Bitcoin spot ETFs hemorrhaged $64.8 million on June 15, dragged down almost entirely by one familiar culprit. Grayscale’s GBTC, the fund that has been leaking assets since the day it converted from a trust, shed $124 million in a single session.

Meanwhile, the altcoin side of the ETF aisle told a completely different story. Ethereum spot ETFs pulled in $22.5 million, Solana products added $2.7 million, and XRP funds attracted $2.8 million.

The GBTC drag and Bitcoin’s outflow problem

GBTC lost $124 million, but the total Bitcoin ETF category only lost $64.8 million net. That means other Bitcoin funds actually absorbed roughly $59 million in inflows on the same day, partially offsetting Grayscale’s losses.

Altcoin ETFs are quietly building momentum

Ethereum’s $22.5 million inflow was the standout performer among the altcoin products. Ethereum ETFs launched after their Bitcoin counterparts in 2024-2025.

Solana and XRP funds posted more modest gains at $2.7 million and $2.8 million respectively. XRP spot ETFs have now accumulated cumulative inflows exceeding $1.4 billion since their launch.

There’s also been chatter about HYPE ETF products attracting capital, adding another entrant to the growing roster of altcoin funds competing for institutional dollars.

What this rotation means for investors

Bitcoin has been the dominant crypto allocation for institutional portfolios since spot ETFs launched in early 2024. Altcoin ETFs provide diversification without requiring investors to leave the familiar ETF wrapper.

XRP’s cumulative $1.4 billion in inflows since launch suggests that allocators view XRP as a legitimate portfolio holding. For Solana, the $2.7 million daily inflow is modest but meaningful as a signal, given that Solana ETFs are newer entrants to the market.

Investors watching this space should pay close attention to whether GBTC outflows stabilize or accelerate, and whether XRP’s cumulative inflow trajectory continues its upward curve past the $1.4 billion mark.