CDS Correlation Among Big Tech Surges, Risk Spilling Over Into Equities
Alina Collins
Bloomberg strategist Simon White warns that CDS correlation among mega-cap tech firms is spiking and beginning to transmit into equity markets — if stock correlation catches up, the VIX could be pushed sharply higher.
CDS correlation and equity correlation — why have they split?
Around 2025, CDS correlation — how closely several companies' default risks move together — diverged sharply from equity correlation: CDS jumped while stock correlation kept falling.
This means → the credit market is now pricing the largest AI-linked companies' default risk as a single theme — not identical default odds, but synchronized direction of movement.
Equities didn't follow because each firm's AI strategy differs widely: Apple chose not to scale compute, cloud hyperscalers are pouring into data centers, and revenue expectations and capex commitments vary — so stock prices moved independently.
Low stock correlation looks stable — why is it actually a vulnerability?
White argues low equity correlation is not resilience but fragility — a thin layer of ice that shatters once a common risk factor surfaces.
In plain terms = tech stocks currently "rise and fall on their own," but that independence suppresses the VIX, making volatility gauges look calm and masking the real risk.
The latest signal: CDS correlation is climbing again, and this time it comes with widening credit spreads — a different backdrop from the spread-tightening environment of late 2025, pointing to a shifted risk regime.
What is the equity market missing?
Bloomberg's default-risk model — driven by market cap, volatility, and macro variables — shows the implied default probability from equities has risen far less than CDS spreads have widened. The two are visibly diverging.
This means → the stock market has not fully priced the balance-sheet deterioration at big tech firms. The risk that CDS has already "seen" is not yet reflected in share prices.
Once the market begins to price in this single-factor risk, equity implied correlation — currently near historic lows — will snap upward toward CDS correlation, dragging the VIX higher.
How does the "negative feedback loop" start spinning?
White's core mechanism: VIX rises → pushes credit spreads wider (equity volatility is an input to Merton distance-to-default models) → wider spreads hit the real economy → feed back into stock prices and volatility — a self-reinforcing loop.
In plain terms = volatility and credit spreads feed each other — one rises, the other follows, then pushes the first one even higher, like a snowball rolling downhill.
The loop already shows early signs: rising CDS correlation has begun to lift volatility in high-yield and investment-grade bond indices; the VIX remains relatively calm but is drifting upward.
Has contagion started? What is the key indicator to watch?
Sector-level data show that over the past month or two, tech-sector correlation has risen the most, and White believes contagion may already be under way.
CDS market liquidity can be thin, but the current spread widening has fundamental backing — it aligns with rising leverage ratios at hyperscale tech companies.
This reflects the critical observation point for whether this spillover event fully detonates: can equities maintain low correlation while credit spreads keep widening? If that floor breaks, the VIX could surge rapidly.
Content is for reference only, not financial advice.