Form 8-K

8-K — Anterix Inc.

Accession: 0001304492-26-000016

Filed: 2026-04-06

Period: 2026-03-31

CIK: 0001304492

SIC: 4813 (TELEPHONE COMMUNICATIONS (NO RADIO TELEPHONE))

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — atex-20260331.htm (Primary)

EX-99.1 (anterixandnorthwesternen.htm)

EX-99.2 (anterix-nwecontractfacts.htm)

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8-K (Primary)

Filename: atex-20260331.htm · Sequence: 1

atex-20260331

FALSE00013044923 Garret Mountain PlazaSuite 401Woodland ParkNJ00013044922026-03-312026-03-3100013044922023-04-212023-04-21

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 31, 2026

Anterix Inc.

(Exact name of registrant as specified in its charter)

Delaware 001-36827 33-0745043

(State or other jurisdiction (Commission File Number) (IRS Employer

of incorporation) Identification No.)

3 Garret Mountain Plaza

Suite 401

Woodland Park, NJ

07424

(Address of principal executive offices) (Zip Code)

(973) 771-0300

Registrant’s telephone number, including area code

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12(b))

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading symbol Name of Each Exchange on which registered

Common Stock, $0.0001 par value ATEX The Nasdaq Stock Market LLC

(NASDAQ Capital Market)

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

On April 6, 2026, Anterix Inc. (the “Company”) announced that its wholly-owned subsidiary, PDV Spectrum Holding Company, LLC (“PDV”), entered into a spectrum license sale agreement with NorthWestern Energy (“NWE”) under which PDV sold to NWE 900 MHz broadband licenses (in a 6 MHz broadband configuration for nine (9) counties and a 10 MHz broadband configuration for the remaining counties) covering portions of Montana, South Dakota, and Wyoming, following FCC issuance of broadband licenses transferable from Anterix to NWE.

The Company issued a press release announcing the NWE Agreement. A copy of the press release and a Fact Sheet containing additional information regarding the material terms of the NWE Agreement are being filed as Exhibit 99.1 and Exhibit 99.2 to this Current Report on Form 8-K, respectively, and each is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. Description

99.1

Press Release dated April 6, 2026

99.2

Fact Sheet dated April 6, 2026

104 Cover Page Interactive Data File (formatted as Inline XBRL)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.

Anterix Inc.

Date: April 6, 2026

/s/ Gena L. Ashe

Gena L. Ashe

Chief Legal Officer and Corporate Secretary

EX-99.1

Filename: anterixandnorthwesternen.htm · Sequence: 2

anterixandnorthwesternen

Anterix Expands Private Wireless Leadership with New 10 MHz Grid Deployment Utilities take control of their digital future, leveraging private networks to secure and optimize critical infrastructure WOODLAND PARK, NJ, APRIL 6, 2026 — Anterix (NASDAQ: ATEX), the leader in mission- critical private wireless broadband spectrum for utilities, and NorthWestern Energy announced today a milestone sale agreement, marking the first planned deployment of Anterix’s 10 MHz broadband configuration in the 900 MHz band. The agreement follows the Federal Communications Commission’s (FCC) unanimous February 2026 approval to expand Anterix's broadband spectrum allocation, which will effectively almost double the capacity available for utilities. “NorthWestern Energy’s territory spans vast distances across remote, rugged terrain and extreme weather conditions – exactly where our 900 MHz wireless broadband spectrum delivers unmatched, mission critical connectivity for utility communications,” said Anterix President & CEO, Scott Lang. “We are proud to provide the foundation NorthWestern Energy needs to build a secure platform for a modern grid, enabling the delivery of safe, reliable energy for the communities they serve.” “The increased capacity gained from this 10 MHz broadband configuration is a solid foundation as we expand NorthWestern Energy’s wireless communications network to securely and reliably modernize the grid and energy infrastructure serving our customers,” said NorthWestern Energy Director of Network Engineering and Operations, Mark Maroney. “That means real-time control of remote distribution powerlines and equipment, redundant, reliable connectivity to field devices, real-time monitoring and enhanced situational awareness of our energy systems in areas at high risk for wildfire and more efficient restoration of service when outages do occur.” With this agreement, NorthWestern Energy becomes the tenth utility to secure Anterix’s 900 MHz spectrum. This milestone underscores the industry-wide shift toward private, utility- controlled networks, as the preferred infrastructure for the energy transition. Beyond spectrum, Anterix continues to accelerate utility time-to-value through its TowerX™ nationwide tower access program, CatalyX® turnkey connectivity management, and the Anterix Active Ecosystem of more than 150 technology innovators. Shareholder Contact Natasha Vecchiarelli VP, Investor Relations & Corporate Communications Anterix 973-531-4397 nvecchiarelli@anterix.com

Media Contact Paul Gaige Senior Vice President Burson 504-957-1434 Paul.Gaige@bursonglobal.com About Anterix Anterix is transforming how critical infrastructure stays connected. As the market leader in mission-critical private wireless broadband spectrum for the utility sector, Anterix delivers more secure, private 900 MHz licensed spectrum and advanced intelligent infrastructure solutions that enhance efficiency, strengthen resilience, and accelerate digital transformation. Backed by a growing ecosystem of industry-leading partners, Anterix provides the connectivity foundation that powers a more resourceful and resilient future. Learn more at www.anterix.com. Forward-Looking Statements Certain statements contained in this press release, other than historical information, constitute forward-looking statements within the meaning of the federal securities laws. Words such as “believes,” “anticipates,” “estimates,” “expects,” “intends,” “aims,” “potential,” “will,” “would,” “could,” “considered,” “likely,” “estimate” and variations of these words and similar future or conditional expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements. Forward-looking statements include, but are not limited to, statements regarding: (i) the timing of payments under the Anterix-NWE agreement, (ii) Anterix’s ability to clear any interference with incumbent users of the 900 MHz broadband spectrum allocation in NWE’s service area on a timely basis; (iii) Anterix's ability to qualify for and timely secure broadband licenses in NWE’s service area; and (iv) Anterix's ability to satisfy the other terms of its agreement with NWE. Any such forward-looking statements are based on the current expectations of Anterix's management and are subject to a number of risks and uncertainties that could cause Anterix's actual future results to differ materially from its management's current expectations or those implied by the forward-looking statements. These risks and uncertainties include, but are not limited to: (i) Anterix may not be successful in commercializing its spectrum assets to its targeted utility and critical infrastructure customers on a timely basis and on favorable terms; (ii) Anterix may be unable to secure broadband licenses from the FCC on a timely and cost-effective basis; (iii) Anterix has a limited operating history with its current business plan, which makes it difficult to evaluate its prospects and future financial results and its business activities, strategic approaches and plans may not be successful; and (iv) the value of Anterix's spectrum assets may fluctuate significantly based on supply and demand, as well as technical and regulatory changes. These and other risk factors that may affect Anterix's future results of operations are identified and described in more detail in Anterix's most recent filings on Forms 10-K and 10-Q and in other filings that it makes with the SEC from time to time. These documents are available on Anterix's website at www.anterix.com under the Investor Relations section and on the SEC's website at www.sec.gov. Accordingly, you should not rely upon forward-looking statements as predictions of future events. Except as required by applicable law, Anterix undertakes no obligation to

update publicly or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

EX-99.2

Filename: anterix-nwecontractfacts.htm · Sequence: 3

anterix-nwecontractfacts

04.06.2026 To our shareholders: On March 30, 2026, Anterix and NorthWestern Energy entered into a 900 MHz milestone sale agreement (the “Agreement”). This Agreement marks the first planned deployment of Anterix’s 10 MHz broadband configuration in the 900 MHz band and enables NorthWestern Energy to deploy a mission-critical private wireless broadband network that will enable real-time control of remote distribution powerlines and equipment, redundant, reliable connectivity to field devices, real-time monitoring and enhanced situational awareness of the utility’s energy systems in areas at high risk for wildfire and more efficient restoration of service when outages occur. Key components of the Agreement include: • Assignment of 6 MHz of broadband spectrum, 897.5 MHz – 900.5 MHz paired with 936.5 MHz – 939.5 MHz, covering several counties in Montana and South Dakota. • Assignment of 10 MHz of broadband spectrum, 935 MHz – 940 MHz paired with 896 MHz – 901 MHz, covering portions of Montana, South Dakota, and Wyoming, following FCC issuance of broadband licenses transferable from Anterix to NorthWestern Energy. • Anterix’s commitment to clear any existing incumbents from the 900 MHz broadband allocation in the NorthWestern Energy service territory, as well as a specific requirement for the parties to work together to secure these broadband licenses from the FCC for NorthWestern Energy. • Total contract price of $7.7 million, with an initial payment due upon signing and final payment to Anterix as the broadband licenses are granted by the FCC and the broadband spectrum is assigned to NorthWestern Energy between 2026 and 2033. • The Agreement is subject to customary contractual provisions regarding remedies, including refund of amounts paid by NorthWestern Energy for Anterix’s failure to deliver the 900 MHz license, and termination rights if a party fails to perform its contractual obligations. Forward-Looking Statement - Certain statements contained in this fact sheet, other than historical information, constitute forward-looking statements within the meaning of the federal securities laws. Words such as “believes,” “anticipates,” “estimates,” “expects,” “intends,” “aims,” “potential,” “will,” “would,” “could,” “considered,” “likely,” “estimate” and variations of these words and similar future or conditional expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements. Forward-looking statements include, but are not limited to, statements regarding: (i) the timing of payments under the Anterix- NorthWestern Energy agreement,

04.06.2026 (ii) Anterix’s ability to clear any interference with incumbent users of the 900 MHz broadband spectrum allocation in NorthWestern Energy’s service area on a timely basis; (iii) Anterix's ability to qualify for and timely secure broadband licenses in NorthWestern Energy’s service area; and (iv) Anterix's ability to satisfy the other terms of its agreement with NorthWestern Energy. Any such forward-looking statements are based on the current expectations of Anterix's management and are subject to a number of risks and uncertainties that could cause Anterix's actual future results to differ materially from its management's current expectations or those implied by the forward-looking statements. These risks and uncertainties include, but are not limited to: (i) Anterix may not be successful in commercializing its spectrum assets to its targeted utility and critical infrastructure customers on a timely basis and on favorable terms; (ii) Anterix may be unable to secure broadband licenses from the FCC on a timely and cost-effective basis; (iii) Anterix has a limited operating history with its current business plan, which makes it difficult to evaluate its prospects and future financial results and its business activities, strategic approaches and plans may not be successful; and (iv) the value of Anterix's spectrum assets may fluctuate significantly based on supply and demand, as well as technical and regulatory changes. These and other risk factors that may affect Anterix's future results of operations are identified and described in more detail in Anterix's most recent filings on Forms 10-K and 10-Q and in other filings that it makes with the SEC from time to time. These documents are available on Anterix's website at www.anterix.com under the Investor Relations section and on the SEC's website at www.sec.gov. Accordingly, you should not rely upon forward-looking statements as predictions of future events. Except as required by applicable law, Anterix undertakes no obligation to update publicly or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

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