Event Volatility: FOMC, CPI, NFP

What an event is

In options trading, an "event" is a scheduled release of information that has historically produced large market moves. Three categories dominate:

• Macro events. FOMC rate decisions (eight per year), CPI inflation prints (monthly), NFP employment data (monthly), GDP releases. Move broad indices.
• Earnings events. Quarterly company-level reports. Move single names dramatically.
• Binary events. FDA decisions, M&A votes, court rulings, election outcomes. Often produce one-sided large moves.

Each event has a predictable timing and an unpredictable outcome. Options markets price the event in advance by raising the IV of contracts that span the event date.

The event premium

In the days leading up to a known event, IV rises. The increase is concentrated in expiries that include the event date. Expiries before the event do not move much. Expiries well after the event do not move much. The bump is local to the event.

This is why the term structure can briefly invert into backwardation around major events. The 7-day IV captures the event; the 90-day does not. The front-end premium is the cost of the event uncertainty.

Vol crush

After the event passes, the IV that was pricing the uncertainty collapses. The collapse is fast (often within minutes of the data release) and severe. A 30-vol-point IV on the day before earnings can drop to 18 vol points within an hour after the report.

This vol crush is the central risk for anyone holding long options through an event. Even if the underlying moves significantly, the lost vol can wipe out the directional gain. Long straddles and strangles bought in the days before earnings are statistically losing trades on average, primarily because of vol crush.

FOMC dynamics

Federal Open Market Committee meetings happen eight times per year, on a published schedule. The FOMC statement is released at 2:00 PM ET on the second day of the two-day meeting. The Fed Chair's press conference begins at 2:30 PM ET.

SPX IV typically rises in the days before the meeting and peaks on the morning of the announcement. The largest move usually happens during the press conference rather than at the statement release. By 3:30 PM ET, IV has often fully crushed for the front expiries.

Trading FOMC days requires either a strong directional view (and willingness to absorb the vol crush against you) or a vol-crush-harvesting strategy that deliberately sells the front-end premium beforehand.

CPI dynamics

CPI is released monthly at 8:30 AM ET. The reaction window is shorter and more intense than FOMC. The largest move often happens in the first 15-30 minutes after the release.

CPI has become more market-moving since 2022 because inflation became the dominant macro concern. Pre-CPI IV in SPY can be 30-40% higher than the comparable expiry not spanning the event. Post-release crush is correspondingly severe.

Earnings dynamics

Single-name earnings produce the most dramatic vol-crush patterns. A liquid name like NVDA might trade with 40-60 vol-point IV in the front week before earnings, then crush to 30-35 vol points within an hour of the report.

The implied move on earnings is usually 5-10% for a typical large-cap stock, much higher for high-beta or volatile names. Stocks that consistently move less than their implied move are good candidates for systematic short-vol earnings programs. Stocks that consistently exceed their implied move are not.

Trading around events

Three approaches to event vol:

1. Avoid. Close all options positions before the event. Reopen after the crush. Sacrifice some opportunity for safety.
2. Sell the premium. Sell calendars, iron condors, or directional spreads that benefit from the vol crush. Profit if the move is contained.
3. Buy the move. Long straddles or directional bets based on a view of how the market will react. Profitable only if the actual move exceeds the implied.

Most systematic short-vol programs explicitly avoid event windows. The variance risk premium that makes short-vol profitable assumes a roughly normal distribution of outcomes. Events introduce fat-tailed binary outcomes that the standard model does not handle well.

Earnings filter for short-vol programs

In our internal VRP system, the BUY_VOL regime activation depends partly on event proximity. The signal logic explicitly accounts for FOMC, CPI, and NFP dates because the variance risk premium behaves differently in event-adjacent windows. This is not a refinement; it is structural.

Any short-vol program that does not adjust for events is implicitly betting that the event vol will mean-revert to historical patterns. Sometimes it does. Sometimes the event delivers a 4-sigma surprise and the position never recovers.

What you carry forward

• Scheduled events create local bumps in the IV term structure.
• Vol crush after events is fast, severe, and historically the most reliable pattern in options markets.
• Implied move = ATM straddle price as % of spot. It is the breakeven for long event vol.
• Most systematic short-vol programs avoid event windows.
• Earnings, FOMC, CPI, and NFP are the canonical event categories to track.