VolSignals Profile picture
Jul 18, 2025 13 tweets 5 min read Read on X
Welcome to OPEX

Should you trust the rally?

Let's take a look

(1/n) Image
First, why was yesterday so boring compared to Wednesday?

Well putting aside VIX expiration- we had less headline noise (market already digested Trump's Powell noise)

and we also had a far more supportive (and sticky) profile around 6300

If these look mechanical- they are. Image
Image
In last night's Mentorship call we discussed the most likely pin for this morning.

Every reasonable interpretation of the dealer position suggested 6300 AM settlement.

(Sorry if you were looking for 6382 this morning 👀)

Why?

Take a look at the AM SPX July position: Image
I know you may be used to seeing much bigger numbers... like the BBG OPX Screen below—

(If you don't know why this OI doesn't matter- you need to listen to this morning's meeting) Image
What's happened so far overnight?

The index failed to clear an important cluster of dealer short options, and has reverted right back to its only balancing point in range: $6300 Image
AM rolls off at 9:30 AM and has not been traded since yesterday's close.

Does it matter for today's price action?

Answer:
"in a way, yes"

This is the PM-expiring positioning today- aka "ODTE"

These options are subject to change, but note the massive clusters of dealer longs Image
There's no generative magnetism from a strike that has 5 Delta.

That giant bar up top at $6350?

Not relevant down here at $6300.

If we squeezed above 6325 overnight...
TOTALLY different story.

and how about that inventory on the bottom right?
which date is that from? Image
did you guess Feb 21 2025?
That date also happened to be a PM expiration.

Similar price action (near ATH)
Similar VIX action that week
Similar 0DTE positioning

How did that day work out? Image
Nevermind. Let's move on.

Back to the day ahead...

Sweeping positive speed profile but no sharp features in the inventory to provide CLEAR "tests" to the downside.

Gamma is neutral to negative through a wide range here

...unbecoming of a $23 straddle Image
And with no clear standout positions to the downside, we don't ever find STRONG support from the decay flow that would encourage holding $6300

If we lose that level after the settlement, it's going to get hard to stay buoyant quickly to the downside Image
Takeaways?

We'll cover in this morning's meeting.

Listen to today's call LIVE at 9:05 AM
volsignals.com/vspro

Join the Mentorship
for apprenticeship + domain expertise
volsignals.com/vip-mentorship

Trial RTM for live institutional quality signals
volsignals.com/rtm Image
and of course, slides posted daily in the free server

discord.gg/volsignals

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More from @VolSignals

Feb 6
"We think a stronger gamma supply from the 0DTE complex has driven the long gamma overhang (lower intraday volatility, all else equal)" - UBS

Bingo – not all gamma is created equal Image
Longer tenor options literally have different gamma profiles.

Their gamma distributes farther across spot ranges and has less local variation (speed)
This creates stable gamma "regimes" at the back of the gamma profile.

Remember the regimes?
Read 13 tweets
Feb 6
When you know (accurately) what market makers are holding in the SPX

...you get more insight than you realize.

Years in, I'm still fascinated by what I'm learning every day as I drill into the details each morning and rate the outcomes.

Take positions, for example > Image
Across the 6800s for Friday's expiry-
market makers are net long 5,874 options

in the 6700s
market makers are net short 190 options

in the 6600s
...market makers are net long 15,952 options

Without being a quant, can you guess which range tomorrow would bring highest RV?
That option distribution is critical
it defines how the market will behave

note, I didn't say "could"
I didn't say "maybe" or "tends to"

it defines how the market will behave
Read 17 tweets
Feb 3
Vol Control funds currently 'very long' the S&P

these funds scale their exposure according to estimates of volatility, which are usually based on blended measures of historical volatility.

Their flows are impactful, but can't be modeled as precisely as option hedging

(1/N) Image
The simple way to understand their behavior -

When the market is calm, they'll buy more equities.
When it's volatile, they'll sell equities & reduce their beta
This isn't "exactly" gamma...

but it's yet another "rules-based" flow that's downstream of volatility, which is highly correlated with option gamma hedging flows.

This connection is likely the root of why market participants believe that "positive gamma is bullish."
Read 10 tweets
Feb 1
Gamma is a simple concept that starts with knowing that market makers want to make money trading options (not gamble on market direction)

So *delta* is the greek that tells us how much money we make or lose

when the market moves...
(1/n)
If our delta is 100 and the SPX goes up $1, we make 100
if it goes down $1 we lose 100

but options are more complicated because that "delta" changes, too.
Gamma measures how much that changes

If our delta starts out neutral (0 market exposure)...

the market goes up $1

and suddenly our delta is +200

our gamma must be +200 (delta change / spot change)
Read 12 tweets
Feb 1
SPX DEALER GAMMA
[How to understand it and use it in your trading]

Last week, average dealer gamma was +$7.9bn, according to Bank of America

Let's break down what this means, bring the number down to earth- and explore how to use it in your own trading approach >> Image
First, that figure is Notional Gamma

it represents the dollar change in the option portfolio's delta given a 1% move in the index, expressed in notional terms.

A "delta" figure in this context is a way to understand your position's exposure to the underlying >>
Saying that your delta is $7.9bn

is like saying

"I expect the value of my options portfolio to behave as if I owned $7.9bn worth of stock" >>
Read 22 tweets
Jan 21
Long gamma or short gamma?

Most of the time, the market is in a "long gamma" position

Technically, this means that flows are absorbed by the hedging behavior of market makers- stabilizing the market overall and compressing ranges over time.
But compare today to yesterday?

If you're zoned in, this probably "feels" like negative gamma
but guess what...

it's still significantly positive overall.

It's just a major RELATIVE change in regime, comparing yesterday's totals to today's totals.

How do we quantify it?
Read 5 tweets

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