Big U.S. firms are burning cash on AI and investors are nervous

Alphabet posted a rare hit to liquidity in the second quarter, burning $5.9 billion in free cash flow as it accelerated spending on AI infrastructure, prompting fresh warnings that the sector’s largest companies may be outspending the cash they generate. The development — reported alongside rising capex plans across the industry — is forcing firms to lean more on debt and equity to fund data centers, chips and power upgrades.Alphabet’s cash burn

The shift matters because the spending is concentrated in a handful of hyperscalers whose capital allocation choices now affect broader market liquidity and investor sentiment. If cloud and AI revenue growth fails to catch up with spending, analysts say, the financing model that underpinned Silicon Valley’s rise could fray.

Alphabet posts first quarterly cash burn of $5.9bn

Alphabet’s negative free cash flow in Q2 — reported by Reuters and highlighted in contemporaneous coverage by the Financial Times — is the clearest near-term signal that AI capex is biting into profitability. Cloud revenue at Google Cloud grew 82% in the quarter even as parent-company cash flow fell, illustrating the timing mismatch between revenue recognition and heavy upfront capital outlays.Alphabet’s cash burn

Investors reacted quickly: analysts warned that Alphabet’s swing to negative FCF could presage similar announcements from other large AI spenders, swelling scrutiny of corporate balance sheets and return on invested capital. The Wall Street Journal captured the market mood as wary, noting calls for companies to demonstrate that AI will lift margins rather than simply increase costs.

Hyperscalers may spend more than they generate by 2027

Reuters’ modelling suggests the four biggest U.S. hyperscalers — Microsoft, Alphabet, Amazon and Meta — could collectively spend more on capex than they produce in free cash flow by 2027 if current trajectories continue.AI investment boom report

Consensus capex estimates for a broader set of companies jumped from roughly $485 billion in January to about $730 billion by late July, Reuters found, with firms increasingly tapping debt and equity markets instead of relying solely on cash generation to fund growth.Tech companies tap debt and equity

That financing shift matters. Debt raises fixed obligations; equity issuance dilutes existing shareholders. Both reduce the margin of error for management teams that must now prove sizable returns on hardware, power and real-estate investments.

Analysts point to divergent company fortunes as proof the market will differentiate. Amazon’s AWS growth has reassured investors even as the company lifted 2026 capex guidance toward $220 billion, while Meta’s free cash flow plunged as it poured money into data centers and custom AI chips.Amazon capex and AWS reactionMeta’s compute conundrum

But the framing that strong cloud growth automatically justifies capex is contested. Reuters’ Breakingviews warns investors will remain cautious until companies show sustained revenue-to-capex improvements, and the WSJ has flagged “runaway” spending as a market risk.

Several executives have defended the outlays as necessary to capture long-term AI market share; critics counter that the near-term visibility on monetisation remains limited. The Washington Post summarised that tension: big-tech cash burn shifts risk from individual firms to broader financial markets.

Looking ahead, the next concrete signals will be third-quarter free-cash-flow prints and updated capex guidance from the hyperscalers. Those numbers will tell whether Q2 was an outlier tied to timing or the start of a multi-year structural shift in how America’s largest technology companies finance AI.