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<title>atex-20260325</title></head><body><div style="display:none"><ix:header><ix:hidden><ix:nonNumeric contextRef="c-1" name="dei:AmendmentFlag" format="ixt:fixed-false" id="f-22">FALSE</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:EntityCentralIndexKey" id="f-23">0001304492</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressAddressLine1" id="f-24">3 Garret Mountain Plaza</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressAddressLine2" id="f-25">Suite 401</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressCityOrTown" id="f-26">Woodland Park</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressStateOrProvince" id="f-27">NJ</ix:nonNumeric></ix:hidden><ix:references xml:lang="en-US"><link:schemaRef xlink:type="simple" xlink:href="atex-20260325.xsd"/></ix:references><ix:resources><xbrli:context id="c-1"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0001304492</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2026-03-25</xbrli:startDate><xbrli:endDate>2026-03-25</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="c-2"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0001304492</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2023-04-21</xbrli:startDate><xbrli:endDate>2023-04-21</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div><div id="ibe2790c167454d3881f7fe816789a9d0_1"></div><div style="min-height:45pt;width:100%"><div><span><br/></span></div></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:18pt;font-weight:700;line-height:108%">UNITED STATES</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:18pt;font-weight:700;line-height:108%">SECURITIES AND EXCHANGE COMMISSION</span></div><div 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</span></div><div><span><br/></span></div><div style="text-align:right"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> </span></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><span><br/></span></div></div></div><div id="ibe2790c167454d3881f7fe816789a9d0_7"></div><hr style="page-break-after:always"/><div style="min-height:45pt;width:100%"><div><span><br/></span></div></div><div style="margin-top:12pt;padding-left:72pt;text-indent:-72pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:108%">Item 8.01 Other Events.</span><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> </span></div><div><span><br/></span></div><div><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%">On March 25, 2026, Anterix Inc. (the &#8220;Company&#8221;) announced that its wholly-owned subsidiary, PDV Spectrum Holding Company, LLC (&#8220;PDV&#8221;), entered into a spectrum license sale agreement with Texas-New Mexico Power (&#8220;TNMP&#8221;) under which </span><span style="color:#000000;font-family:'Times New Roman',serif;font-size:12pt;font-weight:400;line-height:112%"> </span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%">PDV sold to TNMP a 900 MHz broadband license covering portions of Brazoria and Galveston counties in Texas (the &#8220;TNMP Agreement&#8221;). </span></div><div><span><br/></span></div><div><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%">The Company issued a press release announcing the TNMP Agreement and posted a Fact Sheet (the &#8220;Fact Sheet&#8221;) containing additional information regarding the material terms of the TNMP Agreement on the Investor Relations page of its website at: www.investors.anterix.com. </span></div><div><span><br/></span></div><div><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%">A copy of the press release and Fact Sheet 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. The information on or accessible through the Company&#8217;s website, other than the Fact Sheet, is not incorporated into this Current Report on Form 8-K.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div id="ibe2790c167454d3881f7fe816789a9d0_10"></div><div style="-sec-extract:summary;margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:108%">Item 9.01. Financial Statements and Exhibits.</span><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> </span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">(d) Exhibits.  </span></div><div style="margin-top:12pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:22.990%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:5.718%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:67.992%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:100%">Exhibit No.</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:100%">Description</span></td></tr><tr><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%">99.1</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline"><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterixandtnmpcontract-p.htm">Press Release dated </a><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterixandtnmpcontract-p.htm">April </a><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterixandtnmpcontract-p.htm">1</a><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterixandtnmpcontract-p.htm">, 2026</a></span></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%">99.2</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline"><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterix-tnmpcontractfact.htm">Fact Sheet dated </a><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterix-tnmpcontractfact.htm">April 1</a><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%;text-decoration:underline" href="anterix-tnmpcontractfact.htm">, 2026</a></span></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%">104</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:100%">Cover Page Interactive Data File (formatted as Inline XBRL)</span></td></tr></table></div><div><span><br/></span></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><span><br/></span></div></div></div><div id="ibe2790c167454d3881f7fe816789a9d0_13"></div><hr style="page-break-after:always"/><div style="min-height:45pt;width:100%"><div><span><br/></span></div></div><div style="margin-top:5pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:108%">SIGNATURES</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">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.</span></div><div style="margin-top:24pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:99.848%"><tr><td style="width:1.0%"/><td style="width:41.388%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:56.412%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:700;line-height:108%">Anterix Inc.</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">&#160;</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">Dat</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">e: April 1, 2026</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%;text-decoration:underline">/s/ Gena L. Ashe </span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">Gena L. Ashe</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%">Chief Legal Officer and Corporate Secretary</span></td></tr></table></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:1pt;font-weight:400;line-height:108%"> </span></div><div style="text-align:right"><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> </span></div><div><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:108%"> `</span></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><span><br/></span></div></div></div></body></html>