X0508 4 2026-02-24 0 0001428205 Armour Residential REIT, Inc. ARR 0001469064 ULM SCOTT 3001 OCEAN DRIVE SUITE #201 VERO BEACH FL 32963 1 1 0 0 CEO 0 Common Stock, par value $0.001 per share 2026-02-24 4 M 0 3380 0 A 76182 D Common Stock, par value $0.001 per share 2026-02-24 4 F 0 1352 17.89 D 74830 D Phantom Stock 2026-02-24 4 M 0 3380 0 D Common Stock 3380 36870 D On February 24, 2026, the reporting person elected to convert 2,028 of the 3,380 shares of vested phantom stock into 2,028 shares of ARMOUR common stock. The reporting person elected to convert the remaining 1,352 shares of vested phantom stock into cash solely to pay income taxes on the vested stock. The 3,380 shares are part of, and relate to phantom stock vesting over a six-and-a-half year period, which was reported on a Form 4 report filed by the reporting person on January 14, 2021 and phantom stock vesting over a seven-year period, which was reported on a Form 4 report filed by the reporting person on February 16, 2023. Each unit of phantom stock is the economic equivalent of one share of ARMOUR common stock. /s/ Scott J. Ulm 2026-02-26