X0609 4 2026-08-20 0001504008 BankUnited, Inc. BKU 0001591838 Mackey James G. false C/O BANKUNITED, INC. 14817 OAK LANE MIAMI LAKES FL 33016 1 Chief Financial Officer 0 Common Stock, par value $0.01 2026-08-20 4 M 0 8937 0 A 8937 D Common Stock, par value $0.01 2026-08-20 4 F 0 3517 46.83 D 5420 D Restricted Share Unit 2026-08-20 4 M 0 8937 0 D Common Stock, par value $0.01 per share 8937 26731 D Shares of BankUnited, Inc. common stock withheld by the Issuer to satisfy the tax withholding obligation of the reporting person arising from the vesting of restricted shares on August 20, 2026. These shares were not sold by the reporting person but were instead withheld from the total number of vested shares received by the reporting person from the Issuer. Each restricted share unit represents the right to receive, at settlement, one share of common stock or cash in an amount equal to the fair market value of one share of common stock. Issued pursuant to the terms of the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan. 8,937 units vested on August 20, 2026, 8,936 units will vest on August 20, 2027, and 8,937 will vest on August 20, 2028. /s/ Jacqueline Bravo, as Attorney-in-Fact 2026-08-21