US Spot Bitcoin ETFs Experience Significant Inflows as Bitcoin Surpasses $81,000

On September 18, US spot Bitcoin ETFs marked a significant recovery by attracting $433 million in a single session, reversing a week of substantial outflows and pushing Bitcoin's price above $81,000. The net weekly inflow for these ETFs reached approximately $6.2 million, despite earlier losses.

The week began with a stark decline, as investors withdrew $450.4 million from spot Bitcoin ETFs on September 15, followed by an additional $296 million the next day. However, Fidelity's FBTC and BlackRock's IBIT led the charge on September 18, with FBTC absorbing around $310.7 million and IBIT drawing in about $108.4 million.

This influx of capital coincided with a rally in Bitcoin's price, which reached intraday highs near or above $82,000 between September 19 and 21. The market sentiment shifted positively, aided by short-covering activity from traders who had previously bet against Bitcoin.

Despite the recent inflows, the overall net weekly inflow of $6.2 million is modest compared to the peak of $1.92 billion recorded in late August. Since their inception in January 2024, US spot Bitcoin ETFs have accumulated around $55.1 billion in cumulative net inflows, with total net assets now estimated between $102.5 billion and $103 billion.

The competitive landscape among ETF issuers is evolving, with Fidelity's FBTC increasingly capturing market share during volatile periods. The significant inflows on September 18 highlight the direct relationship between ETF capital inflows and Bitcoin's price movements, as these funds must purchase actual Bitcoin to back their shares.

Traders are now closely monitoring the $80,000 price level, which has become a critical support point. A sustained drop below this threshold, particularly amid heavy ETF outflows, could pose challenges to Bitcoin's current bullish sentiment.

New Developments in Bitcoin Market

As of September 20, 2026, Bitcoin closed at $81,159, marking its first weekly close above the 50-week moving average since November 2025.

This significant move comes after a 6% surge on September 18, which saw Bitcoin briefly exceed $81,200, driven by increased whale activity and short liquidations.

Bitcoin has recovered approximately 39% from its cycle low of around $58,525 on June 30, 2026, which represented a 53% drawdown from its peak above $124,000 in October 2025.

Historically, when Bitcoin reclaims the 50-week moving average after a bear-market breakdown, it has not resulted in new cycle lows in 11 out of 13 comparable instances tracked by Galaxy Research's Alex Thorn.

The key question now is whether Bitcoin can maintain its position above the 50-week moving average of $78,788 in the coming weeks.

New Developments in Bitcoin Market

Bitcoin has surged above $80,000, reaching approximately $82,000 at the latest report. This increase follows a significant $148 billion cash build in the US Treasury General Account, which did not destabilize the overnight funding markets.

The Treasury's cash balance rose to $991.708 billion, while deposits held by commercial banks at the Federal Reserve decreased by $114.971 billion, tightening the available reserves in the financial system.

Despite the Fed's recent interest rate hike to a range of 3.75% to 4%, the strain on funding conditions remained contained. The Secured Overnight Financing Rate (SOFR) was recorded at 3.85%, indicating that the market has absorbed the liquidity shock without significant disruption.

Bitcoin's recovery from a prior dip to around $76,147 has been supported by renewed inflows into spot Bitcoin exchange-traded funds (ETFs) and a rally in technology stocks, alongside a weakening yen.

Market dynamics suggest that the liquidity risk associated with the Treasury transfer did not create additional demand for Bitcoin, but rather that the market has stabilized, allowing for potential further recovery.

Recent Developments in Bitcoin Market

• Bitcoin (BTC) briefly crossed $84,000 on September 21, marking its first visit to that level since January 31.
• This surge liquidated $262.30 million in short positions within a single hour, according to CoinGlass.
• At the time of writing, Bitcoin was trading at $83,869, reflecting a daily gain of 3.18%.
• In total, liquidations across the crypto market reached $271.83 million in that hour, with long positions contributing only $9.53 million.
• Over a 12-hour period, liquidations totaled $433.67 million, and over 24 hours, they reached $599.15 million, affecting 127,304 traders.
• The largest single liquidation order was a Binance Bitcoin perpetual worth $11.29 million.
• Other cryptocurrencies also saw gains, with XRP rising 7.04% and Solana gaining 6.67% within 24 hours.
• Zcash (ZEC) led the top 10 cryptocurrencies with a 33.50% weekly gain.
• Bitcoin's recent performance included its first weekly close above a 50-week moving average in 45 weeks, ending the week of September 20 at $81,159.
• Analyst Alex Thorn from Galaxy suggests this close indicates that the bear market low may be behind us.