Home Blog GEX Levels

How Precise Are GEX Levels on Futures? An Honest Look at the Limits

Futures GEX levels are modeled estimates converted from index and ETF options. Here is where they come from, why they drift, and how to read them as context zones.

By Hunter (Orion). October 20, 2026. 7 min read.

Short answer: Futures GEX levels are modeled estimates, not measured prices. Most come from index and ETF options converted onto the futures price axis, not from futures options. Treat them as approximate zones. They drift with basis, data delay, and positioning changes.

Modeled, not measured

GEX means gamma exposure. It estimates how much dealers may need to hedge as price moves. A large positive gamma strike can act like a cushion. A large negative gamma area can mean hedging adds to a move.

None of that prints on a tape. No exchange publishes dealer gamma. A provider takes option open interest, runs it through a pricing model, and guesses who holds which side. The output is a model.

So "NQ gamma level at 31,000" on a chart means a model estimate, converted from another market, lands near 31,000. That claim is weaker than it looks. It is still useful. It just has error bars.

Where futures GEX comes from

The deepest Nasdaq 100 options trade on $NDX and $QQQ. For the S&P 500, they trade on $SPX and $SPY. That is where the open interest sits, so that is where most GEX models start.

The process, roughly:

Pull open interest by strike and expiry for the index and ETF options.
Compute gamma for each strike with an options model.
Assign a dealer sign to each position and sum it by strike.
Map those strikes onto the futures price axis.

Step four is the conversion. A $QQQ strike gets scaled to $NDX terms with the current QQQ to NDX ratio. Then the basis shifts it onto $NQ.

So the level on your NQ chart describes options on a related product. It is not GEX built from futures options. Each step adds a bit of error.

Four limits on futures GEX

Modeling assumptions

Most GEX models assume customers buy calls and sell puts, with dealers on the other side. That is a fair default. It is not always true.

A large put sale by a fund can flip the real sign at a strike. So can a covered call program or a structured product hedge. The model cannot see who opened each contract. If the sign is wrong, you get the wrong kind of level, not just the wrong price.

Conversion and basis drift

$NQ trades at a premium to $NDX. That gap is the basis. It reflects interest rates minus expected dividends until expiry. It is not fixed.

The basis shrinks as the contract nears expiry. It moves a little through the day. It jumps when the market rolls to the next quarterly contract.

Convert a level with a 200 point basis in the morning. If the basis is 185 points by the afternoon, the level has moved. Ratio rounding from $QQQ to $NDX adds a few more points of slack.

Data delay

GEX is only as current as its inputs. Futures data is often delayed unless you pay exchange fees. If the futures price behind a conversion is 15 minutes old, so is its basis.

On a fast morning, NQ can travel 100 points in that window. The level is not broken. You are seeing it later than the bars. In Titan, CME E-mini futures snapshots are delayed 15 minutes. Better you hear that now than find out mid session.

Changing open interest

Open interest is published once a day, after the close. Intraday flow does not show up until the next update. Heavy 0DTE volume is a big part of that flow.

A strike that looked heavy at the open can stop mattering by lunch. Same day options expire or get closed, and their gamma changes fast. Theta decay on 0DTE options is one reason the gamma picture shifts so quickly late in the session.

How to use GEX as context, not signals

I treat every converted level as a zone, not a line. On $NQ I give it 20 to 30 points of width. That width absorbs basis drift and rounding.

Here is how I fold it into a read:

I mark the larger GEX zones before the open. Then I check the current basis and shift them if needed.
I let price structure do the work. A zone matters more to me when it lines up with a fair value gap or an inverse fair value gap on the 5-minute chart. My 5-minute IFVG guide for NQ covers that piece.
I note where price sits against the main positive gamma area. Above it, I expect choppier, mean reverting behavior. Below a negative gamma area, I expect moves to stretch further.
I recheck after the quarterly roll and after major news.

GEX does not tell me when to act. It tells me where the market might behave differently. Entries, stops, and risk are the trader's call. Read the risk disclosure before you lean on any tool.

Example on the 5-minute NQ chart

Illustrative example only. Hypothetical, round numbers. No trade was taken and no outcome is implied.

Say $NDX closed the prior day near 30,800. A model shows a large positive gamma strike there. $QQQ is near 755, and its heavy 755 strike scales to about the same NDX area.

At 9:30 ET, $NQ is near 31,000. The basis is about 200 points. The converted zone on the 5-minute NQ chart centers near 31,000. I would draw it from 30,985 to 31,015.

By early afternoon, the basis is down to about 185 points. Same NDX strike, new conversion. The center now sits near 30,985. A zone left over from the morning sits about 15 points high.

Now add a 15 minute data delay. Price ran from 31,050 down to 30,980 in a fast stretch. The snapshot on screen shows the market from before that move. Read the old line as exact and you are reading a level that already shifted under the bars.

So I would redraw the zone with the current basis and keep it wide. Then I would watch how 5-minute bodies close around it. If price dips into the zone and closes back above 31,000, the read that positive gamma is cushioning price holds. If bodies close through 30,970, that read weakens.

The zone gives context. The candles give the information.

Common mistakes

Treating a level as a tick exact price. A converted level carries several points of error. A single line invites false precision.
Ignoring the roll. When the front month changes, the basis jumps. Levels converted with the old contract's basis land in the wrong place.
Comparing providers number for number. Two models with different assumptions print different levels. Neither one is the true level.
Reusing yesterday's map without checking. Open interest updates once a day. Intraday 0DTE flow can change which strikes matter.
Reading GEX in isolation. A gamma zone with no structure around it says little about timing.
Adding lines for more insight. Ten minor strikes clutter the chart. I keep the two or three largest zones.

FAQ

Is GEX on NQ calculated from NQ options?

Usually not. Most futures GEX is built from $NDX and $QQQ options and then converted. Options on NQ futures exist, but most Nasdaq 100 options open interest sits in the index and ETF. Ask any provider which source they use.

Why do levels differ between providers?

Each provider makes its own choices. They pick which expiries to include and how to sign dealer positions. They pick a basis source and a QQQ to NDX ratio. Small differences at each step add up to levels several points apart.

Does basis change the levels during the day?

Yes, a little. The basis drifts with rates and time to expiry, and it can move a few points intraday. A conversion done at the open can sit 10 to 20 points away from one done in the afternoon.

Can GEX tell me where price will go?

No. GEX estimates where dealer hedging might add friction or fuel. Price can move straight through a large gamma zone. I use it to frame the session, not to pick a direction.

Where Zero-G fits

Titan is a GEX market map for dealer pressure and gamma levels, sold only on titangex.com. Its futures gamma map for ES, NQ, YM, and RTY is Pro only. It converts index and ETF GEX onto the futures price axis. It does not build GEX from futures options. That is the method covered above.

You can open the free Preview with sample tickers SOFI and RBLX first. Futures are not included in Preview. For Titan Map details, see the Titan page and pricing.