Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 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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1. Name and Address of Reporting Person * Foundation Holdco LP 2. Issuer Name and Ticker or Trading Symbol NEXTNAV INC. [NN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1345 AVENUE OF THE AMERICAS, 46TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 06/17/2026 (Street) NEW YORK, NY 10105 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) 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, par value $0.0001 per share 06/17/2026 C(1) 3,989,738 A $12.56 3,989,738 I See Footnotes(2)(3)(4)(5)(8) Common stock, par value $0.0001 per share 2,500,000 I See Footnotes(3)(4)(5)(6)(8) Common stock, par value $0.0001 per share 11,678,054 I See Footnotes(3)(4)(5)(7)(8)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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 of Derivative Security: 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

5.00% Senior Secured Convertible Notes due 2028

$12.56

06/17/2026

C(1)

50,000,000

(1)

06/30/2028

Common Stock

3,989,738

$ 0

0

I

See Footnotes(2)(3)(4)(5)(8)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Foundation Holdco LP 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X
FIG Parent, LLC 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X
FINCO I LLC 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X
FINCO I Intermediate Holdco LLC 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X
CF NNAV-E LLC 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X
FCOF V UST LLC 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY 10105		X

Signatures

/s/ David N. Brooks - for Foundation Holdco LP, By: FIG Buyer GP, LLC, its general partner, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date
/s/ David N. Brooks - for FIG Parent, LLC, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date
/s/ David N. Brooks - for FINCO I LLC, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date
/s/ David N. Brooks - for FINCO I Intermediate Holdco LLC, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date
/s/ David N. Brooks - for CF NNAV-E LLC, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date
/s/ David N. Brooks - for FCOF V UST LLC, By: David N. Brooks, its Secretary		06/22/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The 5.00% Senior Secured Notes due 2028 (the "Convertible Notes") are convertible at any time into a number of shares of Common Stock equal to (i) the sum of the then-outstanding principal amount of the Convertible Notes to be converted plus all accrued and unpaid interest to the date of the conversion divided by (ii) $12.56, subject to the terms of the Note Purchase Agreement.
(2)	Held directly by CF NNAV-CNV LLC ("CF NNAV-CNV"). FCOF V UL Investments LLC, a Delaware limited liability company ("FCOF V UL"), is the majority member of CF NNAV-CNV. Fortress Credit Opportunities Fund V(A) L.P., a Cayman limited partnership ("FCOF V(A)"), FCOF V B Investments LLC, a Delaware limited liability company, FCOF V CDG Investments LLC, a Delaware limited liability company ("FCOF V CDG Investments"), and Fortress Credit Opportunities Fund V(E) L.P., a Delaware limited partnership ("FCOF V(E)") collectively hold a 100% interest in FCOF V UL.
(3)	FCO Fund V GP LLC, a Delaware limited liability company ("FCO Fund V GP") is the general partner of FCOF V(A), Fortress Credit Opportunities Fund V(B) L.P., a Cayman limited partnership ("FCOF V(B)"), Fortress Credit Opportunities Fund V(C) L.P., a Cayman limited partnership ("FCOF V(C)"), Fortress Credit Opportunities Fund V(D) L.P., a Cayman limited partnership ("FCOF V(D)"), FCOF V(E) and Fortress Credit Opportunities Fund V(G) L.P., a Cayman limited partnership ("FCOF V(G)"). Fortress Credit Opportunities V Advisors LLC, a Delaware limited liability company ("FCO V Advisors"), is the investment advisor of FCOF V(A), FCOF V(B), FCOF V(D), FCOF V(E) and FCOF V(G). Fortress Credit Opportunities V-C Advisors LLC, a Delaware limited liability company ("FCO V-C Advisors") is the investment advisor of FCOF V(C).
(4)	FIG LLC, a Delaware limited liability company ("FIG") holds all of the interests in FCO V Advisors and FCO V-C Advisors. Hybrid GP Holdings (Cayman) LLC, a Delaware limited liability company ("Hybrid GP Holdings (Cayman)") holds all of the interests in FCO Fund V GP. Hybrid GP Holdings LLC, a Delaware limited liability company ("Hybrid GP Holdings") holds all of the interests in Hybrid GP Holdings (Cayman).
(5)	Fortress Operating Entity I LP, a Delaware limited partnership ("FOE I"), is the managing member of Hybrid GP Holdings, and the owner of all of the issued and outstanding interests of FIG. FIG Blue LLC, a Delaware limited liability company ("FIG Blue"), is the general partner of FOE I. FIG Blue is wholly owned by Fortress Investment Group LLC, a Delaware limited liability company ("Fortress Investment Group"). FINCO I Intermediate Holdco LLC, a Delaware limited liability company ("FINCO I IH"), is the sole member of Fortress Investment Group. FINCO I LLC, a Delaware limited liability company, is the sole member of FINCO I IH. FIG Parent, LLC, a Delaware limited liability company ("FIG Parent"), is the sole member of FINCO I LLC. Foundation Holdco LP, a Delaware limited partnership ("Foundation Holdco"), is the sole member of FIG Parent. FIG Buyer GP, LLC, a Delaware limited liability company is the general partner of Foundation Holdco.
(6)	Held directly by CF NNAV-P LLC ("CF NNAV-P"). FCOF V UB Investments L.P., a Cayman Islands limited partnership ("FCOF V UB"), is the majority member of CF NNAV-P. FCOF V(A), FCOF V(B), FCOF V(C), FCOF V(D), FCOF V(E) and FCOF V(G), collectively hold a 100% interest in FCOF V UB.
(7)	Held directly by CF NNAV-E LLC ("CF NNAV-E"). FCOF V UST LLC, a Delaware limited liability company ("FCOF V UST") is the majority member of CF NNAV-E. FCOF V CDG Investments is the majority member of FCOF V UST. FCOF V(G) is the majority member of FCOF V CDG Investments.
(8)	Each reporting person disclaims beneficial ownership of all reported securities except to the extent of its pecuniary interest therein and the inclusion of the securities in this report shall not be deemed to be an admission of beneficial ownership of the reported shares for the purposes of Section 16 or otherwise.
Remarks: This Form 4 is one of two reports relating to the same transactions being filed jointly by FIG Buyer GP, LLC, Fortress Investment Group LLC, Hybrid GP Holdings LLC, Hybrid GP Holdings (Cayman) LLC, Fortress Operating Entity I L.P., FIG Blue LLC, FIG LLC, FCOF V CDG Investments LLC, FCO Fund V GP LLC, Fortress Credit Opportunities V Advisors LLC, Foundation Holdco LP, FIG Parent, LLC, FINCO I LLC, FINCO I Intermediate Holdco LLC, CF NNAV-E LLC and FCOF V UST LLC.

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