GEX Flow: How to Read the Intraday Options Flow
- GEX Flow shows the intraday evolution of net GEX with lookback dots marking major shifts.
- Options Flow (Trader plan) shows individual large trades: sweeps, blocks, unusual activity.
- Use GEX Flow to see if positioning is building or unwinding throughout the session.
- Sweeps (aggressive, multi-exchange) indicate institutional urgency; blocks are large single-exchange prints.
What is GEX Flow?
GEX Flow is the intraday time-series chart of net GEX. Unlike the GEX Profile chart (which shows GEX at each strike at the current moment), GEX Flow shows how total net GEX has changed over the course of the trading session.
It answers a specific question: is positioning getting more positive (dealers absorbing more) or more negative (dealers getting shorter gamma) as the day progresses? That trend is often more actionable than the current snapshot alone — a market that's been slowly losing Long Gamma support throughout the session is telling you something that the current GEX level alone doesn't convey.
GEX Flow is the bridge between the static structural picture and the dynamic intraday reality of positioning change.
Reading the GEX Flow Chart
The main line: Net GEX over time. Green indicates positive GEX (Long Gamma territory), red indicates negative GEX (Short Gamma territory). The line is plotted at the same interval as the snapshot cadence — you can watch it update in near-real time during the session.
Lookback dots: Markers placed at significant GEX shifts — large sudden increases or decreases in net GEX — within a short time window. These are moments of heavy options activity: large positioning changes that moved the needle on the overall GEX structure. A lookback dot at 10:30 AM means something significant happened at 10:30 AM in the options market for this ticker.
The zero line: When the flow line crosses zero, a regime transition has occurred. Watching how long the line spends below or above zero — and whether it crosses convincingly or bounces off — gives you a feel for how contested the current regime level is. A single brief dip below zero and recovery is very different from a sustained cross and trend lower.
Time axis: Regular trading hours 9:30 AM – 4:00 PM ET. The chart updates throughout the session, extending right as time progresses.
Options Flow Tape (Trader Plan)
The Options Flow tab shows individual large options trades in real time (15-minute delayed on the Developer data plan). Each row in the tape shows the key details of each significant print: Time | Ticker | Strike | Expiration | Side (Call/Put) | Size | Premium | Type (Sweep/Block) | Sentiment.
| Trade Type | Definition | Trading Significance |
|---|---|---|
| Sweep | Multi-exchange aggressive order, fills across multiple venues | High urgency — institutional is buying NOW, doesn't care about slippage |
| Block | Single large print on one exchange | Large position but may be hedge or spread leg — less directional signal on its own |
| Unusual | Size significantly above average OI at that strike | Something is being positioned here that wasn't before |
Reading the tape: A sweep of 5,000 calls at the $575 strike expiring Friday, when SPY is at $568, is a clear directional bet on a move to $575 by Friday. Multiple sweeps at the same strike over 30 minutes represents accumulation — not a one-off trade, but a building conviction position. This is the kind of activity that the GEX structure will eventually reflect as the open interest settles.
Combining Flow with GEX Structure
Flow aligned with walls: Large call sweeps at the Call Wall strike often signal a push to break through. Combined with the wall strength indicator, this is high-conviction — institutional money is betting that the structural ceiling is about to become a floor. When you see sweeps accumulating at the Call Wall, the probability of a wall break increases meaningfully.
Flow against walls: Large put buying when spot is near the Call Wall may signal institutions are betting on a rejection — they're positioning for the structural ceiling to hold. This adds weight to a fade trade. Sweeps in puts near the Call Wall when price approaches from below is the options market voting for rejection before price has even tested the level.
GEX Flow divergence: If GEX Flow is trending more negative (shorter dealer gamma) while price is rising, this is a warning sign — the structural support for the rally is weakening even as price grinds higher. Rallies on deteriorating GEX support tend to be more fragile and more susceptible to sharp reversals. Watch for this divergence particularly into the final hour of trading.
Understanding Lookback Dots
Lookback dots appear on the GEX Flow chart when the system detects a significant shift in net GEX within a short time window. They help you identify the exact moments when large options positioning occurred — before the price move that typically follows.
A lookback dot is not a trading signal on its own — it's an annotation saying "something significant happened here." Your job is to contextualize it: What direction was the shift? Was it a jump (bullish repositioning) or a drop (bearish)? Was it at a key level? Did it coincide with anything in the Options Flow tape?
High-value signals: When a lookback dot appears at or near a key GEX level (Call Wall, Zero Gamma), combined with a directional sweep in Options Flow, you have both structural and flow confirmation for a potential trade. The structural level + the institutional positioning signal + the lookback dot identifying the exact moment = a convergence that structural traders prioritize above most other signals.
Access live Options Flow and GEX tracking
Full GEX Flow chart, Options Flow tape with sweeps and blocks, and real-time regime tracking. Trader plan from $79/mo.
Frequently Asked Questions
Is the options flow data real-time?
Options Flow is 15-minute delayed on the Developer data plan. This covers the vast majority of GEXBoard's current tier. Real-time options flow would require the Advanced data plan ($199/mo from the provider) — not currently offered. For most structural analysis purposes, 15-minute delayed flow is sufficient to identify positioning trends, though scalpers may find the delay challenging for entry timing.
What is the minimum trade size shown in Options Flow?
Only trades above a minimum premium threshold are shown to filter out noise from small retail trades. The exact threshold is tuned to surface institutional-scale activity. Focus on the largest prints in the tape — they represent the most significant positioning changes and carry the most signal value for understanding where large capital is being deployed.
How is GEX Flow different from the GEX History tab?
GEX Flow is intraday — today's session, minute by minute, showing how net GEX evolved through the current trading day. GEX History shows the daily summary GEX for the past 5 trading days — useful for multi-day trend analysis (is GEX building or shrinking overall week over week?). They serve complementary purposes: GEX Flow for intraday context, GEX History for session-to-session positioning trends.