Who owns ARTV (ARTV)
Which tracked institutional funds hold ARTV, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ARTV 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 ARTV is one-sided between 2025-Q4 and 2026-Q1: 10 added or opened and 1 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
ARTV’s largest tracked holder by dollar value, RA CAPITAL MANAGEMENT, L.P., sizes it at 0.7% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ARTV 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 40 tracked filers holding ARTV, 15 increased or opened the position and 18 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 ARTV 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 2
- VANGUARD CAPITAL MANAGEMENT LLC$1M
- Propel Bio Management, LLC$950K
Full exits 1
- VANGUARD GROUP INC$1M
Largest adds
- RA CAPITAL MANAGEMENT, L.P.$21M
- 5AM Venture Management, LLC$5M
- Venrock Adviser, LLC$3M
- FRANKLIN RESOURCES INC$1M
- Revelation Capital Management, LLC$644K
- venBio Partners LLC$640K
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 |
|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 9,853,302 | $63M | 54.6% | 2026-Q1 |
| 5AM Venture Management, LLC | 2,353,304 | $15M | 13.0% | 2026-Q1 |
| Venrock Adviser, LLC | 1,609,569 | $10M | 8.9% | 2026-Q1 |
| venBio Partners LLC trimmed | 531,337 | $3M | 2.9% | 2026-Q1 |
| FRANKLIN RESOURCES INC | 520,327 | $3M | 2.9% | 2026-Q1 |
| Revelation Capital Management, LLC | 299,311 | $2M | 1.7% | 2026-Q1 |
| BlackRock, Inc. added | 213,388 | $1M | 1.2% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 207,686 | $1M | 1.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP | 194,108 | $1M | 1.1% | 2026-Q1 |
| Propel Bio Management, LLC new | 146,369 | $950K | 0.8% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 123,270 | $794K | 0.7% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 115,041 | $741K | 0.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 101,695 | $655K | 0.6% | 2026-Q1 |
| Alyeska Investment Group, L.P. | 100,000 | $644K | 0.6% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 80,038 | $515K | 0.4% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 39,496 | $254K | 0.2% | 2026-Q1 |
| STATE STREET CORP | 35,824 | $231K | 0.2% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 35,000 | $225K | 0.2% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 32,810 | $211K | 0.2% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC new | 30,702 | $198K | 0.2% | 2026-Q1 |
| Velan Capital Investment Management LP new | 25,000 | $161K | 0.1% | 2026-Q1 |
| Simplify Asset Management Inc. new | 23,230 | $150K | 0.1% | 2026-Q1 |
| Sanctuary Advisors, LLC new | 21,581 | $139K | 0.1% | 2026-Q1 |
| BAILARD, INC. new | 20,700 | $133K | 0.1% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP new | 20,370 | $131K | 0.1% | 2026-Q1 |
| XTX Topco Ltd trimmed | 20,270 | $131K | 0.1% | 2026-Q1 |
| MORGAN STANLEY trimmed | 16,377 | $105K | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 15,870 | $102K | 0.1% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 12,208 | $79K | 0.1% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 11,465 | $74K | 0.1% | 2026-Q1 |
| OMERS ADMINISTRATION Corp trimmed | 11,400 | $73K | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. | 5,491 | $35K | 0.0% | 2026-Q1 |
| FMR LLC trimmed | 3,529 | $23K | 0.0% | 2026-Q1 |
| UBS Group AG trimmed | 1,527 | $10K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN | 1,500 | $10K | 0.0% | 2026-Q1 |
| MARK SHEPTOFF FINANCIAL PLANNING, LLC | 400 | $4K | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS | 542 | $3K | 0.0% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 223 | $1K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 188 | $1K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 18 | $116 | 0.0% | 2026-Q1 |
| Capital World Investors trimmed | 866,622 | $3M | 2.2% | 2025-Q1 stale |
| VANGUARD GROUP INC added | 246,006 | $1M | 0.9% | 2025-Q4 stale |
| NORGES BANK | 30,000 | $464K | 0.4% | 2025-Q3 stale |
| SAMSARA BIOCAPITAL, LLC | 291,666 | $440K | 0.4% | 2025-Q2 stale |
| Logos Global Management LP | 145,089 | $435K | 0.4% | 2025-Q1 stale |
| Woodline Partners LP | 283,124 | $428K | 0.4% | 2025-Q2 stale |
| MARSHALL WACE, LLP added | 79,559 | $341K | 0.3% | 2025-Q4 stale |
| BARCLAYS PLC added | 19,616 | $303K | 0.3% | 2025-Q3 stale |
| CITIGROUP INC added | 105,573 | $303K | 0.3% | 2025-Q3 stale |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 54,881 | $165K | 0.1% | 2025-Q1 stale |
| Nuveen, LLC new | 47,892 | $144K | 0.1% | 2025-Q1 stale |
| Scientech Research LLC new | 27,757 | $119K | 0.1% | 2025-Q4 stale |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. new | 39,133 | $112K | 0.1% | 2025-Q3 stale |
| Bank of New York Mellon Corp | 33,305 | $100K | 0.1% | 2025-Q1 stale |
| SEI INVESTMENTS CO new | 29,281 | $88K | 0.1% | 2025-Q1 stale |
| HRT FINANCIAL LP trimmed | 26,953 | $77K | 0.1% | 2025-Q3 stale |
| Qube Research & Technologies Ltd trimmed | 25,552 | $73K | 0.1% | 2025-Q3 stale |
| ACUTA CAPITAL PARTNERS, LLC | 45,456 | $69K | 0.1% | 2025-Q2 stale |
| Squarepoint Ops LLC new | 41,395 | $63K | 0.1% | 2025-Q2 stale |
| Y-Intercept (Hong Kong) Ltd new | 31,567 | $48K | 0.0% | 2025-Q2 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 10,691 | $46K | 0.0% | 2025-Q4 stale |
| RHUMBLINE ADVISERS added | 14,493 | $43K | 0.0% | 2025-Q1 stale |
| Ground Swell Capital, LLC new | 24,849 | $38K | 0.0% | 2025-Q2 stale |
| INTECH INVESTMENT MANAGEMENT LLC new | 11,547 | $35K | 0.0% | 2025-Q1 stale |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 11,477 | $34K | 0.0% | 2025-Q1 stale |
| Corebridge Financial, Inc. added | 9,738 | $29K | 0.0% | 2025-Q1 stale |
| Jain Global LLC new | 17,171 | $26K | 0.0% | 2025-Q2 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 16,121 | $24K | 0.0% | 2025-Q2 stale |
| China Universal Asset Management Co., Ltd. trimmed | 4,281 | $12K | 0.0% | 2025-Q3 stale |
| Police & Firemen's Retirement System of New Jersey | 3,477 | $10K | 0.0% | 2025-Q1 stale |
| NEW YORK STATE COMMON RETIREMENT FUND | 2,937 | $9K | 0.0% | 2025-Q1 stale |
| Legal & General Group Plc added | 2,018 | $6K | 0.0% | 2025-Q1 stale |
| DEUTSCHE BANK AG\ trimmed | 3,383 | $5K | 0.0% | 2025-Q2 stale |
| Tower Research Capital LLC (TRC) trimmed | 1,103 | $5K | 0.0% | 2025-Q4 stale |
| Ameritas Investment Partners, Inc. | 1,424 | $4K | 0.0% | 2025-Q1 stale |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 1,041 | $3K | 0.0% | 2025-Q1 stale |
| Mirae Asset Global Investments Co., Ltd. added | 944 | $3K | 0.0% | 2025-Q3 stale |
| GF FUND MANAGEMENT CO. LTD. trimmed | 510 | $1K | 0.0% | 2025-Q3 stale |
| AMALGAMATED BANK | 480 | $1K | 0.0% | 2025-Q1 stale |
| NISA INVESTMENT ADVISORS, LLC added | 329 | $497 | 0.0% | 2025-Q2 stale |
| BANK OF AMERICA CORP /DE/ trimmed | 113 | $484 | 0.0% | 2025-Q4 stale |
| Sterling Capital Management LLC trimmed | 158 | $474 | 0.0% | 2025-Q1 stale |
| EverSource Wealth Advisors, LLC new | 159 | $456 | 0.0% | 2025-Q3 stale |
| CWM, LLC trimmed | 10 | — | 0.0% | 2025-Q2 stale |
| Cloud Capital Management, LLC new | 11 | — | 0.0% | 2025-Q3 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 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.