What is Timothy Kapalka’s Iridium (IRDM) share ownership after these transactions?

Following the reported RSU grant and tax withholding, Timothy Kapalka directly holds 45,029 shares of Iridium common stock. This figure reflects his updated position after accounting for the 4,175-share award and the 692 shares withheld for tax obligations by the company.

Iridium (IRDM) CAO granted 4,175 RSU shares, 692 withheld for taxes

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Iridium Communications Inc. chief accounting officer Timothy Kapalka reported routine equity compensation and related tax withholding in common stock. He received a grant of 4,175 shares, represented by restricted stock units, with no cash paid per share. To cover tax obligations on a separate RSU vesting event, 692 shares were withheld by the issuer at a price of $51.78 per share. After these transactions, he directly held 45,029 shares of common stock. Of the shares underlying this new RSU award, 34% are scheduled to vest on June 1, 2027, with the remaining portion vesting in equal quarterly installments through June 1, 2029, conditioned on his continued service.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Kapalka Timothy

Role CAO Iridium Satellite LLC

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	692	$51.78	$36K
Grant/Award	Common Stock	4,175	$0.00	--

Holdings After Transaction: Common Stock — 45,029 shares (Direct, null)

Footnotes (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. These shares are represented by restricted stock units ("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 June 1, 2027 and the remainder shall vest in equal quarterly installments thereafter on each September 1, December 1, March 1 and June 1, so that all shares of common stock shall be vested as of June 1, 2029, subject to the reporting person's continuous service with the issuer as of each such vesting date.

Key Figures

RSU grant size: 4,175 shares Shares withheld for taxes: 692 shares Tax withholding price: $51.78 per share +3 more

6 metrics

RSU grant size 4,175 shares Common stock represented by restricted stock units granted to CAO

Shares withheld for taxes 692 shares Withheld to satisfy tax obligations on RSU vesting

Tax withholding price $51.78 per share Value used for 692-share tax withholding disposition

Post-transaction holdings 45,029 shares Direct common stock held after reported transactions

Initial vesting portion 34% Portion of RSU award vesting on June 1, 2027

Final vesting date June 1, 2029 All shares under RSU award scheduled to be fully vested by this date

Key Terms

restricted stock units ("RSUs"), tax withholding obligations, vesting and settlement, continuous service

4 terms

restricted stock units ("RSUs") financial

"These shares are represented by restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

tax withholding obligations financial

"withholding of shares by the issuer to satisfy the reporting person's tax withholding obligations in connection"

vesting and settlement financial

"tax withholding obligations in connection with the non-reportable vesting and settlement of restricted stock units"

continuous service financial

"so that all shares of common stock shall be vested as of June 1, 2029, subject to the reporting person's continuous service"

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Form 4 Insider Transactions: What Each Field Means →

06/02/2026 - 07:55 PM

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^*

Kapalka Timothy

(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)
	CAO Iridium Satellite LLC

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/01/2026		F⁽¹⁾		692	D	$51.78	45,029	D
Common Stock	06/01/2026		A		4,175⁽²⁾	A	$0	49,204	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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.

2. These shares are represented by restricted stock units ("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 June 1, 2027 and the remainder shall vest in equal quarterly installments thereafter on each September 1, December 1, March 1 and June 1, so that all shares of common stock shall be vested as of June 1, 2029, subject to the reporting person's continuous service with the issuer as of each such vesting date.

	/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)

Source: View Original Filing on SEC EDGAR

FAQ

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

Iridium reported that chief accounting officer Timothy Kapalka received a grant of 4,175 common shares via restricted stock units, and 692 shares were withheld to satisfy tax obligations on a separate RSU vesting event, leaving him with 45,029 shares directly held afterward.

How many Iridium (IRDM) shares were granted to Timothy Kapalka in this Form 4?

Timothy Kapalka was granted 4,175 shares of Iridium common stock through restricted stock units. Each RSU represents a contingent right to one share of common stock, subject to future vesting conditions and his continued service with the company through the specified vesting dates.

Why were 692 Iridium (IRDM) shares withheld from Timothy Kapalka?

The 692 Iridium shares were withheld by the issuer to satisfy Timothy Kapalka’s tax withholding obligations tied to the non-reportable vesting and settlement of other RSUs. This tax withholding is not an open-market sale but an administrative share disposition for tax payments.

How do Timothy Kapalka’s new RSUs in Iridium (IRDM) vest over time?

For this RSU award, 34% of the underlying Iridium shares vest on June 1, 2027. The remaining shares vest in equal quarterly installments on September 1, December 1, March 1, and June 1, ending on June 1, 2029, contingent on his continuous service.

Is Timothy Kapalka’s Iridium (IRDM) Form 4 a market buy or sale?

The Form 4 does not show a market buy or sale. It reflects a grant of 4,175 shares through RSUs and a 692-share tax withholding disposition. The withholding is an administrative transaction to cover taxes, not an open-market trade reflecting investment sentiment.