Home/Systematic Trading/Options Market Structure

Options Market Structure

options-market-structureLevel 2 — Intermediate

Unlocks

Alternative Risk PremiaConvexity StrategiesFlow-Driven StrategiesFlow TaxonomyLiquidity Cascade AwarenessMarket Making MechanicsVanna and Charm MechanicsVolatility Surface ReadingVolatility Trading

What It Is

Understanding how options dealers (market makers) hedge their books using the Greeks, and how those hedging flows create systematic, predictable pressure on underlying asset prices — from slow melt-ups during low-IV environments to violent feedback-loop sell-offs.

Correct Execution

Practitioner can read the current dealer positioning (long vs. short gamma/vanna) and forecast the likely direction of their hedging flows given a move in the underlying or a change in implied volatility. Uses this context to size positions appropriately and avoid being on the wrong side of mechanical hedging.

Progression Levels

Diagnostic Tree

Coaching Cues

  • "Know which side of the gamma your dealer is on." — before any options trade, determine if market makers are positive or negative GEX, Cem Karsan
  • "The put floor is not free insurance — it's the market's built-in destabilizer." — when VIX spikes create mechanical bottoms, not fundamentals
  • "Charm kills positions near expiration — size down going into op-ex." — when holding near-expiry positions approaching monthly/quarterly expiration

Common Errors

  1. Treating open interest as directional: Open interest only shows contracts outstanding, not whether they were bought or sold → cannot determine dealer position without bid/ask side analysis → use size > open interest as confirmation of new contracts being opened.
  2. Assuming all large trades are dealers: Institutional hedgers (e.g., JPMorgan selling large put tranches) create GEX as easily as dealers → the hedging flows from any large options position matter, not just dealer-initiated ones.
  3. Ignoring vanna when trading in trending low-IV markets: In a VIX declining environment, vanna is the dominant driver of equity flows, not fundamentals → ignoring it leads to being caught wrong-footed by the mechanical melt-up/melt-down.
  4. Shorting volatility during negative GEX: When dealers are in negative GEX (destabilizing), volatility can gap dramatically → shorting vol in this regime risks unlimited loss.

Edges

⚡ Conventional Wisdom Is Wrong

VIX At 40 Is The Signal To Sell Puts, Not Fear Them

options-market-structureoptions-market-structure →

When VIX spikes to extreme levels, retail and institutional investors increase put buying and remain short. The structural reality is that extreme put premiums eventually attract sellers who re-inject liquidity and generate the mechanical bottom. High VIX is not a danger signal for put sellers — it is maximum opportunity for them, because it marks the point where the feedback loop self-terminates.

What most people do
Reduce or eliminate short options exposure when VIX is elevated, treating high VIX as a signal to step back from selling volatility.
What the best do
Use extreme VIX levels as entry signals for put selling, understanding that the self-terminating mechanism (high premiums attract sellers) means the direction of the next move is strongly up from extreme vol.
Why it's an edge: Most traders' risk management rules cause them to exit exactly at the point of maximum expected value for vol selling.
How to exploit: Define a VIX threshold (e.g., 35+) above which short put sizing increases rather than decreases. Size based on the spread between IV and expected realized vol, which is at its widest at extremes.
Cem Karsan, "The Importance of Options Dealers," Systematic Investor podcast, 2022-12-13; "Dealer Hedging and Options Greeks Breakdowns," YouTube 2022-08-16
🔑 Hidden Causal Lever

The Slow Melt-Up Is Dealer Buying, Not Fundamental Demand

options-market-structureoptions-market-structure →

Extended periods of slow equity rally on declining VIX are not driven by fundamental buying — they are driven by the vanna feedback loop. As IV drops, dealers who sold calls must buy the underlying to re-hedge, which pushes price up and drops IV further. The rally has no fundamental driver; it is pure mechanical hedging flow.

What most people do
Attribute slow equity grinds to economic fundamentals, earnings estimates, or sentiment. Trade it as a fundamental rally.
What the best do
Identify the vanna driver by checking the VIX trend. A steady 10-20 day VIX decline with slow equity grind = vanna-driven. Position long but avoid adding short vega — the eventual reversal when the vanna flow exhausts will be violent.
Why it's an edge: Correctly identifying the driver tells you both when to ride it (vanna still running) and when to exit (IV compression complete), rather than waiting for a fundamental catalyst that will never come.
How to exploit: During VIX downtrends, maintain long equity exposure but systematically avoid short vega. When VIX flattens after an extended decline (vanna flow exhausting), reduce long exposure before the reversal.
"Dealer Hedging and Options Greeks Breakdowns," YouTube 2022-08-16
💎 Elite-Only Behavior

Don't Short Into A Vanna Unwind

options-market-structureoptions-market-structure →

During a negative GEX feedback sell-off, each down move forces dealers to sell more (to hedge their short put delta), which pushes vol higher, which forces more selling. Adding short deltas in this environment is competing against a dealer algorithm that must sell regardless of price. The correct move is to wait for the self-terminating signal — extreme put premiums attracting sellers — which generates a violent mechanical rally.

What most people do
See falling markets and accelerating decline as confirmation to add shorts. Mistake the speed of the decline as a signal to press.
What the best do
Recognize the vanna unwind signature (rapid multi-day sell-off, IV spiking, bid-ask on puts widening dramatically) and avoid adding shorts. Instead, watch for the self-terminating signal (extreme put IV) as a long entry point.
Why it's an edge: Prevents the common mistake of shorting into mechanical dealer-driven selling and simultaneously positions for the violent counter-move.
How to exploit: Define the vanna unwind checklist: (1) negative GEX, (2) VIX moving >2 points/day, (3) term structure backwardated, (4) put bid-ask spreads extremely wide. When 3+ criteria are met, exit any new shorts and prepare long entry for the termination signal.
"Dealer Hedging and Options Greeks Breakdowns," YouTube 2022-08-16; Cem Karsan, 2022-12-13
⚡ Conventional Wisdom Is Wrong

Quad Witching Volatility Is Housekeeping, Not Information

options-market-structureoptions-market-structure →

Quarterly expiration day ("quad witching") volatility is driven by charm-forced hedge unwinding across all strikes simultaneously, not by fundamental news or market sentiment. Trading it as a directional signal is trading noise — the moves are mechanical, predictable in aggregate, and uninformative about future direction.

What most people do
Interpret quad witching volatility as market sentiment or position for directional moves based on expiration-day price action.
What the best do
Recognize expiration volatility as mechanical hedging flows with zero directional information content. Either ignore it or exploit the predictable mechanics (pin risk, gamma scalping) rather than trying to extract a directional signal.
Why it's an edge: Most participants interpret mechanical noise as information, leading to false conviction. The practitioner who filters out expiration-day noise makes better decisions on the days that actually matter.
How to exploit: Flag all quarterly expiration dates. Exclude those days from any directional signal analysis. If you trade expiration, trade the mechanics (gamma exposure, pin risk) rather than the narrative.
From Diagnostic Tree, Symptom 4

Sources

  • "Dealer Hedging and Options Greeks Breakdowns," YouTube 2022-08-16 — comprehensive Greek mechanics, vanna/charm, GEX feedback loops
  • Cem Karsan, "The Importance of Options Dealers," Systematic Investor podcast, 2022-12-13 — dealer role in market liquidity, market structure
  • Cem Karsan, "Show Us Your Portfolio," Excess Returns podcast, 2023-04-13 — practical application of dealer flows to portfolio construction
  • Corey Hoffstein, "Liquidity Cascades," 2021-07-10 — options market as core driver of liquidity feedback loops
  • Cem Karsan, "The Market Voting Machine," Flirting with Models S4E1 (2021-05-03) — vanna and charm as dominant day-to-day market drivers, dispersion trading mechanics
  • Cem Karsan, "Correlation Breakdowns Lead to Very Profitable Dispersion," Ides of Macro Ep 5 (2023-07-06) — dispersion opportunity in low-correlation regimes, dealer positioning methodology