ARDX · Ardelyx, Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Holder Concentration
Across 252 13F filersWho Holds ARDX
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 250 filers, like-for-like change +4.7%; actively managed books +5.3%; index-like books +3.8%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 48.7% | 122 | +7.6% |
| Exempt adviser | 1.4% | 5 | -44.3% |
| Adviser | 6.3% | 6 | +28.1% |
| Bank | 11.3% | 15 | -0.5% |
| Insurer | 0.1% | 3 | +12.2% |
| Broker-dealer | 0.2% | 2 | -4.6% |
| Benefit plan | 0.3% | 5 | -2.5% |
| Non-US | 1.0% | 7 | +11.9% |
| Holding company | 16.8% | 7 | +13.0% |
| Unknown | 13.9% | 78 | -7.8% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 40.6% | 34 | +3.8% |
| Systematic-like | 14.5% | 25 | -33.2% |
| Concentrated | 4.3% | 26 | +83.1% |
| Diversified active | 40.6% | 165 | +25.4% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 44.3% | 131 | +6.2% |
| Medium turnover | 16.7% | 54 | +98.8% |
| High turnover | 18.9% | 45 | -24.2% |
| Unknown | 20.1% | 20 | -1.8% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 23.4% | 39 | +3.1% |
| Medium horizon | 17.8% | 39 | +4.8% |
| Long horizon | 43.2% | 159 | -3.7% |
| Unknown | 15.6% | 13 | +42.2% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 2.5% | 49 | +14.1% |
| $1B to $10B | 7.6% | 59 | +9.1% |
| $10B to $100B | 20.6% | 78 | +38.6% |
| $100B or more | 69.3% | 64 | -3.1% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.6% | 51 | +37.8% |
| Pooled investment vehicles | 26.9% | 32 | +4.9% |
| Registered funds and BDCs | 16.9% | 17 | +7.9% |
| Pension and profit sharing plans | 0.0% | 2 | -0.6% |
| Insurance companies | 0.1% | 3 | -15.3% |
| Governments and sovereign funds | 1.1% | 4 | +72.8% |
| Other investment advisers | 0.0% | 4 | +7.6% |
| Other | 0.1% | 1 | +7.3% |
| Diversified | 1.9% | 8 | +2.7% |
| Unknown | 51.3% | 128 | +2.1% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 31.0% | 42 | +0.7% |
| Private equity funds | 0.4% | 12 | +3.6% |
| Venture capital funds | 0.0% | 1 | +19.6% |
| Real estate funds | 0.0% | 3 | +564.7% |
| Securitized asset funds | 0.3% | 1 | +10.4% |
| Other private funds | 0.8% | 9 | +63.5% |
| Mixed private funds | 0.2% | 2 | +28.0% |
| Private funds, type not stated | 0.0% | 2 | +15.6% |
| No private funds | 17.4% | 55 | +10.5% |
| Unknown | 49.9% | 123 | +4.6% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 94.8% | 203 | +5.8% |
| Outside the US | 5.1% | 46 | -12.8% |
| Unknown | 0.1% | 1 | 0.0% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 3 holders with no observed 2026-03-31 13F and 1 holder with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
250 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $1,727,570 (1 buying, 1 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 47.9% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ARDX's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | SPRB Spruce Biosciences, Inc. | 5 |
| 2 | SNDX Syndax Pharmaceuticals Inc | 8 |
| 3 | KURA Kura Oncology, Inc. | 6 |
| 4 | PTHS Pelthos Therapeutics Inc. | 3 |
| 5 | TLPH Talphera, Inc. | 3 |
| 6 | COGT Cogent Biosciences, Inc. | 8 |
| 7 | PRTA Prothena Corp Public Ltd Co | 4 |
| 8 | VERA Vera Therapeutics, Inc. | 6 |
| 9 | ARQT Arcutis Biotherapeutics, Inc. | 5 |
| 10 | MGTX MeiraGTx Holdings plc | 4 |
Shareholder Targets
13F filers that own its peers but not ARDX, quarter ended Jun 30, 2026Found through its holder-overlap peers: SPRB, SNDX, KURA, PTHS, TLPH, COGT, PRTA, VERA, ARQT, MGTX, ZYME, SPRY, NAMS, RCUS, RARE, TARS, VKTX, PTCT, MLYS, TVTX. 792 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | RTW INVESTMENTS, LP Registered adviser, Diversified active | $1,192,865,800 4 held | PTCT, RARE, TARS |
| 2 | GILEAD SCIENCES, INC. Unknown, Concentrated | $968,825,350 1 held | RCUS |
| 3 | Frazier Life Sciences Management, L.P. Registered adviser, Concentrated | $928,495,535 3 held | NAMS, ARQT, TARS |
| 4 | DEERFIELD MANAGEMENT COMPANY, L.P. Registered adviser, Diversified active | $757,826,493 6 held | COGT, VERA, NAMS |
| 5 | RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated | $625,326,118 3 held | NAMS, MLYS, SPRY |
| 6 | EcoR1 Capital, LLC Registered adviser, Concentrated | $600,445,942 1 held | ZYME |
| 7 | SUVRETTA CAPITAL MANAGEMENT, LLC Registered adviser, Diversified active | $572,119,084 4 held | ARQT, RCUS, KURA |
| 8 | Kynam Capital Management, LP Registered adviser, Concentrated | $555,543,047 4 held | SNDX, COGT, VERA |
| 9 | Deep Track Capital, LP Adviser, Diversified active | $501,531,235 4 held | TARS, VERA, COGT |
| 10 | Capital World Investors Adviser, Diversified active | $490,456,009 3 held | NAMS, MLYS, SPRY |
Fund Ownership of ARDX by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 16.49% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 3.36% | 8,376,460 |
| Index ETFs | 13.13% | 32,718,354 |
| Active ETFs | 0.07% | 180,104 |
| Active funds | 8.36% | 20,839,405 |
| Unclassified | 0.09% | 216,917 |
| All registered funds | 25.01% | 62,331,240 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $119,873,606 | 13.14% | 23,504,630 | Shares | 2026-08-07 | |
| Large Rubric Capital Management LP Registered adviser | $82,633,770 | 9.05% | 16,202,700 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $70,893,942 | 7.77% | 13,900,773 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $68,116,252 | 7.46% | 13,356,128 | Shares | 2026-09-22 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $53,404,619 | 5.85% | 10,471,494 | Shares | 2026-08-13 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $48,688,333 | 5.34% | 9,546,732 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $40,936,547 | 4.49% | 8,026,774 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $32,648,853 | 3.58% | 6,401,736 | Shares | 2026-08-12 | |
| Mega Jupiter Topco LLC | $27,041,785 | 2.96% | 5,302,311 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $26,570,097 | 2.91% | 5,209,823 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $20,385,204 | 2.23% | 3,997,099 | Shares | 2026-08-11 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $18,793,673 | 2.06% | 3,685,034 | Shares | 2026-08-14 | |
| Mid AIGH Capital Management LLC | $16,319,999 | 1.79% | 3,200,000 | Shares | 2026-08-07 | |
| Mega MORGAN STANLEY Holding company | $12,186,682 | 1.34% | 2,389,546 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $11,812,719 | 1.29% | 2,316,220 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $11,628,727 | 1.27% | 2,280,143 | Shares | 2026-08-13 | |
| Mid Rock Springs Capital Management LP Registered adviser | $11,433,021 | 1.25% | 2,241,769 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $11,279,976 | 1.24% | 2,211,760 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $11,033,848 | 1.21% | 2,163,500 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $10,662,442 | 1.17% | 2,090,675 | Shares | 2026-08-14 | |
| Mega JONES FINANCIAL COMPANIES LLLP | $9,006,253 | 0.99% | 1,765,932 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $8,949,576 | 0.98% | 1,754,819 | Shares | 2026-08-13 | |
| Mid Eversept Partners, LP Registered adviser | $8,559,559 | 0.94% | 1,678,345 | Shares | 2026-08-14 | |
| Mid J. Goldman & Co LP Registered adviser | $8,057,122 | 0.88% | 1,579,828 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $6,981,226 | 0.77% | 1,368,868 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $6,638,282 | 0.73% | 1,301,624 | Shares | 2026-08-11 | |
| Mega SCHRODER INVESTMENT MANAGEMENT GROUP Registered adviser | $5,922,313 | 0.65% | 1,161,238 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $5,253,887 | 0.58% | 1,030,174 | Shares | 2026-09-02 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $4,671,788 | 0.51% | 916,037 | Shares | 2026-08-14 | |
| Mid Hennion & Walsh Asset Management, Inc. | $4,578,863 | 0.50% | 1,338,849 | Shares | 2026-10-13 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $4,552,224 | 0.50% | 892,593 | Shares | 2026-08-13 | |
| Large PANAGORA ASSET MANAGEMENT INC Registered adviser | $4,543,814 | 0.50% | 890,944 | Shares | 2026-08-06 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $4,132,642 | 0.45% | 810,322 | Shares | 2026-08-13 | |
| Mega DEUTSCHE BANK AG\ Non-US | $3,931,639 | 0.43% | 770,910 | Shares | 2026-08-07 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $3,839,907 | 0.42% | 752,923 | Shares | 2026-08-14 | |
| Mega Bank of New York Mellon Corp Bank | $3,823,346 | 0.42% | 749,676 | Shares | 2026-08-06 | |
| Large Squarepoint Ops LLC Registered adviser | $3,647,836 | 0.40% | 715,262 | Shares | 2026-08-14 | |
| Small SECTOR GAMMA AS | $3,502,904 | 0.38% | 686,844 | Shares | 2026-08-12 | |
| Large Trexquant Investment LP Registered adviser | $3,368,988 | 0.37% | 660,586 | Shares | 2026-08-14 | |
| Mid Redmile Group, LLC Registered adviser | $3,272,925 | 0.36% | 641,750 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $2,869,626 | 0.31% | 562,672 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $2,813,776 | 0.31% | 551,721 | Shares | 2026-08-13 | |
| Mid Jump Financial, LLC | $2,738,601 | 0.30% | 536,981 | Shares | 2026-08-13 | |
| Small Krensavage Asset Management, LLC Registered adviser | $2,726,067 | 0.30% | 534,523 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $2,480,698 | 0.27% | 486,412 | Shares | 2026-08-13 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $2,417,879 | 0.26% | 474,094 | Shares | 2026-08-13 | |
| Mega Swiss National Bank | $2,384,760 | 0.26% | 467,600 | Shares | 2026-08-11 | |
| Small HUSSMAN STRATEGIC ADVISORS, INC. Registered adviser | $2,142,000 | 0.23% | 420,000 | Shares | 2026-08-03 | |
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $2,098,068 | 0.23% | 411,386 | Shares | 2026-08-06 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $2,033,880 | 0.22% | 398,800 | Put | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $1,834,138 | 0.20% | 359,635 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $1,586,206 | 0.17% | 311,021 | Shares | 2026-08-03 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $1,559,580 | 0.17% | 305,800 | Shares | 2026-08-12 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1,558,560 | 0.17% | 305,600 | Call | 2026-08-14 | |
| Small DIADEMA PARTNERS LP Registered adviser | $1,545,427 | 0.17% | 303,025 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $1,545,300 | 0.17% | 303,000 | Put | 2026-09-02 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $1,530,000 | 0.17% | 300,000 | Call | 2026-08-14 | |
| Mid Raiffeisen Bank International AG | $1,530,000 | 0.17% | 300,000 | Shares | 2026-08-03 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $1,507,738 | 0.17% | 295,635 | Shares | 2026-08-24 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $1,430,395 | 0.16% | 280,470 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $1,350,327 | 0.15% | 264,770 | Shares | 2026-08-14 | |
| Small Knott David M Jr | $1,342,156 | 0.15% | 263,168 | Shares | 2026-08-12 | |
| Large Freestone Grove Partners LP Registered adviser | $1,293,829 | 0.14% | 253,692 | Shares | 2026-08-14 | |
| Large IEQ CAPITAL, LLC Registered adviser | $1,228,069 | 0.13% | 240,798 | Shares | 2026-08-11 | |
| Small Headlands Technologies LLC | $1,228,059 | 0.13% | 240,796 | Shares | 2026-08-13 | |
| Mid Pekin Hardy Strauss, Inc. Registered adviser | $1,154,640 | 0.13% | 226,400 | Shares | 2026-07-30 | |
| Mega JPMORGAN CHASE & CO Bank | $1,151,576 | 0.13% | 225,800 | Shares | 2026-08-12 | |
| Small Clay Northam Wealth Management, LLC Registered adviser | $1,074,615 | 0.12% | 314,215 | Shares | 2026-10-13 | |
| Mega LPL Financial LLC Broker-dealer | $1,074,121 | 0.12% | 210,612 | Shares | 2026-08-07 | |
| Large Thrivent Financial for Lutherans Registered adviser | $1,073,830 | 0.12% | 210,555 | Shares | 2026-08-14 | |
| Large Rafferty Asset Management, LLC Registered adviser | $1,051,431 | 0.12% | 206,163 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $1,049,070 | 0.11% | 205,700 | Put | 2026-08-14 | |
| Small Virtus Investment Advisers, LLC Registered adviser | $1,042,302 | 0.11% | 204,373 | Shares | 2026-08-11 | |
| Mega FRANKLIN RESOURCES INC Adviser | $1,027,369 | 0.11% | 201,445 | Shares | 2026-08-13 | |
| Large Caption Management, LLC Registered adviser | $1,020,000 | 0.11% | 200,000 | Put | 2026-08-14 | |
| Small MONIMUS CAPITAL MANAGEMENT, LP Registered adviser | $997,616 | 0.11% | 195,611 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $996,865 | 0.11% | 195,464 | Shares | 2026-08-14 | |
| Small Carrera Capital Advisors | $995,310 | 0.11% | 195,159 | Shares | 2026-08-03 | |
| Mega JANE STREET GROUP, LLC | $875,160 | 0.10% | 171,600 | Call | 2026-08-14 | |
| Large Walleye Capital LLC Registered adviser | $872,171 | 0.10% | 171,014 | Shares | 2026-08-03 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $849,257 | 0.09% | 166,521 | Shares | 2026-08-13 | |
| Mega SEI INVESTMENTS CO | $775,500 | 0.08% | 152,059 | Shares | 2026-08-14 | |
| Mid SIMPLEX TRADING, LLC | $772,277 | 0.08% | 151,427 | Shares | 2026-08-12 | |
| Large Caption Management, LLC Registered adviser | $765,000 | 0.08% | 150,000 | Call | 2026-08-14 | |
| Small Stonepine Capital Management, LLC Registered adviser | $765,000 | 0.08% | 150,000 | Call | 2026-08-17 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $731,467 | 0.08% | 143,425 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC Registered adviser | $727,525 | 0.08% | 142,652 | Shares | 2026-08-14 | |
| Mid PFG Investments, LLC | $702,066 | 0.08% | 137,660 | Shares | 2026-07-23 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $696,210 | 0.08% | 136,512 | Shares | 2026-08-14 | |
| Mid Inspire Investing, LLC Registered adviser | $684,680 | 0.08% | 134,251 | Shares | 2026-08-12 | |
| Large Caption Management, LLC Registered adviser | $663,000 | 0.07% | 130,000 | Shares | 2026-08-14 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC Registered adviser | $659,771 | 0.07% | 129,367 | Shares | 2026-08-13 | |
| Micro Lion Point Capital, LP Registered adviser | $656,115 | 0.07% | 128,650 | Shares | 2026-08-14 | |
| Small SECTORAL ASSET MANAGEMENT INC Registered adviser | $624,209 | 0.07% | 122,394 | Shares | 2026-08-14 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $590,529 | 0.06% | 115,790 | Shares | 2026-08-12 | |
| Small Pavaki Capital Management LLC Registered adviser | $586,500 | 0.06% | 115,000 | Shares | 2026-08-07 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $575,810 | 0.06% | 112,904 | Shares | 2026-08-13 | |
| Mid GROUP ONE TRADING LLC Broker-dealer | $540,105 | 0.06% | 105,903 | Shares | 2026-08-14 | |
| Mid PROFUND ADVISORS LLC Registered adviser | $537,223 | 0.06% | 105,338 | Shares | 2026-08-11 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE | $535,102 | 0.06% | 104,922 | Shares | 2026-09-09 |
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