But following the big buys, both large buy and sell orders for bitcoin were placed on Coinbase right before the expiry of bitcoin’s options contract on Dec. 31. On Jan. 1, on the other hand, sell orders with more than five bitcoin dominated Coinbase’s BTC/USD trading pair volume. These large trades, however, did not cause any spikes in Coinbase’s spot market share, according to Kaiko’s Medalie, meaning that similar activity was taking place on other exchanges over the same time period.