Spot Bitcoin ETFs Made It Easier to Short BTC

Bitcoin (BTC )  was launched in the aftermath of the 2008 global financial crisis in response to central bank bailouts, institutional censorship, and the instability of fiat currencies.

With its fixed supply and decentralized nature, Bitcoin gave the world a hard asset that isn’t driven by the whims of the central banks, governments, or major institutions. It actually allows users to be their own bank and to conduct borderless, permissionless transactions.

This store of value has come a long way from its humble beginnings, when it was a fringe asset. Today, Bitcoin is being firmly embedded in the traditional investment landscape through spot Bitcoin ETFs.

These products validated Bitcoin for mainstream users, especially institutions, and at the same time gave sophisticated traders the ability to bet not just on Bitcoin going up, but increasingly on it going down.

For years, betting against Bitcoin often required crypto-native infrastructure, offshore exchanges, derivatives expertise, or direct custody arrangements that many traditional institutions either couldn’t use or they just didn’t want to.

But that dynamic changed with the launch of U.S. spot Bitcoin ETFs, which gave hedge funds, pension funds, endowments, private equity, family offices, and sovereign wealth funds easier access to the trillion-dollar cryptocurrency.

A recent research took a deeper look at the behavior of seasoned professionals, suggesting that short sellers in spot Bitcoin ETFs may already be playing an important role in the market, particularly during periods of excessive investor optimism.

Bitcoin’s Volatility and Its Unusual Transparency

Crypto is notorious for its volatility, and even after all these years, Bitcoin remains one of the most volatile major financial assets in the world.

Despite reaching a market capitalization of $1.5 trillion, the asset continues to experience large price swings, rapid shifts in sentiment, and cyclical boom-and-bust behavior.

Throughout its history, Bitcoin has experienced multiple drawdowns exceeding 70% as well as rallies that produced some of the strongest long-term returns of any asset. It can even see fluctuations in a single week and even a day that are bigger than the moves made by many traditional assets in a year.

Bitcoin’s ability to easily shed a major chunk of its value in bear markets and then recover and set new all-time highs (ATHs) in bull markets is seen by some, especially traditional investors and risk managers, as a weakness.

But this is just one side of cryptocurrency. Bitcoin has other characteristics that are just as rare in traditional markets. Its hard cap supply is one. Then there’s the lack of central authority and trustlessness. Not to mention it is open, permissionless, borderless, and censorship-resistant.

Even more importantly, Bitcoin is unusually transparent. Every transaction that’s ever made on the Bitcoin network is permanently recorded on a public blockchain. So, anyone with an internet connection can see and verify the information.

This is unlike traditional markets, where institutional flows, insider activity, and fund positioning are kept mostly hidden, that is, until regulatory filings make them known weeks or months later.

On the blockchain, one can observe everything from transactions to supply issuance, wallet activity, and settlement data in near real time. For investors, this means the ability to monitor exchange flows, holder behavior, realized profits and losses, and derivatives positioning of market participants with a level of detail that’s hardly available elsewhere in finance.

As ARK Invest has noted, the open-source architecture allows market participants to analyze Bitcoin in more depth than is possible with virtually any other traditional asset.

It’s this transparency that helps study Bitcoin’s market cycles. By combining on-chain metrics such as the Market Value to Realized Value (MVRV) ratio, exchange outflow data, and wallet accumulation patterns with macroeconomic indicators and sentiment data, we can evaluate the asset’s market structure and understand investors’ psychology.

Source: ARK Investment Management LLC, Glassnode

With Bitcoin markets heavily influenced by adoption expectations, liquidity conditions, and investor psychology, in contrast to traditional assets, which are mainly valued through earnings, cash flows, or balance sheets, sentiment analysis becomes particularly important here.

In fact, cycles of extreme greed and fear appear more rapidly and visibly in crypto markets, which is also a key reason for Bitcoin’s volatility.

Now, an increase in institutional participation has made elements like liquidity, sentiment, and narratives, which interact transparently in the crypto market, more measurable and tradable.

The Decade-Long Fight to Bring Bitcoin Into Traditional Finance

Bitcoin started as an obscure digital experiment, a fringe asset existing outside the boundaries of traditional investment infrastructure.

For many years, the digital asset was traded on unregulated exchanges, held in hard-to-manage self-custodied wallets, largely adopted by cypherpunk communities, and primarily driven by retail speculation.

Up until recently, most mainstream institutions viewed Bitcoin skeptically, calling it a fraud and a bubble. Meanwhile, regulators have been concerned about market manipulation and investor protection.

But that changed as, year after year, Bitcoin not only maintained its relevance but also grew in value and adoption. The shifting view was also supported by the development of regulated futures markets, institutional custody providers, and corporate treasury adoption.

However, the approval of spot Bitcoin ETFs completely changed the landscape for the cryptocurrency, accelerating its integration into traditional finance. The road to this approval wasn’t an easy one, though. It took more than a decade to reach this stage.

Several applications were filed for a chance to launch a spot Bitcoin ETF in the US, but the Securities and Exchange Commission (SEC) kept on rejecting, that is, until Grayscale’s victory in court and the involvement of major TradFi institutions like BlackRock and Fieldity.

Finally, in January 2024, the SEC approved multiple spot Bitcoin ETFs, effectively legitimizing Bitcoin as an asset class.

With this move, Bitcoin was brought into the same brokerage accounts that people use to buy Nvidia stock, Treasury bonds, or ETFs, thus significantly lowering operational and compliance barriers.

The approval fundamentally changed how easily Bitcoin could be directly owned by those who were previously reluctant to allocate capital to the asset.

As institutions gained a familiar, regulated vehicle to invest in Bitcoin, the crypto asset saw swift, dramatic investment inflows, making spot Bitcoin ETFs among the most successful ETF launches ever.

Meanwhile, BlackRock’s iShares Bitcoin Trust (IBIT) emerged as one of the fastest-growing ETFs in history. In fact, in just 435 days, IBIT became BlackRock’s most profitable ETF by annual revenue.

In total, US Spot Bitcoin ETFs have collectively attracted over $57 billion in inflows so far and now hold close to $100 billion in total assets. These massive inflows helped Bitcoin’s price climb from about $40,000 at the time of ETF approval to a fresh high of just over $126,000 in early October 2026.

How ETFs Changed the Way Investors Trade Bitcoin

All the spot Bitcoin ETF buying led to a strong surge in the price of the leading cryptocurrency, a 215% increase over less than three years. But this journey wasn’t all uphill; it was filled with many deep corrections driven by institutional selling.

Recently, massive outflows from these vehicles caused the BTC price to decline to below $60,000 in early February this year. It is currently trading around $77,500, down 38.5% from the ATH.

The ability of institutional investors to express bearish views on Bitcoin through spot Bitcoin ETFs is one of the less-discussed consequences of these products.

Before ETFs were widely available, shorting Bitcoin wasn’t that easy, much like how longing for the asset wasn’t. In order to short Bitcoin directly, where one profits when an asset’s price falls, a trader has to work with the fragmented and complex crypto derivatives space or use offshore perpetual futures platforms.

This process is simplified by spot ETFs, which allow both retail and sophisticated investors to short Bitcoin through an easy, regulated infrastructure they already use across equities, commodities, and fixed income markets.

An important point to note here is that while short selling rewards a price drop, it also signals a mature market with a regulated infrastructure and high liquidity and efficiency.

Short sellers play a crucial role in making markets more efficient by identifying overvalued assets and sentiment-driven excesses and then correcting those mispricings. Study finds¹ that informed short sellers serve as liquidity providers, contributing to market stability.

The latest study on spot Bitcoin ETFs also found that short sellers “exploit Bitcoin sentiment overvaluation.”

It also noted that short sellers, widely recognized as informed traders in traditional markets, trade against overvalued assets, thereby pushing prices closer to their fundamentals.

In traditional assets, a good portion of short sellers’ profits comes from their superior ability to analyze publicly available information. Defined as contrarian traders who increase their positions after prices rise, short sellers also trade against excessively optimistic retail sentiment by first identifying assets heavily bought by retail investors and then shorting them.

Institutional investors can not only short but also hedge and arbitrage Bitcoin exposure using the same mechanisms they apply to other ETFs. Traders can exploit pricing discrepancies across markets, leverage ETF liquidity to manage risk more efficiently, and reduce directional exposure without exiting broader crypto strategies entirely.

Options on spot Bitcoin ETFs have further extended these capabilities, enabling sophisticated strategies like covered calls, protective puts, and volatility trades. Options on BlackRock’s IBIT began trading in November 2024, offering a new way to trade and speculate on Bitcoin’s price by allowing traders to buy or sell it at a predetermined price.

“A deeper onshore derivatives market will enhance the growing market sophistication. This will reinforce investor confidence in the asset, bringing in new cohorts while enabling a greater variety of investment and trading strategies,” which should “dampen both volatility and downside.”

– Economist Noelle Acheson said at the time

So, the introduction of spot ETFs created a regulated environment, and the growth of ETF-based short selling signals market maturity.

Betting Against Bitcoin through Spot Bitcoin ETFs

The new paper titled “Betting Against Bitcoin: Evidence from Spot Bitcoin ETFs²,” published in ScienceDirect this month, provided the first evidence of informed short selling in spot Bitcoin ETFs.

In equities, short sellers are well-documented contrarians who increase their positions after price run-ups, betting that recent gains are unsustainable, and profit by analyzing publicly available information more quickly and accurately than the broader market.

In this study, author Olena Onishchenko, Department of Accountancy and Finance, University of Otago, New Zealand, aims to answer whether short sellers in Bitcoin ETFs behave the same way as in traditional equity markets.

Using FINRA short-selling data for 11 U.S. spot Bitcoin ETFs between January 2024 and October 2025, the author examined short-seller behavior in Bitcoin ETFs and found both similarities and differences.

The study finds strong evidence that short sellers in spot Bitcoin ETFs are informed traders. It’s just that crypto valuations depend on expectations of adoption and investor sentiment. So, in crypto, informed trading refers to short sellers’ ability to identify and trade changes in market sentiment.

But does any of their behavior transfer to a completely different asset, which has no revenues, earnings, or dividends, and lacks clear fundamentals? The answer is a clear no.

The study finds no evidence that Bitcoin ETF short sellers increase their positions following price run-ups, as equity short sellers commonly do.

The reason for this, as per the author, is noise-trader risk theory. What it means is that retail cryptocurrency investors tend to extrapolate recent price increases as signals of broader market adoption, thereby creating persistent momentum rather than reversing it, which makes betting against price trends a potentially disastrous strategy.

Even if Bitcoin seems to be overvalued in the short term, strong retail-driven momentum can continue to push prices higher. Those who try to fade these rallies in Bitcoin’s price by being contrarian would face prolonged losses as momentum continues.

As a result, they don’t do this, at least not in the way equity short sellers do. What Bitcoin ETF short sellers actually do is, instead of responding to price action, they focus on sentiment extremes and turn to the Bitcoin Fear and Greed Index, a measure of investor sentiment in crypto that uses factors like price volatility, trading volume, and market momentum.

Specifically, Bitcoin ETF short sellers increase their short positions following index rises, i.e., when investor sentiment reaches extreme optimism. The study said:

“We find that short sellers in spot Bitcoin ETFs exploit Bitcoin sentiment overvaluation. They consistently increase their short positions following an increase in the Bitcoin Fear and Greed sentiment index.”

A 10% increase in Bitcoin sentiment over the prior five days is associated with a roughly 0.08% increase in next-day short selling. So, sophisticated traders use these periods of extreme market optimism as signals that Bitcoin may be temporarily overvalued and then take the other side.

This works, but only for a while, about five days, as the study finds the strategy of taking short positions when Bitcoin sentiment reaches extreme “Greed” earns a five-day risk-adjusted return of about 0.24%, or about 12.1% annualized.

After about five trading days, the effect dissipates, consistent with the idea that, as informed traders, Bitcoin ETF short sellers exploit real but short-lived, sentiment-driven mispricing. The brevity of the effect is likely due to the sentiment reversal, according to the study.

This predictive power of short selling has been found to hold after controlling for a wide range of ETF features, including volatility, liquidity, turnover, market capitalization, past returns, flows, and economic policy uncertainty, suggesting the effect is genuine and not attributable to other factors.

In addition to identifying shorting flows that predict negative ETF returns for up to five trading days, the study documents an important structural fact about the current Bitcoin ETF market: despite the growing involvement of institutions, ETFs are still mostly owned by retail investors.

The study reported institutional ownership across eleven ETFs to be between 4% and 31% as of Q3 2025. This dominance of retail investors, who are driven by sentiments, creates the very conditions the short sellers are exploiting through ETFs. The retail-dominated ownership of regulated Bitcoin products also provided an ideal setting to study short-seller trading behavior in cryptocurrencies, the study noted.

Overall, the study findings suggest that the informational role of short sellers in cryptocurrency markets is meaningfully different from that in traditional asset classes. While equity short sellers gain their edge mainly from fundamental analysis and contrarian positioning, Bitcoin ETF short sellers get theirs from the ability to read and time shifts in investor sentiment.

In a market where there are no earnings reports to analyze or balance sheets to look through, rather sentiment largely is the fundamental, this kind of informed trading makes sense.

Also, this may mean that crypto markets are developing their own distinct form of informational efficiency. So, while Bitcoin is increasingly integrated into institutional finance, it still retains behavioral characteristics that differ meaningfully from those of traditional assets.

According to Onishchenko, this study has implications for investors and hedge funds that are considering short-selling Bitcoin, but noted the small sample size as a limitation. “Our results should be interpreted as early evidence on short selling in the cryptocurrency market,” it concludes.

Conclusion

The massive appreciation in Bitcoin’s price is one of the main appealing points of the largest cryptocurrency; there’s no doubt about it. But it’s not the only one. Bitcoin also offers on-chain transparency that can’t be found in the traditional financial space, which, combined with its fixed supply, trustlessness, and permissionless nature, makes BTC a powerful asset.

However, it also carries real risks, particularly volatility and emotional cycles, which have shaped Bitcoin’s transformation from an experiment into an institutional asset class.

Now, with Bitcoin ETFs, which marked a historic milestone in that transition, the leading cryptocurrency has captured hundreds of billions in new inflows, and at the same time, making it easier for institutional investors to short, hedge, and arbitrage Bitcoin exposure using a familiar financial infrastructure.

However, this isn’t just bearish positioning, but rather a reflection of a more efficient market and better risk management. The recent study reinforces this idea, suggesting that short sellers in these ETFs behave as informed traders who exploit short-lived, sentiment-driven mispricing.

It’s too early to say, though, and as more data accumulates, institutional ownership deepens, and the ecosystem expands, the behavior of both long and short investors in Bitcoin ETFs is likely to evolve. But what’s absolutely clear is that Bitcoin is officially in its institutionalization phase, which is expected to introduce price stability and transform the market into a more sophisticated financial ecosystem.

References

1. Goyal, A., Reed, A. V., Smajlbegovic, E., & Soebhag, A. (2024, August 30). Stealthy shorts: Informed liquidity supply. Swiss Finance Institute Research Paper No. 24-75, Journal of Financial Economics, forthcoming. https://ssrn.com/abstract=4941397
2. Onishchenko, O. (2026). Betting against Bitcoin: Evidence from spot Bitcoin ETFs. Journal of Behavioral and Experimental Finance, 50, 101191. https://doi.org/10.1016/j.jbef.2026.101191