambiguity environments—traits that served him well in the drawn-out Twitter deal, which careened from boardroom drama to litigation and finally to a close. At Morgan Stanley, he helped lead technology M&A, building relationships with founders and investors across the Valley. For Musk, who prizes speed and loyalty, Armstrong’s combination of discretion and transactional know-how appears to have been the clincher.
Governance questions linger
With Armstrong now wearing the finance hat across two intertwined businesses, questions about governance and investor protections are likely to intensify. Prospective backers will want clarity on board oversight, related-party transactions and how the group allocates scarce compute between research and consumer features. Musk’s supporters argue that centralized authority is essential to out-innovate slower incumbents; skeptics say it concentrates risk.
What success would look like
Insiders sketch out a near-term scorecard for Armstrong: close a marquee funding round on favorable terms; reduce X’s net cash burn while protecting product velocity; secure multi-year compute access that insulates xAI from supply shocks; and publish clearer metrics that help investors track progress on both usage and unit economics. Hitting those marks would strengthen Musk’s hand in the AI race and give xAI the war chest it needs to train larger, more capable models.
Market reaction and the road ahead
Early reaction from investors and partners has been cautiously optimistic. Armstrong’s arrival signals a renewed focus on discipline without abandoning Musk’s bias for rapid iteration. But execution risk remains high: integrating finance functions between a fast-growing AI lab and a global social network is structurally complex, and any misstep—product, policy or otherwise—can ripple quickly through revenue.
For now, the appointment caps months of speculation about who would assume the finance brief for Musk’s AI ambitions. Armstrong, who has moved increasingly close to the center of Musk’s orbit since 2022, now has the remit—and the spotlight. How he balances austerity with ambition will help determine whether xAI can convert momentum into durable advantage.
Reporting note
This article draws on reporting by the Financial Times and corroborating accounts from Reuters and other outlets published on October 7, 2025. Key details—including Armstrong’s appointment, his advisory role on the 2022 Twitter acquisition, and the expectation that he will oversee finances for both xAI and X—were attributed to those reports.
