1. Quick Refresher on Charm and Vanna

Charm (Delta Decay)

Charm reflects how an option’s delta changes strictly due to the passage of time, assuming the underlying’s price stands still. If you’re short an out-of-the-money put, your net position has positive delta because the put buyer’s delta is negative, and the seller takes the opposite side. As time goes by without the underlying price dropping, that OTM put’s probability of expiring in the money decreases—its delta shrinks.

Dealers who initially shorted the underlying to hedge the short-put delta can then buy back some of their short position. This process is often called the “charm bid,” and it can act as a low-key but consistent tailwind for the market.

Vanna

Vanna measures how an option’s delta evolves in response to changes in implied volatility. For a short put position, if implied volatility rises, the put’s delta can climb, pushing dealers who are short that put to sell more of the underlying to remain delta-neutral. Conversely, if implied vol declines, those put deltas shrink, prompting dealers to buy back some of the underlying. This “vanna flow” can exacerbate or moderate price trends depending on whether volatility is expanding or contracting at key moments.

2. OTM vs. ITM Puts and Dealer Flows

OTM Puts: Typically a Positive Charm Effect

When the market (spot) is trading above the strike prices of most puts, those puts remain out of the money. Each day without a notable selloff reduces the likelihood of those puts finishing in the money, causing their deltas to drop. As put deltas decrease, dealers who sold them can unwind part of their short hedge in the underlying, effectively buying back shares or futures. This “charm bid” can offer gentle upward pressure on the market—even in the absence of strong fundamental drivers—because a steady stream of dealers is nibbling at the underlying to adjust their hedge.

ITM Puts: Can Become a Negative (or Diminished) Charm Effect

If the market drops below a large strike area, those puts shift in the money. Their deltas rise substantially (e.g., from 0.20 or 0.30 to 0.60 or 0.70). As expiration nears and the market stays beneath those strikes, these ITM puts might edge closer to a delta of 1.00, reflecting a high probability of expiring in the money. From a dealer’s perspective, that means more shorting of the underlying is required to stay neutral, particularly if the put’s delta continues to creep upward over time. This scenario can negate the usual supportive charm effect. Instead of seeing net buying from dealers, the market may experience persistent selling or, at best, a diminished “charm bid.”

3. Why the VIX Might Appear “Heavy” or Sustain Elevated Levels

VIX as a Fear/Volatility Gauge

The VIX measures the market’s expectation of volatility for the S&P 500. When traders expect turmoil or remain fearful, the VIX can surge and remain high. Conversely, if the catalysts for fear (e.g., rate decisions, geopolitics, economic data) dissipate and no new shocks arise, implied vol often leaks lower.

Heaviness vs. Persistent Elevation

In the short term, if no fresh downside catalysts appear, many traders unwind their hedges. Implied volatility tends to sink when that protection is no longer deemed necessary, making the VIX feel “heavy.” Yet the VIX can stay elevated if there is ongoing uncertainty (like multiple looming economic data releases or significant central bank moves) or if many puts remain ITM. In such cases, dealers may keep implied vol marks high because the market remains on edge, fearing further slides.

The Positive Squeeze Scenario

The term “vanna/charm squeeze” describes a situation where shrinking put deltas (due to time decay) and falling implied volatility together prompt dealers to buy back their short hedges. This combination can spur a slow grind higher or even a quick intraday rally if enough OTM puts bleed out in value.

This scenario is common in quiet markets where participants load up on protective puts, but no negative events materialize. Over a series of trading sessions, the put deltas roll down, dealers buy back short positions, and prices can drift up more easily than many anticipate.

ITM Puts and a Balanced Setup

In contrast, if a large chunk of puts sits ITM and remains that way, the usual positive “charm flow” is diluted. As those puts keep a high delta and the probability of finishing in the money remains elevated, dealers stay net short the underlying. They must maintain or even increase their short hedge if the spot drifts lower, leaving less room for a systematic gamma- or charm-driven bounce. This arrangement can lead to a market that’s more prone to downward pressure, or at least lacking the typical floor provided by positive charm flows.

Expiration Catalysts (OPEX) and VIX Expiry

Each monthly or quarterly option expiration—along with the VIX expiry—resets the board. Traders close or roll positions, removing the negative gamma or heavy put open interest that may have been stifling a potential rebound. If, after expiration, those puts are no longer reinitiated at similar strikes, dealers are free to buy back their short hedges in the underlying. That can allow for a post-expiration rally (assuming no sudden macro or geopolitical threats emerge at the same time).

5. Putting It All Together

VIX “Heaviness” vs. Quick Fade

The VIX can remain up if uncertainty lingers, but often feels heavy without new catalysts to spark demand for puts. Once short-dated hedges near expiration or are closed, implied vol tends to drift lower unless market participants see plausible reasons for another leg down.

Charm Effect Depends on Put Positioning

Short OTM puts that stay OTM can produce a constant bid for the market (charm). However, if many puts go ITM and stay there, dealers keep short exposure in the underlying to hedge rising put deltas. In that scenario, the typical squeeze or support from charm is absent—or even reversed.

After VIX Expiry and OPEX

When large put positions expire or roll off, the market can lose a major source of negative gamma or ongoing dealer short hedging. This can unleash more directional freedom, often seen as relief rallies if the macro backdrop leans supportive or at least neutral.

No Guaranteed Rally, But Less Hedging Pressure

Removing big put positions doesn’t automatically ensure an upside surge—it simply relieves some mechanical selling pressure. If new puts are quickly established at new strikes, the cycle repeats. Ultimately, the interplay of fundamentals, sentiment, and any lurking catalysts determines whether the market capitalizes on that reduced hedging demand.

Conclusion

Charm and vanna may not dominate headlines like delta or theta, but they shape significant flows in modern markets—especially regarding how dealers adjust their positions. Whether the VIX remains elevated or compresses often depends on where puts reside (OTM vs. ITM) and whether dealers are unwinding or adding short hedges. The classic vanna/charm squeeze can accelerate a rally if time decay steadily erodes OTM puts and implied vol recedes, while a cluster of ITM puts can mute or reverse that supportive effect.

For traders, understanding these second-order Greeks is key to predicting how spot prices and volatility may behave in the run-up to major expirations or during uncertain market periods. By keeping an eye on open interest distributions, monitoring whether large strikes are above or below the current market level, and noting how implied vol trends into expiry, one can more accurately gauge when the market might see a “charm bid” or, conversely, remain pinned by persistent negative flows.