The Cboe Volatility Index (VIX) finished Friday at 19.42, a sharp 12.91% increase for the session, yet the weekly change was a modest decline of 0.15% from the prior week's close of 19.45 on October 23, according to Cboe data.
That flat weekly performance masks a week of two halves. The VIX drifted lower through midweek, touching 16.91 on Wednesday, before rebounding to 17.20 on Thursday and then spiking on Friday. The Friday jump added 2.22 points, largely reversing the earlier slide. On a monthly basis, the picture is more pronounced: the VIX ended September at 16.34, so October's close represents an 18.85% increase.
Equity markets ended the week mixed. The S&P 500 slipped 0.6%, while the Nasdaq Composite fell 2%, according to the Associated Press. Small-cap stocks outperformed, with the Russell 2000 gaining 1.3%. These figures are rounded price returns and exclude dividends.
Friday's VIX close also understated the day's intraday volatility. The index reached a session high of 23.93 before pulling back, a retreat of 18.85% from that peak to the close. This highlights that the closing print can differ significantly from the day's extremes.
The VIX is not a stock index return; it is an option-based measure of expected S&P 500 volatility over the next 30 days, annualized. Both puts and calls are used in its calculation, as Cboe explains. To translate the VIX into a one-month expected move, divide by the square root of 12: 19.42 / √12 ≈ 5.6%. This represents the size of a potential move in either direction, not a guaranteed range.
A 12.91% rise in the VIX does not imply a corresponding stock market loss. It simply reflects a percentage change in implied volatility. Moreover, the closing value does not reveal whether traders were buying protection, selling options, or closing positions; that requires separate trading data.
Analyst commentary also added context. Nathan Peterson, Schwab's director of derivatives research and strategy, maintained a "higher volatility" forecast for the coming week in his October 30 note, along with a "moderately bearish" outlook. He also flagged a possible rebound after heavy selling in technology stocks. Peterson's note referenced an intraday VIX reading near 22, above the official close, and cited upcoming earnings, Tuesday's midterm elections, and Friday's employment report as potential catalysts.
Looking ahead, the Bureau of Labor Statistics will release September job-openings data on Tuesday, November 3, at 10:00 EST, followed by the October Employment Situation report on Friday, November 6, at 08:30 EST. These reports cover different periods and measure distinct aspects of the labor market. Investors should also watch for election-related policy uncertainty and corporate earnings, which could quickly reprice regulatory and execution risks. As always, option-based estimates can shift rapidly, leaving little time for overnight position adjustments.
