Iridium (IRDM) CEO has 9,583 shares withheld for RSU tax obligations

Rhea-AI Filing Summary

Iridium Communications Chief Executive Officer Matthew J. Desch reported a tax-related share disposition. The filing shows 9,583 shares of common stock were withheld by the company at $51.78 per share to cover his tax withholding obligations on vested restricted stock units.

After this withholding, Desch directly holds 1,451,017 shares of common stock. Because the shares were withheld by the issuer to satisfy taxes rather than sold in the open market, this appears as a routine administrative transaction rather than a discretionary sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider DESCH MATTHEW J

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	9,583	$51.78	$496K

Holdings After Transaction: Common Stock — 1,451,017 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares withheld for taxes: 9,583 shares Withholding price per share: $51.78 per share Shares held after transaction: 1,451,017 shares

3 metrics

Shares withheld for taxes 9,583 shares Tax-withholding disposition on common stock

Withholding price per share $51.78 per share Value used for tax-withholding shares

Shares held after transaction 1,451,017 shares Direct common stock ownership following withholding

Key Terms

tax withholding obligations, restricted stock units, withholding of shares, tax-withholding disposition

4 terms

tax withholding obligations financial

"to satisfy the reporting person's tax withholding obligations in connection with"

restricted stock units financial

"in connection with the non-reportable vesting and settlement of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

withholding of shares financial

"represents the withholding of shares by the issuer to satisfy"

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

DESCH MATTHEW J

(Last) (First) (Middle)

C/O IRIDIUM COMMUNICATIONS INC.

1676 INTERNATIONAL DRIVE, SUITE 1100

(Street)

MCLEAN VIRGINIA 22102

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Iridium Communications Inc. [ IRDM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/01/2026		F(1)		9,583	D	$51.78	1,451,017	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transaction reported represents the withholding of shares by the issuer to satisfy the reporting person's tax withholding obligations in connection with the non-reportable vesting and settlement of restricted stock units.

	/s/ Peter L. Trentman, Attorney-in-Fact	06/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Iridium (IRDM) report for CEO Matthew Desch?

Iridium reported a Form 4 showing CEO Matthew Desch had 9,583 common shares withheld by the company to cover tax obligations tied to vested restricted stock units, rather than selling shares in the open market.

Was the Iridium (IRDM) CEO’s Form 4 transaction an open-market sale of shares?

No, the Form 4 states the 9,583 shares represent withholding by the issuer to satisfy tax withholding obligations from restricted stock unit vesting, not an open-market sale initiated by the CEO.

How many Iridium (IRDM) shares does CEO Matthew Desch hold after this tax withholding?

Following the tax withholding transaction, CEO Matthew Desch directly holds 1,451,017 shares of Iridium common stock, according to the Form 4’s post-transaction ownership disclosure for his direct holdings.

What does transaction code "F" mean in the Iridium (IRDM) CEO’s Form 4?

Transaction code "F" indicates a tax-withholding disposition, where shares are delivered to the issuer to pay taxes or exercise costs, rather than sold on the market, consistent with the footnote in this filing.

What price was used for the Iridium (IRDM) CEO’s tax-withholding shares?

The Form 4 reports a transaction price of $51.78 per share for the 9,583 common shares withheld to satisfy CEO Matthew Desch’s tax obligations associated with restricted stock unit vesting.

Why were Iridium (IRDM) shares withheld from CEO Matthew Desch in this Form 4?

The footnote explains the issuer withheld 9,583 shares to satisfy Matthew Desch’s tax withholding obligations arising from the non-reportable vesting and settlement of restricted stock units, making this a routine administrative event.