Form 4 Filing for Boundless Bio, Inc.

This filing details a transaction by TANG CAPITAL MANAGEMENT LLC and TANG KEVIN, who are ten percent owners of Boundless Bio, Inc. (BOLD). On August 26, 2026, they disposed of 18,300 shares of Common Stock at a weighted-average price of $2.97 per share, with transactions ranging from $2.90 to $3.03. The total profit of $10,046.70 has been disgorged. Following this transaction, the reporting persons collectively own 2,840,635 shares. The filing includes detailed information about the various entities and individuals holding beneficial ownership, as outlined in Footnote 3.