Coinbase CEO Brian Armstrong has adopted a 10b5-1 trading plan to sell up to $1.31 billion worth of Coinbase shares at the Oct. 29 close, potentially disposing of as many as 8.17 million shares through October 2027. Sales under the pre-set schedule will only execute if specified price thresholds are met during the window. The move is a standard insider liquidity mechanism that removes discretionary timing from any future stock sales.