Farside has filled in the 9/21 US spot ETF flow data—it's not a new day; it's IBIT / ETHA from a dash to actual numbers.

$BTC Full-day net inflows, from the morning estimate about +$617.6M → **+$999.0M** (a big day on the scale of the past ~12 months). Breakdown: IBIT +$381.4M, ARKB +$289.1M, FBTC +$238.8M, MSBT +$61.7M, BITB +$21.6M。

$ETH Synchronized inflows up to **+$270.0M** (morning approx. +$147.1M): ETHA +$110.1M, FETH +$73.0M, Grayscale Mini ETH +$59.3M, ETHB +$12.8M.

1️⃣ Same trading day, product flows—this is not price-call trading.

2️⃣ In the morning there was a lack of IBIT/ETHA; after filling in, the total added up to roughly the $380M+$123M scale in volume.

3️⃣ And the Nasdaq 9/21 set a new intraday revenue record—AI-chip risk appetite in the same time window. Product flow and risk appetite can move in the same direction, but that doesn’t mean they are cause and effect.

Filter only: Farside’s own data; no education, no guiding you to specific points. Not investment advice.

Source: Farside Investors BTC/ETH ETF Flow tables (https://farside.co.uk/btc/ , https://farside.co.uk/eth/ , read on 2026-09-22)