The VIX Rule of 16 and GEX

The VIX closed at 16.34 on 2026-09-01. What does that mean for tomorrow?

Most traders can't answer that. The VIX is an annual number and nobody trades a year at a time.

Sooon, a member of the GEX Edge Discord, wrote up the fix. This is his method, in our words. The entry and exit rules at the end are his exactly.

One example runs the whole way through, and it is real: the 2026-09-01 close. SPX 7,631, VIX 16.34.

The Rule of 16

Divide the VIX by 16. That is the expected one-day move, in percent.

VIX 16 = 1% per day.

VIX 24 = 1.5% per day.

VIX 32 = 2% per day.

Why 16? There are 252 trading days in a year. The square root of 252 is 15.9. Traders round it to 16.

Now multiply by the index. VIX 16.34 ÷ 16 is 1.02%. SPX 7,631 times 1.02% is 78 points. So the expected band runs from 7,553 to 7,709.

What 78 points actually means

That 78-point band is one standard deviation. Call it 1 SD.

68% of days close inside 1 SD.

95% of days close inside 2 SD, or 156 points.

Here's the catch: the market breaks the band more often than a textbook says it should. And when it breaks, it usually breaks down, not up.

So 1 SD is the edge of a normal day. Not the edge of a possible day.

Why this matters if you sell spreads

A credit spread is simple. You sell one option, buy one further out, and collect cash up front. That cash is your credit. The option you sold is your short strike.

Price stays on your side of the short strike, you keep the credit. Price crosses it, you start losing.

Here's where most people go wrong. They sell the short strike a fixed 75 points from spot. Every day. Same distance.

Look at what that does:

VIX 12: 1 SD on SPX 7,631 is 57 points. Your 75-point strike is outside the band. Fine.

VIX 28: 1 SD is 134 points. Your 75-point strike is deep inside the band. You are selling a coin flip and calling it income.

Same trade. Same distance. Completely different risk. And nothing on your screen told you.

The fix: set your short strike at 1 to 1.5 times the daily expected move. At 78 points, that is 78 to 117 points from spot. Near end when the tape is calm. Far end when it is not.

And remember what fat premium is. It is the market paying you for a bigger expected move. It is never free.

The VIX can't tell you which way

The Rule of 16 gives you distance. It says nothing about direction.

GEX does.

GEX, gamma exposure, measures how dealers have to hedge as price moves. Dealers are the market makers on the other side of most option trades. Their hedging is mechanical, and it decides whether today's band holds or breaks. The full playbook is in positive vs negative gamma.

Two regimes:

Dealers long gamma. They buy dips and sell rips. Price gets pulled back to the middle. The band holds. Both sides are fair game for selling premium.

Dealers short gamma. They sell into drops and buy into rallies. They push the move. The band breaks. Tight spreads get run over.

Three levels on the GEX Edge dashboard tell you which regime you are in.

The Gamma Flip. Above it, dealers calm the tape. Below it, they chase it.

The Call Wall. The strike with the most call gamma. Acts like resistance.

The Put Wall. The strike with the most put gamma. Acts like support, as long as price is above the Gamma Flip. Below the flip, dealers stop defending it. It may slow a drop. Do not bet on it holding.

Math plus walls

A 1 SD level on its own is a candidate. Nothing more.

Back to the example. SPX 7,631, VIX 16.34. Put side 1 SD is 7,631 minus 78, or 7,553. Nearest SPX strike: 7,550.

Now open GEX Edge. Suppose the Put Wall is at 7,550.

That is the trade. The math says 7,550 is the edge of normal. Dealer positioning says 7,550 is where hedging kicks in. Two independent reasons, same price.

No wall at your SD level? Then it is a number, not a level. Wait.

The real read, 2026-09-01 close

Run the routine on the actual numbers. The band below is what the indicator would have drawn.

SPX 7,631. VIX 16.34. 1 SD is 78 points, so the band is 7,553 to 7,709.

Gamma Flip: 7,673. Spot is 42 points below it. Dealers are in chase mode, not calm mode.

Call Wall: 8,000. Put Wall: 7,000. Neither one is anywhere near a 1 SD level.

Verdict: pass on the put side. Spot is under the flip and there is no wall at 7,553 to lean on. The call side has the Gamma Flip sitting between spot and +1 SD, which is a level, but not a wall. Far end of the band or no trade.

That is the method doing its job. Most days, the answer is wait.

Levels from FlashAlpha, the same feed behind the GEX Edge dashboard, as of the 2026-09-01 close. They move every session, so run it fresh.

Put the band on your chart

Nobody does this math at 9:30. Let an indicator do it.

On TradingView, search the public library for "expected move" or "implied move". Pick one that reads the VIX or the ATM straddle and plots the 1 SD and 2 SD bands on the daily. Set it once and forget it.

If you want to know what it is drawing: close × (1 ± VIX ÷ 1600). That is VIX ÷ 16 as a decimal. That is the whole indicator.

Then overlay the Gamma Flip, Call Wall, and Put Wall from GEX Edge. An SD line and a wall on the same price is your candidate strike. It takes 30 seconds.

Sooon's rules

These are his SPX spread rules, unchanged.

1. Wait for the premium. The target is $0.80 to $1.00 of credit on a 10 to 15 point wide spread. In the example: sell the 7,550 put, buy the 7,540 or 7,535 put. If the level is right but the credit is thin, pass. Cheap credit at a good level is still a bad trade.

2. Give it room. Theta, the daily decay in option value, works for you every hour the trade is open, as long as price stays outside your short strike. So the stop is wide on purpose: close when the spread trades at 3x the credit you collected. Sold it for $1.00, close it at $3.00. Getting stopped on a wiggle that decays to zero by expiration is how most spread sellers lose. Size for that stop. Never widen it after entry.

3. Take profit early. Close at 60% to 70% of the credit. Sold for $1.00, buy back at $0.30 to $0.40. The last 30 cents decays slowly and is not worth holding into expiration for.

4. No event days. No spreads around FOMC or any major midday release. Those prints have reversed hard and gone straight through 1 SD. The daily math averages quiet days and event days together, so it understates what one event day can do. A perfect SD and wall overlap does not survive a Fed surprise.

What it looks like on a 5-minute chart

Here is the 2026-09-01 session with the marks on it.

Prior close 7,684. VIX at the open 16.06. Band: 77 points, so −1 SD sits at 7,607. Spot opened at 7,635, already under the Gamma Flip. Rule 6 applies: far end of the band, so the short strike goes to 7,515.

Price ran up to 7,664 before noon and stalled right under the flip. It sold off into 2:45, touched 7,611, four points above −1 SD, and held. The short strike was never in play.

The exit mark is at 2:00. By then most of the credit has decayed. Rule 3 says take it. Do not sit through the 2:45 test for the last 30 cents.

The routine

1. Check the calendar. FOMC or a major midday release means no spread today.
2. Open your chart. The expected-move indicator has already drawn the 1 SD band for the day. Read the two levels off it. No indicator? VIX ÷ 16 × SPX, once, and draw two lines.
3. Open GEX Edge. Find the Gamma Flip. Is spot above it or below it?
4. Find the Put Wall and the Call Wall. Does either one sit at or just outside a 1 SD level?
5. Above the Gamma Flip: sell the side where a wall and a 1 SD level overlap. No overlap, no trade.
6. Below the Gamma Flip: the Put Wall is not a floor. Push the short strike to the far end of the 1 to 1.5x range, recheck often, or stand aside.
7. Enter only at your credit. $0.80 to $1.00 on a 10 to 15 wide.
8. Stop at 3x the credit, on the spread price.
9. Close at 60% to 70% of the credit.

Bottom line

VIX ÷ 16 tells you how far. GEX tells you which side.

Sell where a 1 SD level lands on a wall, above the Gamma Flip, on a day with no event. Everything else is a pass.