---
symbol: "SP500"
name: "S&P 500"
date: 2026-08-13
change_pct: 0.7661300741582928
direction: "up"
event_type: "regulatory_legal"
url: "https://perplo.app/why/SP500/2026-08-13"
updated_at: 2026-08-13T21:06:42.907Z
---

# Why S&P 500 (SP500) rose 0.77% on August 13, 2026

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.

## Sources

- [Fitch affirms US at AA+, keeps outlook stable amid growth slowdown](https://investinglive.com/news/fitch-affirms-us-at-aa-keeps-outlook-stable-amid-growth-slowdown/) — ForexLive
- [Its the 'what'd I miss?' post! Oil falls despite Hormuz chaos, S&P 500 record high](https://investinglive.com/commodities/its-the-what-d-i-miss-post-oil-falls-despite-hormuz-chaos-s-p-500-record-high/) — ForexLive
- [investingLive Americas market news wrap: S&P 500 hits a fresh record](https://investinglive.com/news/investinglive-americas-market-news-wrap-s-p-500-hits-a-fresh-record/) — ForexLive

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