Who owns ARDX
Which tracked institutional funds hold ARDX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ARDX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 ARDX while 32 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
ARDX’s largest tracked holder by dollar value, BlackRock, Inc., 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 gap the other way — the median holder sizes ARDX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ARDX 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 236 tracked filers holding ARDX, 151 increased or opened the position and 98 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 ARDX 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 14
- VANGUARD CAPITAL MANAGEMENT LLC$62M
- VANGUARD PORTFOLIO MANAGEMENT LLC$40M
- Rubric Capital Management LP$11M
- VANGUARD FIDUCIARY TRUST CO$10M
- Redmile Group, LLC$4M
- SECTOR GAMMA AS$3M
Full exits 12
- VANGUARD GROUP INC$99M
- ORACLE INVESTMENT MANAGEMENT INC$11M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$8M
- TWO SIGMA ADVISERS, LP$8M
- AIGH Capital Management LLC$7M
- PANAGORA ASSET MANAGEMENT INC$4M
Largest adds
- MILLENNIUM MANAGEMENT LLC$37M
- CITADEL ADVISORS LLC$13M
- Point72 Asset Management, L.P.$12M
- STATE STREET CORP$12M
- TWO SIGMA INVESTMENTS, LP$9M
- J. Goldman & Co LP$9M
Largest trims
- JANUS HENDERSON GROUP PLC$34M
- MARSHALL WACE, LLP$21M
- D. E. Shaw & Co., Inc.$6M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$5M
- JANE STREET GROUP, LLC$5M
- BARCLAYS PLC$4M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 21,164,132 | $127M | 10.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 17,842,370 | $107M | 8.9% | 2026-Q1 |
| STATE STREET CORP added | 13,604,307 | $81M | 6.8% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 10,365,512 | $62M | 5.1% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC trimmed | 8,371,234 | $50M | 4.2% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 8,169,369 | $49M | 4.1% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 6,661,693 | $40M | 3.3% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 6,007,455 | $36M | 3.0% | 2026-Q1 |
| Nuveen, LLC added | 5,234,683 | $31M | 2.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 4,274,043 | $26M | 2.1% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 3,464,774 | $21M | 1.7% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 3,216,210 | $19M | 1.6% | 2026-Q1 |
| J. Goldman & Co LP added | 3,000,513 | $18M | 1.5% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 2,984,261 | $18M | 1.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 2,435,548 | $15M | 1.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 2,417,571 | $14M | 1.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 2,336,994 | $14M | 1.2% | 2026-Q1 |
| Rock Springs Capital Management LP | 2,299,473 | $14M | 1.1% | 2026-Q1 |
| Eversept Partners, LP added | 2,229,446 | $13M | 1.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 2,114,098 | $13M | 1.0% | 2026-Q1 |
| NORTHERN TRUST CORP added | 2,071,047 | $12M | 1.0% | 2026-Q1 |
| Freestone Grove Partners LP added | 1,879,783 | $11M | 0.9% | 2026-Q1 |
| Rubric Capital Management LP added | 1,860,896 | $11M | 0.9% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,708,973 | $10M | 0.8% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP added | 1,858,891 | $10M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,678,111 | $10M | 0.8% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 1,565,164 | $9M | 0.8% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 1,498,798 | $9M | 0.7% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,272,441 | $8M | 0.6% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 1,179,379 | $7M | 0.6% | 2026-Q1 |
| Hennion & Walsh Asset Management, Inc. added | 1,001,481 | $6M | 0.5% | 2026-Q1 |
| Trexquant Investment LP added | 804,734 | $5M | 0.4% | 2026-Q1 |
| Redmile Group, LLC trimmed | 733,350 | $4M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 708,589 | $4M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 701,968 | $4M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 700,783 | $4M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 698,744 | $4M | 0.3% | 2026-Q1 |
| Squarepoint Ops LLC added | 697,284 | $4M | 0.3% | 2026-Q1 |
| UBS Group AG added | 688,649 | $4M | 0.3% | 2026-Q1 |
| SECTOR GAMMA AS new | 516,131 | $3M | 0.3% | 2026-Q1 |
| Krensavage Asset Management, LLC new | 500,000 | $3M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 486,712 | $3M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 480,800 | $3M | 0.2% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 473,061 | $3M | 0.2% | 2026-Q1 |
| Ishara Investments LP new | 451,000 | $3M | 0.2% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 450,738 | $3M | 0.2% | 2026-Q1 |
| MONIMUS CAPITAL MANAGEMENT, LP added | 443,775 | $3M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 440,674 | $3M | 0.2% | 2026-Q1 |
| Rafferty Asset Management, LLC added | 407,854 | $2M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 430,136 | $2M | 0.2% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 419,768 | $2M | 0.2% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 357,180 | $2M | 0.2% | 2026-Q1 |
| Clay Northam Wealth Management, LLC added | 331,965 | $2M | 0.2% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 325,124 | $2M | 0.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 313,961 | $2M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 312,712 | $2M | 0.2% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 303,137 | $2M | 0.2% | 2026-Q1 |
| IEQ CAPITAL, LLC added | 295,495 | $2M | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 293,707 | $2M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 291,840 | $2M | 0.1% | 2026-Q1 |
| Raiffeisen Bank International AG added | 300,000 | $2M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 264,770 | $2M | 0.1% | 2026-Q1 |
| Pekin Hardy Strauss, Inc. trimmed | 255,800 | $2M | 0.1% | 2026-Q1 |
| Headlands Technologies LLC added | 222,532 | $1M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 211,320 | $1M | 0.1% | 2026-Q1 |
| Knott David M Jr trimmed | 207,000 | $1M | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 206,662 | $1M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 200,221 | $1M | 0.1% | 2026-Q1 |
| Thrivent Financial for Lutherans added | 196,317 | $1M | 0.1% | 2026-Q1 |
| Carrera Capital Advisors new | 191,144 | $1M | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 185,250 | $1M | 0.1% | 2026-Q1 |
| PROFUND ADVISORS LLC added | 182,061 | $1M | 0.1% | 2026-Q1 |
| SIMPLEX TRADING, LLC added | 174,861 | $1M | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 166,521 | $997K | 0.1% | 2026-Q1 |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 165,498 | $991K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 159,748 | $957K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 143,039 | $857K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 141,281 | $834K | 0.1% | 2026-Q1 |
| PFG Investments, LLC | 137,860 | $826K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 17,020,837 | $99M | 8.2% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 10,455,588 | $58M | 4.8% | 2025-Q3 stale |
| ORACLE INVESTMENT MANAGEMENT INC added | 1,872,624 | $11M | 0.9% | 2025-Q4 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,424,878 | $8M | 0.7% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 1,348,700 | $8M | 0.7% | 2025-Q4 stale |
| AIGH Capital Management LLC added | 1,150,000 | $7M | 0.6% | 2025-Q4 stale |
| Two Seas Capital LP trimmed | 1,539,416 | $6M | 0.5% | 2025-Q2 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 1,211,000 | $6M | 0.5% | 2025-Q1 stale |
| Aberdeen Group plc trimmed | 865,596 | $5M | 0.4% | 2025-Q3 stale |
| OBERWEIS ASSET MANAGEMENT INC/ added | 851,900 | $4M | 0.3% | 2025-Q1 stale |
| PANAGORA ASSET MANAGEMENT INC trimmed | 659,160 | $4M | 0.3% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 569,831 | $3M | 0.3% | 2025-Q3 stale |
| DIADEMA PARTNERS LP trimmed | 252,198 | $1M | 0.1% | 2025-Q4 stale |
| Walleye Capital LLC trimmed | 221,308 | $1M | 0.1% | 2025-Q4 stale |
| Parkman Healthcare Partners LLC added | 301,086 | $1M | 0.1% | 2025-Q2 stale |
| Jump Financial, LLC added | 199,470 | $1M | 0.1% | 2025-Q4 stale |
| MACKENZIE FINANCIAL CORP added | 199,550 | $1M | 0.1% | 2025-Q4 stale |
| Stonepine Capital Management, LLC trimmed | 200,000 | $1M | 0.1% | 2025-Q3 stale |
| DARK FOREST CAPITAL MANAGEMENT LP added | 280,336 | $1M | 0.1% | 2025-Q2 stale |
| NOMURA HOLDINGS INC new | 165,992 | $915K | 0.1% | 2025-Q3 stale |
| HARBOR CAPITAL ADVISORS, INC. added | 153,825 | $897K | 0.1% | 2025-Q4 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.