Anterix Inc. - ATEX

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q1 2026 · Compare: Q4 2025
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
Owl Creek Asset Management, L.P. History No change 5,411,776 206,675 14.95% 3.57% 1 0 0.0% Q1 2026 May 15, 2026
Heard Capital LLC History No change 1,716,738 65,562 3.39% 1.76% 2 0 0.0% Q1 2026 May 15, 2026
BlackRock, Inc. History Reduced 1,007,143 38,462 0.0% 0.0% 3 -11,132 -1.09% Q1 2026 May 13, 2026
VANGUARD CAPITAL MANAGEMENT LLC History New 573,847 21,915 0.0% 4 +573,847 New Q1 2026 May 15, 2026
VANGUARD GROUP INC History No change 931,305 20,330 0.0% 0.0% 5 0 0.0% Q4 2025 Jan 29, 2026
QVT Financial LP History No change 503,941 19,245 1.41% 0.94% 6 0 0.0% Q1 2026 May 15, 2026
PLUSTICK MANAGEMENT LLC History New 499,596 19,079 9.21% 7 +499,596 New Q1 2026 May 15, 2026
JANE STREET GROUP, LLC History Added to 459,457 17,546 0.0% 0.0% 8 +290,343 171.68% Q1 2026 May 12, 2026
GAMCO INVESTORS, INC. ET AL History Added to 425,820 16,262 0.16% 0.09% 9 +3,350 0.79% Q1 2026 May 14, 2026
DIMENSIONAL FUND ADVISORS LP History Added to 424,856 16,222 0.0% 0.0% 10 +99,933 30.76% Q1 2026 May 07, 2026
STATE STREET CORP History Added to 387,918 14,814 0.0% 0.0% 11 +54,130 16.22% Q1 2026 May 15, 2026
GEODE CAPITAL MANAGEMENT, LLC History Added to 374,301 14,299 0.0% 0.0% 12 +14,162 3.93% Q1 2026 May 15, 2026
Caption Management, LLC History Added to 344,900 13,171 0.08% 0.01% 13 +271,907 372.51% Q1 2026 May 15, 2026
GARNET EQUITY CAPITAL HOLDINGS, INC. History Reduced 343,496 13,118 2.04% 1.14% 14 -53,899 -13.56% Q1 2026 May 15, 2026
MILLENNIUM MANAGEMENT LLC History Reduced 307,922 11,759 0.0% 0.0% 15 -132,024 -30.01% Q1 2026 May 15, 2026
GRATIA CAPITAL, LLC History New 287,500 10,979 4.83% 16 +287,500 New Q1 2026 May 15, 2026
GABELLI FUNDS LLC History Reduced 265,800 10,150 0.07% 0.05% 17 -39,107 -12.83% Q1 2026 May 14, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History Added to 247,298 9,444 0.0% 0.0% 18 +157,055 174.04% Q1 2026 May 15, 2026
Potrero Capital Research LLC History New 229,561 8,766 5.38% 19 +229,561 New Q1 2026 May 15, 2026
CITADEL ADVISORS LLC History Added to 224,663 8,579 0.0% 0.0% 20 +104,283 86.63% Q1 2026 May 15, 2026
AYAL Capital Advisors Ltd History Reduced 197,119 7,527 2.04% 2.02% 21 -67,881 -25.62% Q1 2026 May 15, 2026
Potomac Capital Management, Inc. History Reduced 181,302 6,923 6.02% 3.29% 22 -6,598 -3.51% Q1 2026 May 14, 2026
HRT FINANCIAL LP History Added to 174,925 6,680 0.02% 0.0% 23 +131,835 305.95% Q1 2026 May 14, 2026
DG Capital Management, LLC History Added to 168,217 6,424 1.97% 0.2% 24 +146,972 691.8% Q1 2026 May 12, 2026
BANK OF AMERICA CORP /DE/ History Added to 167,781 6,407 0.0% 0.0% 25 +24,657 17.23% Q1 2026 May 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC History New 164,542 6,283 0.0% 26 +164,542 New Q1 2026 May 08, 2026
GOLDMAN SACHS GROUP INC History Added to 161,786 6,178 0.0% 0.0% 27 +37,156 29.81% Q1 2026 May 15, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History Added to 141,388 5,399 0.0% 0.0% 28 +2,711 1.95% Q1 2026 May 15, 2026
FMR LLC History Added to 135,295 5,166 0.0% 0.0% 29 +84,251 165.06% Q1 2026 May 15, 2026
Panoramic Capital, LLC History New 135,000 5,155 3.62% 30 +135,000 New Q1 2026 May 15, 2026
CenterBook Partners LP History New 127,674 4,875 0.26% 31 +127,674 New Q1 2026 May 05, 2026
CITIGROUP INC History Added to 119,861 4,577 0.0% 0.0% 32 +119,233 18986.15% Q1 2026 May 11, 2026
VANGUARD FIDUCIARY TRUST CO History New 119,456 4,562 0.0% 33 +119,456 New Q1 2026 May 08, 2026
NORTHERN TRUST CORP History Added to 117,610 4,491 0.0% 0.0% 34 +3,348 2.93% Q1 2026 May 14, 2026
KIRR MARBACH & CO LLC /IN/ History Added to 113,814 4,346 0.79% 0.42% 35 +13,396 13.34% Q1 2026 Apr 17, 2026
ARDSLEY ADVISORY PARTNERS LP History New 110,000 4,200 0.54% 36 +110,000 New Q1 2026 May 15, 2026
MORGAN STANLEY History Reduced 102,658 3,920 0.0% 0.0% 37 -6,787 -6.2% Q1 2026 May 15, 2026
Beartown Capital Management, LLC History Reduced 100,000 3,819 1.83% 2.29% 38 -45,000 -31.03% Q1 2026 May 14, 2026
Atom Investors LP History Added to 84,179 3,214 0.23% 0.14% 39 +1,094 1.32% Q1 2026 May 15, 2026
OpenArc Corporate Advisory, LLC History New 73,848 2,820 0.04% 40 +73,848 New Q1 2026 May 11, 2026
Bank of New York Mellon Corp History Reduced 67,836 2,590 0.0% 0.0% 41 -956 -1.39% Q1 2026 May 05, 2026
Waterfront Wealth Inc. History Added to 59,955 2,289 0.42% 0.22% 42 +11,328 23.3% Q1 2026 Apr 30, 2026
Squarepoint Ops LLC History Added to 59,736 2,281 0.0% 0.0% 43 +6,619 12.46% Q1 2026 May 15, 2026
Marble Bar Asset Management LLP History Added to 53,509 2,043 2.01% 6.71% 44 +40,243 303.35% Q1 2026 May 14, 2026
Teton Advisors, LLC History No change 53,000 2,024 1.42% 0.8% 45 0 0.0% Q1 2026 May 14, 2026
Resolute Capital Asset Partners LLC History New 51,106 1,951 1.03% 46 +51,106 New Q1 2026 May 15, 2026
UBS Group AG History Reduced 47,875 1,828 0.0% 0.0% 47 -912 -1.87% Q1 2026 May 05, 2026
683 Capital Management, LLC History New 46,000 1,756 0.09% 48 +46,000 New Q1 2026 May 15, 2026
SIMPLEX TRADING, LLC History Added to 43,750 1,670 0.0% 0.0% 49 +21,200 94.01% Q1 2026 May 14, 2026
Campbell & CO Investment Adviser LLC History Added to 40,460 1,545 0.09% 0.03% 50 +12,955 47.1% Q1 2026 May 15, 2026
Trexquant Investment LP History Reduced 40,175 1,534 0.01% 0.01% 51 -6,223 -13.41% Q1 2026 May 15, 2026
Creative Planning History Added to 31,964 1,220 0.0% 0.0% 52 +1,185 3.85% Q1 2026 May 12, 2026
IMC-Chicago, LLC History Added to 30,363 1,159 0.0% 0.0% 53 +16,986 126.98% Q1 2026 May 05, 2026
J. Goldman & Co LP History New 27,333 1,043 0.03% 54 +27,333 New Q1 2026 May 15, 2026
Schonfeld Strategic Advisors LLC History Reduced 23,211 886 0.01% 0.0% 55 -26,251 -53.07% Q1 2026 May 15, 2026
Nuveen, LLC History Reduced 22,875 873 0.0% 0.0% 56 -30,280 -56.97% Q1 2026 Apr 30, 2026
Proficio Capital Partners LLC History No change 20,000 763 0.04% 0.03% 57 0 0.0% Q1 2026 May 14, 2026
APIS CAPITAL ADVISORS, LLC History New 19,740 753 0.12% 58 +19,740 New Q1 2026 May 15, 2026
WOODMONT INVESTMENT COUNSEL LLC History Added to 18,307 699 0.04% 0.02% 59 +991 5.72% Q1 2026 May 05, 2026
Virtu Financial LLC History New 17,885 683 0.03% 60 +17,885 New Q1 2026 May 14, 2026
GWN SECURITIES INC. History New 16,468 628 0.12% 61 +16,468 New Q1 2026 May 14, 2026
STRS OHIO History Reduced 15,700 599 0.0% 0.0% 62 -10,800 -40.75% Q1 2026 Apr 24, 2026
Quantinno Capital Management LP History Added to 15,619 596 0.0% 0.0% 63 +6,132 64.64% Q1 2026 May 15, 2026
SIG BROKERAGE, LP History New 15,000 572 0.02% 64 +15,000 New Q1 2026 May 15, 2026
Quadrature Capital Ltd History New 14,502 553 0.01% 65 +14,502 New Q1 2026 May 15, 2026
RHUMBLINE ADVISERS History Reduced 14,115 539 0.0% 0.0% 66 -803 -5.38% Q1 2026 May 12, 2026
Inspire Investing, LLC History New 13,309 508 0.04% 67 +13,309 New Q1 2026 Apr 23, 2026
STATE OF WISCONSIN INVESTMENT BOARD History Reduced 13,269 506 0.0% 0.0% 68 -5,163 -28.01% Q1 2026 May 15, 2026
Jefferson Bridge Capital, LLC History No change 12,950 494 0.49% 0.28% 69 0 0.0% Q1 2026 May 07, 2026
Sandia Investment Management LP History No change 20,000 436 1.09% 1.09% 70 0 0.0% Q4 2025 Feb 17, 2026
FNY Investment Advisers, LLC History New 11,221 428 0.19% 71 +11,221 New Q1 2026 Apr 15, 2026
AQR CAPITAL MANAGEMENT LLC History New 11,100 423 0.0% 72 +11,100 New Q1 2026 May 15, 2026
DEUTSCHE BANK AG\ History Added to 9,444 360 0.0% 0.0% 73 +5,155 120.19% Q1 2026 May 06, 2026
TORONTO DOMINION BANK History Added to 9,100 347 0.0% 0.0% 74 +4,800 111.63% Q1 2026 May 15, 2026
ExodusPoint Capital Management, LP History New 8,794 335 0.0% 75 +8,794 New Q1 2026 May 14, 2026
Quantbot Technologies LP History New 8,619 329 0.01% 76 +8,619 New Q1 2026 May 13, 2026
Covestor Ltd History Reduced 8,507 325 0.23% 0.14% 77 -3,524 -29.29% Q1 2026 May 05, 2026
PRICE T ROWE ASSOCIATES INC /MD/ History New 7,955 304 0.0% 78 +7,955 New Q1 2026 May 15, 2026
Gem Investment Advisors, LLC History New 7,183 274 0.27% 79 +7,183 New Q1 2026 May 14, 2026
Vanguard Global Advisers, LLC History New 6,966 266 0.0% 80 +6,966 New Q1 2026 May 08, 2026
ALLIANCEBERNSTEIN L.P. History Reduced 12,130 264 0.0% 0.0% 81 -3,300 -21.39% Q1 2026 May 15, 2026
AMERICAN CENTURY COMPANIES INC History New 6,661 254 0.0% 82 +6,661 New Q1 2026 May 15, 2026
MetLife Investment Management, LLC History Reduced 6,602 252 0.0% 0.0% 83 -145 -2.15% Q1 2026 May 14, 2026
PRUDENTIAL FINANCIAL INC History New 6,457 246 0.0% 84 +6,457 New Q1 2026 May 13, 2026
Central Pacific Bank - Trust Division History No change 6,000 229 0.03% 0.02% 85 0 0.0% Q1 2026 Apr 07, 2026
WELLS FARGO & COMPANY/MN History Reduced 5,903 225 0.0% 0.0% 86 -6,469 -52.29% Q1 2026 May 11, 2026
D. E. Shaw & Co., Inc. History Reduced 5,696 217 0.0% 0.0% 87 -56,069 -90.78% Q1 2026 May 15, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History Added to 5,425 207 0.0% 0.0% 88 +211 4.05% Q1 2026 May 15, 2026
Brooklyn Investment Group History New 5,284 201 0.01% 89 +5,284 New Q1 2026 Apr 29, 2026
AlphaQuest LLC History No change 8,802 192 0.01% 0.01% 90 0 0.0% Q4 2025 Feb 09, 2026
JPMORGAN CHASE & CO History Added to 5,076 185 0.0% 0.0% 91 +403 8.62% Q1 2026 May 13, 2026
VIRTUS ADVISERS, LLC History No change 3,500 133 0.06% 0.04% 92 0 0.0% Q1 2026 May 14, 2026
Police & Firemen's Retirement System of New Jersey History No change 3,069 117 0.0% 0.0% 93 0 0.0% Q1 2026 Apr 29, 2026
ROYAL BANK OF CANADA History Added to 3,034 116 0.0% 0.0% 94 +1,826 151.16% Q1 2026 May 15, 2026
Crewe Advisors LLC History New 3,000 114 0.01% 95 +3,000 New Q1 2026 May 07, 2026
NEW YORK STATE COMMON RETIREMENT FUND History No change 2,709 103 0.0% 0.0% 96 0 0.0% Q1 2026 May 06, 2026
BNP PARIBAS FINANCIAL MARKETS History Reduced 2,477 94 0.0% 0.0% 97 -14 -0.56% Q1 2026 May 12, 2026
Legal & General Group Plc History Reduced 2,396 91 0.0% 0.0% 98 -157 -6.15% Q1 2026 May 08, 2026
BARCLAYS PLC History Reduced 2,160 82 0.0% 0.0% 99 -16,629 -88.5% Q1 2026 May 14, 2026
FIFTH THIRD BANCORP History New 1,685 64 0.0% 100 +1,685 New Q1 2026 May 01, 2026
Russell Investments Group, Ltd. History Reduced 1,134 43 0.0% 0.0% 101 -150 -11.68% Q1 2026 May 08, 2026
IFP Advisors, Inc History New 1,078 41 0.0% 102 +1,078 New Q1 2026 Apr 13, 2026
Ameritas Investment Partners, Inc. History No change 1,033 39 0.0% 0.0% 103 0 0.0% Q1 2026 May 13, 2026
Parallel Advisors, LLC History Added to 933 35 0.0% 0.0% 104 +363 63.68% Q1 2026 May 07, 2026
Tower Research Capital LLC (TRC) History Added to 856 32 0.0% 0.0% 105 +248 40.79% Q1 2026 May 15, 2026
Destiny Wealth Partners, LLC History New 775 29 0.0% 106 +775 New Q1 2026 May 11, 2026
Pinnacle Wealth Planning Services, Inc. History Added to 612 23 0.0% 0.0% 108 +308 101.32% Q1 2026 May 11, 2026
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM History Reduced 609 23 0.0% 0.0% 107 -84 -12.12% Q1 2026 May 15, 2026
Caitong International Asset Management Co., Ltd History New 568 21 0.0% 109 +568 New Q1 2026 May 11, 2026
CWM, LLC History Added to 512 19 0.0% 0.0% 110 +190 59.01% Q1 2026 May 14, 2026
SIGNATUREFD, LLC History Added to 449 17 0.0% 0.0% 111 +199 79.6% Q1 2026 Apr 07, 2026
Versant Capital Management, Inc History New 405 15 0.0% 112 +405 New Q1 2026 Apr 06, 2026
Allworth Financial LP History Added to 242 9 0.0% 0.0% 113 +45 22.84% Q1 2026 May 14, 2026
US BANCORP \DE\ History Added to 224 8 0.0% 0.0% 114 +110 96.49% Q1 2026 May 14, 2026
PNC FINANCIAL SERVICES GROUP, INC. History Added to 211 8 0.0% 0.0% 115 +18 9.33% Q1 2026 May 08, 2026
OSAIC HOLDINGS, INC. History Added to 192 7 0.0% 0.0% 117 +25 14.97% Q1 2026 May 15, 2026
NISA INVESTMENT ADVISORS, LLC History No change 203 7 0.0% 0.0% 116 0 0.0% Q1 2026 Apr 30, 2026
Private Wealth Management Group, LLC History No change 185 7 0.0% 0.0% 118 0 0.0% Q1 2026 Apr 23, 2026
Farther Finance Advisors, LLC History Added to 132 5 0.0% 0.0% 120 +9 7.32% Q1 2026 Apr 07, 2026
LOS ANGELES CAPITAL MANAGEMENT LLC History No change 141 5 0.0% 0.0% 119 0 0.0% Q1 2026 May 08, 2026
Optiver Holding B.V. History Reduced 100 3 0.0% 0.0% 121 -24 -19.35% Q1 2026 May 15, 2026
GAMMA Investing LLC History Added to 67 2 0.0% 123 +60 857.14% Q1 2026 Apr 06, 2026
Sterling Capital Management LLC History No change 73 2 0.0% 0.0% 122 0 0.0% Q1 2026 Apr 22, 2026
WPG Advisers, LLC History No change 55 2 0.0% 0.0% 124 0 0.0% Q1 2026 Apr 29, 2026
Root Financial Partners, LLC History New 47 1 0.0% 128 +47 New Q1 2026 Apr 24, 2026
FEDERATED HERMES, INC. History Added to 50 1 0.0% 125 +31 163.16% Q1 2026 May 11, 2026
MassMutual Private Wealth & Trust, FSB History No change 37 1 0.0% 126 0 0.0% Q1 2026 Apr 13, 2026
Blue Trust, Inc. History No change 27 1 0.0% 127 0 0.0% Q1 2026 Apr 20, 2026
Jefferies Financial Group Inc. History Closed out 0 0 0.05% -454,508 -100.0% Q1 2026 May 07, 2026
MARSHALL WACE, LLP History Closed out 0 0 0.01% -291,255 -100.0% Q1 2026 May 14, 2026
TUDOR INVESTMENT CORP ET AL History Closed out 0 0 0.01% -124,943 -100.0% Q1 2026 May 15, 2026
Qube Research & Technologies Ltd History Closed out 0 0 0.0% -124,646 -100.0% Q1 2026 May 15, 2026
Man Group plc History Closed out 0 0 0.0% -100,145 -100.0% Q1 2026 May 15, 2026
GSA CAPITAL PARTNERS LLP History Closed out 0 0 0.14% -72,976 -100.0% Q1 2026 May 08, 2026
SG Americas Securities, LLC History Closed out 0 0 0.0% -48,509 -100.0% Q1 2026 Apr 16, 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP History Closed out 0 0 0.0% -33,401 -100.0% Q1 2026 May 14, 2026
GABELLI & Co INVESTMENT ADVISERS, INC. History Closed out 0 0 0.1% -30,650 -100.0% Q1 2026 May 14, 2026
BALYASNY ASSET MANAGEMENT L.P. History Closed out 0 0 0.0% -17,740 -100.0% Q1 2026 May 15, 2026
EntryPoint Capital, LLC History Closed out 0 0 0.13% -15,012 -100.0% Q1 2026 May 14, 2026
XTX Topco Ltd History Closed out 0 0 0.01% -14,255 -100.0% Q1 2026 May 15, 2026
Verition Fund Management LLC History Closed out 0 0 0.0% -12,600 -100.0% Q1 2026 May 15, 2026
Aquatic Capital Management LLC History Closed out 0 0 0.01% -8,675 -100.0% Q1 2026 May 15, 2026
GROUP ONE TRADING LLC History Closed out 0 0 0.0% -6,175 -100.0% Q1 2026 May 13, 2026
AMALGAMATED BANK History Closed out 0 0 0.0% -354 -100.0% Q1 2026 May 08, 2026
Quarry LP History Closed out 0 0 0.0% -188 -100.0% Q1 2026 May 15, 2026
Arax Advisory Partners History Closed out 0 0 0.0% -89 -100.0% Q1 2026 May 13, 2026
North Star Investment Management Corp. History New 22 0 +22 New Q1 2026 Apr 23, 2026
MAI Capital Management History New 20 0 +20 New Q1 2026 May 15, 2026
Essential Partners LLC History Added to 17 0 +6 54.55% Q1 2026 May 21, 2026
EverSource Wealth Advisors, LLC History Added to 9 0 +5 125.0% Q1 2026 May 15, 2026
Sunbelt Securities, Inc. History New 3 0 +3 New Q1 2026 May 15, 2026
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC History No change 13 0 0 0.0% Q1 2026 May 13, 2026
Transamerica Financial Advisors, LLC History No change 3 0 0 0.0% Q1 2026 May 15, 2026
Trust Co History No change 12 0 0 0.0% Q1 2026 Apr 13, 2026
Global Retirement Partners, LLC History No change 9 0 0 0.0% Q4 2025 Feb 06, 2026
Hughes Financial Services, LLC History No change 2 0 0 0.0% Q1 2026 Apr 29, 2026