---
title: "US Bitcoin ETFs draw $527M in biggest showing since September"
description: "2026-10-20にCointelegraph, CoinDesk +2が報道。検知後1時間でBTC -0.12%。 Cointelegraph: “BlackRock’s IBIT led the gains with $665.2 million in inflows, offsetting withdrawals from Fidelity and Grayscale, while other funds recorded no net flows.” 検知後1時間でBTCは-0.12%変動。価格観測は因果関係を証明しません。"
language: ja
canonical: "https://whycoinmoves.com/ja/events/bitcoin-8a04a927f96ab9"
published: 2026-10-20T05:49:57.000Z
updated: 2026-10-21T00:22:01.000Z
indexable: false
---

# US Bitcoin ETFs draw $527M in biggest showing since September

2026-10-20にCointelegraph, CoinDesk +2が報道。検知後1時間でBTC -0.12%。 Cointelegraph: “BlackRock’s IBIT led the gains with $665.2 million in inflows, offsetting withdrawals from Fidelity and Grayscale, while other funds recorded no net flows.” 検知後1時間でBTCは-0.12%変動。価格観測は因果関係を証明しません。

Attributed sources: [Cointelegraph](<https://cointelegraph.com/markets/bitcoin-etfs-527m-inflows-biggest-since-september>), [CoinDesk](<https://www.coindesk.com/business/2026/10/20/bitcoin-etfs-just-saw-their-biggest-day-in-a-month-thanks-entirely-to-blackrock>), [The Block](<https://www.theblock.co/news/markets/2026-10-20-blackrock-ibit-bitcoin-etf-665-million-421102>), [Decrypt](<https://decrypt.co/381444/bitcoin-etfs-best-day-nearly-month-blackrock-does-most-buying>)

## Key facts

Cointelegraph: “BlackRock’s IBIT led the gains with $665.2 million in inflows, offsetting withdrawals from Fidelity and Grayscale, while other funds recorded no net flows.” 検知後1時間でBTCは-0.12%変動。価格観測は因果関係を証明しません。
Evidence strength: 複数メディア報道, 4 publisher group(s) (Cointelegraph, CoinDesk, The Block, Decrypt); this describes source coverage, not truth or causation.
検知後の観測リターン：1時間: -0.12% (20/10/2026, 05:52 → 20/10/2026, 06:52, UTC; OKX · USDT)。記載のない時間枠は未取得です。
直近30日間の時間足絶対リターンの99パーセンタイルは1.23%（OKX · USDT；基準 20/10/2026, 05:49, UTC）です。時間足基準は分単位の変動と直接比較できません。

## Returns after site detection

| Window | Return | BTC | Difference from BTC | Actual sampled interval (UTC) | Source |
| --- | --- | --- | --- | --- | --- |
| 5分 | — | — | — | — | — |
| 1時間 | -0.12% | -0.12% | 0.00 pt | 20/10/2026, 05:52 → 20/10/2026, 06:52 | OKX · USDT |
| 24時間 | — | — | — | — | — |

## Historical hourly baseline

| Metric | Value |
| --- | --- |
| Ready | true |
| Coverage | 99.9% (719/720) |
| Median absolute hourly return | 0.15% |
| 99th percentile of absolute hourly returns | 1.23% |
| BTC beta | 1.00 |
| Source / cutoff (UTC) | OKX · USDT / 20/10/2026, 05:49 |

## Claims and open questions

- No independently verified causal explanation is available.

## Source evidence

- [US Bitcoin ETFs draw $527M in biggest showing since September](<https://cointelegraph.com/markets/bitcoin-etfs-527m-inflows-biggest-since-september>) — Cointelegraph; published 20/10/2026, 05:39; received 20/10/2026, 05:49 (UTC).
- [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; published 20/10/2026, 08:24; received 20/10/2026, 08:27 (UTC).
- [BlackRock’s IBIT Bitcoin ETF draws $665 million inflow, highest since October 2025](<https://www.theblock.co/news/markets/2026-10-20-blackrock-ibit-bitcoin-etf-665-million-421102>) — The Block; published 20/10/2026, 07:05; received 20/10/2026, 08:55 (UTC).
- [Bitcoin ETFs Post Their Best Day in Nearly a Month as BlackRock Does All the Buying](<https://decrypt.co/381444/bitcoin-etfs-best-day-nearly-month-blackrock-does-most-buying>) — Decrypt; published 20/10/2026, 18:31; received 20/10/2026, 18:34 (UTC).


## Recent BTC events and market reactions

公開基準を満たした他のBTCイベントはまだありません。

- [Full coin archive](<https://whycoinmoves.com/ja/coins/bitcoin>)

## 他銘柄の直近の価格急変動イベント

- [ZEC: ZECはなぜ1分で0.74%下落したのか？根拠・市場データ検証 · 2026-10-23](<https://whycoinmoves.com/ja/events/zcash-move-1792720080>)
- [SHIB: SHIBはなぜ1分で0.74%上昇したのか？根拠・市場データ検証 · 2026-10-23](<https://whycoinmoves.com/ja/events/shiba-inu-move-1792719780>)
- [ADA: ADAはなぜ5分で1.60%下落したのか？根拠・市場データ検証 · 2026-10-22](<https://whycoinmoves.com/ja/events/cardano-move-1792687800>)
- [価格急変動](<https://whycoinmoves.com/ja/topics/market>)

## Research for this archive

- [Altcoin beta to Bitcoin: BTC, ETH, SOL and DOGE hourly returns](<https://whycoinmoves.com/ja/research/hourly-returns-and-bitcoin-beta.md>)
- [Perpetual funding rates and annualized yield: a 2025 comparison](<https://whycoinmoves.com/ja/research/funding-rates-versus-investor-returns.md>)
- [Bitcoin halving and bull markets: evidence from four halvings](<https://whycoinmoves.com/ja/research/bitcoin-halving-and-market-cycles.md>)
- [Bittensor (TAO): Bitcoin beta, volatility and the AI crypto narrative](<https://whycoinmoves.com/ja/research/tao-bitcoin-risk-and-ai-narrative.md>)

[Methods and limitations](<https://whycoinmoves.com/ja/methodology>)
Publisher count is not independent evidence count. Price changes cannot verify news or prove causation.