Small Bitcoin Traders React Swiftly to Whale Alerts

A new study from the Federal Reserve Bank of Philadelphia reveals that small Bitcoin traders react quickly to large transfers by whales. The research, catalogued as WP 26-42, analyzed data from December 2017 to December 31, 2025, covering multiple crypto market cycles. It found that smaller Bitcoin wallets increased trading activity significantly within 15 minutes of whale alerts from Whale Alert, a service that tracks large crypto transfers.

The study examined over 6,600 BTC transactions and 5,000 ETH transactions, defining whales as wallets making transfers above $50 million. Exchanges and smart contracts were excluded to focus on individual large holders. The key finding was that small and medium Bitcoin wallets increased their buy participation by 14.81 to 23.72 percentage points after whale buy signals, while sell participation rose by 12.95 to 29.52 percentage points after whale sell alerts. These results were statistically significant at the 1% level.

In contrast, Ethereum traders showed little reaction to whale alerts. The largest non-whale sellers in ETH shifted participation by just 0.76 percentage points. Bitcoin volatility spiked briefly after alerts, particularly following Wrapped Bitcoin (WBTC) alerts, while Ethereum volatility remained stable. The researchers suggest that Bitcoin's simpler transaction structure makes it easier to interpret large transfers as meaningful signals compared to Ethereum's more complex activity.

The study notes that the effect of whale alerts on trading activity decayed within an hour. However, it does not claim that traders acted because of the alerts or assess whether following whales was profitable. The paper leaves open questions about whether alerts drive trades and whether smaller wallets benefit from mimicking whale behavior.