CH. Résia Letter — 2026-09-30
CH. Résia Letter
Premium Daily Market Intelligence — September 30, 2026
Institutional-style macro and cross-asset briefing generated from the Bayesian market stack.
1. Executive summary
What matters today
- S&P 500 rose 0.52% over one month, with a 12% risk-off posterior.
- Nasdaq fell 0.09% on the day, with model volatility at 16.6% annualized.
- USD/KRW fell 0.41% on the month to 1,352.84 — a firmer won that eases the external backdrop for Korean risk assets.
- Rates are still the macro stress point: the U.S. 10-year yield sits at 5.26% with High vol conditions.
- Near-term Bayesian forecast stays defensive: SPX ▼, US10Y ▲, Gold ▲, USD/KRW ▼, Oil ▼.
- Single-name opportunity remains selective rather than broad: top-ranked long is WST with score 0.788 and 65.0% 20-day upside probability.
House view
The macro tape still favors selective exposure over broad beta. Risk-off probabilities remain elevated across equities and rates, while FX pressure and high rates volatility keep the overall regime restrictive.
2. Visual dashboard
The matrix above is the fastest read on the system: posterior regime conviction is still skewed toward defense, while current volatility remains too elevated to support a clean risk-on chase.
3. Cross-asset scoreboard
| Asset | Last | 1D | 1W | 1M | Regime | Volatility |
|---|---|---|---|---|---|---|
| SPX | 7,670.84 | -0.17% | -0.46% | +0.52% | Risk-On | Low vol |
| NASDAQ | 26,797.54 | -0.09% | -0.51% | +2.67% | Risk-On | Low vol |
| KOSPI | 6,889.74 | -2.70% | -0.07% | +1.49% | Risk-Off | Low vol |
| KOSDAQ | 846.58 | +0.25% | +2.35% | +0.97% | Risk-On | Low vol |
| US10Y | 5.26 | +0.29% | +2.76% | +9.57% | Risk-On | High vol |
| USDKRW | 1,352.84 | -0.49% | -0.71% | -0.41% | Risk-On | Moderate vol |
| Gold | 4,210.70 | +1.01% | -2.49% | -4.22% | Risk-Off | Moderate vol |
| Oil_WTI | 89.24 | -3.63% | -3.17% | -1.09% | Risk-Off | Moderate vol |
SPX is lower on the day, Nasdaq is lower, and USD/KRW remains in a calm but still fragile transition state.
4. Bayesian regime & forecast read
One-day directional bias
| Variable | Direction | Forecast return | Uncertainty | Persistence |
|---|---|---|---|---|
| SPX | ▼ | -0.17% | 0.97% | 0.900 |
| US10Y | ▲ | 0.27% | 1.19% | 0.898 |
| Gold | ▲ | 0.89% | 2.04% | 0.894 |
| USDKRW | ▼ | -0.45% | 0.98% | 0.899 |
| Oil_WTI | ▼ | -3.24% | 4.05% | 0.878 |
Dominant cross-effects
- Oil_WTI → Gold: coefficient 0.0043
- Oil_WTI → SPX: coefficient 0.0039
- Gold → Oil_WTI: coefficient 0.0030
5. Equity selection
The stock scanner processed 560 names. Opportunity remains concentrated in a narrow group of resilient names rather than across the market.
Top-ranked longs
| Ticker | Price | Score | P(up 20d) | Bull regime | Ann. vol | 1M |
|---|---|---|---|---|---|---|
| WST | 376.63 | 0.788 | 65.0% | 91.3% | 20.5% | +11.22% |
| TMO | 679.61 | 0.786 | 62.7% | 95.0% | 24.1% | +13.17% |
| CRUS | 120.80 | 0.761 | 59.0% | 93.1% | 32.3% | +10.75% |
| GILD | 151.28 | 0.749 | 55.2% | 94.8% | 22.5% | +0.91% |
| AES | 14.86 | 0.749 | 54.8% | 96.7% | 2.6% | +0.61% |
Lowest-ranked names
- TTD (Trade Desk): score 0.273, 20-day upside probability 40.9%, monthly move -12.55%.
- EFX (EFX): score 0.263, 20-day upside probability 23.7%, monthly move -24.37%.
- GEN (GEN): score 0.240, 20-day upside probability 29.3%, monthly move -30.55%.
6. Macro monitor
United States
| Series | Latest | Change | Trend | Date |
|---|---|---|---|---|
| CPI | 334.13 | +0.40% | Mixed | 2026-08-01 |
| Unemployment | 4.10 | 0.00% | Downtrend | 2026-08-01 |
| US10Y | 5.24 | +0.07pp | Mixed | 2026-09-28 |
| US2Y | 4.92 | +0.11pp | Mixed | 2026-09-28 |
| VIX | 16.07 | +8.07% | Mixed | 2026-09-28 |
| DXY | 120.33 | -0.18% | Mixed | 2026-09-25 |
| Initial_Claims | 197,000.00 | -0.51% | Mixed | 2026-09-19 |
| Retail_Sales | 737,763.00 | +1.13% | Mixed | 2026-08-01 |
Korea
| Series | Latest | Change | Date |
|---|---|---|---|
| Policy rate | 3.00 | +0.25pp | 202608 |
| CPI | 120.05 | +0.23% | 202608 |
| Current account | 42,078.00 | -15.39% | 202607 |
8. Bottom line
This is still a preservation-first tape. The sellable setup is not broad bullishness but disciplined selection: keep duration of conviction short, prefer names with strong posterior upside and contained volatility, and treat macro rallies as tactical until rates and FX stress materially cool.
Methodology: Bayesian regime switching, stochastic volatility filters, Bayesian VAR, and a cross-sectional stock-scoring model.
Data sources: FRED, ECOS, Yahoo Finance, CoinGecko, and internal processed datasets.
This report is generated from model outputs and formatted into a research product. It is not investment advice.
