Iridium CEO has 9,583 shares withheld for taxes

Iridium’s CEO had a small number of shares withheld to cover taxes on vested RSUs, leaving him with over 1.44 million directly held shares.

Rhea-AI Filing Summary

Iridium Communications Inc. (IRDM) reported that Chief Executive Officer and director Matthew J. Desch had 9,583 shares of common stock withheld on September 1, 2026, at $46.98 per share to satisfy tax withholding obligations related to the vesting of restricted stock units. The shares were withheld by the issuer as a payment of tax liability, not sold in the market, and Mr. Desch now holds 1,441,434 shares of Iridium common stock directly. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 9,583 shares

Tax Withholding 1 txn

Insider DESCH MATTHEW J

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	9,583	$46.98	$450K

Holdings After Transaction: Common Stock — 1,441,434 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Shares withheld for tax: 9,583 shares Per-share value for withholding: $46.98 per share Shares held after transaction: 1,441,434 shares +1 more

4 metrics

Shares withheld for tax 9,583 shares Shares of Iridium common stock withheld on September 1, 2026 for tax withholding obligations

Per-share value for withholding $46.98 per share Value used for the 9,583 shares withheld for tax on September 1, 2026

Shares held after transaction 1,441,434 shares Directly held Iridium common stock by CEO Matthew J. Desch following the September 1, 2026 transaction

Code F transaction shares 9,583 shares Shares delivered or withheld for payment of tax liability as reported in the Form 4

Key Terms

restricted stock units, tax withholding obligations, withholding of shares, Form 4

4 terms

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.

tax withholding obligations financial

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

withholding of shares financial

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

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

What insider transaction did IRDM report for CEO Matthew J. Desch?

Iridium reported that 9,583 shares of common stock were withheld on September 1, 2026 to satisfy Matthew J. Desch’s tax withholding obligations from the vesting of restricted stock units. The issuer withheld the shares as payment of tax liability, not as an open-market sale.

At what price were the withheld IRDM shares valued in this Form 4?

The 9,583 shares of Iridium common stock withheld for tax purposes were valued at $46.98 per share. This withholding was reported as a payment of tax liability by delivering or withholding securities in connection with restricted stock unit vesting.

How many IRDM shares does the CEO hold after this reported transaction?

Following the September 1, 2026 withholding transaction, Chief Executive Officer Matthew J. Desch directly holds 1,441,434 shares of Iridium Communications Inc. common stock. This figure reflects his direct ownership after the tax-related share withholding event.

Was the IRDM CEO’s September 1, 2026 transaction part of a Rule 10b5-1 plan?

No. The filing’s Rule 10b5-1 checkbox is not selected, and no footnote indicates a trading plan. The September 1, 2026 withholding of 9,583 shares for tax obligations is therefore not reported as occurring under a Rule 10b5-1 trading plan.

Did the IRDM Form 4 report any open-market buys or sells by the CEO?

No. The Form 4 reports only a Code F transaction, where 9,583 shares were withheld by the issuer to satisfy tax withholding obligations on restricted stock unit vesting. It does not report any open-market purchases or sales.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/02/2026 - 05:13 PM Accepted by SEC EDGAR 09/02/2026 - 05:11 PM Learn about SEC filing dates

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)
09/01/2026

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	09/01/2026		F(1)		9,583	D	$46.98	1,441,434	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	09/02/2026
	** 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)