Vanguard Portfolio Management increases stake in Iridium (IRDM) to 5.81%

Rhea-AI Filing Summary

Iridium Communications Inc reported that Vanguard Portfolio Management beneficially owned 6,103,943 shares of common stock, equal to 5.81% of the class as of 03/31/2026. The filing shows Vanguard has sole dispositive power over 6,103,943 shares and sole voting power for 12,194 shares. The disclosure states these holdings include securities held for Vanguard funds and managed accounts, and that no other single person holds more than 5% of the class. The form is signed by Vanguard's Head of Global Fund Administration on 04/29/2026.

Insights

Institutional Ownership Analyst

Vanguard reports a 5.81% stake, a routine institutional disclosure.

Vanguard Portfolio Management reports beneficial ownership of 6,103,943 shares representing 5.81% as of 03/31/2026. The filing clarifies dispositive authority resides with Vanguard entities and includes holdings across Vanguard funds and managed accounts.

Institutional holdings at this scale are common; subsequent filings may show whether holdings change materially. Cash‑flow treatment and specific fund allocations are not detailed in the excerpt.

Corporate Governance Specialist

This Schedule 13G signals passive reporting, not active control.

The form is a Schedule 13G-style disclosure listing beneficial ownership above the 5% threshold, consistent with passive investment reporting. Voting power is largely delegated: 12,194 shares with sole voting power versus dispositive power over 6,103,943 shares.

Because the filing states holdings include Vanguard funds and managed accounts, changes in fund flows or rebalances could alter future ownership; governance influence depends on subsequent voting patterns disclosed elsewhere.

Key Figures

Beneficial ownership: 6,103,943 shares Percent of class: 5.81% Sole voting power: 12,194 shares +1 more

4 metrics

Beneficial ownership 6,103,943 shares as of 03/31/2026

Percent of class 5.81% percentage of common stock class

Sole voting power 12,194 shares voting power reported by Vanguard

Sole dispositive power 6,103,943 shares power to direct disposition

Key Terms

Schedule 13G, beneficially owned, sole dispositive power, Investment Company Act

4 terms

Schedule 13G regulatory

"This Schedule 13G reports beneficial ownership above 5% of the class"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Amount beneficially owned: 6103943 (b) Percent of class: 5.81 %"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 6103943"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Investment Company Act regulatory

"investment company registered under the Investment Company Act of 1940"

The Investment Company Act is a law that sets rules for businesses whose main activity is managing and selling pooled money, such as mutual funds and other investment funds. It matters to investors because it requires clear reporting, limits managers from putting their own interests ahead of clients, and mandates safekeeping and oversight of assets—similar to safety inspections and traffic rules that help keep shared vehicles reliable and trustworthy.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Iridium Communications Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

46269C102

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 46269C102

1

Names of Reporting Persons

Vanguard Portfolio Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 12,194.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 6,103,943.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,103,943.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.81 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Portfolio Management LLC and the following affiliates of Vanguard Portfolio Management LLC or business divisions of such affiliates: Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Portfolio Management LLC, or business divisions of such subsidiaries whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Iridium Communications Inc
(b)	Address of issuer's principal executive offices: 1750 Tysons Blvd, Suite 1400, Mc Lean, VA, 22102
Item 2.
(a)	Name of person filing: Vanguard Portfolio Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 46269C102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 6103943
(b)	Percent of class: 5.81 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 12194
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 6103943
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Portfolio Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Portfolio Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/29/2026

FAQ

How many Iridium (IRDM) shares does Vanguard Portfolio Management own?

Vanguard Portfolio Management beneficially owned 6,103,943 shares of Iridium common stock. This position represented 5.81% of the class as of 03/31/2026, according to the Schedule 13G filing.

Does Vanguard have voting control over the IRDM shares it reports?

Vanguard has sole voting power for 12,194 shares and sole dispositive power for 6,103,943 shares. The filing distinguishes voting authority from dispositive (sell/receive proceeds) authority across accounts.

Was the Schedule 13G for IRDM filed as passive ownership?

Yes. The Schedule 13G indicates passive beneficial ownership above the 5% threshold rather than an active takeover intent. The filing lists holdings across Vanguard funds and managed accounts, consistent with passive reporting.

Who signed the IRDM Schedule 13G for Vanguard and when?

The filing was signed by Ashley Grim, Head of Global Fund Administration, on 04/29/2026. The ownership figures are reported as of 03/31/2026 in the disclosure.

Does the filing identify any other person holding more than 5% of IRDM?

No. The filing states that no other single person's interest in the reported securities exceeds 5% of the class. Holdings reported reflect Vanguard Portfolio Management and affiliated voting/dispositive arrangements.