X0508 4 2026-02-26 0001418819 Iridium Communications Inc. IRDM 0001178032 DESCH MATTHEW J C/O IRIDIUM COMMUNICATIONS INC. 1750 TYSONS BOULEVARD, SUITE 1400 MCLEAN VA 22102 1 1 0 0 CHIEF EXECUTIVE OFFICER 0 Common Stock 2026-02-26 4 A 0 19396 0 A 1134480 D Common Stock 2026-02-26 4 A 0 95893 0 A 1230373 D Common Stock 2026-03-01 4 A 0 292275 0 A 1522648 D Common Stock 2026-03-01 4 F 0 53301 22.49 D 1469347 D Reflects the number of restricted stock units ("RSUs") certified as earned with respect to an award under the issuer's 2025 bonus plan granted on March 1, 2025. Each RSU represents a contingent right to receive one share of common stock of the issuer. The shares will vest on March 9, 2026, subject to the reporting person's continuous service with the issuer as of the vesting date. Reflects the number of shares certified as earned with respect to an award of performance-based RSUs ("PSUs") granted on March 1, 2024. One half of the PSUs settled on March 1, 2026 and the remaining PSUs will vest and be settled on March 1, 2027. These shares are represented by RSUs. Each RSU represents a contingent right to receive one share of common stock of the issuer. Of the shares underlying this RSU award, 20% shall vest on March 1, 2027 and the remainder shall vest in equal quarterly installments thereafter on each June 1, September 1, December 1 and March 1, so that all shares of common stock shall be vested as of March 1, 2031, subject to the reporting person's continuous service with the issuer as of each such vesting date. The transaction reported represents the withholding of shares by the issuer to satisfy the reporting person's tax withholding obligations. /s/ Peter L. Trentman, Attorney-in-Fact 2026-03-02