X0609 4 2026-08-21 0 0001428205 Armour Residential REIT, Inc. ARR 0001698344 Harper Gordon false 3001 OCEAN DRIVE SUITE 201 VERO BEACH FL 32963 0 1 0 0 CFO 0 Common Stock, par value $0.001 per share 2026-08-21 4 M 0 7750 0 A 37066 D Common Stock, par value $0.001 per share 2026-08-21 4 F 0 2794 16.32 D 34272 D Phantom Stock 2026-08-21 4 M 0 7750 0 D Common Stock 7750 121850 D On August 21, 2026, the reporting person elected to convert 4,956 of the 7,750 shares of vested phantom stock into 4,956 shares of ARMOUR common stock. The reporting person elected to convert the remaining 2,794 shares of vested phantom stock into cash solely to pay income taxes on the vested stock. The 7,750 shares are part of, and relate to phantom stock vesting over a six year period, which was reported on a Form 4 report filed by the reporting person on January 14, 2021, 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 February 16, 2023, phantom stock vesting over a three year period which was reported on a Form 4 report filed by the reporting person on May 16, 2024 and phantom stock vesting over a five-year period, which was reported on Form 4 reports filed by the reporting person on April 30, 2025 and June 18, 2026. Each unit of phantom stock is the economic equivalent of one share of ARMOUR common stock. /s/ Gordon Harper 2026-08-25