US Spot Bitcoin ETFs Log $2.26 Billion Inflows Over Six Days, Assets Near $100 Billion

US spot Bitcoin exchange‑traded funds (ETFs) recorded a six‑day inflow streak, adding $337.6 million on Monday and bringing the cumulative net inflow to roughly $2.26 billion. The surge positions the funds for their strongest month of 2026, with total inflows in August estimated at $2.72 billion.

Key inflow drivers

BlackRock’s iShares Bitcoin Trust (IBIT) dominated the week, attracting about $1.33 billion last week and an additional $208.9 million on Monday, accounting for roughly 62 % of daily inflows. Fidelity’s FBTC contributed about $104.6 million.

Trading activity spikes

CheckOnChain data shows US spot Bitcoin ETFs generated $22.1 billion in turnover last week, more than triple the $6.9 billion traded the prior week. Monday’s trading volume added $5.36 billion.

Options market activity

Call‑option volume on IBIT reached a record 1.58 million contracts on Wednesday, with daily volumes staying above 1 million contracts through Friday. Call skew rose 0.05 points, marking the largest three‑day increase in at least two years.

Asset growth

Total assets in US spot Bitcoin ETFs rose to $98.56 billion, about $1.44 billion shy of the $100 billion milestone. The asset base grew by nearly $22 billion over six trading sessions, driven largely by the appreciation of Bitcoin holdings as the price moved from the low‑$60,000 range to above $80,000.

Outlook

Another $1.44 billion in inflows would restore the category to the $100 billion threshold. The combination of strong inflows, heightened turnover, and record options activity suggests broader market participation beyond simple fund purchases.