SPX Gamma Desk
DAVID ARIAS
Order flowGamma bookStrategy

SPX dealer gamma · order flow and execution

LIVE · SPX GEX · SIMULATED TAPE
Mode
Market
Refresh
SPX spot
Net gamma
bn $ per 1%
Regime
Position
P&L, mark to market
Realised
Level 1Tape
BID ASK SPR 0.25
TimePriceSize
Level 3Depth by strike
Strike Call OIGammaIVCall GEX Put OIGammaIVPut GEX Net
open interest fixed at today's OCC settle · gamma re-priced from Black-Scholes at each tick
Net gamma across spot
the book re-priced at every hypothetical spot across ±15% · blue is dealers long gamma, damping moves · red is dealers short gamma, amplifying them · the dashed grey line is where the curve stood at the open, before the day's theta
What moves the book
Dealer book long calls, short puts
every number on the page re-prices from today's chain as you move these, in both modes · implied volatility, same-day open interest and the dealer sign can be changed while the tape runs · spot and the clock are yours only in sensitivity mode · same-day open interest stands in for the 0DTE flow that never reaches the OCC · inverting the book asks what the picture looks like if the dealer sign assumption is wrong
Gamma resting at each strikebn $ per 1%
each strike's net contribution, re-priced at the spot of the moment · the tallest bars are the walls
Gamma by days to expirybn $ per 1%
the published book by expiry, moved every tick by how the strikes within 2.5% of spot have re-priced · near-dated contracts carry the negative gamma
Equity, realised and open
Round trips
0
no trades yet
Realised$0
Open$0
Best traden/a
Worst traden/a
Drawdown$0
realised money plus the open position, marked every tick · dots mark exits · shading is the distance below the running peak
What moves with whatlast two hours
Pearson correlation over the last 120 one-minute observations, re-computed every tick · green moves with, red moves against · return and P&L are changes per minute, the rest are levels
Spot minus flip, in daily sigma
shaded band is the break zone, where nothing is traded · dashed lines are the fade levels · the line takes the colour of the regime
Realised against implied volatility
30 minute realised volatility of the tape, annualised, against today's at-the-money implied · the shaded excess is what a short gamma book pays for
Round trip results0 closed
dollars per closed trade, oldest on the left · dashed line is the mean