Exhibit 99.1

FOR RELEASE TUESDAY, JULY 20, 2021

IRIDIUM ANNOUNCES SECOND-QUARTER 2021 RESULTS; UPDATES 2021 OUTLOOK

MCLEAN, Va. – July 20, 2021 – Iridium Communications Inc. (Nasdaq:IRDM) (“Iridium”) today reported financial results for the second quarter of 2021 and updated its full-year 2021 outlook. Net income was $3.8 million, or $0.03 per diluted share, for the second quarter of 2021, as compared to net loss of $12.4 million, or $0.09 per diluted share, for the second quarter of 2020. This change in net income was primarily the result of growth in total revenue driven by strength in recurring service revenue. Operational EBITDA (“OEBITDA”)⁽¹⁾ for the second quarter was up 11% to $94.8 million, as compared to $85.3 million for the prior-year period, representing an OEBITDA margin⁽¹⁾ of 63%. The change in OEBITDA primarily resulted from strong service revenue.

Iridium reported second-quarter total revenue of $149.9 million, which consisted of $121.3 million of service revenue and $28.6 million of revenue related to equipment sales and engineering and support projects. Total revenue and service revenue both increased 7% versus the comparable period of 2020. Service revenue, which represents primarily recurring revenue from Iridium’s growing subscriber base, was 81% of total revenue for the second quarter of 2021.

The Company ended the quarter with 1,616,000 total billable subscribers, which compares to 1,362,000 for the year-ago period and is up from 1,518,000 for the quarter ended March 31, 2021. Total billable subscribers grew 19% year-over-year, driving growth across all service categories.

“Demand for Iridium’s services have never been better, as close to 100,000 new users joined our network in the second quarter. This revenue growth, especially in IoT and broadband, is indicative of the power of Iridium’s global partner ecosystem who embed us into innovative applications and products,” said Matt Desch, CEO, Iridium. Desch continued, “Iridium delivered strong revenue growth in the second quarter, driven by rebounds in IoT and commercial voice and data, and continued strength in broadband.”

Commenting on its full-year outlook, Desch added, “In light of our strong subscriber growth during the first half of the year, we are raising our full-year outlook for service revenue growth to between 4% and 5%. This upward revision reflects the demand we are seeing across many industries for Iridium^® solutions and bodes well for continued growth as we move into the future.”

Iridium Business Highlights

Service – Commercial

Commercial service remained the largest part of Iridium’s business, representing 64% of the Company’s total revenue during the second quarter. The Company’s commercial customer base is diverse and includes markets such as maritime, aviation, oil and gas, mining, recreation, forestry, construction, transportation and emergency services. These customers rely on Iridium’s products and services as critical to their daily operations and integral to their communications and business infrastructure.

Service – Government

Iridium’s voice and data solutions improve situational awareness for military personnel and track critical assets in tough environments around the globe, providing a unique value proposition that is not easily duplicated.

Under the Enhanced Mobile Satellite Services contract (the “EMSS Contract”), a seven-year, $738.5 million fixed-price airtime contract with the U.S. Air Force Space Command signed in September 2019, Iridium provides specified satellite airtime services, including unlimited global standard and secure voice, paging, fax, Short Burst Data^®, Iridium Burst^®, RUDICS and Distributed Tactical Communications System services for an unlimited number of Department of Defense and other federal government subscribers. Iridium also provides maintenance and support work for the U.S. government’s dedicated Iridium^® gateway under two other contracts with the U.S. Air Force Space Command. Iridium Certus airtime services are not included under these contracts and may be procured separately for an additional fee.

Equipment

Engineering & Support

Capital expenditures were $9.8 million for the second quarter, which includes $0.7 million of capitalized interest. The Company ended the second quarter with gross debt of $1.63 billion and a cash, cash equivalents and marketable securities balance of $219.4 million, for a net debt balance of $1.41 billion.

During the quarter ended June 30, 2021, the Company repurchased 1.7 million shares of its common stock under its previously announced $300 million share repurchase program at a total purchase price of $63.2 million. As of June 30, 2021, $177.6 million remained available and authorized for repurchase under this program.

2021 Outlook

The Company updated its full-year 2021 outlook for total service revenue and currently anticipates:

(1) Non-GAAP Financial Measures & Definitions

In addition to disclosing financial results that are determined in accordance with U.S. GAAP, the Company provides Operational EBITDA and Operational EBITDA margin, which are non-GAAP financial measures, as supplemental measures to help investors evaluate the Company’s fundamental operational performance. Operational EBITDA represents earnings before interest, income taxes, depreciation and amortization, share-based compensation expenses and, for periods presented through the first quarter of 2020 only, certain expenses associated with the construction of the Company’s Iridium NEXT satellite constellation, primarily in-orbit insurance. The Company considers the loss on early extinguishment of debt to be financing-related costs associated with interest expense or amortization of financing fees, which by definition are excluded from Operational EBITDA. Such charges are incidental to, but not reflective of, the Company’s day-to-day operating performance. The Company also presents Operational EBITDA expressed as a percentage of GAAP revenue, or Operational EBITDA margin. Operational EBITDA, along with its related measure, Operational EBITDA margin, does not represent, and should not be considered, an alternative to U.S. GAAP measurements such as net income or loss. In addition, there is no standardized measurement of Operational EBITDA, and the Company’s calculations thereof may not be comparable to similarly titled measures reported by other companies. The Company believes Operational EBITDA is a useful measure across time in evaluating its fundamental core operating performance. Management also uses Operational EBITDA to manage the business, including in preparing its annual operating budget, debt covenant compliance, financial projections and compensation plans. The Company believes that Operational EBITDA is also useful to investors because similar measures are frequently used by securities analysts, investors and other interested parties in their evaluation of companies in similar industries. As indicated, Operational EBITDA does not include interest expense on borrowed money, the payment of income taxes, amortization of the Company’s definite-lived intangible assets, or depreciation expense on the Company’s capital assets, which are necessary elements of the Company’s operations. Since Operational EBITDA does not account for these and other expenses, its utility as a measure of the Company’s operating performance has material limitations. Due to these limitations, the Company’s management does not view Operational EBITDA in isolation, but also uses other measurements, such as net income (loss), revenues and operating profit, to measure operating performance. Please refer to the schedule below for a reconciliation of consolidated GAAP net income (loss) to Operational EBITDA and Iridium’s Investor Relations webpage at www.iridium.com for a discussion and reconciliation of this and other non-GAAP financial measures. We do not provide a forward-looking reconciliation of expected full-year 2021 Operational EBITDA guidance as the amount and significance of special items required to develop meaningful comparable GAAP financial measures cannot be estimated at this time without unreasonable efforts.

Iridium Communications Inc.

Supplemental Reconciliation of GAAP Net Loss to Operational EBITDA

(In thousands)

Conference Call Information

As previously announced, the Company will host a conference call to discuss its results at 8:30 a.m. Eastern Time on Tuesday, July 20, 2021. Callers should dial 1-412-902-6740 to access the call. The conference call will also be simultaneously webcast on Iridium’s Investor Relations webpage at www.iridium.com. An archive of the webcast will be available following the live conference call.

About Iridium Communications Inc.

Iridium^® is the only mobile voice and data satellite communications network that spans the entire globe. Iridium enables connections between people, organizations and assets to and from anywhere, in real time. Together with its ecosystem of partner companies, Iridium delivers an innovative and rich portfolio of reliable solutions for markets that require truly global communications. In 2019, the company completed a generational upgrade of its satellite network and launched its new specialty broadband service, Iridium Certus. Iridium Communications Inc. is headquartered in McLean, Va., U.S.A., and its common stock trades on the Nasdaq Global Select Market under the ticker symbol IRDM. For more information about Iridium products, services and partner solutions, visit www.iridium.com.

Forward-Looking Statements

Statements in this press release that are not purely historical facts may constitute forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking

statements include statements regarding Iridium’s expectations with respect to total service revenue growth, OEBITDA and cash taxes for 2021; cash taxes and net leverage over the longer-term, and expected revenues from its EMSS contract with the U.S. government. Forward-looking statements can be identified by the words “anticipates,” “may,” “can,” “believes,” “expects,” “projects,” “intends,” “likely,” “will,” “to be” and other expressions that are predictions or indicate future events, trends or prospects. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of Iridium to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, uncertainties regarding customer demand for Iridium’s products and services, including demand from the U.S. government; Iridium’s ability to maintain the health, capacity and content of its satellite constellation, and the development of and market for Iridium’s products and services, as well as general industry and economic conditions, and competitive, legal, governmental and technological factors. Other factors that could cause actual results to differ materially from those indicated by the forward-looking statements include those factors listed under the caption “Risk Factors” in the Company’s Form 10-K for the year ended December 31, 2020, filed with the Securities and Exchange Commission (“SEC”) on February 11, 2021, and the Company’s Form 10-Q for the quarter ended June 30, 2021, filed with the SEC on July 20, 2021, as well as other filings Iridium makes with the SEC from time to time. There is no assurance that Iridium’s expectations will be realized. If one or more of these risks or uncertainties materialize, or if Iridium’s underlying assumptions prove incorrect, actual results may vary materially from those expected, estimated or projected. Iridium’s forward-looking statements are based on information available to it as of the date of this press release and speak only as of the date of this press release, and Iridium undertakes no obligation to update forward-looking statements.

Iridium Communications Inc.

Condensed Consolidated Statements of Operations

(In thousands)

Iridium Communications Inc.

Subscriber Highlights

(In thousands, except ARPU)