Exchange reserves decline + ETF attracting funds: Bitcoin supply structure enters a new phase

As of May 9, 2026, Gate market data shows that Bitcoin’s current price is $80,442.4, with a 24-hour increase of 1.25% and a cumulative rise of 11.76% over the past 30 days. Compared with short-term price fluctuations, events taking shape at the market-structure level deserve more attention: U.S. spot Bitcoin ETFs have recorded net inflows for multiple consecutive days, as institutional capital absorbs Bitcoin from the market at a pace far faster than new supply. Estimates indicate the ETFs’ current weekly average buy volume is equivalent to about 33 days of all output from miners—an emerging supply squeeze driven by a supply-demand mismatch is accelerating its formation.

ETF Buying Pressure and Market Supply “Asymmetric Warfare”

In early May 2026, U.S. spot Bitcoin ETFs continued the strong inflow momentum that began in late April. On May 1, the market recorded net inflows of about $630 million; BlackRock’s IBIT led with $284 million, followed by Fidelity’s FBTC with $213 million. On May 5, ETFs again recorded net inflows of about $467 million, pushing cumulative net inflows to approximately $59.72 billion, and total net asset value rose to about $108.98 billion. On May 6, inflows slowed but remained positive, with about $45.85 million in net inflows, marking net inflows for five consecutive trading days.

Based on a five-day window from May 1 to May 5, the total ETF net inflows were approximately $1.55 billion. Converted at an average Bitcoin price of roughly $80,000 over the same period, this equals about 19,375 BTC. If the late-April multi-day inflow period is included as well, within less than three weeks the ETFs absorbed more than 33,000 BTC from the market.

Meanwhile, after the fourth halving, the network’s daily new supply has fallen from about 900 BTC to around 450 BTC. Using this as the benchmark, the amount of BTC absorbed during the ETF period is equivalent to about 51 days of the miners’ total output—weekly average absorption corresponds to about 33 days of mining volume. Put more intuitively: during the window when capital concentrates flowing in, the ETFs buy away more than 5 times the amount of Bitcoin that miners produce as daily new issuance.

Four Structural Nodes of Supply Contraction

The current supply squeeze is not an isolated event, but the result of multiple factors stacking over time.

April 2024: The Fourth Halving. Bitcoin block rewards drop from 6.25 BTC to 3.125 BTC, and daily new supply is halved to about 450 coins. The annual inflation rate officially falls below 1% to around 0.85%, making Bitcoin one of the mainstream assets with the lowest inflation globally.

All of 2025: Accelerated ETF Capital Accumulation. Since U.S. spot Bitcoin ETFs were launched in January 2024, cumulative net inflows reached a high of about $61.19 billion as of October 2025; afterward, a correction-and-outflow phase occurred.

Q1 2026: Large-Scale Miner Liquidations and Capital Reversal Moving in Parallel. In Q1, listed mining companies sold more than 32,000 BTC in total, setting a quarterly miner-disposal record—exceeding the total net selling amount for all of 2025. In the same period, ETFs went through a 3- to 4-month outflow window, with cumulative net outflows of about $6.38 billion.

April to May 2026: Explosive Demand-Side Rebound. In April, ETFs recorded net inflows of about $1.97 billion—the strongest monthly performance since 2026 began. Entering May, the intensity of inflows further increased, and continuous inflows from May 1 to May 6 provided a volume foundation for prices to break above $80,000. But then a reversal appeared: on May 7, ETFs recorded net outflows of $277 million, the first turn after five consecutive trading days of net inflows; on May 8, net outflows continued at about $145.6 million.

Data and Structural Analysis: Quantifying the Supply-Demand Gap

Supply Side: Exchange Reserves Are Being Drained

On-chain data shows that Bitcoin reserves held by centralized exchanges worldwide have fallen to about 2.67 million BTC, the lowest level since December 2017. Since February 2026 alone, the combined reserves of Binance, OKX, and Gemini have decreased by nearly 100,000 BTC, worth more than $8 billion.

The decline in exchange reserves is not cyclical fluctuation, but persistent one-way outflow. From a structural perspective, since 2023, about 800,000 BTC have been transferred from exchanges to private wallets or institutional custody addresses—equivalent to roughly 4% of the current total circulating supply. More importantly, even if Bitcoin’s price saw a sharp pullback in early 2026, exchange balances did not rebound; instead, the decline accelerated. The phenomenon of reserves not rising but falling during this price pullback is fundamentally different from typical patterns before this cycle.

Demand Side: ETFs Are the Largest Absorbers

U.S. spot Bitcoin ETFs currently hold a combined total of about 1.32 million BTC, roughly 7% of circulating supply. Among them, BlackRock’s IBIT holdings are about 813,953.5 BTC, accounting for 3.876% of the 21 million maximum supply. Listed for only about 16 months, it has already become the largest spot Bitcoin ETF globally by scale. From the custody structure perspective, about 84% of U.S. spot Bitcoin ETF assets are held with Coinbase Custody as the custodian; the custody assets amount to roughly $77 billion. The high concentration of assets in a single custodian has triggered market discussion about potential systemic risk dimensions.

Below is a comparison of the core data for Bitcoin market supply and demand:

The Role of Miners: From Being Supply-Only to a Game with Both Supply and Buyers

Miners are traditionally seen as the persistent selling force in the market. In Q1 2026, listed mining companies carried out record levels of selling, disposing of more than 32,000 BTC. However, after the BTC price rebounded to above $80,000 in early May, miners’ cost-of-production prices—an essential metric that measures unit-hashrate income—have recovered to just above breakeven levels. After some miners’ profitability improves, they reduce selling, further tightening the market’s available tradable supply.

A key data point worth noting: BlackRock’s IBIT alone accumulated about 31,627 BTC in April 2026, while global miners’ total output in the same period was about 13,500 BTC. The monthly buying volume of a single ETF product has already exceeded 2.3 times the total output of all miners worldwide in that period.

Dissecting Market Sentiment: A Three-Way Game of Bullish, Cautious, and Skeptical Views

The factual data showing supply tightening is relatively clear, but market interpretations of what it means for price are sharply divided.

Mainstream Bullish Logic: The supply-demand gap continues to widen. Institutions continuously absorb liquid Bitcoin through two channels—ETFs and corporate treasuries—while new supply has sharply decreased after the halving. The combined effect of these two trends will lead to a continued contraction of “tradable circulating supply,” forming a structural basis for price repricing. Logically, when buy-side demand exceeds sell-side supply, prices tend to move upward. Since 2023, about 800,000 BTC have exited the liquid market; combined with ETFs absorbing tens of thousands of BTC per week, bullish views argue that this “silent accumulation” forms a pressure that cannot be ignored on the supply-demand curve.

Cautious Observation: Since the historical high in October 2025, cumulative ETF net outflows of about $6.38 billion have not been fully offset. Inflows/outflows of $1.6 billion and $206 million occurred in January and February respectively, showing that institutional capital inflows do not have a one-way inevitability. In addition, Glassnode data shows that as prices keep rising, spot trading volume keeps shrinking—indicating that this rally is driven more by leveraged shorts being forced to cover than by strong spot buying. At the same time, total open interest has risen back to nearly $30 billion. CryptoQuant analysts note that open interest recorded the largest increase since 2026 and has already surpassed the increase during the formation period of the 2025 historical high. This means high-leverage positions amplify volatility and make market structure more fragile. Historically, the combination of “leverage expansion and spot contraction” often signals a rally with fragile foundations; once concentrated long liquidations occur, it can trigger a sharp pullback.

Skeptical Voices: Some believe the “supply crisis” narrative is overused in cyclical markets. According to Glassnode, Bitcoin’s non-liquid supply has surged to about 14.37 million BTC, meaning more than 72% of mined BTC is classified as non-liquid—held by long-term investors, cold-wallet holders, and institutions holding for multiple years. As prices rise further, some of this “sleeping supply” could re-enter circulation at any time, offsetting the supply pressure created by ETF demand. On May 7, ETF flows turned back to net outflows of $277 million, ending the prior streak of net inflows for five consecutive trading days; on May 8, outflows continued at about $145.6 million. Two consecutive days of capital withdrawal serve as a reminder that market signals are not one-directional.

Industry Impact Analysis: Shifts in Pricing Power and Reshaping Market Structure

Bitcoin’s market pricing logic is undergoing a shift in its focal point—from on-chain to off-chain. Traditionally, price discovery in Bitcoin’s spot market has heavily relied on exchange order books, driven by real-time battles between retail traders and market makers. With ETFs, another pricing pathway is introduced: institutional investors convert fiat capital into ETF shares through primary-market subscriptions, while market makers hedge by buying spot Bitcoin.

After the ETF net asset share surpasses 5%, the ETF’s daily subscription and redemption data begins to exert marginal pricing influence on spot prices. As of May 7, this ratio reached 6.67%, and the ETFs’ total net asset value is about $106.766 billion. If it rises toward around 10%—based on the current pace of growth, this threshold may appear in early 2027—ETF capital flows could become a more important forward-looking price indicator than exchange spot trading volume, fundamentally changing the market analysis framework.

Deeper still, the structure of market participants is changing. In early 2026, the proportion of BTC held by institutions in the circulating supply range is roughly 24% to 28%, up about 17 percentage points from 2020. Institutional funds operate over longer cycles, and their sensitivity to liquidity, compliant custody arrangements, and macro policy signals is far higher than that of retail participants. This could continue to reduce the volatility of Bitcoin’s price time series, gradually shifting its asset attribute from a “high-risk alternative asset” toward a “non-sovereign digital reserve asset.”

At the same time, ETF assets are highly concentrated at Coinbase Custody—about 84% of assets held through a single custodian, with a scale of roughly $77 billion. While this concentration improves operational efficiency, it also brings systemic-risk dimensions that are worth sustained attention.

Conclusion

Bitcoin’s current supply tightening is not driven by a single-event factor, but by the combined forces of four variables: the fourth halving, large-scale ETF capital inflows, ongoing allocations by enterprises and sovereign institutions, and accumulation behavior by long-term holders. With exchange reserves falling to a seven-year low and ETFs absorbing tens of thousands of BTC each week, a clear supply-demand signal emerges: beneath the appearance of relatively stable prices, Bitcoin’s liquid supply is tightening at the fastest pace in history.

But it’s equally important to keep analytical boundaries in mind. The consecutive two-day ETF net outflows from May 7 to May 8 remind the market that institutional capital is not only buying in one direction. Supply tightening is a supportive condition for prices, not an upward trigger—the actual price path still depends on whether demand can sustain the current inflow pace and whether the macro environment continues to provide ample room for risk assets. In a crypto market where leverage and liquidity intertwine, structural bullish logic and cyclical volatility risks will always coexist; the latter will not disappear just because the former exists.