Lab · Regime Detection · S&P 500

Financial markets move through distinct regimes

Applied to the S&P 500 from 2006 to 2026, the model identified three regimes, Boom, Mid-Market, and Danger, each with measurably different risk and return characteristics.

Run date: April 20, 2026 · Folds: 7 · Period: 2006-2026
MacroContext regime model · Week 17, 2026
The model is reading Mid-Market.

Mid-Market is the baseline state. No acute stress. No strong directional momentum.

Regime Classification April 20, 2026
Mid-Market
Since April 20, 2026
Duration 56 days
Prior regime Boom
Classification Week 17, 2026

No acute stress signals are present. Credit spreads, volatility, and price structure are all within normal ranges. The model reads current conditions as Mid-Market — the baseline state that describes the unremarkable majority of market history.

Boom SR
1.34
Mid SR
0.50
Danger SR ◀
0.30
Walk-forward out-of-sample · 2006-2026

The model identified major market regimes as they occurred across two decades.

The regimes caught major market turning points in 2008, 2020, and 2022.
Boom Mid-Market Danger S&P 500
S&P 500 price from 1,270 in 2006 to approximately 5,600 in 2026 with regime background shading.
MacroContext regime detection · https://joshuampeck.com/lab/regime-detection
The Three Regimes

The model produces one of three classifications. Each regime has a distinct statistical character — not in average returns, but in the distribution of risk around those returns.

Boom

Broad market participation, trending prices, compressing volatility, positive momentum across sectors.

21-day Sharpe 1.34
Mean return (Fwd. 21D) +1.78%
Volatility (ann.) 21.23%
Observations 1,142

The environment in which equity risk is best compensated. Not a signal to lever up — a signal that the wind is at your back.

Mid-Market

No acute stress signals. No strong directional momentum. Markets are moving without a clear behavioral thesis in either direction.

21-day Sharpe 0.50
Mean return (Fwd. 21D) +0.54%
Volatility (ann.) 12.13%
Observations 2,344

The default state. Markets spend more time here than anywhere else. The absence of a strong signal is itself information.

Danger

Credit spreads widening, volatility expanding, momentum deteriorating, macro indicators signaling stress.

21-day Sharpe 0.30
Mean return (Fwd. 21D) +0.51%
Volatility (ann.) 26.37%
Observations 1,508

Same average return as Mid-Market. Twice the downside risk. The mean hides the distribution — Danger periods produce the left tail events that define drawdowns.

The mean return in Danger is nearly identical to Mid-Market. The Sharpe ratio is not. That gap — 0.30 versus 0.50 — is the entire argument for regime awareness.

Important disclosures

The MacroContext regime classification system is provided for informational and research purposes only. It does not constitute investment advice, a solicitation, or a recommendation to buy or sell any security or financial instrument. Nothing on this page should be construed as legal, tax, or investment advice.

Past performance of the regime-weighted equity curve shown above is hypothetical and based on walk-forward out-of-sample simulation applied retroactively to historical data. It does not represent actual trading results and has not been verified by any independent third party. Hypothetical performance results have inherent limitations: they are prepared with the benefit of hindsight, do not reflect the impact of material economic and market factors that may have affected actual investment decisions, and do not account for transaction costs, slippage, or taxes. Actual results will differ.

MacroContext regime classifications are produced by a quantitative model that may be incomplete, inaccurate, or subject to revision. The model has failed formal validation criteria on the current run. Full validation results, including pass/fail metrics, are available on the methodology page. AppliedComplexity Research makes no representations as to the accuracy or completeness of the information presented and accepts no liability for decisions made in reliance on this material.

Not an offer to sell or solicitation of an offer to buy any security. For informational use only.