Iridium (IRDM) EVP Scheimreif reports RSU grants and tax share withholding

Rhea-AI Filing Summary

Iridium Communications EVP Scott Scheimreif reported equity compensation transactions in company common stock. On March 1, 2026, he acquired 66,805 shares at $0.0000 per share as stock awards tied to the issuer’s 2025 bonus plan and performance-based RSUs, while 12,592 shares were disposed at $22.49 per share to cover tax withholding obligations. Additional stock awards of 4,963 shares and 20,548 shares on February 26, 2026 represent RSUs and PSUs that will vest gradually through March 1, 2031, 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

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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^*

Scheimreif Scott

(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)
	EVP-GOVERNMENT PROGRAMS

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		4,963(1)	A	$0	189,600	D
Common Stock	02/26/2026		A		20,548(2)	A	$0	210,148	D
Common Stock	03/01/2026		A		66,805(3)	A	$0	276,953	D
Common Stock	03/01/2026		F(4)		12,592	D	$22.49	264,361	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. Reflects the number of shares certified as earned with respect to an award of performance-based RSUs ("PSUs") granted on March 1, 2024. One half of the PSUs settled on March 1, 2026 and the remaining PSUs will vest and be settled on March 1, 2027.

3. 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, 20% 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, 2031, subject to the reporting person's continuous service with the issuer as of each such vesting date.

4. 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 IRDM executive Scott Scheimreif report?

Scott Scheimreif reported equity compensation transactions in Iridium Communications common stock. He received multiple restricted stock and performance-based stock awards and had shares withheld by the company to satisfy tax obligations related to vesting, rather than executing open-market purchases or sales.

How many Iridium (IRDM) shares did Scheimreif acquire in the latest Form 4?

Scheimreif acquired stock awards totaling 66,805 shares on March 1, 2026, plus 4,963 and 20,548 shares on February 26, 2026. These represent restricted stock units and performance-based RSUs granted at no cash cost, subject to future vesting conditions.

Did Scheimreif sell Iridium (IRDM) shares in the open market?

The filing shows no open-market sales. Instead, 12,592 shares were disposed at $22.49 per share to satisfy tax withholding obligations, with shares withheld by the issuer, which is a common non-cash method of paying taxes on vested equity awards.

What are the vesting terms of Scheimreif’s new RSU awards at Iridium?

The RSUs vest over several years. A bonus-plan award vests on March 9, 2026, while another RSU grant vests 20% on March 1, 2027 and the remaining shares in equal quarterly installments until full vesting by March 1, 2031, contingent on continued service.

What performance-based RSUs (PSUs) did Scheimreif receive from Iridium?

One transaction reflects PSUs granted on March 1, 2024. Half of these PSUs settled on March 1, 2026, with the remaining portion scheduled to vest and settle on March 1, 2027, aligning compensation with performance goals over a multi-year period.

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

After the reported transactions, Scheimreif directly owned 264,361 shares of Iridium common stock. This figure reflects stock awards received and the shares withheld to satisfy tax obligations, as disclosed in the latest Form 4 filing.