(function(){
var COOKIE_NAME = 'menthorq_utm_params';
var LS_KEY = 'menthorq_utm_params';
var UTM_KEYS = ['utm_source','utm_medium','utm_campaign','utm_term','utm_content','utm_id'];
var CLICK_ID_KEYS = ['gclid','fbclid','msclkid','ttclid'];
var COOKIE_DAYS = 30;// Read UTM parameters and click IDs from current URL
var params = new URLSearchParams(window.location.search);
var trackingData = {};
var hasData = false;
var allKeys = UTM_KEYS.concat(CLICK_ID_KEYS);
for (var i = 0; i < allKeys.length; i++) {
var val = params.get(allKeys[i]);
if (val) {
trackingData[allKeys[i]] = val;
hasData = true;
}
}if (hasData) {
// Fresh tracking data found in URL — store it (overwrites previous attribution)
trackingData.captured_at = new Date().toISOString();
setCookie(COOKIE_NAME, JSON.stringify(trackingData), COOKIE_DAYS);
try { localStorage.setItem(LS_KEY, JSON.stringify(trackingData)); } catch(e) {}
return;
}// No tracking params in URL — check if cookie exists
if (getCookie(COOKIE_NAME)) return;// Cookie is missing (expired or first visit) — try to restore from localStorage
try {
var stored = localStorage.getItem(LS_KEY);
if (stored) {
var parsed = JSON.parse(stored);
if (parsed && (parsed.utm_source || parsed.gclid || parsed.fbclid || parsed.msclkid || parsed.ttclid)) {
setCookie(COOKIE_NAME, stored, COOKIE_DAYS);
}
}
} catch(e) {}// Helper: set cookie
function setCookie(name, value, days) {
var expires = new Date(Date.now() + days * 864e5).toUTCString();
var cookie = name + '=' + encodeURIComponent(value) + ';expires=' + expires + ';path=/;SameSite=Lax';
if (location.protocol === 'https:') cookie += ';Secure';
document.cookie = cookie;
}// Helper: get cookie value (returns empty string if not found)
function getCookie(name) {
var match = document.cookie.match(new RegExp('(?:^|; )' + name + '=([^;]*)'));
return match ? decodeURIComponent(match[1]) : '';
}
})();
var breeze_prefetch = {"local_url":"https://menthorq.com","ignore_remote_prefetch":"1","ignore_list":["/wp-json/openid-connect/userinfo","wp-admin","wp-login.php"]};
//# sourceURL=breeze-prefetch-js-extra
While every stock and ETF has its own options expiration cycle, SPX (S&P 500 Index) and VIX (Volatility Index) expirations tend to command the most attention. These instruments represent major hedging vehicles and reflect institutional positioning.
For example, using a platform like MenthorQ, traders can locate SPX’s current monthly expiration and assess how much gamma and delta exposure is tied to that specific date. If, say, 27% of the total gamma for SPX options is set to expire on that day, that tells you something significant: once those options roll off, the need for dealer hedging related to that gamma disappears—provided those options expire out-of-the-money.
This creates a mechanical unwind of dealer exposure, which may release directional pressure from the market.
Option Matrix: Opex Guide 5
Gamma and the “Pinning” Effect
Why does Opex often feel “sticky” near certain levels?
It’s because of gamma pinning. Leading into expiration, when a large amount of open interest sits at specific strikes, dealers who are hedging their gamma exposure often push and hold prices around those levels. This happens because their hedging activity—buying when the market dips, selling when it rises—tends to contain movement.
As a result, the underlying index or stock gets “pinned” to the strike with the most gamma exposure. This dynamic becomes especially visible in SPX during major quarterly expirations, where sometimes 50% or more of the total gamma can be set to expire in a single session.
What Happens After Opex: The Technical Drift
Once Opex concludes, a notable shift often occurs. With the expiration of massive amounts of open interest, particularly if they were concentrated in specific strikes, the market is no longer “trapped” by the hedging flows that created the pin.
This allows technical price movements to emerge more freely. Historical post-Opex charts often show new price trends taking shape in the days that follow, as the unwind of hedges and rollovers creates room for fresh directional plays. Many traders refer to this as the “Opex drift.”
This behavior is not anecdotal—it’s repeatable and visible across multiple expirations when monitored through the lens of delta and gamma distributions.
Learning Through Observation
For those still getting familiar with these concepts, the best teacher is observation. When an Opex is approaching:
Monitor the options matrix for your asset.
Note how much gamma and delta is expiring.
Observe where the largest open interest sits.
Watch how price behaves as it nears those levels.
Then, repeat this process post-expiry. Does the market break away from the pinned strikes? Do you see an increase in volatility or directional conviction?
By doing this across a few Opex cycles, you’ll start to see clear behavioral patterns.
Final Thoughts: Using the Matrix to See the Invisible
The options matrix is not just a wall of numbers—it’s a market map that reveals where pressure builds and where it might be released. By understanding the dynamics of Opex, especially through the lens of gamma exposure and strike distribution, traders can gain early insight into when the market might stall, break, or trend.
Whether you’re a seasoned options trader or a beginner building your knowledge, each Opex offers a live case study in how positioning influences price. With time and attention, the once-invisible forces behind the tape start to become clear.
Join us today
Access daily Market Research and our interactive Dashboard. Make better trading decisions.
