S&P 500 vs Nasdaq 100 Divergence 2026: SPY-QQQ Tracker
Are SPY and QQQ decoupling? We track the SPY-QQQ correlation, ratio deviation, tech concentration risk, and sector rotation signals. Research-only.
Last updated: Apr 8, 2026 · SPY: $520 · QQQ: $488 · 30D Corr: 0.92
QUICK ANSWER · AS OF Apr 8, 2026
What is the SPY vs QQQ divergence in 2026?
The SPY-QQQ 30D correlation is 0.92 (baseline: 0.95). SQDI: 25/100 (ELEVATED). SPY at $520, QQQ at $488. Current regime: SPY ↓ / QQQ ↓ — Broad selloff.
30D Correlation
0.92
Baseline
0.95
Regime
SPY ↓ / QQQ ↓
SQDI
25/100 (ELEVATED)
SPY and QQQ are both declining in a broad selloff. Tech concentration risk is the key structural driver — QQQ's heavy mega-cap weighting creates vulnerability if AI capex cycle disappoints.
SQDI 25/100 — SPY/QQQ ratio at 1.066 vs 3y avg 1.12 — QQQ has outperformed historically but is now slightly underperforming. 30D correlation 0.92 remains high but below the 0.95 baseline. Tech concentration risk is the primary structural concern.
30D Corr
0.92
Baseline
0.95
Regime
SPY ↓ / QQQ ↓
SQDI Composite Score
Ratio Deviation (40%)
48/100
SPY/QQQ ratio at 1.066 (3y avg: 1.12, below by 4.8%).
Correlation Break (35%)
15/100
30D correlation: 0.92 (baseline: 0.95). Correlation is falling — break magnitude: 0.03.
Relative Momentum Spread (25%)
4/100
30D spread: +0.4pp (SPY: -2.8%, QQQ: -3.2%). SPY outperforming.
Rolling Correlation — SPY vs QQQ
SPY and QQQ normally maintain ~0.95 correlation — they are both US large-cap equity indices with significant overlap. When correlation drops, it signals meaningful structural divergence driven by tech concentration, sector rotation, or rate sensitivity.
| Window | Correlation | Interpretation |
|---|---|---|
| 30D | 0.92 | Slightly below baseline — mild divergence |
| 90D | 0.94 | Near baseline — normal co-movement |
| 180D | 0.93 | Slightly below — persistent mild divergence |
| Baseline | 0.95 | Long-term reference (~0.95) |
SPY-QQQ Regime Map
SPY ↑ / QQQ ↑
Broad rally
SPY ↓ / QQQ ↑
Tech-led divergence
SPY ↑ / QQQ ↓
Rotation out of tech
SPY ↓ / QQQ ↓
Broad selloff
← CURRENT
Current regime
SPY ↓ / QQQ ↓
Historical frequency
30%
Avg duration
4.2 mo
30D spread
+0.4pp
Both SPY and QQQ are declining, with QQQ slightly underperforming (-7.4% YTD vs -5.2% for SPY). This is a broad risk-off regime where tech concentration risk is beginning to weigh on the Nasdaq. The SPY/QQQ ratio has compressed from ~1.12 (3y avg) to 1.066, reflecting QQQ's relative outperformance over recent years now partially reversing.
Divergence Drivers — Context Only (Not Scored)
QQQ is heavily concentrated in mega-cap tech (top 10 holdings ~55% of weight). When concentration unwinds, QQQ underperforms SPY significantly. The Magnificent 7 concentration is at historically extreme levels.
Massive AI infrastructure spending by mega-caps creates binary risk for QQQ. If AI monetization disappoints, QQQ faces outsized drawdown vs SPY which has more sector diversification.
QQQ has higher duration exposure due to growth stock concentration. Rising real rates compress QQQ multiples more than SPY, driving divergence.
Rotation from tech into value/cyclicals narrows the SPY-QQQ gap as SPY benefits from broader sector exposure while QQQ loses its tech premium.
Historical Divergence Episodes
| Period | Regime | What happened |
|---|---|---|
| 2000–2002 | SPY ↓ / QQQ ↓ | QQQ crashed ~83% from peak; SPY fell ~49%. Massive tech-led divergence. |
| 2022 | SPY ↓ / QQQ ↓ | QQQ -33% vs SPY -19%. Rate-sensitive growth stocks led the decline. |
| 2023–2024 | SPY ↑ / QQQ ↑ | QQQ significantly outperformed SPY as AI-driven mega-caps surged. |
| Q1 2026 | SPY ↓ / QQQ ↓ | QQQ -7.4% YTD vs SPY -5.2%. Tech slightly underperforming as AI capex concerns mount. |
Macro Context
DXY
97.5
10Y Real Yield
1.78%
VIX
19.9
SPY/QQQ Ratio
1.066
SPY and QQQ are both declining in a broad risk-off environment, but the divergence is modest. Tech concentration risk is the primary structural driver — QQQ's heavy weighting in mega-cap AI names creates vulnerability if the AI capex cycle disappoints. Rising real yields add pressure to long-duration growth stocks concentrated in QQQ.
Data Freshness
| Source | Cadence | Lag | As of |
|---|---|---|---|
| SPY (public) | End of day | ~24 hours | Apr 8, 2026 |
| QQQ (public) | End of day | ~24 hours | Apr 8, 2026 |
| Correlation | Recalculated daily | ~24 hours | Apr 8, 2026 |
| Returns / Regime | Recalculated daily | ~24 hours | Apr 8, 2026 |
Methodology — SQDI v0.1-beta
1) Ratio Deviation (40%)
score = min(|SPY_QQQ_ratio − baseline_3y| / (baseline_3y × 0.10) × 100, 100)
A 10% deviation from the 3-year average SPY/QQQ ratio = score of 100. Tighter threshold because SPY and QQQ normally move very closely.
2) Correlation Break (35%)
score = min(|corr_30d − 0.95| / 0.2 × 100, 100)
A 0.2 drop from the 0.95 baseline correlation = score of 100. SPY-QQQ baseline is much higher than crypto-equity pairs.
3) Relative Momentum Spread (25%)
score = min(|spread_30d| / 10 × 100, 100)
A 10pp 30D return spread between SPY and QQQ = score of 100. Tighter because they normally move together.
Signal thresholds: LOW (0–24) · ELEVATED (25–49) · HIGH (50–74) · CRITICAL (75–100)
Known limitations: SPY/QQQ ratio is price-based (not market-cap weighted relative); correlation is backward-looking; both indices share significant overlap in mega-cap holdings; v0.1-beta does not account for dividend yield differentials or sector-level decomposition.
Version: v0.1-beta · Research use only — not a trading signal.
Frequently Asked Questions
What is the SPY vs QQQ divergence? ▾
SPY (S&P 500) and QQQ (Nasdaq 100) normally move very closely together with ~0.95 correlation. When they diverge, it signals structural shifts — typically driven by tech concentration risk, sector rotation, or interest rate sensitivity. The current 30D correlation is 0.92 (baseline: 0.95).
What is tech concentration risk? ▾
QQQ is heavily concentrated in mega-cap tech — the top 10 holdings represent ~55% of the index weight. The "Magnificent 7" (Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, Tesla) dominate both QQQ and increasingly SPY. When these names underperform, QQQ falls faster than SPY due to its narrower diversification.
How does market breadth affect SPY vs QQQ? ▾
When market breadth is narrow (few stocks driving returns), QQQ tends to outperform SPY because the same mega-caps dominate both indices but with higher weight in QQQ. When breadth improves and more sectors participate, SPY can outperform as its broader diversification captures gains across value, cyclicals, and defensives.
What drives sector rotation between SPY and QQQ? ▾
Interest rates are the primary driver. Rising real rates compress growth stock multiples (hurting QQQ more), while falling rates favor long-duration tech names. Economic cycle positioning also matters — late-cycle environments favor defensive sectors in SPY, while early-cycle recoveries often favor tech growth in QQQ.
Is this a trading signal? ▾
No. Research-only. SQDI quantifies correlation regime shifts between SPY and QQQ; it does not provide investment advice.
📎 Cite This Data ▾
APA 7th Edition
AhaSignals. (2026). SPY–QQQ Divergence Index (SQDI). Retrieved April 18, 2026, from https://ahasignals.com/spy-qqq-divergence-tracker/
Methodology: v0.1-beta
Data as-of: Apr 8, 2026
Research purposes only. Not investment advice. All index inputs from free, public, clickable sources.
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This page is for informational and research purposes only — not investment advice. Equity markets are volatile. Past correlation patterns do not predict future performance. SQDI methodology version: v0.1-beta. © 2026 AhaSignals. All rights reserved.