Delayed Vote Counting in U.S. Midterm Elections Could Deliver an Unexpected Market Shock
nashnova research
Man Group warns that options markets are pricing the 2026 US midterms as a routine event, but a delayed vote count — amid elevated rates and fragile AI sentiment — could hit markets harder than expected.
How worried are options markets about this election?
S&P 500 options price implied volatility — the market's built-in bet on how much prices will swing — for Nov 4 (the day after the vote) at roughly 1.2× a normal trading day, about 20% above baseline.
This means → the market treats the midterms as an event whose outcome will be known quickly, in line with past midterm pricing.
For context, tech earnings, US CPI releases, and Fed rate decisions all carry slightly higher volatility premiums than this election — put simply, traders see those routine events as bigger movers.
Who is favoured to win, and what sectors are in play?
Polymarket odds give Democrats a 66% chance of sweeping both the House and the Senate; Republicans have just an 8% chance of a clean sweep.
A Democratic sweep would benefit healthcare and retail but could weigh on investment banks, brokerages, and aerospace & defence stocks.
A Republican sweep is expected to produce the opposite effect — bullish for capital-markets and defence names, bearish for healthcare and retail.
Why is a delayed count an underpriced risk?
Man Group quant researcher Adam Keogh notes: the market's pricing assumes results are known by Nov 4 — but that assumption itself carries risk.
Historical precedent: the 2022 midterms did not finalise Senate composition until December; 2020 Senate control was not settled until a Georgia run-off in January — roughly two months after election day.
In plain terms = the market is betting on a same-night result, but history shows Senate outcomes often drag on for weeks — and options have barely priced in that scenario.
If the count does drag, will it hurt more this time?
Keogh warns the macro backdrop is different now: government borrowing costs sit at multi-year highs, and AI-related sentiment is fragile.
This means → the market's cushion is thinner — high rates raise the cost of capital, and AI stocks are jittery, so the same surprise could sting harder this time.
He stresses this remains a low-probability scenario, but its potential impact is not yet reflected in prices — the textbook definition of tail risk (unlikely to happen, but severe if it does).
市场有风险，内容仅供研究参考，不构成投资建议。