ANTERIX INC (ATEX) 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 June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.89B 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 $557.09M in its June 30, 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 $418.98M, representing an estimated loss of -24.79% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 74% of the total disclosed ATEX value among the investors covered in this analysis. Major shareholders include Owl Creek Asset Management, L.P., T. Rowe Price Investment Management, Inc., Heard Capital Llc, 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
170
Total Reported Value
$1.89B
Largest Holder
Owl Creek Asset Management, L.P.
Largest Position
$557.09M
Insider Transactions (90d)
32
Latest Filing Quarter
Q2 2026
New Institutional Positions
129
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. | 49.39% | 5,411,776 | $557,088,221 | $418,979,698 | -$138,108,523 | -24.79% | |
| T. Rowe Price Investment Management, Inc. | 0.16% | 2,348,019 | $241,706,000 | $181,783,631 | -$59,922,369 | -24.79% | |
| Heard Capital Llc | 7.56% | 1,716,738 | $176,721,010 | $132,909,856 | -$43,811,154 | -24.79% | |
| Blackrock, Inc. | 0.00% | 1,075,115 | $110,672,390 | $83,235,403 | -$27,436,987 | -24.79% | |
| Price T Rowe Associates Inc | 0.01% | 750,451 | $77,252,000 | $58,099,916 | -$19,152,084 | -24.79% | |
| Vanguard Capital Management Llc | 0.00% | 553,002 | $56,926,026 | $42,813,415 | -$14,112,611 | -24.79% | |
| Plustick Management Llc | 22.69% | 520,000 | $53,528,800 | $40,258,400 | -$13,270,400 | -24.79% | |
| State Street Corp | 0.00% | 495,950 | $51,053,093 | $38,396,449 | -$12,656,644 | -24.79% | |
| Gamco Investors, Inc. Et Al | 0.38% | 415,520 | $42,773,629 | $32,169,558 | -$10,604,071 | -24.79% | |
| Geode Capital Management, Llc | 0.00% | 388,076 | $39,960,985 | $30,044,844 | -$9,916,141 | -24.81% | |
| Qvt Financial Lp | 2.53% | 383,941 | $39,522,887 | $29,724,712 | -$9,798,175 | -24.79% | |
| Dimensional Fund Advisors Lp | 0.01% | 370,964 | $38,180,690 | $28,720,033 | -$9,460,657 | -24.78% | |
| Fmr Llc | 0.00% | 370,400 | $38,128,992 | $28,676,368 | -$9,452,624 | -24.79% | |
| Gabelli Funds Llc | 0.18% | 278,500 | $28,668,790 | $21,561,470 | -$7,107,320 | -24.79% | |
| Invesco Ltd. | 0.00% | 200,975 | $20,688,367 | $15,559,485 | -$5,128,883 | -24.79% | |
| Vanguard Portfolio Management Llc | 0.00% | 158,469 | $16,312,799 | $12,268,670 | -$4,044,129 | -24.79% | |
| Garnet Equity Capital Holdings, Inc. | 7.20% | 156,119 | $16,070,890 | $12,086,733 | -$3,984,157 | -24.79% | |
| Potomac Capital Management, Inc. | 11.68% | 155,071 | $15,963,009 | $12,005,597 | -$3,957,412 | -24.79% | |
| Panoramic Capital, Llc | 6.84% | 154,377 | $15,891,568 | $11,951,867 | -$3,939,701 | -24.79% | |
| Goldman Sachs Group Inc | 0.00% | 139,334 | $14,342,994 | $10,787,238 | -$3,555,756 | -24.79% | |
| Charles Schwab Investment Management Inc | 0.00% | 139,278 | $14,337,277 | $10,782,903 | -$3,554,374 | -24.79% | |
| Bank Of America Corp | 0.00% | 134,686 | $13,864,577 | $10,427,390 | -$3,437,187 | -24.79% | |
| Northern Trust Corp | 0.00% | 123,231 | $12,685,400 | $9,540,544 | -$3,144,856 | -24.79% | |
| Vanguard Fiduciary Trust Co | 0.00% | 120,999 | $12,455,637 | $9,367,743 | -$3,087,894 | -24.79% | |
| Kirr Marbach & Co Llc | 2.01% | 116,069 | $11,948,143 | $8,986,062 | -$2,962,081 | -24.79% | |
| D. E. Shaw & Co., Inc. | 0.01% | 92,990 | $9,572,391 | $7,199,286 | -$2,373,105 | -24.79% | |
| Morgan Stanley | 0.00% | 80,425 | $8,278,957 | $6,226,504 | -$2,052,454 | -24.79% | |
| Openarc Corporate Advisory, Llc | 0.09% | 75,576 | $7,779,793 | $5,851,094 | -$1,928,699 | -24.79% | |
| Beartown Capital Management, Llc | 3.43% | 75,000 | $7,720,500 | $5,806,500 | -$1,914,000 | -24.79% | |
| Granahan Investment Management, Llc | 0.26% | 72,121 | $7,424,136 | $5,583,608 | -$1,840,528 | -24.79% | |
| Bank Of New York Mellon Corp | 0.00% | 69,374 | $7,141,361 | $5,370,935 | -$1,770,426 | -24.79% | |
| Marble Bar Asset Management Llp | 4.87% | 68,248 | $7,025,449 | $5,283,760 | -$1,741,689 | -24.79% | |
| 683 Capital Management, Llc | 0.62% | 66,000 | $6,794,040 | $5,109,720 | -$1,684,320 | -24.79% | |
| Citigroup Inc | 0.00% | 59,998 | $6,176,194 | $4,645,045 | -$1,531,149 | -24.79% | |
| Trexquant Investment Lp | 0.03% | 53,423 | $5,499,364 | $4,136,009 | -$1,363,355 | -24.79% | |
| Td Asset Management Inc | 0.00% | 53,258 | $5,482,379 | $4,123,234 | -$1,359,145 | -24.79% | |
| Informed Momentum Co Llc | 0.48% | 52,534 | $5,407,850 | $4,067,182 | -$1,340,668 | -24.79% | |
| Potrero Capital Research Llc | 2.93% | 46,525 | $4,789,284 | $3,601,966 | -$1,187,319 | -24.79% | |
| Teton Advisors, Llc | 2.56% | 43,000 | $4,426,420 | $3,329,060 | -$1,097,360 | -24.79% | |
| Nuveen, Llc | 0.00% | 35,798 | $3,685,047 | $2,771,481 | -$913,566 | -24.79% | |
| Gilder Gagnon Howe & Co Llc | 0.03% | 32,833 | $3,379,829 | $2,541,931 | -$837,898 | -24.79% | |
| Wellington Management Group Llp | 0.00% | 31,006 | $3,191,758 | $2,400,485 | -$791,273 | -24.79% | |
| Hrt Financial Lp | 0.01% | 30,673 | $3,157,000 | $2,374,704 | -$782,296 | -24.78% | |
| Millennium Management Llc | 0.00% | 30,340 | $3,123,200 | $2,348,923 | -$774,277 | -24.79% | |
| Evr Research Lp | 1.27% | 25,000 | $2,573,500 | $1,935,500 | -$638,000 | -24.79% | |
| Ubs Group Ag | 0.00% | 24,018 | $2,472,413 | $1,859,474 | -$612,939 | -24.79% | |
| Campbell & Co Investment Adviser Llc | 0.11% | 21,084 | $2,170,387 | $1,632,323 | -$538,064 | -24.79% | |
| Harbor Capital Advisors, Inc. | 0.15% | 20,805 | $2,142,000 | $1,610,723 | -$531,277 | -24.80% | |
| Hanseatic Management Services Inc | 1.39% | 18,418 | $1,895,948 | $1,425,922 | -$470,026 | -24.79% | |
| Caption Management, Llc | 0.06% | 17,532 | $1,804,744 | $1,357,327 | -$447,417 | -24.79% |
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.