ANTERIX INC (ATEX) Top Institutional Shareholders
ANTERIX INC (ATEX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $637.88M in ATEX holdings during the latest filing period.
Owl Creek Asset Management, L.P. is currently the largest disclosed institutional shareholder of ATEX tracked by InsiderSet, reporting ownership valued at approximately $206.68M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $428.40M, representing an estimated gain of +107.28% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 68% of the total disclosed ATEX value among the investors covered in this analysis. Major shareholders include Owl Creek Asset Management, L.P., Heard Capital Llc, Blackrock, Inc., and several other long-term asset managers with concentrated positions in ANTERIX INC (ATEX).
This page ranks the largest institutional ATEX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
130
Total Reported Value
$637.88M
Largest Holder
Owl Creek Asset Management, L.P.
Largest Position
$206.68M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
152
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Owl Creek Asset Management, L.P. | 39.93% | 5,411,776 | $206,675,725 | $428,396,188 | +$221,720,463 | +107.28% | |
| Heard Capital Llc | 3.39% | 1,716,738 | $65,562,224 | $135,896,980 | +$70,334,756 | +107.28% | |
| Blackrock, Inc. | 0.00% | 1,007,143 | $38,462,810 | $79,725,440 | +$41,262,630 | +107.28% | |
| Vanguard Capital Management Llc | 0.00% | 573,847 | $21,915,217 | $45,425,729 | +$23,510,512 | +107.28% | |
| Qvt Financial Lp | 1.52% | 503,941 | $19,245,507 | $39,891,970 | +$20,646,463 | +107.28% | |
| Plustick Management Llc | 10.16% | 499,596 | $19,079,571 | $39,548,019 | +$20,468,448 | +107.28% | |
| Gamco Investors, Inc. Et Al | 0.16% | 425,820 | $16,262,066 | $33,707,911 | +$17,445,845 | +107.28% | |
| Dimensional Fund Advisors Lp | 0.00% | 424,856 | $16,222,641 | $33,631,601 | +$17,408,960 | +107.31% | |
| Jane Street Group, Llc | 0.02% | 420,857 | $16,072,529 | $33,315,040 | +$17,242,511 | +107.28% | |
| State Street Corp | 0.00% | 387,918 | $14,814,588 | $30,707,589 | +$15,893,001 | +107.28% | |
| Geode Capital Management, Llc | 0.00% | 374,301 | $14,299,259 | $29,629,667 | +$15,330,408 | +107.21% | |
| Garnet Equity Capital Holdings, Inc. | 7.45% | 343,496 | $13,118,112 | $27,191,143 | +$14,073,031 | +107.28% | |
| Millennium Management Llc | 0.01% | 307,922 | $11,759,541 | $24,375,106 | +$12,615,565 | +107.28% | |
| Gabelli Funds Llc | 0.07% | 265,800 | $10,150,902 | $21,040,728 | +$10,889,826 | +107.28% | |
| Potrero Capital Research Llc | 5.38% | 229,561 | $8,766,935 | $18,172,049 | +$9,405,114 | +107.28% | |
| Ayal Capital Advisors Ltd | 3.85% | 197,119 | $7,527,975 | $15,603,940 | +$8,075,965 | +107.28% | |
| Potomac Capital Management, Inc. | 5.80% | 173,802 | $6,637,498 | $13,758,166 | +$7,120,668 | +107.28% | |
| Dg Capital Management, Llc | 2.78% | 168,217 | $6,424,207 | $13,316,058 | +$6,891,851 | +107.28% | |
| Bank Of America Corp | 0.00% | 167,781 | $6,407,556 | $13,281,544 | +$6,873,988 | +107.28% | |
| Vanguard Portfolio Management Llc | 0.00% | 164,542 | $6,283,859 | $13,025,145 | +$6,741,286 | +107.28% | |
| Goldman Sachs Group Inc | 0.00% | 161,786 | $6,178,607 | $12,806,980 | +$6,628,373 | +107.28% | |
| Citadel Advisors Llc | 0.00% | 161,163 | $6,154,815 | $12,757,663 | +$6,602,848 | +107.28% | |
| Charles Schwab Investment Management Inc | 0.00% | 141,388 | $5,399,608 | $11,192,274 | +$5,792,666 | +107.28% | |
| Fmr Llc | 0.00% | 135,295 | $5,166,931 | $10,709,952 | +$5,543,021 | +107.28% | |
| Panoramic Capital, Llc | 3.62% | 135,000 | $5,155,650 | $10,686,600 | +$5,530,950 | +107.28% | |
| Centerbook Partners Lp | 0.26% | 127,674 | $4,875,870 | $10,106,674 | +$5,230,804 | +107.28% | |
| Citigroup Inc | 0.00% | 119,861 | $4,577,491 | $9,488,197 | +$4,910,706 | +107.28% | |
| Vanguard Fiduciary Trust Co | 0.00% | 119,456 | $4,562,025 | $9,456,137 | +$4,894,112 | +107.28% | |
| Northern Trust Corp | 0.00% | 117,610 | $4,491,526 | $9,310,008 | +$4,818,482 | +107.28% | |
| Kirr Marbach & Co Llc | 0.79% | 113,814 | $4,346,557 | $9,009,516 | +$4,662,959 | +107.28% | |
| Ardsley Advisory Partners Lp | 0.64% | 110,000 | $4,200,900 | $8,707,600 | +$4,506,700 | +107.28% | |
| Morgan Stanley | 0.00% | 102,658 | $3,920,510 | $8,126,407 | +$4,205,897 | +107.28% | |
| Beartown Capital Management, Llc | 3.04% | 100,000 | $3,819,000 | $7,916,000 | +$4,097,000 | +107.28% | |
| Gratia Capital, Llc | 3.16% | 87,500 | $3,341,625 | $6,926,500 | +$3,584,875 | +107.28% | |
| Atom Investors Lp | 0.23% | 84,179 | $3,214,796 | $6,663,610 | +$3,448,814 | +107.28% | |
| Openarc Corporate Advisory, Llc | 0.04% | 73,848 | $2,820,255 | $5,845,808 | +$3,025,553 | +107.28% | |
| Bank Of New York Mellon Corp | 0.00% | 67,836 | $2,590,657 | $5,369,898 | +$2,779,241 | +107.28% | |
| Waterfront Wealth Inc. | 0.42% | 59,955 | $2,289,681 | $4,746,038 | +$2,456,357 | +107.28% | |
| Squarepoint Ops Llc | 0.00% | 59,736 | $2,281,318 | $4,728,702 | +$2,447,384 | +107.28% | |
| Marble Bar Asset Management Llp | 2.01% | 53,509 | $2,043,509 | $4,235,772 | +$2,192,263 | +107.28% | |
| Teton Advisors, Llc | 1.42% | 53,000 | $2,024,070 | $4,195,480 | +$2,171,410 | +107.28% | |
| Resolute Capital Asset Partners Llc | 1.03% | 51,106 | $1,951,738 | $4,045,551 | +$2,093,813 | +107.28% | |
| Ubs Group Ag | 0.00% | 47,875 | $1,828,346 | $3,789,785 | +$1,961,439 | +107.28% | |
| 683 Capital Management, Llc | 0.16% | 46,000 | $1,756,740 | $3,641,360 | +$1,884,620 | +107.28% | |
| Simplex Trading, Llc | 0.05% | 43,750 | $1,670,812 | $3,463,250 | +$1,792,438 | +107.28% | |
| Campbell & Co Investment Adviser Llc | 0.09% | 40,460 | $1,545,167 | $3,202,814 | +$1,657,647 | +107.28% | |
| Trexquant Investment Lp | 0.01% | 40,175 | $1,534,283 | $3,180,253 | +$1,645,970 | +107.28% | |
| Susquehanna International Group, Llp | 0.00% | 39,798 | $1,519,886 | $3,150,410 | +$1,630,524 | +107.28% | |
| Creative Planning | 0.00% | 31,964 | $1,220,705 | $2,530,270 | +$1,309,565 | +107.28% | |
| Imc-Chicago, Llc | 0.02% | 30,363 | $1,159,563 | $2,403,535 | +$1,243,972 | +107.28% |
Frequently asked questions about ATEX
Who owns the most ATEX stock?
The largest holders of ATEX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ANTERIX INC (ATEX).
Is ATEX widely held by superinvestors?
Many widely followed stocks like ATEX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ATEX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.