Iridium (IRDM) CAO awarded RSUs while shares withheld to cover taxes

Rhea-AI Filing Summary

Iridium Communications Inc. chief accounting officer Timothy Kapalka reported equity compensation and related tax withholding transactions in company common stock. On March 1, 2026, he acquired 13,569 shares at no cost from restricted stock units certified as earned under the 2025 bonus plan, and the resulting shares will vest on March 9, 2026 if his service continues through that date.

The same day, 1,871 shares were disposed of at $22.49 per share to cover tax withholding obligations, rather than an open-market sale. On February 26, 2026, he also received a separate RSU award covering 2,471 shares, with 34% vesting on March 1, 2027 and the remainder in equal quarterly installments until fully vested on March 1, 2029, subject to continued service.

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

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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)
02/26/2026

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	02/26/2026		A		2,471(1)	A	$0	40,600	D
Common Stock	03/01/2026		A		13,569(2)	A	$0	54,169	D
Common Stock	03/01/2026		F(3)		1,871	D	$22.49	52,298	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. Reflects the number of restricted stock units ("RSUs") certified as earned with respect to an award under the issuer's 2025 bonus plan granted on March 1, 2025. Each RSU represents a contingent right to receive one share of common stock of the issuer. The shares will vest on March 9, 2026, subject to the reporting person's continuous service with the issuer as of the vesting date.

2. These shares are represented by RSUs. Each RSU represents a contingent right to receive one share of common stock of the issuer. Of the shares underlying this RSU award, 34% shall vest on March 1, 2027 and the remainder shall vest in equal quarterly installments thereafter on each June 1, September 1, December 1 and March 1, so that all shares of common stock shall be vested as of March 1, 2029, subject to the reporting person's continuous service with the issuer as of each such vesting date.

3. The transaction reported represents the withholding of shares by the issuer to satisfy the reporting person's tax withholding obligations.

	/s/ Peter L. Trentman, Attorney-in-Fact	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did Iridium (IRDM) report for Timothy Kapalka?

Iridium reported that CAO Timothy Kapalka received two restricted stock unit awards and had shares withheld for taxes. He acquired 13,569 shares on March 1, 2026 and 2,471 shares on February 26, 2026, with 1,871 shares withheld the same day for tax obligations.

Were the Iridium (IRDM) insider transactions open-market buys or sells?

The transactions were not open-market trades. Shares were acquired through restricted stock unit awards at no cash cost, and the 1,871-share disposition on March 1, 2026 was issuer share withholding to cover tax liabilities, not a discretionary stock sale into the market.

How many Iridium (IRDM) shares did Timothy Kapalka receive in RSU awards?

Timothy Kapalka received a total of 16,040 Iridium common shares via RSU-related acquisitions: 13,569 shares tied to the 2025 bonus plan on March 1, 2026 and 2,471 shares from a separate RSU grant on February 26, 2026, both contingent on future vesting.

What are the vesting terms of Timothy Kapalka’s Iridium (IRDM) RSUs?

For the 13,569 earned RSUs, the underlying shares vest on March 9, 2026 if employment continues. For the 2,471-share RSU award, 34% vests on March 1, 2027 and the rest vests quarterly through March 1, 2029, all subject to continued service.

Why were 1,871 Iridium (IRDM) shares disposed of in the Form 4?

The 1,871-share disposition on March 1, 2026 reflects shares withheld by Iridium to satisfy Timothy Kapalka’s tax withholding obligations. This is a common mechanism where the company retains part of vested stock instead of requiring a separate cash payment for taxes.

How many Iridium (IRDM) shares does Timothy Kapalka hold after these transactions?

After the reported transactions, Timothy Kapalka directly owned 52,298 Iridium common shares. This figure appears after the March 1, 2026 tax-withholding disposition and reflects his updated direct share balance as reported in the Form 4 data.