13D Filings
NEXTNAV INC.
NN
Amendment
Ownership

3.90%

Total Shares

5,488,884

Issuer CIK

1865631

Event Date

May 21, 2026

Accepted

May 22, 2026, 08:00 PM

Reporting Persons (3)
NameType% of ClassAggregateSole VotingShared Voting
Milfam CI LLC Spartacus
Other
3.90%5,488,88405,488,884
SUBIN NEIL S
Individual
2.50%3,447,328180,5233,266,805
MILFAM CI Management LLC
Other
0.00%000
Disclosure Items (4)

Security Title

Common Stock, par value $0.0001 per share

Issuer Name

NEXTNAV INC.

Issuer Address

11911 Freedom Dr., Reston, VA, 20190

Percentage of Class

See rows (11) and (13) of the cover pages to this Amendment for the aggregate number of shares of Common Stock and percentages of the shares of Common Stock beneficially owned by each Reporting Person. The percentage reported in this Amendment is based upon 136,439,939 shares of Common Stock outstanding as of May 11, 2026 (according to the Form 10-Q).

Number of Shares

See rows (7) through (10) of the cover pages to this Amendment for the number of shares of Common Stock as to which each Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.

Transactions

The following transactions were effected in the sixty days prior to the date of this Amendment involving the Reporting Persons: N/A

Shareholders

N/A

Date of 5% Ownership

May 22, 2026

On May 22, 2026, CI Spartacus entered into a Portfolio Management Agreement (the "PMA") with Warberg Asset Management LLC (the "Portfolio Manager"), pursuant to which CI Spartacus appointed the Portfolio Manager as its investment advisor with sole and exclusive discretionary trading authority over securities held by CI Spartacus. As a result of the PMA, neither CI Management nor Mr. Subin, through his ownership and control of CI Management, retains beneficial ownership of the securities held by CI Spartacus, and each Reporting Person has accordingly ceased to be the beneficial owner of more than five percent of the Common Stock.

Exhibit 1 - Portfolio Management Agreement, dated May 22, 2026, by and between Warberg Asset Management LLC and MILFAM CI LLC SPARTACUS. (Schedules and exhibits have been omitted as they are not material. They will be furnished supplementally to the SEC upon request.)

NEXTNAV INC. — Schedule 13D | 13D Filings