Who owns ATEX
Which tracked institutional funds hold ATEX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATEX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on ATEX is one-sided between 2026-Q1 and 2026-Q2: 80 added or opened and 22 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ATEX’s largest tracked holder by dollar value, Owl Creek Asset Management, L.P., sizes it at 49.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 49.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ATEX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 166 tracked filers holding ATEX, 99 increased or opened the position and 68 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ATEX between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 20
- Jupiter Topco LLC$68M
- Invesco Ltd.$21M
- Granahan Investment Management, LLC$7M
- TD Asset Management Inc$5M
- Informed Momentum Co LLC$5M
- GILDER GAGNON HOWE & CO LLC$3M
Full exits 10
- AYAL Capital Advisors Ltd$8M
- HRT FINANCIAL LP$7M
- DG Capital Management, LLC$6M
- ARDSLEY ADVISORY PARTNERS LP$4M
- GRATIA CAPITAL, LLC$3M
- Squarepoint Ops LLC$2M
Largest adds
- Owl Creek Asset Management, L.P.$350M
- Heard Capital LLC$111M
- PRICE T ROWE ASSOCIATES INC /MD/$77M
- BlackRock, Inc.$72M
- STATE STREET CORP$36M
- VANGUARD CAPITAL MANAGEMENT LLC$35M
Largest trims
- JANE STREET GROUP, LLC$14M
- MILLENNIUM MANAGEMENT LLC$9M
- CenterBook Partners LP$4M
- Potrero Capital Research LLC$4M
- CITADEL ADVISORS LLC$4M
- Atom Investors LP$3M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Owl Creek Asset Management, L.P. | 5,411,776 | $557M | 32.6% | 2026-Q2 |
| Heard Capital LLC | 1,716,738 | $177M | 10.3% | 2026-Q2 |
| BlackRock, Inc. added | 1,075,115 | $111M | 6.5% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 750,451 | $77M | 4.5% | 2026-Q2 |
| Jupiter Topco LLC new | 662,415 | $68M | 4.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 553,002 | $57M | 3.3% | 2026-Q2 |
| PLUSTICK MANAGEMENT LLC added | 520,000 | $54M | 3.1% | 2026-Q2 |
| STATE STREET CORP added | 495,950 | $51M | 3.0% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL trimmed | 415,520 | $43M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 388,076 | $40M | 2.3% | 2026-Q2 |
| QVT Financial LP trimmed | 383,941 | $40M | 2.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 370,964 | $38M | 2.2% | 2026-Q2 |
| FMR LLC added | 370,400 | $38M | 2.2% | 2026-Q2 |
| GABELLI FUNDS LLC added | 278,500 | $29M | 1.7% | 2026-Q2 |
| Invesco Ltd. new | 200,975 | $21M | 1.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 158,469 | $16M | 1.0% | 2026-Q2 |
| GARNET EQUITY CAPITAL HOLDINGS, INC. trimmed | 156,119 | $16M | 0.9% | 2026-Q2 |
| Potomac Capital Management, Inc. trimmed | 155,071 | $16M | 0.9% | 2026-Q2 |
| Panoramic Capital, LLC added | 154,377 | $16M | 0.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 139,334 | $14M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 139,278 | $14M | 0.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 134,686 | $14M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 123,231 | $13M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 120,999 | $12M | 0.7% | 2026-Q2 |
| KIRR MARBACH & CO LLC /IN/ added | 116,069 | $12M | 0.7% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 92,990 | $10M | 0.6% | 2026-Q2 |
| MORGAN STANLEY trimmed | 80,425 | $8M | 0.5% | 2026-Q2 |
| OpenArc Corporate Advisory, LLC added | 75,576 | $8M | 0.5% | 2026-Q2 |
| Beartown Capital Management, LLC trimmed | 75,000 | $8M | 0.5% | 2026-Q2 |
| Granahan Investment Management, LLC new | 72,121 | $7M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 69,374 | $7M | 0.4% | 2026-Q2 |
| Marble Bar Asset Management LLP added | 68,248 | $7M | 0.4% | 2026-Q2 |
| 683 Capital Management, LLC added | 66,000 | $7M | 0.4% | 2026-Q2 |
| CITIGROUP INC trimmed | 59,998 | $6M | 0.4% | 2026-Q2 |
| Trexquant Investment LP added | 53,423 | $5M | 0.3% | 2026-Q2 |
| TD Asset Management Inc new | 53,258 | $5M | 0.3% | 2026-Q2 |
| Informed Momentum Co LLC new | 52,534 | $5M | 0.3% | 2026-Q2 |
| Potrero Capital Research LLC trimmed | 46,525 | $5M | 0.3% | 2026-Q2 |
| Teton Advisors, LLC trimmed | 43,000 | $4M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 35,798 | $4M | 0.2% | 2026-Q2 |
| Creative Planning added | 34,541 | $4M | 0.2% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC new | 32,833 | $3M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP new | 31,006 | $3M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 30,340 | $3M | 0.2% | 2026-Q2 |
| EVR Research LP new | 25,000 | $3M | 0.2% | 2026-Q2 |
| UBS Group AG trimmed | 24,018 | $2M | 0.1% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC trimmed | 21,084 | $2M | 0.1% | 2026-Q2 |
| HANSEATIC MANAGEMENT SERVICES INC new | 18,418 | $2M | 0.1% | 2026-Q2 |
| Caption Management, LLC added | 17,532 | $2M | 0.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 17,506 | $2M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 17,229 | $2M | 0.1% | 2026-Q2 |
| WOODMONT INVESTMENT COUNSEL LLC trimmed | 16,973 | $2M | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 16,489 | $2M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 16,070 | $2M | 0.1% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 15,731 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 15,643 | $2M | 0.1% | 2026-Q2 |
| TORONTO DOMINION BANK added | 15,600 | $2M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 14,648 | $2M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 14,337 | $1M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 13,437 | $1M | 0.1% | 2026-Q2 |
| CAXTON ASSOCIATES LLP new | 13,432 | $1M | 0.1% | 2026-Q2 |
| GWN SECURITIES INC. trimmed | 13,425 | $1M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 13,330 | $509K | 0.0% | 2026-Q2 |
| Quadrature Capital Ltd trimmed | 12,979 | $1M | 0.1% | 2026-Q2 |
| Jefferson Bridge Capital, LLC | 12,950 | $1M | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 12,353 | $1M | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 10,841 | $1M | 0.1% | 2026-Q2 |
| FCG Investment Co new | 10,762 | $1M | 0.1% | 2026-Q2 |
| Waterfront Wealth Inc. trimmed | 10,714 | $1M | 0.1% | 2026-Q2 |
| Numerai GP LLC new | 10,271 | $1M | 0.1% | 2026-Q2 |
| STRS OHIO trimmed | 9,800 | $1M | 0.1% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 9,014 | $928K | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC new | 8,867 | $913K | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 8,582 | $883K | 0.1% | 2026-Q2 |
| Gem Investment Advisors, LLC | 7,183 | $739K | 0.0% | 2026-Q2 |
| CenterBook Partners LP trimmed | 6,877 | $708K | 0.0% | 2026-Q2 |
| MetLife Investment Management, LLC added | 6,651 | $685K | 0.0% | 2026-Q2 |
| Inspire Investing, LLC trimmed | 6,604 | $680K | 0.0% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP new | 6,562 | $675K | 0.0% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 6,532 | $672K | 0.0% | 2026-Q2 |
| Aster Capital Management (DIFC) Ltd new | 6,100 | $628K | 0.0% | 2026-Q2 |
| Central Pacific Bank - Trust Division | 6,000 | $618K | 0.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 5,584 | $575K | 0.0% | 2026-Q2 |
| FIRST TRUST ADVISORS LP new | 5,578 | $574K | 0.0% | 2026-Q2 |
| SIMPLEX TRADING, LLC trimmed | 5,377 | $554K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 5,290 | $545K | 0.0% | 2026-Q2 |
| Cornerstone Investment Partners, LLC new | 4,866 | $501K | 0.0% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP new | 4,720 | $486K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 4,509 | $464K | 0.0% | 2026-Q2 |
| Baader Bank Aktiengesellschaft new | 4,500 | $463K | 0.0% | 2026-Q2 |
| Aquatic Capital Management LLC trimmed | 4,299 | $443K | 0.0% | 2026-Q2 |
| Atom Investors LP trimmed | 4,124 | $425K | 0.0% | 2026-Q2 |
| Brevan Howard Capital Management LP new | 4,028 | $415K | 0.0% | 2026-Q2 |
| MIRABELLA FINANCIAL SERVICES LLP new | 4,025 | $414K | 0.0% | 2026-Q2 |
| VIRTUS ADVISERS, LLC added | 3,976 | $409K | 0.0% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM new | 3,975 | $409K | 0.0% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 3,757 | $387K | 0.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP new | 3,716 | $383K | 0.0% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD new | 3,700 | $381K | 0.0% | 2026-Q2 |
| AVIVA PLC new | 3,644 | $375K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.