Form 4 Filing for Adaptive Biotechnologies Corp

On October 6, 2026, Julie Rubinstein, President and COO of Adaptive Biotechnologies Corp, acquired 11,881 shares of common stock at $12.14 per share. On the same day, she disposed of various amounts of common stock in multiple transactions, with prices ranging from $26.89 to $30.53. Specifically, 9,381 shares were sold at a weighted average of $27.36, 1,100 shares at $28.21, 901 shares at $29.71, and 499 shares at $30.53. These transactions were executed under a Rule 10b5-1 trading plan. Rubinstein also acquired and disposed of common stock on October 7 and 8, 2026, consistent with the trading plan. On October 7, she acquired 11,881 shares at $12.14 and disposed of 11,881 shares at a weighted average of $26.40. On October 8, she acquired another 11,881 shares at $12.14 and disposed of 11,881 shares at a weighted average of $25.66. The filing also notes the exercise of stock options, with 11,881 options exercised on each of October 6, 7, and 8, 2026, at an exercise price of $12.14 per share.