XOOMAR

Anterix Inc. (ATEX)

Every FINRA and SEC series the site collects for Anterix Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as telephone communications (no radiotelephone).

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1.8M

Short interest

settlement 2026-08-14

4.7

Days to cover

+8.3% vs prior

44.1%

Short share of volume

2026-09-11

385

Fails to deliver

settlement 2026-08-14

-$21.8M

Insider flow, 90 days

0 buys, 26 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 14 August 2026, short interest in ATEX is 1,814,817 shares, down 208,589 shares over the last month. Over the last 48 readings it ranged from 616,332 shares (29 November 2024) to 2,023,406 shares (15 July 2026). At the reported average volume of 386K shares a day that is 4.7 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-141,814,817+8.3%386,3354.70
2026-07-311,675,040-17.2%335,7594.99
2026-07-152,023,406+20.2%432,8364.67
2026-06-301,682,807-3.8%616,2382.73
2026-06-151,749,067+10.1%564,7493.10
2026-05-291,589,075-4.3%394,3244.03
2026-05-151,660,332+6.3%321,9075.16
2026-04-301,561,220+1.2%349,9204.46
2026-04-151,542,541-2.9%307,8825.01
2026-03-311,587,737+3.8%276,4705.74
2026-03-131,530,247-4.5%298,6635.12
2026-02-271,603,040+10.1%567,5842.82
2026-02-131,455,603+4.2%483,9003.01
2026-01-301,397,221+14.0%401,8533.48
2026-01-151,225,669+8.4%203,8366.01
2025-12-311,130,654+1.5%204,1185.54
2025-12-151,113,996+0.1%220,3145.06
2025-11-281,112,743-0.1%225,4954.93
2025-11-141,113,706+9.8%266,0564.19
2025-10-311,014,012+6.2%163,2176.21
2025-10-15954,726+7.4%200,5634.76
2025-09-30889,005-6.0%262,0453.39
2025-09-15945,553-0.0%170,7955.54
2025-08-29945,804-12.1%241,7323.91

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of ATEX volume is 44.1%, down 6.4 points over the last five sessions. Over the last 52 readings it ranged from 39.2% (3 August 2026) to 86.5% (13 July 2026). The latest reading is 18.3 points below the 30-session average of 62.4%, on 169K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-1175K169K44.1%4
2026-09-1075K149K50.5%20
2026-09-0959K104K56.5%3
2026-09-0849K86K57.3%2
2026-09-0441K60K69.5%0
2026-09-0355K108K50.5%100
2026-09-0272K118K60.9%0
2026-09-0162K88K70.8%0
2026-08-3164K84K76.8%0
2026-08-2857K73K78.1%0
2026-08-2765K97K66.9%0
2026-08-2665K89K73.3%0
2026-08-25131K166K79.0%17,893
2026-08-24142K175K81.3%10,117
2026-08-2160K98K61.3%0
2026-08-2056K118K47.8%0
2026-08-1969K90K77.1%3
2026-08-18108K152K71.0%0
2026-08-1788K113K77.6%0
2026-08-1462K141K44.2%69
2026-08-1390K132K68.1%1,558
2026-08-12250K439K56.9%8,893
2026-08-11129K234K55.0%32
2026-08-1069K147K46.7%261
2026-08-0752K79K65.8%0
2026-08-0677K110K69.9%0
2026-08-0577K136K56.5%0
2026-08-0469K103K66.7%2,649
2026-08-0357K145K39.2%1,021
2026-07-3150K97K51.5%0

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in ATEX is 385 shares, down 182 shares over the last settlement date. Over the last 46 readings it ranged from 1 share (12 March 2026) to 74,295 shares (17 November 2025). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-14385$91.49$35K
2026-08-04567$95.65$54K
2026-07-291,463$91.37$134K
2026-07-2417,131$100.42$1.7M
2026-07-2317,115$103.99$1.8M
2026-07-221,960$105.82$207K
2026-07-1623$105.34$2K
2026-07-081$100.90$101
2026-07-071,773$106.04$188K
2026-07-061,955$105.14$206K
2026-07-0120$102.94$2K
2026-06-307,667$98.24$753K
2026-06-2919$89.67$2K
2026-06-2697$81.00$8K
2026-06-181,147$79.16$91K
2026-06-1620$83.01$2K
2026-06-15580$82.50$48K
2026-06-12433$81.44$35K
2026-06-1042$64.55$3K
2026-06-0975$66.24$5K
2026-06-05114$67.95$8K
2026-06-021,496$65.36$98K
2026-04-30300$45.44$14K
2026-04-1313,211$35.89$474K
2026-04-1014,933$37.56$561K
2026-04-02198$39.11$8K
2026-03-23210$39.34$8K
2026-03-19600$38.11$23K
2026-03-121$38.77$39
2026-03-092,027$39.60$80K

Insider trades

SEC Form 4, newest first, 50 of 79 shown. JSON

Insiders at ATEX reported 26 open-market sells worth $21.8M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Martin Heather (Chief Marketing Officer) on 2026-09-10.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-10Martin HeatherChief Marketing OfficerSell8K$84.20$679K27K
2026-09-10DANIELS LESLIE Bn/aSell3K$83.83$210K43K
2026-09-09Martin HeatherChief Marketing OfficerTax withholding3K$85.44$296K35K
2026-09-08Ashe Gena LChief Legal Officer &amp; Corp SecSell4K$85.44$347K5K
2026-09-08Ashe Gena LChief Legal Officer &amp; Corp SecSell293$85.44$25K9K
2026-09-04DANIELS LESLIE Bn/aSell1K$86.50$104K46K
2026-09-04DANIELS LESLIE Bn/aSell3K$87.31$253K47K
2026-09-03DANIELS LESLIE Bn/aSell6K$87.15$523K50K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell3K$90.61$244K45K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell8K$91.69$695K48K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell8K$92.77$723K55K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell5K$93.59$503K63K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerTax withholding17K$90.38$1.5M68K
2026-08-25Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise40K$34.72$1.4M85K
2026-08-19Heard Williamn/aGift5K$0.00$04K
2026-08-14Heard Williamn/aSell46K$90.11$4.2M1.7M
2026-08-14Lang Scott A.President and CEOSell5K$88.96$478K41K
2026-08-14Lang Scott A.President and CEOSell19K$90.16$1.7M47K
2026-08-14Lang Scott A.President and CEOSell10K$90.87$917K66K
2026-08-14Lang Scott A.President and CEOSell800$91.69$73K76K
2026-08-04Fleischhauer Markn/aGrant2K$0.00$014K
2026-08-04Heard Williamn/aGrant2K$0.00$011K
2026-08-04YAZDI MAHVASHn/aGrant2K$0.00$021K
2026-08-04DANIELS LESLIE Bn/aGrant2K$0.00$056K
2026-08-04ALTMAN JEFFREY An/aGrant2K$0.00$017K
2026-07-13Marquez ElenaChief Financial OfficerTax withholding231$100.96$23K18K
2026-07-13Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerTax withholding2K$100.96$153K76K
2026-06-18Lang Scott A.President and CEOSell170$80.25$14K77K
2026-06-17Marquez ElenaChief Financial OfficerSell4K$79.50$341K18K
2026-06-17Marquez ElenaChief Financial OfficerOption exercise1K$40.00$49K23K
2026-06-16YAZDI MAHVASHn/aSell7K$80.00$560K19K
2026-06-15Fleischhauer Markn/aSell4K$79.83$279K13K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell13K$84.29$1.1M78K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell16K$83.72$1.4M91K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell26K$82.27$2.2M108K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerSell35K$81.32$2.9M134K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise26K$49.39$1.3M169K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise7K$42.14$283K144K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise20K$37.42$748K137K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise51K$34.40$1.8M117K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise8K$32.50$260K66K
2026-06-15Guttman-McCabe ChristopherChief Reg &amp; Comm OfficerOption exercise12K$25.75$303K58K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecSell4K$82.14$356K10K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecSell13K$81.04$1.1M14K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecTax withholding11K$82.50$907K27K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecTax withholding5K$82.50$385K38K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecOption exercise18K$49.39$907K43K
2026-06-15Ashe Gena LChief Legal Officer &amp; Corp SecOption exercise11K$34.96$385K25K
2026-06-15Lang Scott A.President and CEOTax withholding48K$82.50$4.0M77K
2026-06-15Lang Scott A.President and CEOTax withholding40K$82.50$3.3M125K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

4 Form 144 notices on file for ATEX worth $4.1M at the prices reported; 4 in the last 90 days worth $4.1M. Latest: HEATHER MARTIN filed on 2026-09-10 to sell 8,064 shares ($679K) from 2026-09-10.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-10HEATHER MARTINOfficer8K$679K0.041%2026-09-10Morgan Stanley Smith Barney LLC Executive Financial Services
2026-09-08GENA L ASHEOfficer4K$372K0.022%2026-09-08Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-25CHRISTOPHER GUTTMAN-MCCABEOfficer23K$2.2M0.120%2026-08-25Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-24THOMAS KUHNDirector10K$889K0.051%2026-08-24Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

1 holder above 5% has filed on ATEX, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 5.1% of the class (999,278 shares), filed 2026-07-27 for an event on 2026-06-30.

FiledFormHolderSharesOf classEvent
2026-07-2713GBlackRock, Inc.parent holding company999K5.1%2026-06-30

13F holders

Tracked managers holding ATEX at their latest 13F. JSON

6 of the 30 tracked managers held ATEX at their latest 13F, $27.7M in total at quarter-end prices. Citadel Advisors is the largest at $11.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.

FundQuarterSharesValueOf portfolioChange in shares
Citadel Advisors2026-06-30116K$11.9M0.00%-109K
D. E. Shaw & Co.2026-06-3096K$9.9M0.00%+91K
Millennium Management2026-06-3030K$3.1M0.00%-6K
AQR Capital Management2026-06-3013K$1.4M0.00%+2K
Point72 Asset Management2026-06-309K$957K0.00%+7K
Two Sigma Investments2026-06-304K$383K0.00%-6K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In Q2 2026 (quarter ended 2026-06-30) Anterix Inc. reported revenue of $2.0M, up 38.1% from the same quarter a year earlier, and net income of $240K (0.01 diluted EPS). In FY 2025 it generated $5.5M of operating cash flow and spent $990K on buybacks.

Cash
$116.0M
Equity
$285.8M
Total assets
$497.9M
Shares outstanding
19,609,786

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-06-30$2.0M$240K12.3%0.01
Q4 2025derived2026-03-31$2.0M$18.5M945.9%n/a
Q4 20252025-12-31$1.6M-$6.6M-419.6%-0.35
Q3 20252025-09-30$1.6M$53.5M3449.5%2.86
Q2 20252025-06-30$1.4M$25.2M1775.7%1.35
Q4 2024derived2025-03-31$1.4M$9.2M662.9%n/a
Q4 20242024-12-31$1.6M$7.7M492.3%0.41
Q3 20242024-09-30$1.6M-$12.8M-823.1%-0.69

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252026-03-31$6.5M$90.6M$5.5M$31K$990Kn/a
FY 20242025-03-31$6.0M-$11.4M-$29.3M$87K$8.4Mn/a
FY 20232024-03-31$4.2Mn/a$42.0M$307K$24.7Mn/a
FY 20222023-03-31$1.9M-$16.3M-$27.3M$2.1M$8.2Mn/a
FY 20212022-03-31$1.1M-$37.5M$17.9M$1.1M$15.0Mn/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-08-06 from the cover page.

What this page is

Anterix Inc. in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows Anterix Inc. (ATEX), SEC CIK 1304492, listed on Nasdaq, classified by the SEC as telephone communications (no radiotelephone). The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-14.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-10.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-07-27.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-10.JSON and CSV
Company record
EDGAR filing index for CIK 1304492Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as telephone communications (no radiotelephone)

Datasets

Frequently Asked Questions

How much of ATEX is sold short?
1,814,817 shares were held short at the 2026-08-14 settlement, 4.7 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is ATEX's daily short volume?
On 2026-09-11, 74,596 of the 169,154 ATEX shares reported to FINRA were sold short, 44.1% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ATEX have fails to deliver?
The SEC's latest file shows 385 ATEX shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are ATEX insiders buying or selling?
Insiders at ATEX reported 26 open-market sells worth $21.8M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Martin Heather (Chief Marketing Officer) on 2026-09-10.
Have ATEX insiders filed to sell?
4 Form 144 notices on file for ATEX worth $4.1M at the prices reported; 4 in the last 90 days worth $4.1M. Latest: HEATHER MARTIN filed on 2026-09-10 to sell 8,064 shares ($679K) from 2026-09-10.
Who owns more than 5% of ATEX?
1 holder above 5% has filed on ATEX, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 5.1% of the class (999,278 shares), filed 2026-07-27 for an event on 2026-06-30.
What did ATEX report last quarter?
In Q2 2026 (quarter ended 2026-06-30) Anterix Inc. reported revenue of $2.0M, up 38.1% from the same quarter a year earlier, and net income of $240K (0.01 diluted EPS). In FY 2025 it generated $5.5M of operating cash flow and spent $990K on buybacks.
Which funds hold ATEX?
6 of the 30 tracked managers held ATEX at their latest 13F, $27.7M in total at quarter-end prices. Citadel Advisors is the largest at $11.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.