ATEX Institutional Ownership & Shareholders
ANTERIX INC (ATEX) is currently held by 170 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $1.88B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
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 $444.90M, representing an estimated loss of -20.14% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 75% 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
$1.88B
Largest Holder
Owl Creek Asset Management, L.P.
Largest Position
$557.09M
Insider Transactions (90d)
39
Latest Filing Quarter
Q2 2026
New Institutional Positions
110
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 | $444,902,105 | -$112,186,116 | -20.14% | |
| T. Rowe Price Investment Management, Inc. | 0.16% | 2,348,019 | $241,706,000 | $193,030,642 | -$48,675,358 | -20.14% | |
| Heard Capital Llc | 7.56% | 1,716,738 | $176,721,010 | $141,133,031 | -$35,587,979 | -20.14% | |
| Blackrock, Inc. | 0.00% | 1,075,115 | $110,672,390 | $88,385,204 | -$22,287,186 | -20.14% | |
| Price T Rowe Associates Inc | 0.01% | 750,451 | $77,252,000 | $61,694,577 | -$15,557,423 | -20.14% | |
| Vanguard Capital Management Llc | 0.00% | 553,002 | $56,926,026 | $45,462,294 | -$11,463,732 | -20.14% | |
| Plustick Management Llc | 22.69% | 520,000 | $53,528,800 | $42,749,200 | -$10,779,600 | -20.14% | |
| State Street Corp | 0.00% | 495,950 | $51,053,093 | $40,772,050 | -$10,281,044 | -20.14% | |
| Gamco Investors, Inc. Et Al | 0.38% | 415,520 | $42,773,629 | $34,159,899 | -$8,613,730 | -20.14% | |
| Geode Capital Management, Llc | 0.00% | 388,076 | $39,960,985 | $31,903,728 | -$8,057,257 | -20.16% | |
| Qvt Financial Lp | 2.53% | 383,941 | $39,522,887 | $31,563,790 | -$7,959,097 | -20.14% | |
| Dimensional Fund Advisors Lp | 0.01% | 370,964 | $38,180,690 | $30,496,950 | -$7,683,740 | -20.12% | |
| Fmr Llc | 0.00% | 370,400 | $38,128,992 | $30,450,584 | -$7,678,408 | -20.14% | |
| Gabelli Funds Llc | 0.18% | 278,500 | $28,668,790 | $22,895,485 | -$5,773,305 | -20.14% | |
| Invesco Ltd. | 0.00% | 200,975 | $20,688,367 | $16,522,155 | -$4,166,212 | -20.14% | |
| Vanguard Portfolio Management Llc | 0.00% | 158,469 | $16,312,799 | $13,027,736 | -$3,285,063 | -20.14% | |
| Garnet Equity Capital Holdings, Inc. | 7.20% | 156,119 | $16,070,890 | $12,834,543 | -$3,236,347 | -20.14% | |
| Potomac Capital Management, Inc. | 11.68% | 155,071 | $15,963,009 | $12,748,387 | -$3,214,622 | -20.14% | |
| Panoramic Capital, Llc | 6.84% | 154,377 | $15,891,568 | $12,691,333 | -$3,200,235 | -20.14% | |
| Goldman Sachs Group Inc | 0.00% | 139,334 | $14,342,994 | $11,454,648 | -$2,888,346 | -20.14% | |
| Charles Schwab Investment Management Inc | 0.00% | 139,278 | $14,337,277 | $11,450,044 | -$2,887,233 | -20.14% | |
| Bank Of America Corp | 0.00% | 134,686 | $13,864,577 | $11,072,536 | -$2,792,041 | -20.14% | |
| Northern Trust Corp | 0.00% | 123,231 | $12,685,400 | $10,130,821 | -$2,554,579 | -20.14% | |
| Vanguard Fiduciary Trust Co | 0.00% | 120,999 | $12,455,637 | $9,947,328 | -$2,508,309 | -20.14% | |
| D. E. Shaw & Co., Inc. | 0.01% | 92,990 | $9,572,391 | $7,644,708 | -$1,927,683 | -20.14% | |
| Kirr Marbach & Co Llc | 1.73% | 116,554 | $9,149,489 | $9,581,904 | +$432,415 | +4.73% | |
| Morgan Stanley | 0.00% | 80,425 | $8,278,957 | $6,611,739 | -$1,667,218 | -20.14% | |
| Beartown Capital Management, Llc | 3.43% | 75,000 | $7,720,500 | $6,165,750 | -$1,554,750 | -20.14% | |
| Granahan Investment Management, Llc | 0.26% | 72,121 | $7,424,136 | $5,929,067 | -$1,495,069 | -20.14% | |
| Bank Of New York Mellon Corp | 0.00% | 69,374 | $7,141,361 | $5,703,237 | -$1,438,124 | -20.14% | |
| Marble Bar Asset Management Llp | 4.87% | 68,248 | $7,025,449 | $5,610,668 | -$1,414,781 | -20.14% | |
| 683 Capital Management, Llc | 0.62% | 66,000 | $6,794,040 | $5,425,860 | -$1,368,180 | -20.14% | |
| Citigroup Inc | 0.00% | 59,998 | $6,176,194 | $4,932,436 | -$1,243,758 | -20.14% | |
| Trexquant Investment Lp | 0.03% | 53,423 | $5,499,364 | $4,391,905 | -$1,107,459 | -20.14% | |
| Td Asset Management Inc | 0.00% | 53,258 | $5,482,379 | $4,378,340 | -$1,104,039 | -20.14% | |
| Informed Momentum Co Llc | 0.48% | 52,534 | $5,407,850 | $4,318,820 | -$1,089,030 | -20.14% | |
| Potrero Capital Research Llc | 2.93% | 46,525 | $4,789,284 | $3,824,820 | -$964,464 | -20.14% | |
| Teton Advisors, Llc | 2.56% | 43,000 | $4,426,420 | $3,535,030 | -$891,390 | -20.14% | |
| Nuveen, Llc | 0.00% | 35,798 | $3,685,047 | $2,942,954 | -$742,093 | -20.14% | |
| Gilder Gagnon Howe & Co Llc | 0.03% | 32,833 | $3,379,829 | $2,699,201 | -$680,628 | -20.14% | |
| Wellington Management Group Llp | 0.00% | 31,006 | $3,191,758 | $2,549,003 | -$642,755 | -20.14% | |
| Hrt Financial Lp | 0.01% | 30,673 | $3,157,000 | $2,521,627 | -$635,373 | -20.13% | |
| Millennium Management Llc | 0.00% | 30,340 | $3,123,200 | $2,494,251 | -$628,949 | -20.14% | |
| Creative Planning | 0.00% | 34,978 | $2,745,773 | $2,875,541 | +$129,768 | +4.73% | |
| Evr Research Lp | 1.27% | 25,000 | $2,573,500 | $2,055,250 | -$518,250 | -20.14% | |
| Ubs Group Ag | 0.00% | 24,018 | $2,472,413 | $1,974,520 | -$497,893 | -20.14% | |
| Campbell & Co Investment Adviser Llc | 0.11% | 21,084 | $2,170,387 | $1,733,316 | -$437,071 | -20.14% | |
| Principal Financial Group Inc | 0.00% | 23,132 | $1,815,863 | $1,901,682 | +$85,819 | +4.73% | |
| Caption Management, Llc | 0.06% | 17,532 | $1,804,744 | $1,441,306 | -$363,438 | -20.14% | |
| Jane Street Group, Llc | 0.00% | 17,506 | $1,802,068 | $1,439,168 | -$362,900 | -20.14% |
Frequently asked questions about ATEX
Who are the largest institutional holders of ATEX?
The largest institutional holders of ATEX reported in the latest SEC Form 13F filings include Owl Creek Asset Management, L.P., T. Rowe Price Investment Management, Inc., Heard Capital Llc, Blackrock, Inc., and Price T Rowe Associates Inc. InsiderSet ranks institutional holders by their latest reported ATEX position.
What is ATEX institutional ownership?
This page tracks ATEX positions reported by institutional investment managers through SEC Form 13F. ANTERIX INC (ATEX) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ATEX?
InsiderSet currently tracks 170 institutional managers reporting ATEX holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ATEX shareholders.
How much ATEX stock do institutions own?
Institutional investment managers disclosed approximately $1.88B in ATEX holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ATEX institutional ownership last updated?
The latest ATEX institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ATEX holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ATEX position after the reporting date.
Are institutions buying or selling ATEX?
Institutional buying and selling can be analyzed by comparing ATEX positions across consecutive 13F reporting periods. InsiderSet's ATEX Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ATEX ownership changes.
How has ATEX institutional ownership changed over time?
InsiderSet tracks ATEX institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.