Full Analysis of Bitcoin Options Expiration Effect: How the Gamma Peg Mechanism Suppresses Price Fluctuations

As each major Bitcoin options expiry approaches, market participants often observe an unusual phenomenon: price volatility seems to be "nailed down" by an invisible force. Whether breaking upward or downward, prices tend to repeatedly tug around key strike prices, making it difficult to establish sustained trends. This phenomenon is especially pronounced on the eve of May 29, 2026 — with approximately $6.25 billion worth of BTC options on Deribit set to settle, with open interest heavily concentrated near the $75k and $80k strike prices.

This is not merely a coincidental market psychology effect, but a structural outcome driven by the hedging mechanisms of options market makers. Gamma pinning essentially occurs during the management of delta-neutral exposure, where market makers repeatedly buy or sell spot or futures to hedge delta, thereby exerting a gravitational pull on prices. Understanding this mechanism is key to interpreting the market behavior around major options expiries.

On May 29, Options Expiry, with $6.25 Billion in Concentrated Open Interest

On May 29, 2026, Deribit will experience a large-scale Bitcoin options expiry. According to platform data, a total of 80,535 contracts will expire, with a notional value of about $6.25 billion. The open interest distribution shows a stark polarization:

Put options are most heavily concentrated at the $75,000 strike, with a notional size of approximately $394 million; call options are most concentrated at the $80,000 strike, with a notional size of about $532 million. Additionally, call options at the $82,000 strike have seen recent active trading, with around 1,600 contracts traded in the week, totaling roughly $126 million in notional, indicating some market participants are betting on a breakout before expiry.

Overall, the put/call open interest ratio is about 0.86, slightly favoring bullish sentiment. The maximum pain point — where option buyers stand to lose the most and sellers the most profit — is estimated near the $75,000 strike, below the current spot price.

At current levels, the confrontation between the $75,000 and $80,000 strikes, combined with the gamma pinning mechanism, is creating a structural constraint on short-term price movements.

The Operation of the Gamma Mechanism and the Accumulation of Expiry Effects

Gamma Risk Exposure of Options: The "Stabilizer" and "Amplifier" of Price Fluctuations

Gamma is a Greek letter measuring the rate of change of delta in options pricing. For market makers, gamma risk exposure determines the direction and magnitude of their hedging adjustments as prices move.

There are two fundamentally different gamma states in the market:

Long Gamma. When market makers are long gamma, falling prices trigger buy orders of BTC to hedge, while rising prices trigger sell orders. This inverse hedging logic naturally suppresses volatility, causing prices to tend to "bounce back" around key strike prices — this is the core mechanism of gamma pinning.

Short Gamma. When market makers are short gamma, falling prices force them to continue selling, while rising prices compel them to chase higher buys. This positive feedback amplifies price swings, creating gamma squeeze effects.

Glassnode analysis has pointed out that near the $75,000 level, there is a significant concentration of negative gamma, forming a magnetic structure that pulls prices toward this point.

The Evolution of Gamma in the First Half of 2026

Before the March quarterly expiry in 2026, a notable short gamma structure appears near $75,000. Data from Glassnode shows about $2.1 billion of negative gamma concentrated around this strike, with roughly $1.8 billion tied to the March expiry. Positions expiring on March 27 show about $2.56 billion of short gamma accumulated near $75,000, with market maker hedging behaviors creating a "gamma magnet" effect pulling prices toward this level.

In April, the market structure shifts further toward a defensive stance. Around $60,000 puts and $80,000 calls on Deribit have accumulated about $1.4 billion in notional open interest each, forming large-scale "fortifications" at both ends of the price range. This "heavy positioning at both ends" indicates that large players are simultaneously hedging against significant drops and rapid rises.

The Gamma Attraction Field Formed by the 75K / 80K Levels

Open Interest Concentration and Gamma Distribution

The concentrated distribution of open interest at expiry on May 29 is the direct entry point to understanding the gamma pinning effect.

| Strike Price | Open Interest Type | Notional Size | Inferred Gamma Direction | | --- | --- | --- | --- | | $75,000 | Put options | approx. $394 million | Negative gamma attraction zone | | $80,000 | Call options | approx. $532 million | Near the boundary of negative/long gamma | | $82,000 | Call options | approx. $126 million (recent increase) | Positive gamma accumulation |

The $75,000 strike is not only the largest concentration of puts but also the maximum pain point. The large volume of puts encourages market makers to adjust hedges as prices approach this level, generating a gamma attraction that pulls prices toward it.

The $80,000 strike has about $532 million in call open interest. The gamma structure here is more contentious — if market makers are in a negative gamma state above $80,000, a breakout could quickly turn into a gamma squeeze; if in a positive gamma state, a breakout might face selling pressure.

Historical Price Volatility Around Expiry

Historical analysis provides validation for the gamma pinning effect. Data shows that volatility tends to decline significantly before major BTC options expiries, then spikes afterward.

| Indicator | Data | | --- | --- | | Probability of volatility decline two weeks before expiry | about 73% | | Volatility drop before December 2023 expiry | approx. 41% | | Volatility drop before June 2025 expiry | approx. 39% | | Average rebound within 48 hours after expiry | about 28% |

These historical figures, covering major BTC options expiries from 2019 to early 2026, also show that after 2024 expiries, BTC often experiences sharp rises within 72 hours, while June 2024 expiry saw a notable correction, indicating that post-expiry price directions are highly dependent on the imbalance of long/short gamma.

This pattern aligns closely with the gamma pinning mechanism: before expiry, large open interest forces market makers to hedge actively, suppressing volatility; after settlement, the unwinding of hedges releases the accumulated volatility energy.

Market Sentiment and the Long-Short Battle Between Institutions and Retail

The Bearish Defensive Camp: "Smart Money" Preparing for Deep Pullbacks

In early April 2026, Deribit saw a surge in large put open interest, with total puts below $60,000 reaching about $1.44 billion — the highest across all strikes and maturities.

Major players behind this defensive positioning include Bitcoin ETF holders and treasury funds. They are buying 6-month and 1-year puts at $60,000 and below as a form of insurance against prices falling below that level.

The Bullish Aggressors: Betting on a Breakout at $82,000

In contrast, active trading in $82,000 calls has been observed. The expiry on May 29 has seen about 1,600 contracts traded at this strike, with a notional value of roughly $126 million.

The overall put/call ratio of 0.86 also leans slightly bullish.

Core Divergence

The most notable structural divergence in the current market is: institutions are systematically hedging with puts, while simultaneously betting on a short-term breakout with calls. This is not a logical contradiction but a reflection of multi-timeframe decision-making — long-term defense versus short-term speculation.

Scrutinizing the Narrative: Is the "Pinning Effect" Price Manipulation?

Testing the "Pinning Effect as Price Manipulation" Narrative

A common narrative suggests that the price "stands still" before major expiry because large players intentionally manipulate prices to favor certain strike levels. This requires careful analysis.

Market makers' gamma hedging is a risk management activity, not active price manipulation. Their goal is to maintain delta neutrality, adjusting hedges according to predefined algorithms regardless of price direction. When in a long gamma state, hedging naturally causes prices to rebound; in a short gamma state, it amplifies volatility. In either case, market makers' actions are reactive, not directional.

Gamma pinning is an inherent feature of options market mechanics, not external manipulation. Historically, there has been no evidence of sustained price "pinning" at specific strikes through manipulation, because if such manipulation existed, arbitrageurs would exploit it via offsetting trades, eroding any edge.

Historical Volatility Declines and Their Causes

Some analyses attribute the volatility drops before expiry to market risk aversion or liquidity droughts during holidays, but about 73% of the statistical evidence points to a systemic, not coincidental, phenomenon. The concentration of gamma around expiry forces large hedging adjustments, directly suppressing volatility.

Industry Impact and Strategic Implications

Implications for Trading Strategies

The gamma pinning effect impacts different market participants differently. Short-term traders face a "force field" created by gamma concentration: attempts to break through the $75,000–$80,000 range are more likely to fail. Hedgers, on the other hand, see the post-expiry reconfiguration of gamma as a signal to reassess risk exposure, as volatility may be released once hedging pressures unwind.

Significance for Market Structure and Maturity

The continuous growth of Bitcoin options market size is reshaping BTC’s price discovery process. Deribit’s total open interest reaching $31.3 billion, with concentrated open interest at key strikes, turns the gamma pinning effect from an occasional phenomenon into a cyclical regularity. Crypto derivatives are evolving from auxiliary tools into core drivers of price behavior.

Meanwhile, increased institutional participation introduces a dual effect — more mature capital provides liquidity and reduces daily volatility, but extreme gamma concentrations can amplify tail risks through hedging feedback loops.

Conclusion

The phenomenon of prices "standing still" before major BTC options expiry is not a mere psychological artifact but an inevitable result of the gamma hedging mechanism under highly concentrated open interest. The zone between $75,000 and $80,000 essentially forms a structural constraint in the price discovery process driven by derivatives markets.

Understanding this mechanism helps market participants distinguish between price movements driven by derivatives structures and those rooted in fundamentals. The former typically dissipate quickly after expiry, while the latter form the basis for longer-term trends. Before May 29, the gamma pinning effect will continue to dominate short-term price behavior; how volatility is released afterward remains a key market variable worth observing.