Who owns Atea Pharmaceuticals, Inc. (AVIR)
Which tracked institutional funds hold AVIR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AVIR company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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 AVIR is one-sided between 2025-Q4 and 2026-Q1: 39 added or opened and 4 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
AVIR’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AVIR 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 2025-Q4 and 2026-Q1, across 127 tracked filers holding AVIR, 66 increased or opened the position and 49 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 AVIR between the 2025-Q4 and 2026-Q1 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 8
- VANGUARD CAPITAL MANAGEMENT LLC$17M
- Rosalind Advisors, Inc.$6M
- VANGUARD PORTFOLIO MANAGEMENT LLC$3M
- VANGUARD FIDUCIARY TRUST CO$3M
- Irenic Capital Management LP$2M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$1M
Full exits 2
- VANGUARD GROUP INC$15M
- TWO SIGMA ADVISERS, LP$4M
Largest adds
- FMR LLC$30M
- BlackRock, Inc.$15M
- BML Capital Management, LLC$11M
- TANG CAPITAL MANAGEMENT LLC$9M
- TWO SIGMA INVESTMENTS, LP$7M
- ACADIAN ASSET MANAGEMENT LLC$4M
Largest trims
- MILLENNIUM MANAGEMENT LLC$610K
- WELLINGTON MANAGEMENT GROUP LLP$560K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| FMR LLC added | 11,950,304 | $64M | 18.6% | 2026-Q1 |
| BlackRock, Inc. trimmed | 8,435,437 | $45M | 13.1% | 2026-Q1 |
| BML Capital Management, LLC trimmed | 7,058,657 | $38M | 11.0% | 2026-Q1 |
| TANG CAPITAL MANAGEMENT LLC | 4,814,700 | $26M | 7.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 3,246,124 | $17M | 5.0% | 2026-Q1 |
| Bain Capital Life Sciences Investors, LLC trimmed | 2,360,638 | $13M | 3.7% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,864,164 | $10M | 2.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,747,706 | $9M | 2.7% | 2026-Q1 |
| STATE STREET CORP trimmed | 1,694,635 | $9M | 2.6% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 1,582,817 | $9M | 2.5% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,255,484 | $7M | 2.0% | 2026-Q1 |
| Rosalind Advisors, Inc. new | 1,171,855 | $6M | 1.8% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,166,400 | $6M | 1.8% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 940,157 | $5M | 1.4% | 2026-Q1 |
| MORGAN STANLEY added | 731,020 | $4M | 1.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 596,709 | $3M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 588,463 | $3M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP added | 585,025 | $3M | 0.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 557,579 | $3M | 0.9% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 484,705 | $3M | 0.8% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 418,296 | $2M | 0.7% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 379,314 | $2M | 0.6% | 2026-Q1 |
| CM Management, LLC | 355,000 | $2M | 0.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 349,932 | $2M | 0.5% | 2026-Q1 |
| BANQUE PICTET & CIE SA | 345,077 | $2M | 0.5% | 2026-Q1 |
| Opaleye Management Inc. added | 322,600 | $2M | 0.5% | 2026-Q1 |
| Irenic Capital Management LP new | 301,699 | $2M | 0.5% | 2026-Q1 |
| Peapod Lane Capital LLC trimmed | 272,820 | $1M | 0.4% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 258,989 | $1M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 243,103 | $1M | 0.4% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 210,542 | $1M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 185,805 | $1,000K | 0.3% | 2026-Q1 |
| Auour Investments LLC | 177,000 | $952K | 0.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 167,230 | $900K | 0.3% | 2026-Q1 |
| BARCLAYS PLC trimmed | 160,946 | $866K | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 156,391 | $841K | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 156,384 | $841K | 0.2% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 148,400 | $798K | 0.2% | 2026-Q1 |
| Invesco Ltd. added | 133,348 | $717K | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 119,553 | $643K | 0.2% | 2026-Q1 |
| Informed Momentum Co LLC new | 112,866 | $607K | 0.2% | 2026-Q1 |
| UBS Group AG trimmed | 109,950 | $592K | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 106,562 | $574K | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 105,640 | $568K | 0.2% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 99,803 | $537K | 0.2% | 2026-Q1 |
| STRS OHIO trimmed | 96,400 | $519K | 0.1% | 2026-Q1 |
| Jump Financial, LLC added | 93,247 | $502K | 0.1% | 2026-Q1 |
| Aldebaran Capital, LLC trimmed | 89,946 | $484K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 89,054 | $479K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 81,835 | $440K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 121,320 | $433K | 0.1% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 70,000 | $377K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 65,686 | $353K | 0.1% | 2026-Q1 |
| ALPS ADVISORS INC added | 64,862 | $349K | 0.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 57,009 | $307K | 0.1% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC trimmed | 55,487 | $299K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC added | 55,098 | $296K | 0.1% | 2026-Q1 |
| Creative Planning added | 51,795 | $279K | 0.1% | 2026-Q1 |
| Empowered Funds, LLC new | 49,469 | $266K | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 48,401 | $260K | 0.1% | 2026-Q1 |
| Rangeley Capital, LLC trimmed | 46,500 | $250K | 0.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 46,109 | $248K | 0.1% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 43,104 | $232K | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC added | 39,778 | $214K | 0.1% | 2026-Q1 |
| Virtu Financial LLC added | 34,030 | $183K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 33,751 | $182K | 0.1% | 2026-Q1 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P trimmed | 32,500 | $175K | 0.1% | 2026-Q1 |
| RBF Capital, LLC | 30,000 | $161K | 0.0% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 28,010 | $148K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 26,769 | $144K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 25,681 | $138K | 0.0% | 2026-Q1 |
| Certified Advisory Corp | 24,500 | $132K | 0.0% | 2026-Q1 |
| XTX Topco Ltd added | 23,141 | $124K | 0.0% | 2026-Q1 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | 22,010 | $118K | 0.0% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 20,172 | $109K | 0.0% | 2026-Q1 |
| JOHNSON INVESTMENT COUNSEL INC | 18,340 | $99K | 0.0% | 2026-Q1 |
| AXQ CAPITAL, LP new | 18,181 | $98K | 0.0% | 2026-Q1 |
| Police & Firemen's Retirement System of New Jersey | 16,938 | $91K | 0.0% | 2026-Q1 |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 16,840 | $91K | 0.0% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 16,346 | $88K | 0.0% | 2026-Q1 |
| Quantinno Capital Management LP new | 15,950 | $86K | 0.0% | 2026-Q1 |
| RFG Advisory, LLC | 14,875 | $80K | 0.0% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 14,257 | $77K | 0.0% | 2026-Q1 |
| China Universal Asset Management Co., Ltd. added | 13,864 | $75K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 4,227,110 | $15M | 4.4% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 1,059,700 | $4M | 1.1% | 2025-Q4 stale |
| Almitas Capital LLC trimmed | 445,386 | $2M | 0.5% | 2025-Q2 stale |
| Newtyn Management, LLC trimmed | 492,284 | $1M | 0.4% | 2025-Q3 stale |
| MARSHALL WACE, LLP added | 113,585 | $405K | 0.1% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 87,774 | $255K | 0.1% | 2025-Q3 stale |
| LOS ANGELES CAPITAL MANAGEMENT LLC | 77,304 | $253K | 0.1% | 2025-Q4 stale |
| HighTower Advisors, LLC added | 75,088 | $225K | 0.1% | 2025-Q1 stale |
| Walleye Capital LLC trimmed | 57,759 | $208K | 0.1% | 2025-Q2 stale |
| MACQUARIE GROUP LTD | 70,000 | $203K | 0.1% | 2025-Q3 stale |
| HRT FINANCIAL LP added | 47,891 | $170K | 0.0% | 2025-Q4 stale |
| Schonfeld Strategic Advisors LLC trimmed | 45,921 | $164K | 0.0% | 2025-Q4 stale |
| NORGES BANK | 36,200 | $146K | 0.0% | 2025-Q1 stale |
| Corebridge Financial, Inc. trimmed | 37,802 | $113K | 0.0% | 2025-Q1 stale |
| Brevan Howard Capital Management LP trimmed | 29,450 | $85K | 0.0% | 2025-Q3 stale |
| ALGERT GLOBAL LLC trimmed | 28,199 | $82K | 0.0% | 2025-Q3 stale |
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.