GEX AcademyCorrelation & instruments
SPX, SPY, ES, NQ, NDX, QQQ — a wall of tickers that all seem to track the same thing. They do, and they don't. Understanding how they relate is what lets you trade options-derived levels on a futures chart, exactly the way GEX Levels does.
One market, several instruments
The S&P 500 and the Nasdaq-100 each exist in three tradable forms, and each form has a different crowd behind it:
They move together because they track the same underlying basket. But their options are held by different participants and settle differently, so their positioning — and their walls — can sit a few points apart. That small disagreement is itself information.
The 10× relationship
SPY is roughly one-tenth of SPX. If SPX is 5,000, SPY is around 500. NDX to QQQ is a larger, less round ratio, but the same idea holds. This is why a SPY level and its SPX equivalent are the "same" line at a 10× scale — and why converting between them must be done carefully.
Say the heaviest call gamma on the S&P sits at SPX 5,050 — the Call Wall. On SPY that is about 505. On the ES future, which tracks the index but trades at its own quote with a small basis, that same wall lands at whatever price corresponds through the current ratio — perhaps ES 5,045. Three instruments, one dealer level, three prices. A futures trader who knows this can trade the exact institutional level on the chart they actually execute on.
Why futures traders care about options they never trade
Here is the bridge that makes this whole Academy relevant to NQ and ES traders. Futures like ES and NQ have no meaningful options market of their own — but they track indices that have huge ones. So the dealer positioning that shapes the S&P and Nasdaq is built in SPX/SPY and NDX/QQQ options, then felt in the futures. The Call Wall, Put Wall, and Gamma Flip are computed from the index options and mapped onto the ES or NQ price. Overnight, when the cash options market is closed, those levels are the structure the globex session leans on.
This is precisely what GEX Levels does: it computes the dealer map from the live index/ETF options chain, then converts every level onto the instrument you trade — SPY, QQQ, ES, or NQ — using a synchronized ratio so the two legs do not drift apart. It also lets you overlay an index set beside an ETF set, so you can see where the institutional and retail crowds agree, and where they don't.
Common mistakes
- Assuming SPX and SPY levels are identical. They are close but not the same — different crowds, different settlement, walls a few points apart.
- Using a stale conversion ratio between the option level and the futures price, so a good level lands in the wrong place.
- Thinking futures have no dealer structure. They inherit the entire index-options structure — they just don't host it.
Why the walls disagree — and what that tells you
If SPX and SPY track the same index, their dealer levels ought to sit at the same place once you scale them. In practice they often sit a few points apart, and that gap is not an error — it is information about who is positioned where.
The reason is that the two products are held by different crowds. SPX options are dominated by institutions: portfolio hedges, large structured positions, systematic strategies, mostly further out in time and in size. SPY options carry an enormous retail and short-dated flow, with far more of the volume concentrated in same-day expiries. When those two populations position differently — say institutions hedging heavily below the market while retail buys calls above it — the resulting gamma profiles peak at different strikes.
Read together, that disagreement is genuinely useful. When the index and ETF walls agree, you have two independent crowds pointing at the same price, and the level is correspondingly stronger. When they disagree, you have a zone rather than a line, and price often works its way between the two before resolving. It is the difference between a single reading and a triangulation, which is exactly why the indicator lets you overlay an index set beside an ETF set rather than forcing you to choose.
The basis, and why conversion has to be synchronised
There is one technical trap in trading options-derived levels on futures, and it is worth understanding because it silently ruins otherwise good maps.
A future does not trade at exactly the same price as the index it tracks. The difference — the basis — reflects financing costs and dividends until expiry, and it drifts over time. So converting a level from index space to futures space is not a fixed multiplication; it depends on the relationship between the two at the moment you convert.
Suppose the dealer map puts the Call Wall at QQQ 505, and you want it on NQ. The conversion is essentially a ratio between the two instruments. If you take the QQQ price from a feed that updates every 90 seconds and the NQ price from one updating every 5 seconds, you are computing a ratio from two prices captured at different moments.
On a quiet tape, the error is trivial. On a fast one, the two legs can be meaningfully out of step, and the ratio inherits the whole discrepancy — placing your level tens of points away from where it belongs on NQ. The level was right; the translation was not.
The fix is to take both legs from the same moment — a synchronised ratio — rather than whatever each feed happened to have. It is an unglamorous engineering detail that decides whether a level lands on the price where reactions actually happen.
Choosing what to actually trade
All of this leaves a practical question: which instrument should you be on? There is no universal answer, but the trade-offs are clear.
- Futures (ES, NQ) — trade nearly around the clock, deep liquidity, tight spreads, and one instrument to learn. They inherit the entire index-options structure without hosting it. This is where a large share of active index traders end up.
- ETFs (SPY, QQQ) — accessible, tradable in small size, and you can trade their options directly. Regular hours only, and their options carry a very different crowd than the index.
- Index options (SPX, NDX) — cash settled, no assignment surprises, and where the institutional structure is actually built. Larger notional per contract.
Whatever you choose, the map is computed from where the options actually live and then translated onto your chart. That translation is the bridge this whole Academy is built on: the structure is created in one place and felt in another, and the trader who understands the link can read levels that the price chart alone could never reveal.
The complex moves as one
A useful mental shift: stop thinking of SPX, SPY and ES as three tickers and start thinking of them as three windows onto one thing. Arbitrage keeps them locked together — any meaningful divergence is closed almost instantly by firms whose entire business is closing it.
The consequence is that information from any window applies to all of them. Options positioning built in SPX shapes what ES does overnight. Retail flow in SPY affects the index that SPX options are written on. A large trade in one propagates to the others within seconds.
This is liberating in practice: you are free to gather information wherever it is best and execute wherever execution is best. The options data lives in the index and ETF chains; the cleanest, longest-hours, lowest-cost execution is usually the future. Using both is not mixing markets — it is using two views of the same market for the thing each does well.
What each instrument does through the day
The family has a daily rhythm, and knowing it tells you which window is informative at which hour.
Overnight, only the futures trade meaningfully. The options market is closed, so the dealer map is frozen — the levels from the prior session are the structure the globex tape leans on, with no new hedging flow being created. This is why overnight moves can travel a long way through levels that would have held during the day.
At the cash open, everything reconnects. The options market reopens, dealers resume active hedging, and the map becomes live again. This is frequently why the first thirty minutes behave so differently from the overnight session that preceded them — it is not just volume, it is the hedging engine restarting.
Through the session, options flow continuously rewrites the map. Same-day expiries decay, new positions open, the profile shifts under you.
Into the close, charm effects intensify and expiring positions resolve. Then the options market closes, the map freezes again, and the cycle repeats.
Knowing which phase you are in tells you how much to trust the levels in front of you — a frozen overnight map and a live midday map are different objects.
A Put Wall computed at the prior close sits at ES 5,000.
At 3am, price reaches it. The options market is closed; no dealer is actively hedging new flow. The level is a reference the overnight crowd watches, but the mechanical support behind it is dormant. Breaks here are common and often reverse at the open.
At 10am, price reaches the same level. Dealers are actively hedging, gamma is live, and the mechanical support is real. This is the level doing its actual job.
At 3:50pm on expiry day, price reaches it again — but most of the gamma that built it expires in ten minutes. The level is about to stop existing.
One price, three completely different levels, depending only on what the options market is doing at that hour.
Index (SPX/NDX), ETF (SPY/QQQ ≈ 1/10), and future (ES/NQ) are three forms of the same market with different crowds. Options live in the index and ETF; the futures inherit the positioning. GEX Levels computes the dealer map from the options and maps it onto whatever instrument you trade.
- SPX/NDX = institutional cash-settled index options; SPY/QQQ = retail ETF options at ~1/10 scale; ES/NQ = the futures that inherit the structure.
- They track together but their walls can differ by a few points — that gap is a signal in itself.
- Futures traders read options-derived levels because their instrument has no meaningful options of its own.
- Accurate conversion (a synchronized ratio) is what keeps the level in the right place.
Put an ES or NQ futures chart next to the matching index (SPX or NDX). Watch them move in lockstep through a session. Then note the small, steady offset between them — the basis. That offset is exactly what a good conversion has to account for.