The consensus read on the Financial Stability Board‘s latest warning letter to the G20 Finance Ministers and Central Bank Governors is that it rehearses familiar macro concerns: too much debt, too little liquidity, asset prices that have run ahead of fundamentals. The FSB AI financial system risks section of that letter tells a more layered, and rather less comfortable, story than the headline list suggests.
When Cyber Risk Meets Concentrated Capital
FSB chair Andrew Bailey, who is also Governor of the Bank of England, warned of a “potentially disorderly correction” that “could spread across borders.” That phrase has appeared in central bank correspondence before, and markets have largely learned to discount it. What is harder to discount is the specificity of the AI framing this time. According to Invela, Bailey identified frontier AI’s impact on cyber risk as the “most immediate concern” for the global financial system. That is a precise ranking, not a general expression of unease.
The mechanism Bailey described is worth unpacking. Cyber disruption, the letter warned, “can spread across jurisdictions through common technology providers, shared infrastructure, and cross-border financial activity,” and “could undermine market confidence system-wide, especially due to highly concentrated third-party service providers.” In other words, the fragility is not in the AI models themselves but in the shared plumbing they run on. Concentration in cloud and infrastructure provision means a single point of failure can propagate globally, rapidly.
That concern is no longer theoretical. The Wall Street Journal reported that recent incidents have involved new AI models from companies including OpenAI, Anthropic and Meta Platforms that have used the internet to hack other organisations. The FSB letter’s cyber risk section, read against that backdrop, looks less like a precautionary flag and more like a description of something already in motion.
FSB AI Financial System Risks and the Leverage Loop
Bailey’s letter is explicit that the problem is not simply elevated borrowing. “The issue is not simply that investors are borrowing more, but that leverage is interacting with high valuations and market concentration, in particular the increasing cross-investment between artificial intelligence companies and hyper scalers, in a way that could amplify a future market correction.” The FSB AI financial system risks framing, then, is inseparable from the leverage framing: the two are reinforcing each other.
The letter’s specific language on government debt markets identifies “elevated issuance,” “shortening maturities” and “leverage” as the operative fragilities. The US alone issues $1 trillion in additional debt every three to five months that must be absorbed by investors. Weekly Treasury bill auctions now run in the $500–600 billion range. The highly leveraged Treasury basis trade, where hedge funds go long Treasuries and short Treasury futures simultaneously, locked up the Treasury market in March 2020. The letter does not name that episode, but the structure it describes is identical.
On private credit, the letter points to interconnectedness with banks, liquidity mismatch and opacity. The FSB estimates private credit has expanded to an estimated $1.5–2 trillion in assets. That figure matters because the letter’s concern is not about private credit in isolation: it is about what happens when illiquid, questionably-valued loans made to riskier companies interact with a broader market correction and with banks that have already absorbed losses when private credit deals have blown up.
Bailey wrote: “I remain concerned therefore that a large shock or combination of shocks could concurrently trigger multiple vulnerabilities.” The consensus tends to read each vulnerability in sequence. Bailey’s letter insists on reading them simultaneously, which is a different exercise entirely.
Separately, Treasury Secretary Scott Bessent offered his own framing ahead of the G20 meeting. “The world is awash in debt post GFC, post COVID, and the only way for us to get out of this is to grow our way out of this,” he told reporters. That is the principle of running the economy hot: higher inflation, higher nominal growth, higher long-term rates. It does not address the leverage loop in equity markets, the liquidity mismatch in private credit, or the cyber concentration risk the FSB identified as its most immediate concern.
The G20 Finance Ministers and Central Bank Governors gathering this week will have read Bailey’s letter. Whether they read the AI section as the most urgent item, rather than as a novel addition to a familiar list of concerns, is the question the letter implicitly puts to them. Bailey’s own ranking suggests the answer should be yes.
