---
title: "US Spot Bitcoin ETFs Secure $526M as BlackRock IBIT Inflows Outpace Rivals"
description: "A $665.2 million surge into BlackRock's IBIT delivered the category's largest single-day inflow in a month, despite redemptions across rival funds."
url: https://basisdesk.news/news/us-spot-bitcoin-etfs-net-inflows-blackrock-ibit
published: 2026-10-20T08:36:23.923Z
modified: 2026-10-20T08:36:23.923Z
section: Institutions & ETFs
author: Basis Desk Newsroom (AI-generated, source-verified)
sentiment: neutral
tickers: [BTC, ETH]
tags: [etf, bitcoin, blackrock, institutional-flows, ethereum]
license: Quote with attribution to Basis Desk (basisdesk.news). Not financial advice.
---

# US Spot Bitcoin ETFs Secure $526M as BlackRock IBIT Inflows Outpace Rivals

A $665.2 million surge into BlackRock's IBIT delivered the category's largest single-day inflow in a month, despite redemptions across rival funds.

## At a glance

- **What happened:** US spot bitcoin ETFs brought in $526.6 million on Monday, propelled by $665.2 million in net inflows to BlackRock's IBIT.
- **Why it matters:** The day marked the largest single-day inflow in a month, turning weekly momentum positive despite outflows across ether funds.
- **Who is affected:** US spot ETF issuers, including BlackRock, Fidelity, and Grayscale, alongside institutional investors in digital asset trusts.
- **What's next:** Upcoming trading sessions will determine whether spot bitcoin ETF flows can offset remaining October net deficits.
- **Primary source:** [Bitcoin ETFs just saw their biggest day in a month thanks entirely to BlackRock](https://www.coindesk.com/business/2026/10/20/bitcoin-etfs-just-saw-their-biggest-day-in-a-month-thanks-entirely-to-blackrock) — coindesk.com

## Key points

- US spot bitcoin funds netted $526.6 million on Monday, marking their highest single-day inflow since Sept. 22.
- BlackRock's IBIT took in $665.2 million, offsetting $83.6 million in FBTC outflows and $54.9 million from GBTC.
- US spot ether funds lost $103.3 million in their fourth consecutive outflow day, led by $95.4 million from ETHA.

## Editorial remark

- **Context:** The surge follows a soft prior week that witnessed $228.5 million in withdrawals, leaving month-to-date net flows for the bitcoin funds down about $90.5 million.
- **Impact:** Capital allocations remain highly polarized toward BlackRock's vehicle, as rival issuers like Fidelity and Grayscale continue to experience steady redemptions.
- **Watch:** Subsequent daily net flow prints across the 11 spot bitcoin funds to determine whether total October flow metrics flip positive.

US spot bitcoin exchange-traded funds registered $526.6 million in net inflows on Monday, logging their largest single-day tally in nearly a month [1]. The performance was driven almost exclusively by BlackRock’s iShares Bitcoin Trust (IBIT), which attracted $665.2 million in capital [1]. At the time of writing, $BTC traded around $81,403, down 1.7% over the trailing 24 hours.

The massive allocation into IBIT represented the fund's largest daily net inflow since Oct. 7 of last year, according to data from SoSoValue [1]. The aggregated intake was the highest for the US spot cohort since Sept. 22, when vehicles secured a collective $714.7 million [1]. However, investor demand remained highly concentrated within the market leader, as competing issuers grappled with redemptions [1]. Fidelity’s FBTC lost $83.6 million, Grayscale’s GBTC posted $54.9 million in net outflows, and the remainder of the cohort logged flat flows during the trading session [1].

## Ether ETFs Extend Outflow Streak

Monday's influx more than compensated for the $228.5 million in aggregate redemptions logged during the prior week, following broader market pullbacks detailed in [US spot bitcoin and ether ETF weekly outflows](https://basisdesk.news/news/us-spot-bitcoin-ether-etfs-weekly-outflows-october) [1]. Despite the turnaround, net flows across the bitcoin suite remain approximately $90.5 million in negative territory for the month of October, based on CoinDesk calculations using SoSoValue figures [1].

Conversely, US spot ether products diverged sharply, shedding $103.3 million in their fourth straight session of net withdrawals [1]. The contraction in $ETH investment vehicles was largely headlined by BlackRock’s iShares Ethereum Trust (ETHA), which recorded $95.4 million of the day's redemptions [1]. Market observers are closely monitoring whether consecutive institutional allocations into IBIT can sustain net positive momentum for the wider sector heading into late-month trading sessions [1].

## Sources

1. [Bitcoin ETFs just saw their biggest day in a month thanks entirely to BlackRock](https://www.coindesk.com/business/2026/10/20/bitcoin-etfs-just-saw-their-biggest-day-in-a-month-thanks-entirely-to-blackrock) — coindesk.com, 2026-10-20

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Basis Desk Newsroom · AI-generated, source-verified · https://basisdesk.news/about/how-we-use-ai