MBX Biosciences, Inc. President & CEO Stock Transactions

On October 24, 2025, P. Kent Hawryluk, President & CEO of MBX Biosciences, Inc., engaged in several stock transactions. He acquired 182,859 shares of common stock at $3.25 per share, increasing his total holdings to 664,256 shares. Additionally, he disposed of 182,859 stock options (right to buy) at $0 per share, reducing his total options to 129,708. The options were originally granted on November 7, 2022, with an exercise price of $3.25 and an expiration date of November 6, 2032. The shares held by the P. Kent Hawryluk Revocable Trust, of which he is the trustee, amount to 468,277 shares. These transactions were reported in a Form 4 filing with the SEC.