Karla Barker 
Bitcoin exchange-traded funds ended August with buyers back in control. On the last trading day of the month, spot bitcoin ETFs saw $216.70 million in net inflows. That reversed Friday’s $202 million outflow and pushed combined assets to $99.61 billion, just short of a symbolic milestone.
BlackRock’s IBIT recorded the day’s largest inflow at $205.91 million. Grayscale’s Bitcoin Mini Trust added $9.24 million. Fidelity’s FBTC picked up $6.88 million, while Bitwise’s BITB and Morgan Stanley’s MSBT contributed smaller amounts. VanEck’s HODL was the outlier, posting the only notable outflow at $13.41 million.
For the month, spot bitcoin funds pulled in roughly $3.52 billion. That was their strongest monthly intake since October 2025. Bitcoin itself rose about 25% in August, marking its first positive August in four years. The rally likely helped ETF performance and attracted fresh demand.
Ether ETFs carried an 11-day inflow streak into the final session. They added $87.68 million, led once again by BlackRock. ETHA brought in $59.94 million, and Grayscale’s Ether Mini Trust added $13.50 million. Fidelity, Bitwise, and 21Shares saw smaller but positive flows. Ether ETF net assets closed at $15.61 billion, with daily trading volume around $742 million.
Altcoin ETF Flows Are Closing the Gap
The more interesting story may be the narrowing gap between XRP and Solana funds.
XRP ETFs added $5.64 million on Friday. Canary’s XRPC led with $4.71 million, and Bitwise’s XRP fund brought in about $930,000. Net assets for the group ended at $1.45 billion.
Solana ETFs saw more modest inflows of $925,010, mostly through Fidelity’s FSOL. Yet their total net assets came in at $1.44 billion, nearly matching XRP’s level. This is striking when you look at cumulative flows. XRP ETFs have taken in roughly $1.67 billion since launch. Solana ETFs have seen only $1.34 billion. AUM, however, reflects what the holdings are worth now, not just what investors contributed. Solana’s roughly 46% gain in August lifted the value of existing positions. Many Solana funds also earn staking rewards, which can support net asset value over time.
HYPE ETFs, meanwhile, saw no net flows for the day despite $14.72 million in trading volume. Their combined assets closed at $461.54 million.
BlackRock Still Sets the Pace
BlackRock again drove the largest flows on the final day of August. That much is clear from the numbers. What stands out is how far institutional demand has spread beyond bitcoin. Ether continues to hold a steady streak, and altcoin ETF markets are starting to attract consistent, if smaller, activity.
September begins with bitcoin ETF assets close to $100 billion and ether funds comfortably above $15 billion. The exact path from here is uncertain, but the latest monthly figures suggest institutional interest did not cool over the summer.