Spot Bitcoin ETFs See $999M One-Day Inflow, 9th Biggest Since January 2024 Debut

Spot Bitcoin ETFs attracted $999 million in net inflows in Monday's session, marking their largest one-day intake since October 2025 and the 9th biggest daily total since trading began in January 2024, according to Kobeissi Letter. Bitcoin was last trading around $86,128, up 0.44% over the past 24 hours. Market capitalization stood near $1.73 trillion, with 24-hour volume of $45.96 billion. Flows accelerating into the week Monday's surge followed $433 million of inflows on Friday, taking the two-session total to $1.432 billion. The rapid back-to-back accumulation ranks among the strongest stretches of institutional re-engagement since spot Bitcoin ETFs launched, reinforcing that demand was broad-based rather than a one-off print. IBIT shows a V-shaped rebound BlackRock's IBIT, the category leader by assets under management, offers a clearer view of the underlying positioning. In the August 3 to September 19, 2026 window, IBIT logged a peak single-day inflow of $474 million on August 19 and another high of $430 million on September 4. Mid-September then turned sharply negative, with consecutive outflows of $168 million and $145 million, the deepest sustained outflow stretch in the tracked period. The reversal was swift: flows rebounded to $102 million and then jumped to $381 million on September 19, forming a V-shaped recovery that set the stage for Monday's $999 million total across all spot Bitcoin ETF products. The speed of the swing from -$145 million to +$381 million in sequential sessions points to dip-buying accumulation rather than a durable institutional exit. Historically, sustained daily inflows above $200 million have often preceded Bitcoin price breakouts, making that level a key near-term threshold. Why the October 2025 reference matters The October 2025 comparison is notable because it coincided with a major upward leg in Bitcoin. Monday's $999 million print, the largest since that period, suggests allocators are returning with conviction rather than cautiously probing. In a broader institutional backdrop, gold ETFs recently absorbed 27.1 tonnes in a single week, their 3rd largest inflow since January, highlighting simultaneous demand for hard-asset exposure. Spot Bitcoin ETF inflows also align with a wider rotation that has pushed total crypto market capitalization back above $3 trillion. What to watch next Whether Monday represents the start of a sustained inflow streak or a single-session spike will be determined by upcoming daily flow data. The key line remains $200 million per day. Holding above that level across multiple sessions would shift Monday's move from notable to market-moving. FAQ - What was the total spot Bitcoin ETF inflow on Monday, September 22, 2026? $999 million, the largest daily inflow since October 2025 and the 9th biggest since January 2024. - How does Monday's $999 million rank historically? 9th largest single-day inflow since spot Bitcoin ETFs began trading in January 2024, based on more than 20 months of daily data. Combined with Friday's $433 million, the two-session total was $1.432 billion. - What did BlackRock's IBIT flows look like heading into the spike? A V-shaped recovery: after mid-September outflows of $168 million and $145 million, IBIT rebounded to $381 million on September 19. - What daily inflow level matters most for sustained price impact? $200 million per day; sustained readings above that level have historically preceded Bitcoin breakouts. Source: Kobeissi Letter. Published by CoinsProbe Markets Desk.