X0609 4 2026-05-07 0001401521 AMERICAN COASTAL INSURANCE Corp ACIC 0002009629 Castle Svetlana false 570 CARILLON PARKWAY, SUITE 100 SAINT PETERSBURG FL 33716 false true false false Chief Financial Officer false Common Stock 2026-05-07 4 M false 8826 0.00 A 19922 D Common Stock 2026-05-07 4 F false 3532 10.85 D 16390 D Restricted Stock Units 2026-05-07 4 M false 2069 0.00 D Common Stock 2069 6349 D Performance Stock Units 2026-05-07 4 M false 4138 0.00 D Common Stock 4138 12695 D Dividend Equivalent Units 2026-05-07 4 M false 137 11.31 D Common Stock 137 427 D Dividend Equivalent Units 2026-05-07 4 M false 275 11.31 D Common Stock 275 853 D Each stock unit represents a conditional right to receive one share of the company's common stock. The restricted stock units are subject to vesting over three years with one third, rounded down to the nearest whole share of stock, vesting in each period. The performance units are subject to vesting over three years with one third, rounded down to the nearest whole share of stock, vesting in each period. The number of shares of common stock that will be delivered for each performance stock unit depends on the achievement of certain performance factors. Depending on actual performance, the number of shares of common stock delivered upon the vesting date (based on the terms outlined in the respective award agreement) can range from 0% to 150% of the number presented above. The dividend equivalent units will vest proportionately with the underlying restricted stock units to which they relate. The dividend equivalent units will vest proportionately with the underlying performance stock units to which they relate. /s/ Alexander Baty, Attorney-in-Fact for Svetlana Castle 2026-05-11