What if an index-fund concentration unwind cascades through mega-cap stocks?
A passive-concentration unwind is mechanical: a vol spike forces risk-parity/vol-target deleveraging that sells highest-beta first, so Nasdaq and crypto (BTC, MSTR) lead the S&P lower as credit gaps wider. Rhymes with Feb 2018 Volmageddon and the March 2020 vol-target cascade. Forward angle: record index concentration in a handful of mega-caps means the reflexive feedback loop is more violent now than in 2018, with thinner single-name liquidity to absorb forced sales.
how we built this number — every step
The class rate is measured from our dated, sourced event library (decade-normalized Poisson — the full table is public at base_rates.json). The variant’s share within its class is the analyst’s editorial call, published so you can audit it. A wider range means thinner precedent. Full recipe: methodology · scored at Reality Check.
The butterfly cascade
How this trigger trickles across markets, left → right — the root shock, its first‑order moves, then the ripple effects. Drag any node; tap a market for its real price history.
Resolution timeline — how this probability is moving
Our model's odds (gold) over time vs the crowd's (Polymarket, blue), from the past toward the 1–3 years horizon. Each dot is a real macro event that nudged the probability — green pushed it up, red pushed it down. Tap a dot for the source. The gold path is an illustrative reconstruction anchored to today's estimate — real dated events, not a live re-estimate history.
What it would mean
If this plays out, it is a risk-off shock. A passive/index-fund concentration unwind cascades through mega-cap weights. The trigger decomposes into signed root‑shocks — Risk appetite ▼ · Volatility (VIX) ▲ — which propagate through our causal graph to the markets below.
If it happens — the markets it would move
Biggest moves first. Projected moves are cascade-model priors; hist A–B% = what comparable past events actually did (measured abnormal returns), and model prior · unmeasured marks markets with no analogue backing yet. Tap any market for its price history.
| Market | Class | Projected move | |
|---|---|---|---|
| 1 | Volatility (VIX) VIXon Hyperliquid 📈 chart | Vol | ▲ +6.5% hist -3.21–+3.42% · other way -1.16% (n=12) |
| 2 | Nasdaq 100 NDXon Hyperliquid 📈 chart | Index | ▼ -2.8% hist -1.81–-0.62% · other way +0.24% (n=12) |
| 3 | Tech sector XLK 📈 chart | Equity | ▼ -1.9% hist -1.11–-0.15% · other way +0.36% (n=12) |
| 4 | S&P 500 SPXon Hyperliquid 📈 chart | Index | ▼ -1.5% hist -0.99–-0.17% · other way +0.9% (n=12) |
| 5 | MicroStrategy MSTRon Hyperliquid 📈 chart | Equity | ▼ -1.4% hist -3.03–+0.48% · other way +22.61% (n=12) |
| 6 | Semiconductors SMHon Hyperliquid 📈 chart | Equity | ▼ -1.3% hist -0.7–+0.58% · other way +3.29% (n=12) |
| 7 | Solana SOLon Hyperliquid 📈 chart | Crypto | ▼ -1.1% hist -8.11–+3.31% · other way -1.04% (n=11) |
| 8 | Hyperliquid (HYPE) HYPEon Hyperliquid | Crypto | ▼ -0.9% model prior · unmeasured |
| 9 | Nvidia NVDAon Hyperliquid 📈 chart | Equity | ▼ -1.0% hist -1.0–+0.42% · other way +3.52% (n=12) |
| 10 | Ether ETHon Hyperliquid 📈 chart | Crypto | ▼ -0.8% hist -7.17–+3.95% · other way +3.18% (n=12) |
| 11 | Bitcoin BTCon Hyperliquid 📈 chart | Crypto | ▼ -0.8% hist -2.56–+3.5% · other way +9.45% (n=12) |
| 12 | AMD AMDon Hyperliquid 📈 chart | Equity | ▼ -0.9% hist -2.38–+0.33% · other way -2.89% (n=12) |
| 13 | Broadcom AVGOon Hyperliquid 📈 chart | Equity | ▼ -0.9% hist -0.99–+4.99% · other way +1.42% (n=12) |
| 14 | Micron MUon Hyperliquid 📈 chart | Equity | ▼ -0.9% hist -3.6–+0.83% · other way +9.98% (n=12) |
Probable recommendation
Why we may diverge from history
Trust the cascade short on BTC/MRVL/AVGO/SMH: the positive realized returns are the 2020-COVID and 2024-carry-unwind V-rebounds — a passive-concentration unwind mechanically dumps the exact mega-cap chips those liquidity-rescue windows snapped back.
Historical precedent — what analogous events actually did
Across 27 analogous events (overlap‑weighted), as abnormal returns — market beta stripped, so it's the event's own effect, not the market backdrop. Shown at 20 days (persistent) and 5 days (immediate); ↺ fades = the two horizons disagree. Confidence = consistency × sample × significance.
| Asset | History says | Abnormal (20d · 5d) | Hit | n | Confidence | vs cascade |
|---|---|---|---|---|---|---|
| SOL SOL | SHORT | -7.3% · 5d -4.2% | 100% | 4 | 0.50 | ✓ matches cascade |
| AVGO AVGO | LONG | +4.4% · 5d -1.3% ↺ fades | 73% | 21 | 0.39 | ⚠ differs |
| ETH ETH | SHORT | -6.8% · 5d -6.1% | 72% | 8 | 0.37 | ✓ matches cascade |
| INTC INTC | SHORT | -2.0% · 5d -2.2% | 71% | 26 | 0.33 | ✓ matches cascade |
| Volatility VIX | SHORT | -5.4% · 5d +4.1% ↺ fades | 65% | 24 | 0.28 | ⚠ differs |
| NDX NDX | SHORT | -0.5% · 5d -1.0% | 64% | 26 | 0.22 | ✓ matches cascade |
| SMH SMH | LONG | +1.0% · 5d +0.5% | 65% | 23 | 0.22 | ⚠ differs |
| AMD AMD | SHORT | -1.8% · 5d -1.5% | 64% | 26 | 0.22 | ✓ matches cascade |
| QCOM QCOM | SHORT | -2.2% · 5d -1.5% | 65% | 24 | 0.20 | ✓ matches cascade |
| MRVL MRVL | LONG | +2.1% · 5d +1.5% | 61% | 23 | 0.18 | ⚠ differs |
| Bitcoin BTC | LONG | +4.0% · 5d -1.6% ↺ fades | 59% | 15 | 0.17 | ⚠ differs |
| MU MU | SHORT | -2.9% · 5d -1.1% | 60% | 26 | 0.16 | ✓ matches cascade |
| XLK XLK | LONG | +0.5% · 5d +0.1% | 59% | 23 | 0.13 | ⚠ differs |
| Gold XAU | LONG | +1.3% · 5d +0.0% | 57% | 23 | 0.12 | · |
Why this probability
Passive-concentration unwind plausible but no clean precedent; mega-cap weights still resilient mid-2026. A base‑rate‑anchored prior, continuously scored against what actually happens — not a forecast.