Factor Lab Daily Brief 2026-09-07
Monday pre-market run with no new US trading data (last trading day Fri 09-04) — all numbers identical to the weekend brief: momentum reversal persists for an 11th consecutive day, market-wide momentum IC -0.2225, ICIR -1.96, t-stat -12.07, only 2.6% positive cross-sections, long-short spread +6.76% monotonic; IT sector momentum IC -0.516 (long-short +20.71%) remains the most negative sector, Financials (IC -0.300) and Industrials (IC -0.252) keep weakening, Real Estate remains the only significant positive-momentum sector (IC +0.197, p=0.006); volatility factor IC +0.034 still insignificant (p=0.266), value factors stay broken. Anomaly detection: same momentum sign-flip alarms as yesterday persist (11th day), no new alert types; six sectors' z-scores all in the 2.2~2.9 band (IT/Financials/Industrials/Utilities/Cons Disc/Cons Staples), Real Estate no longer triggers, Utilities p-value lost significance (0.236) alert retained.
Full-Factor IC Test (21-day holding)
| Factor | IC Mean | ICIR | t-stat | p-value | % Positive IC | L/S Return%(Q1-Q5) |
|---|---|---|---|---|---|---|
| EP | -0.048 | -0.52 | -3.99 | 0.000 | 28.3% | +2.98% |
| BP | +0.003 | +0.05 | +0.35 | 0.728 | 48.3% | +1.13% |
| FCF Yield | -0.035 | -0.54 | -4.14 | 0.000 | 25.0% | +2.48% |
| ROE | -0.025 | -0.68 | -5.26 | 0.000 | 26.7% | +0.76% |
| Mom | -0.2225 | -1.96 | -12.07 | 0.000 | 2.6% | +6.76% |
| Vol | +0.034 | +0.18 | +1.13 | 0.266 | 61.5% | -1.23% |
| Size | -0.066 | -0.90 | -5.55 | 0.000 | 20.5% | +3.99% |
Key observations:
- Monday pre-market run with no new US trading data: last trading day remains US Fri (09-04); all numbers are identical to the weekend brief — a pre-market snapshot, not new market action.
- Momentum reversal persists for an 11th consecutive day (key): Momentum IC -0.2225, ICIR -1.96, t-stat -12.07, only 2.6% of 39 cross-sections positive. Low-momentum quintile (Q1) averaged +6.71%, high-momentum (Q5) -0.04%, long-short spread +6.76% monotonic.
- IT remains the most negative sector (key): Sector IC -0.516, long-short spread +20.71% — the correction in previously strong tech names is intact.
- Financials and Industrials keep weakening: Financials IC -0.300, only 2.6% positive cross-sections, long-short +5.65% monotonic; Industrials IC -0.252, spread +8.84%.
- Real Estate remains the only significant positive-momentum sector: IC +0.197, ICIR +0.63, 70.8% positive, p=0.006 — defensive/safe-haven tilt persists, though it has drifted from +0.209 on 09-04 to +0.197.
- Value factors stay broken: EP (ICIR -0.52), FCF Yield (ICIR -0.54), ROE (ICIR -0.68) all keep significant negative IC.
- Volatility factor still insignificant: Vol IC +0.034, p=0.266 — low-vol outperformance signal still missing.
Sector Momentum Breakdown
| Sector | Stocks | IC Mean | ICIR | % Positive IC | L/S Return%(Q1-Q5) |
|---|---|---|---|---|---|
| Information Technology | 73 | -0.516 | -2.26 | 5.1% | +20.71% |
| Financials | 76 | -0.300 | -1.88 | 2.6% | +5.65% |
| Industrials | 79 | -0.252 | -1.78 | 7.7% | +8.84% |
| Consumer Staples | 36 | -0.139 | -0.88 | 20.5% | +5.71% |
| Consumer Discretionary | 48 | -0.087 | -0.55 | 33.3% | +2.65% |
| Health Care | 59 | -0.078 | -0.34 | 41.0% | +1.18% |
| Utilities | 31 | -0.035 | -0.20 | 41.0% | +0.27% |
| Real Estate | 31 | +0.197 | +0.63 | 70.8% | -3.54% |
Sector notes:
- IT remains the most negative sector: Sector momentum IC -0.516, long-short spread +20.71% — the main driver of market-wide momentum reversal, with the correction in previously strong tech names intact.
- Financials and Industrials keep weakening: Financials IC -0.300, only 2.6% positive cross-sections, long-short +5.65% monotonic; Industrials IC -0.252, spread +8.84%.
- Real Estate remains the only positive-momentum sector: IC +0.197, ICIR +0.63, 70.8% positive, p=0.006 — defensive/safe-haven tilt persists, though momentum has eased from +0.209 on 09-04 to +0.197.
- Utilities momentum keeps failing: Utilities IC -0.035 (p 0.236) insignificant; momentum signal remains absent.
Anomaly Detection (🔴/⚠️)
Today’s alarms mirror yesterday — persistence markers of the momentum-reversal regime (11th day), no new alert types:
| Sector | Latest IC | Historical Mean | z-score | Alert |
|---|---|---|---|---|
| Information Technology | -0.516 | +0.395±0.320 | -2.85 | 🔴 sign-flip + ⚠️ >2σ low |
| Financials | -0.300 | +0.232±0.191 | -2.79 | 🔴 sign-flip + ⚠️ >2σ low |
| Industrials | -0.252 | +0.197±0.169 | -2.66 | 🔴 sign-flip + ⚠️ >2σ low |
| Utilities | -0.035 | +0.167±0.082 | -2.46 | 🔴 sign-flip + ⚠️ >2σ low + p 0.040→0.236 lost significance |
| Consumer Discretionary | -0.087 | +0.203±0.122 | -2.37 | 🔴 sign-flip + ⚠️ >2σ low |
| Consumer Staples | -0.139 | +0.155±0.132 | -2.22 | 🔴 sign-flip + ⚠️ >2σ low |
Note: the alert baseline’s historical mean covers the May–June positive-momentum era (+0.1 to +0.4); momentum turned negative in late August and has persisted for over two weeks, so these “positive-to-negative” alerts are persistence markers of an existing regime, not new discontinuities today. vs yesterday: all six sectors’ z-scores eased slightly (2.22~2.85 band, baseline std widened with the new sample), Real Estate (+0.197) still triggers no alarm, everything else unchanged.
Summary
Monday pre-market run with no new US trading data (last trading day Fri 09-04); momentum reversal persists for an 11th consecutive day: momentum IC -0.2225, IT sector IC -0.516 (long-short +20.71%), Financials and Industrials keep weakening, Real Estate remains the only significant positive-momentum sector (though its momentum is easing). The volatility factor is still insignificant and value factors stay broken. Pre-market snapshot with zero new information — all weekend conclusions stand.
Risk signals to watch:
- Momentum reversal persists with no new information: today’s numbers are identical to the weekend brief (no US trading over the weekend or pre-market); reversal regime at day 11 with ICIR -1.96, t=-12.07 still statistically extreme
- Tech correction not stabilized: IT sector IC -0.516 near cycle low, long-short +20.71% — chasing recently strong tech names near-term remains risky
- Real Estate positive momentum easing: IC drifted from +0.209 on 09-04 to +0.197; the only positive-momentum sector is losing defensive steam — if it falls back into the historical mean band it would trigger a new low alarm
- Volatility factor still insignificant (p=0.266): low-vol outperformance signal missing; breadth confirmation of any style shift still absent
Strategy takeaway: the momentum-reversal regime is unchanged and there is no new data — existing conclusions hold. Chasing recently strong stocks remains risky, value factors stay broken, and defensive (Real Estate) is relatively preferred but its momentum is fading and needs watching. Maintain low-momentum exposure and wait for a stabilization signal before rotating back. The first US trading day of the week (opens 21:30 CST tonight) will confirm whether the reversal persists or shows signs of stabilizing.