Ethereum vs. Bitcoin: Is ETH’s 5% Q3 rally the start of a structural rotation?

Ethereum [$ETH] has historically struggled to sustain its outperformance against Bitcoin.

On the technical front, $ETH/$BTC last posted a strong quarterly rally in Q3 2025, surging 53%, marking its biggest quarterly gain since Q2 2021. However, sellers erased 50% of those gains as the rally lost momentum. This suggests the rotation was temporary, as capital continued to flow into Bitcoin.

Against this backdrop, the ratio’s 5% rally so far in Q3 appears too early to confirm a sustained rotation from Bitcoin into Ethereum. At the same time, Bitcoin dominance is once again pushing toward the key 60% resistance level, gaining 1.5% in July and signaling that capital may already be rotating back into Bitcoin.

That said, Eric Trump’s recent post on X points in the opposite direction, supporting Ethereum’s rally.

Meanwhile, the on-chain data tells a similar story. Ethereum’s outperformance against Bitcoin [$BTC] isn’t happening in isolation. Institutional positioning continues to back the move, with Ethereum ETFs attracting over $128 million in net inflows so far this month, outperforming Bitcoin. Meanwhile, Ethereum’s DATs are recovering, adding further support to Ethereum’s recent strength.

With that said, it may be too early to write off the current $ETH/$BTC uptrend as just another short-term rotation. The bigger question is whether smart money is positioning ahead of a structural shift that the broader market has yet to price in.

Ethereum’s latest catalyst puts the $ETH/$BTC ratio in the spotlight

A key catalyst may be reinforcing the institutional rotation into Ethereum.

Tom Lee pointed to Robinhood’s recently unveiled Layer 2 chain as a major differentiator, calling it a breakout product that has already generated more volume than many established DEXs. More importantly, the network uses $ETH as its native gas token, and settles on Ethereum Layer 1. As activity on the chain grows, each transaction feeds back into Ethereum’s ecosystem, strengthening the long-term demand case for $ETH.

The on-chain data backs this up. As the chart below shows, the amount of $ETH bridged from Ethereum Layer 1 to the Robinhood Chain has jumped nearly 10x over the past week, surpassing $100 million. That suggests users are actively moving liquidity into Robinhood’s Layer 2 ecosystem, with $ETH emerging as the network’s core asset for gas, settlement, and on-chain activity.

In this context, Ethereum’s outperformance against Bitcoin may be more than just another rotation.

Instead, the move looks increasingly driven by improving fundamentals, as institutional inflows, growing Layer 2 activity, and rising on-chain demand continue to strengthen Ethereum’s long-term investment case. If that trend holds, the $ETH/$BTC breakout could be the first sign of a broader capital rotation into Ethereum through Q3.

Final Summary

• Ethereum’s rally against Bitcoin is backed by ETF inflows, stronger on-chain activity, and Robinhood’s Layer 2 ecosystem.
• If these trends continue, the $ETH/$BTC breakout could signal a broader shift of capital into Ethereum in Q3.