Fidelity's FBTC Leads $433M Net Inflow Into US Bitcoin (BTC) ETFs

Fidelity's FBTC Steers a $433M Inflow Day

US spot Bitcoin exchange-traded funds absorbed a net $433 million on Thursday, September 18, a second consecutive day of positive flows in which not a single product in the lineup posted an outflow. Fidelity's FBTC did the heavy lifting with $310.7 million of net creations, the largest single-fund intake by a wide margin, while BlackRock's IBIT added $108.4 million. The remainder was spread thinly: Bitwise's BITB took in $9.7 million, VanEck's HODL $2.3 million, and the ARK Invest and 21Shares vehicle ARKB $1.9 million.

The clean sweep is as telling as the headline figure. In several recent sessions, buying into the biggest funds has been partly cancelled by outflows elsewhere in the lineup; on the 18th, the daily flow table shows no red cells at all — every fund that recorded activity took money in, while the rest, including Grayscale's GBTC, Morgan Stanley's MSBT, Franklin Templeton's EZBC and Invesco Galaxy's BTCO, reported no flows. The mechanics explain why that matters: in a spot Bitcoin ETF, authorized participants deliver cash to the issuer in exchange for newly created shares, and the issuer buys bitcoin at spot to back them. A $433 million net inflow therefore represents roughly that much fresh, direct spot-market demand delivered through the primary market rather than the order book. Daily figures are compiled from the issuers' own disclosures, and the two-day streak — September 17 and 18 both positive — is the kind of back-to-back accumulation that flow watchers read as confirmation rather than a one-off allocation. For a complex whose daily prints can swing by hundreds of millions in either direction, a zero-outflow session is rare enough to count as its own signal.

COINOTAG Composite: $81,911 Ceiling Rated 80/100

Zoom out, and the week's flows are far less one-directional than Thursday's print suggests. Across the most recent five trading days the complex added just $6.1 million net — essentially flat — because the underlying rotations cut both ways: FBTC gained $79.9 million and IBIT $120.6 million over that span, while ARKB shed $141.9 million and GBTC another $62.3 million, with BITB and HODL also marginally negative. Capital is not leaving the asset class so much as migrating between vehicles, consolidating toward the two largest and lowest-cost funds — a pattern consistent with large institutional allocations favoring scale and tight spreads over fee-heavy legacy wrappers.

The monthly arithmetic sharpens the picture. September's net inflows through the 18th stand at $313.4 million, a fraction of August's $3.539 billion — one of the complex's strongest monthly hauls of the year — which implies the first half of the month ran net-negative and that the last two sessions alone swung September positive, with Thursday's $433 million exceeding the entire month's running total. The lifetime ledger tells a rotation story of its own: since the funds began trading in January 2024, cumulative net inflows reach $55.23 billion, with BlackRock's IBIT gathering $64.12 billion while Grayscale's GBTC, the converted trust carrying the highest fee in the Bitcoin fund complex, has surrendered $27.80 billion. When two funds capture more than 96% of a session's intake, breadth is thin even when the direction is clean — and flow momentum of this kind remains sensitive to macro catalysts, with our earlier read on the Trump-Xi tariff-truce agenda mapping the calendar risk into next week. Readers tracking the market in real time can follow live spot and futures prices on Gate.

As of this writing, Bitcoin trades at $81,136, up 4.65% over 24 hours. COINOTAG's proprietary 42-indicator composite S/R scoring engine rates the $81,911 resistance at 80/100 (STRONG), a confluence of Keltner Upper, Fibo 0.000 and Donchian Upper, while the nearest support at $79,517 scores 76/100 on Pivot Point, ATR Lower and LVN sources. Positioning is mildly long-biased — funding at +0.0068%, open interest of $16.9 billion and a 1.07 long/short account ratio — alongside a Fear & Greed reading of 71 (Greed) and RSI at 64; our MACD signal stays bearish against the uptrend. Flow and price point the same way across the window: a hold above $79,517 keeps the breakout case toward $87,861 alive, while losing that level invalidates it. Recent perpetual liquidation data already showed shorts absorbing pressure.