BlackRock's IBIT Pulls $665.2M Into Bitcoin (BTC) ETF in Biggest Day Since October 2025

The $526.7 Million Net Day

$665.2 million went into BlackRock's IBIT in a single session, the largest one-day haul for a US spot Bitcoin (BTC) ETF since October 2025. The daily flow tally from Farside puts net inflows for the US spot complex at $526.7 million on Monday, the strongest day in nearly a month, with most other funds flat or bleeding out while BlackRock's vehicle carried the session almost alone. IBIT's haul exceeded the complex's entire net figure, an unusual concentration for a session this strong. The dispersion says the bid sat in one vehicle, the pattern that usually accompanies consolidation rather than breakout. It also marks a turn for a lineup that logged outflows of $910 million in a second straight weekly retreat earlier this month. Monday, 2026-10-19, was the previous US trading day, and daily creations are tallied after the close, so this print is the freshest complete read on institutional demand available this morning.

The plumbing explains why the figure matters. Spot ETF creations oblige the issuer to buy Bitcoin (BTC) outright, so a day of that size is direct, on-exchange demand for the largest proof-of-work asset rather than a paper commitment. Flows of this size normally filter into the market the same day, since issued shares settle into purchases at once. Yet none of it broke the ceiling. CoinGecko data put the Bitcoin (BTC) price at about $81,516 at 11:00 UTC on Tuesday, down 0.85% over 24 hours, and the rate has since added 0.2% to sit near $81,700, still short of $82,000. The $82,000 line has capped each attempt so far. Ethereum traded near $2,386 with a 1.35% loss over the same window. That gap is the tension of the session: institutional money arrived in size, and the level above did not give way.

KOSPI's 3.73% Slide and a Put-Heavy Tape

Asia's chip complex gave the risk mood little help on the same day. A Yonhap report on the session shows South Korea's KOSPI index shedding 215.27 points, a 3.73% drop, to close at 5,552.74 after touching an intraday low of 5,493.24. Samsung Electronics finished 2.98% lower and SK Hynix lost 4.23%, its weakest close since April. The report ties the slide to renewed doubts over AI investment spending and to protests in France that compressed risk appetite, with traders booking profits across chip names.

Derivatives traders spent the day paying for downside protection instead. A put gives its buyer the right to sell at a fixed strike, so heavy put volume maps where traders expect trouble. Public options data shows about 11,562 Bitcoin (BTC) in puts traded over the 24 hours to 11:00 UTC against roughly 7,660 in calls, a ratio of 1.5 to 1. The most active single contract was the put expiring October 30 with an $80,000 strike, at about 832 contracts, and the third most active was the same-expiry put struck at $78,000. Every one of the five most-traded contracts was a put; the other three were deep out-of-the-money December 25 puts struck between $35,000 and $50,000. The skew reads as month-end hedging rather than outright panic: the heaviest flow sits just below spot, where protection is cheapest into an expiry five days away, while the far December strikes look like cheap tail insurance. October has been soft regardless: our running tally puts October's -2.2% return against a +18.34% historical average for the month. Earlier coverage tracked the approach to the $81,356 support on weak ETF demand; Monday's inflow is the first real test of whether that demand base has turned.

$81,364 Support Decides the Range

Spot stands at $81,660 on our live reading, down about 1.1% over 24 hours, wedged between the two levels that decide the short-term picture. Below, the $81,364 support carries a 91/100 score on our composite support and resistance scoring, with the SMA 50, the Fibonacci 0.236 retracement and the Ichimoku cloud top converging there; above, the $82,470 pivot scores 70/100. For the sideways read to hold, $81,364 has to hold. Funding sits near neutral at 0.0029%, and 65.9% of accounts are still long, a 1.93-to-1 ratio that says the HODL side of the book outweighs the shorts. Momentum gauges stay soft, with RSI at 46.3 and a bearish MACD, so a daily close back above $82,470 is the trigger that would confirm the upper edge of the range. The full map is in our Bitcoin technical analysis.