X0609 4 2026-10-01 0 0001437958 COASTAL FINANCIAL CORP CCB 0002005790 Hamilton Brian T false 5415 EVERGREEN WAY EVERETT WA 98203 1 1 0 0 President of CCBX 1 Common Stock 2026-10-01 4 F 0 233 39.4642 D 66421 D Represents shares sold in payment of withholding taxes upon partial vesting of RSUs. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. Includes the following pursuant to the 2018 Coastal Financial Corporation Omnibus Incentive Plan: (1) 10,466 restricted stock units (RSUs) with remaining shares vesting monthly in an approximately equal amount through April 30, 2028 (2) 2,714 RSUs that vest in approximately equal installments over 4 years (3) 502 RSUs that vest in approximately equal installments over 3 years (4) 15,000 performance-based RSUs - eligible to vest on April 30, 2028, subject to continuous employment and achievement of return on equity that is at least 80% of company comparator peer group. Each RSU represents the right to receive one share of common stock upon vesting. /s/ Leilani McKernan, as Attorney-in-fact 2026-10-01