Why S&P 500 (SP500) rose 0.77%
S&P 500 (SP500) rose 0.77% on August 13, 2026 — US AA+ affirmation removes sovereign downgrade risk.
What happened
The S&P 500 rose 0.8% after Fitch affirmed the US at AA+ with a stable outlook, removing near-term sovereign downgrade risk.
Why it moved
A stable US credit rating removes tail-risk premium from equities and Treasuries, signaling that growth slowdown concerns alone will not trigger a ratings shock — this supports risk appetite and contains Treasury stress.
Why it matters
The broad market is riding a two-month uptrend underpinned by macro stability and earnings resilience; the rating affirmation reinforces the backstop, allowing breadth to remain constructive.
What would break the thesis
If growth deteriorates sharply or another rating agency turns negative on US debt trajectory, the stability narrative could break and force a repricing.