Bitcoin (BTC) ETFs Bleed $450M in Largest Outflow Since June, Led by Fidelity's FBTC

$450M Leaves Spot Bitcoin ETFs

US spot Bitcoin ETF products recorded a net outflow of $450.4 million on September 15 — the heaviest single-day withdrawal since June 24, per the flow data our desk tracks daily. Fidelity's FBTC carried the bulk of the retreat at $214.8 million, nearly half the total, with BlackRock's IBIT close behind at $161.7 million. Between them, the two flagship funds absorbed $376.5 million, or 83.6% of everything that left the complex. Grayscale's GBTC shed another $44.1 million, ARK 21Shares' ARKB saw $17.4 million exit and Bitwise's BITB lost $12.4 million, while the remaining products registered no net movement. The reversal was abrupt: one session earlier, on September 14, the same fund complex had booked a $159.9 million net inflow. The outflow also landed alongside a rough repricing across the wider Bitcoin market — the Senate failed to advance the CLARITY Act, crypto equities sold off after hours, and Bitcoin's price slipped roughly 2.5% to close near $75,700. GBTC's exit deserves separate weight: the fund has bled steadily since early 2024, so its $44.1 million day looks structural rather than event-driven, and a faster drain there would bite harder at the margin than short-term moves in FBTC or IBIT.

The wider tape explains why the recovery attempt faltered. On September 14 the funds took in $159.9 million, snapping a four-session streak that had drained $462.7 million; across the five sessions through that date, the net position still sat near $302.8 million negative. The bounce was narrow. BlackRock's IBIT drew $134.3 million and Fidelity's FBTC $53.3 million — a combined $187.6 million, more than the entire complex's net inflow — while ARK 21Shares' ARKB leaked $42 million in the opposite direction. Franklin Templeton's EZBC added $4.6 million and Morgan Stanley's MSBT $9.7 million; most other funds stood still. On-chain data shows the divergence running longer than a day: over the prior 20 sessions IBIT accumulated roughly $1.08 billion worth of Bitcoin with seven positive days, while GBTC shed about $254.7 million over the same window. Timing mattered too. The inflow landed hours before the Federal Reserve's September 15-16 meeting, and any surprise on rates or guidance could stall demand again, as our Bitcoin Braces for Fed coverage noted ahead of the decision. If outflows resume in coming sessions, September 14 will read as a pause in the selling, not a turn.

MARA Adds 1,292 BTC

While ETF investors pulled money, one listed miner leaned in. On-chain tracking flagged MARA Holdings buying 1,292 Bitcoin on September 15 through digital-asset brokerage FalconX, a print worth roughly $98.64 million at an estimated average price of about $76,347 per coin. The purchase fits MARA's established playbook: the company mines and holds, running its corporate balance sheet like a rolling strategic Bitcoin reserve rather than selling output the way much of the Bitcoin mining sector does. A near-nine-figure clip in a single transaction is whale-sized by any measure and ranks among the larger public-miner purchases this month. Sentiment into the print stayed cautious rather than euphoric: Binance perpetual funding sat only marginally positive at about 0.006% in the final settlement window before the meeting, a pairing with elevated open interest that analysts read as longs maintained without excess leverage — conviction, not froth. The Fed decision framed the risk in both directions, as our 92% Fed hike odds analysis laid out: a dovish result would underwrite existing longs, while a hawkish surprise could trigger liquidations and steepen any downside move. Readers tracking the market in real time can follow live spot and futures prices on MEXC.

$73,543 Support Carries the Thesis

COINOTAG's proprietary 42-indicator composite S/R scoring engine rates the $73,543.64 support at 86/100, driven by the confluence of the high-volume node, the S2 pivot and the 0.382 Fibonacci retracement. Nearest overhead supply sits at $76,992, scored 74/100 on Value Area High, a MACD cross and the ATR upper band. Spot printed $76,086 at last check, down 1.55% over 24 hours, with RSI at 49.26 and a bearish MACD signal inside what remains an uptrend. Derivatives add context: funding at 0.0065%, open interest of $15.27 billion and a 1.90 long/short account ratio (65.5% long), with the Fear & Greed Index neutral at 51. Hold $73,543 and reclaim $76,992, and the path opens toward $78,320; lose $73,543 and the bullish thesis is invalidated, with $70,952 (74/100) the next floor. Concentration is the real story of the period, though: FBTC and IBIT carried 83.6% of the day's outflow, so the headline $450.4 million overstates how broad the retreat actually was.