July 1, 2026 · Form 4 insider transaction
ARCH Venture Fund IX, L.P. bought 16,000 shares of Boundless Bio, Inc. at $1.03 per share, a transaction worth $16.5K. The trade was recorded as option exercise and disclosed on an SEC Form 4, filed 5 days after the transaction.
Represents a cashless stock option exercise by Kristina Burow. The net proceeds of such exercise were remitted to ARCH Venture Fund IX, L.P. (ARCH IX), ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage), and ARCH Venture Fund X, L.P. (AVF X Overage LP). The stock option was granted to Kristina Burow in connection with her service on the board of directors of the Issuer.