Supply and Scarcity · Published

Bitcoin Supply Shock: ETFs Returned 14,596 BTC in 20 Days

Over the twenty reporting sessions through November 2, US spot Bitcoin ETFs returned 14,596.2 BTC to the market while miners created 9,000 BTC — an absorption ratio of -1.62x. The bitcoin supply shock this column tracks is not merely absent: the funds gave back 32.4 days of global issuance in twenty trading days, the weakest reading since July 23.

That also settles the bet this column placed seven days ago. Last Tuesday the figure was -0.42x, and the arithmetic said the funds needed only +1,424.1 BTC over five sessions to hold it there. They delivered -9,421.6 BTC. The projection for a zero-flow week was -0.58x; the print is nearly three times worse, and the whole gap is flow — the fifteen retained sessions contributed exactly the -5,174.6 BTC forecast.

How much bitcoin did ETFs absorb against new supply this week?

Every figure here comes from the absorption series behind the institutional signal dashboard, which converts each session's net ETF flow to BTC at that session's close and divides by the Bitcoin mined over the same sessions. The series runs 721 reporting sessions from January 11, 2024 through November 2, 2026, and the API's own supply-absorption block agrees to four decimals: -14,596.17 divided by 9,000 is -1.6218.

Unlike last week, the windows now mostly agree:

Four of five windows are negative and they deepen as the window shortens — the opposite of last week, when the sign alternated four times down the same list. A week ago the negative headline was an artifact of two opposing days cancelling; this week the short windows are worse than the long ones, which is what sustained distribution looks like rather than noise. Only the sixty-session frame still carries the summer's accumulation, and at +1.99x it is the one window that would let someone call this a supply shock with a straight face.

Two sessions returned 30 days of bitcoin daily issuance

The week's damage sits in its last two prints, consecutive reporting sessions — the Friday crash and the Monday after:

October 30 is the 10th worst session of all 721 on record, in the bottom 1.4%; November 2 ranks 38th. Between them they returned 13,506.5 BTC — 30.0 days of global issuance in two sessions. The three sessions before absorbed 4,084.9 BTC, so the week's entire -9,421.6 BTC is those two days, and then some.

No source retrieved this morning identifies a catalyst for the October 30 print, and this column will not invent one. Friday's weekly recap covers the price action; the supply arithmetic can add that the outflow was broad rather than idiosyncratic — five of twelve products reported it, FBTC at -$201.0 million and ARKB at -$129.5 million alongside IBIT's -$233.7 million.

IBIT went from the only fund holding the category up to the largest seller

Monday's ETF flow column reported that BlackRock's IBIT was the single product keeping the twenty-session number from collapsing, at +$578.3 million against -$1,386.8 million for every other US spot fund combined. That was correct through October 30. One session later it is not.

On November 2 IBIT reported -$405.3 million — its tenth-worst session of the 721 on record — cutting its twenty-session total to +$103.1 million, an 82% decline in one session and the category's largest five-session outflow at -$338.7 million. Across the same five sessions the twelve products posted 1 positive, 7 negative and 4 flat legs; only 8.3% were net buyers. This is not rotation between issuers but the whole complex moving one way, led by the fund that had been the exception.

Where this bitcoin supply shock reading sits against its own history

The ratio is unbounded, so the level means little without its distribution. Across all 702 rolling twenty-session readings, -1.62x sits at the 16.5th percentile, against a median of +2.05x. The range runs from -8.62x on June 10 this year to +11.82x on November 21, 2024. This is a genuinely weak reading — bottom sixth of the record — but nowhere near the worst, and five times better than June's trough.

Against 2026 alone it is less remarkable. This year's 210 rolling readings have a median of just +0.72x and 44.3% are negative, putting today's -1.62x at the 31st percentile — a negative reading remains close to a coin flip in 2026. Whatever bitcoin supply absorption through this channel was in 2024, it is not what 2026's data describes.

The speed is unexceptional, worth saying because the week felt violent. The reading fell 1.21 points in five sessions; 27.1% of the 697 five-session changes on record are steeper declines, the record being -5.97 on November 4, 2025. Two bottom-5% sessions produced a middling rate of change, because the window was already weak.

Why the next reading improves to -0.74x even on zero flow

The same arithmetic runs forward, and this week it cuts in the funds' favour. Over the next five sessions the window loses October 6 through October 12, which contributed -7,963.4 BTC, including -5,821.0 BTC on October 7 alone. What remains is the fifteen sessions from October 13 to November 2, summing to -6,632.7 BTC. If the next five sessions produce exactly zero net flow, the reading published next Tuesday is -6,632.7 divided by 9,000, or -0.74x.

That is the mirror image of last week, when roll-off was doing the damage. The hurdles from Monday's $76,805 close:

The honest reading: the headline will probably improve next week, and that will be a statement about October 7 leaving the window rather than about anyone buying. The $102 million daily pace needed to reach zero is a bar the sixty-session average clears comfortably — and one this week missed by over $240 million a session.

Bitcoin daily issuance is 450 BTC until the 2028 halving

The denominator is why this metric is worth computing. Bitcoin daily issuance has been fixed at 450 BTC since the April 2024 halving cut it from 900, and stays there until the next halving in 2028 takes it to 225. It does not respond to price, ETF demand, hashrate or miner profitability: more competition between miners produces the same coins at higher cost.

That fixed step is what makes the comparison meaningful: every other bitcoin scarcity measure rests on behavioural assumptions about holders, exchange balances or lost coins, and the issuance line needs none. The bitcoin halving supply schedule does mean cross-era care — the first 72 sessions here ran at 900 BTC a day, so a -5x then describes twice the coins it does now.

2026 is flat in dollars and 13,747 BTC lighter in coins

This finding only appears when you measure in coins, and this week turned it stark. Across 210 reporting sessions in 2026, US spot Bitcoin ETFs have taken in a net +$55.3 million while absorbing -13,746.7 BTC — a year flat in dollars and negative in Bitcoin, a ratio of -0.15x against 94,500 BTC mined.

The cause is the conversion price. Dollars arrived on inflow sessions at a flow-weighted average of $76,381 a coin and left on outflow sessions at $73,208 — money came in when Bitcoin was dearer by $3,173 a coin, or 4.3%, so near-identical dollar totals moved materially different quantities of Bitcoin. A fund complex can report a positive year in its reporting currency and still have supplied coins on net. October alone ran -$515.9 million and -6,995.4 BTC across 22 sessions, or -0.71x.

ETFs hold 671,651 BTC, or 3.2% of all bitcoin that will exist

Cumulatively, the ETF channel has absorbed 671,651.3 BTC since January 2024 — 3.20% of the 21 million coins that will ever exist. Against the 356,850 BTC mined across the same reporting sessions that is 188%, but the series counts weekdays only while mining runs daily. On a calendar basis roughly 506,700 BTC have been issued since January 11, 2024, so the channel has taken about 133% of new supply — the better answer to ETF demand vs bitcoin mined as most readers mean it.

The total peaked at 748,575.4 BTC on October 9, 2025 and now sits 76,924.1 BTC below that mark, a gap that widened by nearly 10,000 coins this week alone. Whatever the ETF channel is, it is not a ratchet.

Strategy bought 811 BTC in the week ETFs returned 9,422

Corporate treasury demand is the other institutional bid on new supply, and this week it moved opposite the funds. Strategy's 8-K of November 2 reports direction "acquired" and a btc_change of +811 BTC, bought for $65.5 million at an average of $80,846, lifting holdings to 849,327 BTC at a cost basis of $64.08 billion, or $75,451 a coin. It ends the single zero-purchase filing last Thursday's treasury column covered.

The scale comparison is the point. Strategy's last four filings total 1,328 BTC against roughly 12,600 BTC of calendar issuance over those four weeks, about 10.5% — while the ETF channel returned 9,421.6 BTC in five sessions, seven times what Strategy bought. Thursday owns what this means for the company; for the supply arithmetic the corporate bid is real but an order of magnitude too small to offset the funds.

What this does to bryptoflows' own composite is severe. The institutional signal scores -41.5 on data through November 2, with all eight components live — 38.1 points below the -3.4 Friday's signal column reported. Supply absorption normalises to -95.4 and contributes -19.1, still the largest single drag but no longer the only one. Last week absorption was cancelling seven positive components; this week it has company.

What this bitcoin scarcity measure cannot see

The absorption ratio is precise about a narrow thing, and the limits need restating every week.

For the dollar-level view of the same tape, Monday covered November's opening flows, and last Tuesday's absorption read set the hurdle this week missed. Live figures sit on the ETF flow dashboard and the institutional signal dashboard, where the absorption chart is drawn.

All figures come from bryptoflows' read-only API — ETF flows from Farside Investors, prices from Hyperliquid, Strategy detail from SEC filings — current through the November 2 close and 8-K.