Who owns ATAT
Which tracked institutional funds hold ATAT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATAT 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
48 tracked funds added or opened ATAT while 77 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
ATAT’s largest tracked holder by dollar value, OLP CAPITAL MANAGEMENT Ltd, sizes it at 61.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 61.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ATAT 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 170 tracked filers holding ATAT, 98 increased or opened the position and 98 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 ATAT 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 9
- Capital World Investors$58M
- BRIGHT VALLEY CAPITAL Ltd$32M
- Connor, Clark & Lunn Investment Management Ltd.$7M
- Taikang Asset Management (Hong Kong) Co Ltd$2M
- Channing Global Advisors, LLC$2M
- Walleye Capital LLC$2M
Full exits 25
- WFM ASIA (BVI) Ltd$135M
- Aspex Management (HK) Ltd$131M
- PRINCIPAL FINANCIAL GROUP INC$36M
- Cederberg Capital Ltd$33M
- SG Americas Securities, LLC$21M
- Capital Wealth Planning, LLC$14M
Largest adds
- NORGES BANK$84M
- M&G PLC$42M
- JUPITER ASSET MANAGEMENT LTD$39M
- Temasek Holdings (Private) Ltd$31M
- LAZARD ASSET MANAGEMENT LLC$29M
- Green Court Capital Management Ltd$27M
Largest trims
- BANK OF AMERICA CORP /DE/$66M
- FMR LLC$60M
- OLP CAPITAL MANAGEMENT Ltd$53M
- UBS Group AG$43M
- Greenwoods Asset Management Hong Kong Ltd.$39M
- GOLDMAN SACHS GROUP INC$22M
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 |
|---|---|---|---|---|
| OLP CAPITAL MANAGEMENT Ltd trimmed | 7,714,695 | $245M | 10.4% | 2026-Q2 |
| M&G PLC added | 4,567,124 | $146M | 6.2% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 4,456,326 | $144M | 6.1% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 4,088,869 | $132M | 5.6% | 2026-Q2 |
| NORGES BANK added | 4,029,737 | $128M | 5.5% | 2026-Q2 |
| FMR LLC trimmed | 3,765,242 | $120M | 5.1% | 2026-Q2 |
| Mitsubishi UFJ Trust & Banking Corp added | 2,818,973 | $90M | 3.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,302,456 | $73M | 3.1% | 2026-Q2 |
| BlackRock, Inc. added | 2,059,908 | $66M | 2.8% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,883,024 | $60M | 2.5% | 2026-Q2 |
| Capital World Investors new | 1,820,533 | $58M | 2.5% | 2026-Q2 |
| Greenwoods Asset Management Hong Kong Ltd. trimmed | 1,788,400 | $57M | 2.4% | 2026-Q2 |
| Man Group plc added | 1,572,931 | $50M | 2.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 1,419,824 | $45M | 1.9% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD added | 1,289,400 | $41M | 1.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,164,514 | $37M | 1.6% | 2026-Q2 |
| Green Court Capital Management Ltd added | 1,077,517 | $34M | 1.5% | 2026-Q2 |
| Temasek Holdings (Private) Ltd added | 1,076,555 | $34M | 1.5% | 2026-Q2 |
| BRIGHT VALLEY CAPITAL Ltd added | 1,017,508 | $32M | 1.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 1,002,701 | $32M | 1.4% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 999,312 | $32M | 1.4% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 995,317 | $32M | 1.3% | 2026-Q2 |
| MORGAN STANLEY added | 849,222 | $27M | 1.1% | 2026-Q2 |
| PRUDENTIAL PLC added | 845,627 | $27M | 1.1% | 2026-Q2 |
| Aberdeen Group plc added | 833,325 | $26M | 1.1% | 2026-Q2 |
| Broad Peak Investment Advisers Pte Ltd | 806,000 | $26M | 1.1% | 2026-Q2 |
| Mawer Investment Management Ltd. added | 752,258 | $24M | 1.0% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 730,668 | $23M | 1.0% | 2026-Q2 |
| OVERSEA-CHINESE BANKING Corp Ltd added | 678,683 | $22M | 0.9% | 2026-Q2 |
| Triata Capital Ltd added | 677,712 | $22M | 0.9% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 651,527 | $21M | 0.9% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 628,210 | $20M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 598,448 | $19M | 0.8% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 584,986 | $19M | 0.8% | 2026-Q2 |
| Public Sector Pension Investment Board added | 552,178 | $18M | 0.7% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 538,128 | $17M | 0.7% | 2026-Q2 |
| Think Investments LP trimmed | 536,289 | $17M | 0.7% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 501,002 | $18M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp added | 452,058 | $14M | 0.6% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 450,727 | $14M | 0.6% | 2026-Q2 |
| E Fund Management Co., Ltd. trimmed | 430,000 | $14M | 0.6% | 2026-Q2 |
| California Public Employees Retirement System added | 407,898 | $13M | 0.6% | 2026-Q2 |
| MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC added | 350,616 | $11M | 0.5% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 348,174 | $11M | 0.5% | 2026-Q2 |
| ABN AMRO INVESTMENT SOLUTIONS added | 338,060 | $11M | 0.5% | 2026-Q2 |
| DYMON ASIA CAPITAL (SINGAPORE) PTE. LTD. added | 326,774 | $10M | 0.4% | 2026-Q2 |
| Trexquant Investment LP trimmed | 319,917 | $10M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 317,663 | $10M | 0.4% | 2026-Q2 |
| Lighthouse Investment Partners, LLC added | 314,256 | $10M | 0.4% | 2026-Q2 |
| AI-Squared Management Ltd added | 301,984 | $10M | 0.4% | 2026-Q2 |
| CITIGROUP INC added | 292,627 | $9M | 0.4% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 276,300 | $9M | 0.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 273,781 | $9M | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 267,985 | $9M | 0.4% | 2026-Q2 |
| FACT Capital, LP | 253,421 | $8M | 0.3% | 2026-Q2 |
| FIL Ltd added | 239,944 | $8M | 0.3% | 2026-Q2 |
| Vontobel Holding Ltd. added | 227,017 | $7M | 0.3% | 2026-Q2 |
| AIA Group Ltd added | 225,467 | $7M | 0.3% | 2026-Q2 |
| SERENITY CAPITAL MANAGEMENT PTE. LTD. | 215,000 | $7M | 0.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. new | 212,106 | $7M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 206,467 | $7M | 0.3% | 2026-Q2 |
| STATE STREET CORP trimmed | 192,694 | $6M | 0.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 171,799 | $5M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 171,319 | $5M | 0.2% | 2026-Q2 |
| LMR Partners LLP added | 159,109 | $5M | 0.2% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 158,404 | $5M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 153,301 | $5M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 141,473 | $4M | 0.2% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main added | 138,719 | $4M | 0.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 118,640 | $4M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 112,205 | $4M | 0.2% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 89,753 | $3M | 0.1% | 2026-Q2 |
| UBS Group AG trimmed | 80,976 | $3M | 0.1% | 2026-Q2 |
| Numerai GP LLC added | 78,835 | $3M | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 78,701 | $3M | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 73,202 | $2M | 0.1% | 2026-Q2 |
| COMGEST GLOBAL INVESTORS S.A.S. added | 69,638 | $2M | 0.1% | 2026-Q2 |
| Taikang Asset Management (Hong Kong) Co Ltd new | 68,000 | $2M | 0.1% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 64,788 | $2M | 0.1% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 64,592 | $2M | 0.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 62,136 | $2M | 0.1% | 2026-Q2 |
| LBP AM SA added | 59,000 | $2M | 0.1% | 2026-Q2 |
| Channing Global Advisors, LLC new | 56,980 | $2M | 0.1% | 2026-Q2 |
| Walleye Capital LLC trimmed | 55,638 | $2M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 51,280 | $2M | 0.1% | 2026-Q2 |
| DODGE & COX added | 45,652 | $1M | 0.1% | 2026-Q2 |
| Mariner, LLC trimmed | 45,552 | $1M | 0.1% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 39,612 | $1M | 0.1% | 2026-Q2 |
| Nuveen, LLC added | 34,200 | $1M | 0.0% | 2026-Q2 |
| B. Metzler seel. Sohn & Co. AG new | 32,141 | $1M | 0.0% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 31,977 | $1M | 0.0% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 31,253 | $994K | 0.0% | 2026-Q2 |
| Candriam S.C.A. | 29,100 | $924K | 0.0% | 2026-Q2 |
| Point Nemo Capital, LLC added | 26,863 | $854K | 0.0% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT CO LTD | 25,497 | $811K | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 24,911 | $792K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 24,694 | $785K | 0.0% | 2026-Q2 |
| COMMONWEALTH EQUITY SERVICES, LLC trimmed | 24,560 | $781K | 0.0% | 2026-Q2 |
| Engineers Gate Manager LP added | 23,302 | $741K | 0.0% | 2026-Q2 |
| Headlands Technologies LLC added | 21,345 | $679K | 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.