Tax withholding trims Iridium (IRDM) CAO Timothy Kapalka’s stake

Rhea-AI Filing Summary

Iridium Communications Inc. chief accounting officer Timothy Kapalka reported a small administrative share disposition related to taxes. On March 9, 2026, 744 shares of common stock at $24.01 per share were withheld by the company to cover his tax obligations on vested restricted stock units. After this tax-withholding transaction, he directly owns 51,554 shares of Iridium common stock. This was not an open-market sale but an automatic withholding by the issuer.

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

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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^*

Kapalka Timothy

(Last) (First) (Middle)

C/O IRIDIUM COMMUNICATIONS INC.

1750 TYSONS BOULEVARD, SUITE 1400

(Street)

MCLEAN VA 22102

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CAO Iridium Satellite LLC

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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

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

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

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	03/09/2026		F(1)		744	D	$24.01	51,554	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	03/11/2026
	** Signature of Reporting Person	Date
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FAQ

What did Iridium (IRDM) insider Timothy Kapalka report in this Form 4?

Timothy Kapalka reported that 744 Iridium shares were withheld to pay taxes on vested restricted stock units. The issuer retained these shares, and the event reflects a routine tax-withholding adjustment rather than an open-market purchase or sale.

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

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Iridium withheld 744 common shares to satisfy Kapalka’s tax obligation tied to RSU vesting, as described in the filing’s footnote.

How many Iridium (IRDM) shares were involved and at what price?

The filing reports 744 shares of Iridium common stock, valued at $24.01 per share, were withheld. This price is used to calculate the value of shares applied toward Timothy Kapalka’s tax liability on his restricted stock unit vesting.

How many Iridium (IRDM) shares does Timothy Kapalka hold after this transaction?

After the tax-withholding transaction, Timothy Kapalka directly owns 51,554 shares of Iridium common stock. This shows that only a small portion of his holdings was used to cover taxes related to restricted stock unit vesting.

What role does Timothy Kapalka hold at Iridium (IRDM)?

Timothy Kapalka is an officer serving as Chief Accounting Officer of Iridium Satellite LLC, an Iridium Communications Inc. subsidiary. His Form 4 filing reflects changes in his directly held Iridium common stock due to tax withholding.