Bitcoin supply squeeze: ETF accumulation vs 72% illiquid supply

ETF volatility and market noise

Bitcoin trades at $81,072.00 on September 19, 2026. I view the erratic ETF movements as a smokescreen for deeper structural changes. On September 15, spot Bitcoin ETFs experienced a $450.3 million outflow, led by a $214.8 million drop in Fidelity’s FBTC. This followed a $160.0 million inflow on September 14. On September 16, outflows hit $296.0 million, with BlackRock’s IBIT losing $144.1 million and Ark & 21Shares’ ARKB losing $84.4 million. On September 15, Grayscale’s GBTC lost $44.1 million and Bitwise’s BITB lost $12.4 million. On September 10, outflows reached $282.6 million, with ARKB losing $164.3 million. On September 3, they saw a $730.9 million inflow, with IBIT gaining $454.0 million and ARKB gaining $137.7 million. The concentration of liquidity in BlackRock and Fidelity makes the daily movements of smaller funds like VanEck’s HODL or WisdomTree’s BTCW mostly meaningless. I conclude that watching small-cap ETF flows is a waste of time. The 14-day relative strength index stands at 81.5, which is above the 70 level used to indicate stretched momentum. The average directional index is 38.5, which indicates an established trend without showing direction.

Date	Total Net Inflow/Outflow	Primary Driver
Sep 17, 2026	+$159.5M	IBIT (+$183.7M)
Sep 16, 2026	-$296.0M	IBIT (-$144.1M)
Sep 15, 2026	-$450.3M	FBTC (-$214.8M)

Whale accumulation and the retail trap

Glassnode data shows Bitcoin’s illiquid supply hit 14.3 million BTC, which covers 72% of the 19.92 million circulating supply. This figure includes coins held by entities for over seven years without selling. While retail holders with less than 10 BTC have been net sellers for over a month, large whales holding 10,000 BTC or more have maintained a neutral-to-positive balance trend since the price fell to $80,000 in late November. I find the retail selling trend completely pathetic compared to the strength of the whales. These large players are scooping up almost thrice the new issuance. This accumulation includes a rise in coins held by entities for over seven years by more than 422,430 coins since January 1. The number of BTC held by entities for over seven years without selling has risen by more than 422,430 coins since January 1, reaching a new high of 14.3 million BTC. Fidelity projects that long-term holders and corporate treasuries could lock up over 6 million BTC by 2025. This happens because the supply held by publicly traded companies with at least 1,000 BTC has increased quarter-over-quarter since 2020. Can the market truly sustain growth when 72% of the supply is effectively removed from circulation?

The math of the supply squeeze

The supply-demand imbalance drives the long-term outlook. Since the 2024 halving, miners produce an average of 450 BTC daily, totaling 81,000 coins over the last six months. During that same period, U.S. spot ETFs and MicroStrategy purchased 140,000 BTC. This means institutions drain nearly double the amount from the market that miners produce. You should ignore the daily $10 million fluctuations in funds like Franklin Templeton’s EZBC or Valkyrie’s BRRR if you want to track the real trend. I expect a significant supply shock in the second half of 2026 because exchange reserves reached an eight-year low. The math is simple: 21 million total coins against massive institutional demand. Analysts at CoinCodex expect the average price to hit $85,469 in Q3, while DigitalCoinPrice expects it to reach $75,181.18 in Q3. The price reached an intraday high of $126,287.15 on October 6, 2025. Changelly predicts the price will reach $79,737.54 in Q3. The current price is $81,072.00, which is 8.9% below the 2025 year-end close. The 200-day simple moving average remains above the market price.