Iridium (NASDAQ: IRDM) EVP Last reports 1,498-share tax withholding on RSU vesting

Rhea-AI Filing Summary

Iridium Communications Inc. executive Timothy James Last, EVP of Sales & Marketing, reported a routine tax-related share disposition on Common Stock. On June 1, 2026, 1,498 shares were withheld by the company at $51.78 per share to cover his tax withholding obligations from the vesting of restricted stock units.

This was not an open-market sale but an automatic share withholding. After this transaction, he directly holds 112,934 shares of Iridium Communications common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Last Timothy James

Role EVP, Sales & Marketing

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,498	$51.78	$78K

Holdings After Transaction: Common Stock — 112,934 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares withheld for taxes: 1,498 shares Withholding price: $51.78 per share Post-transaction holdings: 112,934 shares +1 more

4 metrics

Shares withheld for taxes 1,498 shares Common Stock withheld on June 1, 2026 for tax obligations

Withholding price $51.78 per share Value used for tax-withholding disposition of 1,498 shares

Post-transaction holdings 112,934 shares Common Stock directly owned by Timothy James Last after transaction

Tax-withholding shares count 1,498 shares Reported as tax withholding in Form 4 transactionSummary

Key Terms

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

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 with the"

withholding of shares financial

"represents the withholding of shares by the issuer to satisfy the reporting person's"

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^*

Last Timothy James

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Sales & Marketing

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)		1,498	D	$51.78	112,934	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 Communications (IRDM) report for Timothy James Last?

Iridium Communications reported that EVP Sales & Marketing Timothy James Last had 1,498 common shares withheld to cover tax obligations from vested restricted stock units, rather than executing an open-market sale or purchase.

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

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. The issuer withheld 1,498 shares at $51.78 each to satisfy Timothy James Last’s tax obligations on vested restricted stock units.

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

The filing reports 1,498 shares of Iridium Communications common stock withheld at $51.78 per share. These shares were used to cover estimated tax obligations associated with the vesting and settlement of restricted stock units.

How many Iridium Communications (IRDM) shares does Timothy James Last hold after the Form 4 event?

Following the reported tax-withholding transaction, Timothy James Last directly holds 112,934 shares of Iridium Communications common stock, according to the post-transaction ownership figure disclosed in the Form 4 filing.

What does a tax-withholding disposition mean for Iridium Communications (IRDM) insiders?

A tax-withholding disposition means the company withholds some shares when restricted stock units vest to pay estimated taxes. For Iridium Communications, 1,498 shares were withheld for Timothy James Last instead of him selling shares in the open market.