Bitcoin has experienced more extreme daily price fluctuations in 2026 than during the 2018 bear market, despite a significant decline in its overall volatility. CoinDesk’s analysis identified 10 days this year when Bitcoin’s price moved unusually sharply, highlighting concerns that conventional risk models may not fully reflect the cryptocurrency’s exposure to sudden market shocks.

According to the analysis, Bitcoin recorded 10 days in 2026 when its price movement reached at least three standard deviations from its recent trading pattern. This exceeds the eight comparable days recorded throughout 2018, when Bitcoin lost 73% of its value.

Traders use a statistical measure called “sigma” to determine how far an asset’s price movement strays from its typical behavior. CoinDesk compared Bitcoin’s daily price changes with its 30-day realized volatility, which measures daily price fluctuations over the previous month. Any movement that was at least three times that volatility level, either upward or downward, qualified as a three-sigma event.

Under a normal bell-shaped distribution, approximately 95% of movements fall within two standard deviations, while around 99.7% remain within three. Consequently, movements beyond three standard deviations are considered rare and can signal significant market disruptions. A higher frequency of such events suggests that an asset remains vulnerable to sudden price shocks even as its overall volatility decreases.

The findings show that Bitcoin’s typical price movements have become more subdued, but unusually large swings continue to occur. These events have been more frequent in 2026 than during the 2018 bear market, even though their average size has declined.

Bitcoin’s annualized volatility stands at approximately 46% this year, compared with 84% in 2018. Its average three-sigma price movements have also fallen to roughly 7%, down from around 10% eight years ago.

Nicolas Quatravaux, head of EMEA at Paradigm, an institutional liquidity network specializing in crypto derivatives, said Bitcoin continues to alternate between extended periods of calm trading and sudden price repricing. He attributed the lower average volatility to the growth of institutional participation, exchange-traded funds and deeper market liquidity. However, macroeconomic shocks, leverage and trader positioning continue to generate sharp movements.

Bitcoin’s volatility pattern also stands out when compared with other major assets. Since 2024, its volatility has been broadly similar to Nvidia’s, at approximately 47%. However, Bitcoin has recorded 26 three-sigma events during that period, compared with eight for Nvidia. The S&P 500 has registered 16, while gold has recorded 12.

Declining volatility creates challenges for risk management

The continued occurrence of extreme price swings presents difficulties for investors who rely on volatility-based models to determine how much Bitcoin to hold.

One commonly used metric is value-at-risk (VaR), which estimates the potential amount a portfolio could lose over a specified period. Some VaR models depend heavily on recent price movements, meaning an extended period of relatively calm trading can make an asset appear less risky.

As Bitcoin’s 30-day, 90-day and 180-day volatility readings decline, these models could encourage investors to increase their exposure. However, depending on how the calculations are structured, they may not adequately account for the possibility of unusually severe losses.

VaR also establishes a potential loss threshold without estimating how much losses could exceed that level. This limitation is known as tail risk, referring to the possibility of rare but exceptionally large losses beyond an asset’s normal trading range. Bitcoin’s repeated three-sigma events illustrate why investors need to account for these extreme scenarios even when day-to-day volatility is falling.

Luuk Strijers, CEO of crypto options exchange Deribit, said standard VaR measures do not fully capture tail risk. He noted that the industry has increasingly adopted Expected Shortfall and similar methods to address this limitation.

Expected shortfall estimates the average loss across the worst market outcomes. Unlike VaR alone, it helps investors evaluate the potential severity of losses during extreme events.

Macroeconomic shocks and derivatives positioning fuel volatility

Market participants attribute Bitcoin’s recurring sharp movements to a combination of unpredictable macroeconomic developments and heavily leveraged options positioning.

Quatravaux said the events of 2026 demonstrate how these factors can interact. The year began slowly as investors shifted capital toward technology stocks, while a series of decentralized finance hacks encouraged traders to sell volatility and pursue returns through structured products.

Developments involving U.S. President Donald Trump, the Iran war and Federal Reserve policy subsequently introduced additional uncertainty. With many traders positioned for Bitcoin to remain within a narrow range, a single major headline could trigger an outsized market reaction, he said.

Risk can accumulate when traders expect prices to remain stable. Some sell options to collect premiums, taking on exposure to potential price swings in exchange for the income. These strategies can perform well during quiet periods, but unexpected news can force options sellers to reduce their positions quickly, intensifying the original market movement.

Alexander S. Blume, co-founder and CEO of Two Prime, an SEC-registered investment adviser, identified call overwriting as another popular strategy. Investors sell call options against Bitcoin they already own, earning premiums while giving up some potential gains if prices rise significantly.

Blume said the expansion of derivatives positioning has allowed substantial price movements to remain relatively common despite lower overall volatility. He described call overwriting as a crowded trade and warned that sharp upward moves can trigger short squeezes, amplifying gains as traders adjust their exposure.

Bitcoin’s market is more resilient, but shocks persist

Bitcoin’s market infrastructure appears better prepared to handle sudden price movements than it was several years ago.

On Sept. 21, the day Bitcoin experienced its latest three-sigma jump, Paradigm facilitated a record $6.7 billion in options trading.

Quatravaux said there were no reports of trading desks suffering significant losses during the episode. He credited improved risk management, more sophisticated market participants and increased institutional involvement with helping the market absorb volatility.

These developments suggest that the market can withstand periods of turbulence more effectively, reducing the likelihood that a difficult trading month will escalate into a broader crisis.

Nevertheless, extreme price movements are unlikely to disappear. Quatravaux said a decade of data shows that unusually large trading days have continued despite the market’s maturation. As macroeconomic shocks remain unavoidable, Bitcoin could continue experiencing sudden repricing even if its overall volatility declines further.