RARE · Ultragenyx Pharmaceutical 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 317 13F filersWho Holds RARE
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: 311 filers, like-for-like change +8.7%; actively managed books +4.2%; index-like books +23.3%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 57.1% | 157 | +12.7% |
| Exempt adviser | 1.7% | 6 | -21.8% |
| Adviser | 2.4% | 9 | +112.7% |
| Bank | 10.4% | 18 | +26.1% |
| Insurer | 0.0% | 2 | +56.0% |
| Broker-dealer | 0.0% | 1 | -87.4% |
| Benefit plan | 0.2% | 4 | -36.1% |
| Non-US | 3.5% | 12 | -10.3% |
| Holding company | 14.6% | 9 | +26.4% |
| Unknown | 10.1% | 93 | -27.6% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 28.2% | 33 | +23.3% |
| Systematic-like | 9.5% | 29 | -22.7% |
| Concentrated | 3.2% | 41 | -33.2% |
| Diversified active | 59.2% | 208 | +13.9% |
| Unknown | 0.0% | 0 | -100.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 38.1% | 156 | +25.0% |
| Medium turnover | 36.4% | 72 | +19.5% |
| High turnover | 13.2% | 51 | -32.0% |
| Unknown | 12.4% | 32 | +5.1% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 13.8% | 54 | -3.1% |
| Medium horizon | 16.9% | 53 | +44.7% |
| Long horizon | 59.7% | 182 | +12.0% |
| Unknown | 9.5% | 22 | -25.4% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 4.4% | 57 | -42.6% |
| $1B to $10B | 9.2% | 89 | -7.6% |
| $10B to $100B | 29.4% | 101 | +16.4% |
| $100B or more | 57.1% | 64 | +15.9% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 3.0% | 70 | +22.4% |
| Pooled investment vehicles | 21.4% | 45 | -4.9% |
| Registered funds and BDCs | 15.6% | 16 | +20.5% |
| Pension and profit sharing plans | 0.0% | 2 | +65.6% |
| Insurance companies | 0.1% | 3 | +1372.8% |
| Governments and sovereign funds | 1.6% | 4 | +79.8% |
| Other investment advisers | 0.0% | 2 | +17.7% |
| Other | 0.1% | 1 | -27.0% |
| Diversified | 15.3% | 13 | +30.5% |
| Charitable organizations | 0.0% | 0 | -100.0% |
| Corporations | 0.0% | 0 | — |
| Unknown | 42.9% | 155 | +3.8% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 33.7% | 59 | +8.3% |
| Private equity funds | 0.4% | 12 | +62.3% |
| Venture capital funds | 0.3% | 2 | -62.3% |
| Real estate funds | 0.0% | 3 | +207.3% |
| Securitized asset funds | 0.2% | 1 | -25.0% |
| Other private funds | 8.8% | 18 | +16.5% |
| Mixed private funds | 0.1% | 2 | +199.5% |
| Private funds, type not stated | 0.5% | 5 | -14.2% |
| No private funds | 14.7% | 61 | +20.2% |
| Unknown | 41.2% | 148 | +5.2% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 90.0% | 248 | +14.1% |
| Outside the US | 10.0% | 63 | -24.2% |
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
311 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 sellers of $999,622 (0 buying, 2 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 54.1% 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 RARE's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | TARS Tarsus Pharmaceuticals, Inc. | 9 |
| 2 | IMTX Immatics N.V. | 7 |
| 3 | CLDX Celldex Therapeutics, Inc. | 11 |
| 4 | BBIO BridgeBio Pharma, Inc. | 13 |
| 5 | INSM INSMED Inc | 16 |
| 6 | SNDX Syndax Pharmaceuticals Inc | 10 |
| 7 | ACAD Acadia Pharmaceuticals Inc | 8 |
| 8 | HELP Helus Pharma Inc. | 7 |
| 9 | MLYS Mineralys Therapeutics, Inc. | 10 |
| 10 | RCUS Arcus Biosciences, Inc. | 7 |
Shareholder Targets
13F filers that own its peers but not RARE, quarter ended Jun 30, 2026Found through its holder-overlap peers: TARS, IMTX, CLDX, BBIO, INSM, SNDX, ACAD, HELP, MLYS, RCUS, CMPS, VERA, KLRS, VSTM, ANNX, PRQR, WVE, PTGX, BMRN, TENX. 939 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | BAKER BROS. ADVISORS LP Registered adviser, Concentrated | $2,204,237,217 7 held | ACAD, INSM, IMTX |
| 2 | FARALLON CAPITAL MANAGEMENT LLC Registered adviser, Diversified active | $1,578,392,229 2 held | BBIO, PTGX |
| 3 | VIKING GLOBAL INVESTORS LP Registered adviser, Diversified active | $1,176,837,565 2 held | BBIO, BMRN |
| 4 | Kohlberg Kravis Roberts & Co. L.P. Registered adviser, Concentrated | $987,677,120 1 held | BBIO |
| 5 | GILEAD SCIENCES, INC. Unknown, Concentrated | $968,825,350 1 held | RCUS |
| 6 | PRIMECAP MANAGEMENT CO/CA/ Registered adviser, Diversified active | $918,742,814 3 held | BMRN, BBIO, WVE |
| 7 | Deep Track Capital, LP Adviser, Diversified active | $895,061,462 6 held | TARS, BMRN, CMPS |
| 8 | Capital International Investors Adviser, Diversified active | $878,348,780 1 held | INSM |
| 9 | Dodge & Cox Registered adviser, Diversified active | $849,426,894 1 held | BMRN |
| 10 | Darwin Global Management, Ltd. Exempt adviser, Concentrated | $685,690,599 1 held | INSM |
Fund Ownership of RARE by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 20.40% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.73% | 2,686,982 |
| Index ETFs | 17.67% | 17,423,766 |
| Active ETFs | 0.34% | 338,689 |
| Active funds | 11.45% | 11,287,557 |
| Unclassified | 0.12% | 122,268 |
| All registered funds | 32.32% | 31,859,262 |
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 | $355,746,266 | 9.69% | 10,654,276 | Shares | 2026-08-07 | |
| Large RTW INVESTMENTS, LP Registered adviser | $260,338,324 | 7.09% | 7,796,895 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $226,722,607 | 6.18% | 6,790,135 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $219,065,409 | 5.97% | 6,560,809 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $205,641,196 | 5.60% | 6,158,766 | Shares | 2026-09-22 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $143,459,834 | 3.91% | 4,296,491 | Shares | 2026-08-13 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $120,911,868 | 3.29% | 3,621,200 | Shares | 2026-08-14 | |
| Large SANDS CAPITAL MANAGEMENT, LLC Registered adviser | $105,457,907 | 2.87% | 3,158,368 | Shares | 2026-08-13 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC Registered adviser | $98,157,217 | 2.67% | 2,939,719 | Shares | 2026-08-14 | |
| Large FRONTIER CAPITAL MANAGEMENT CO LLC Registered adviser | $95,092,583 | 2.59% | 2,847,936 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $86,107,066 | 2.35% | 2,578,828 | Shares | 2026-08-12 | |
| Mid Bellevue Group AG Non-US | $66,204,857 | 1.80% | 1,982,775 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $57,771,143 | 1.57% | 1,730,193 | Shares | 2026-08-14 | |
| Mid Sofinnova Investments, Inc. | $57,347,491 | 1.56% | 1,717,505 | Shares | 2026-08-14 | |
| Large ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser | $52,756,200 | 1.44% | 1,580,000 | Shares | 2026-08-14 | |
| Large GW&K Investment Management, LLC Registered adviser | $49,456,532 | 1.35% | 1,481,178 | Shares | 2026-08-12 | |
| Mid MPM BIOIMPACT LLC Adviser | $47,354,198 | 1.29% | 1,418,215 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $45,293,568 | 1.23% | 1,356,501 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $44,235,235 | 1.20% | 1,324,805 | Shares | 2026-08-13 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $41,752,990 | 1.14% | 1,250,464 | Shares | 2026-08-14 | |
| Large VOLORIDGE INVESTMENT MANAGEMENT, LLC Registered adviser | $41,455,554 | 1.13% | 1,241,556 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $38,346,877 | 1.04% | 1,148,454 | Shares | 2026-08-14 | |
| Large Candriam S.C.A. Registered adviser | $33,451,470 | 0.91% | 1,001,841 | Shares | 2026-08-13 | |
| Mid Rock Springs Capital Management LP Registered adviser | $32,316,678 | 0.88% | 967,855 | Shares | 2026-08-14 | |
| Large Jefferies Financial Group Inc. Holding company | $31,040,212 | 0.85% | 929,626 | Shares | 2026-08-17 | |
| Mega NORTHERN TRUST CORP Bank | $30,729,282 | 0.84% | 920,314 | Shares | 2026-08-13 | |
| Small Eagle Health Investments LP Registered adviser | $29,520,800 | 0.80% | 884,121 | Shares | 2026-08-10 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $29,457,292 | 0.80% | 882,219 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $26,181,059 | 0.71% | 784,099 | Shares | 2026-08-06 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $25,403,946 | 0.69% | 760,825 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $25,377,702 | 0.69% | 760,039 | Shares | 2026-08-14 | |
| Mega Pictet Asset Management Holding SA | $25,165,876 | 0.69% | 753,695 | Shares | 2026-07-30 | |
| Large Caption Management, LLC Registered adviser | $24,000,732 | 0.65% | 718,800 | Put | 2026-08-14 | |
| Mega Nuveen, LLC | $23,171,290 | 0.63% | 693,959 | Shares | 2026-08-11 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $22,418,413 | 0.61% | 671,411 | Shares | 2026-08-13 | |
| Mega UBS Group AG Bank | $21,960,568 | 0.60% | 657,699 | Shares | 2026-08-13 | |
| Small GREAT POINT PARTNERS LLC Registered adviser | $20,034,000 | 0.55% | 600,000 | Put | 2026-08-14 | |
| Small Palo Alto Investors LP Registered adviser | $19,916,968 | 0.54% | 596,495 | Shares | 2026-08-19 | |
| Small SPHERA FUNDS MANAGEMENT LTD. Exempt adviser | $19,649,814 | 0.54% | 588,494 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $19,583,902 | 0.53% | 586,520 | Shares | 2026-08-14 | |
| Large PANAGORA ASSET MANAGEMENT INC Registered adviser | $19,574,219 | 0.53% | 586,230 | Shares | 2026-08-06 | |
| Mega FMR LLC Holding company | $19,260,986 | 0.52% | 576,849 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $19,210,535 | 0.52% | 575,338 | Shares | 2026-08-14 | |
| Large Trexquant Investment LP Registered adviser | $18,577,695 | 0.51% | 556,385 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16,995,510 | 0.46% | 509,000 | Put | 2026-08-14 | |
| Mid Sofinnova Investments, Inc. | $16,695,000 | 0.45% | 500,000 | Call | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $16,633,796 | 0.45% | 498,167 | Shares | 2026-08-13 | |
| Mega JPMORGAN CHASE & CO Bank | $16,465,475 | 0.45% | 493,126 | Shares | 2026-08-12 | |
| Mega Bank of New York Mellon Corp Bank | $15,716,569 | 0.43% | 470,697 | Shares | 2026-08-06 | |
| Large TORONTO DOMINION BANK Bank | $13,856,850 | 0.38% | 415,000 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $13,813,443 | 0.38% | 413,700 | Shares | 2026-08-13 | |
| Large Caption Management, LLC Registered adviser | $13,753,341 | 0.37% | 411,900 | Call | 2026-08-14 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. Non-US | $13,665,023 | 0.37% | 409,255 | Shares | 2026-08-13 | |
| Small Krensavage Asset Management, LLC Registered adviser | $13,051,449 | 0.36% | 390,879 | Shares | 2026-08-14 | |
| Mid ALGERT GLOBAL LLC Registered adviser | $13,020,897 | 0.35% | 389,964 | Shares | 2026-08-13 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Non-US | $12,735,613 | 0.35% | 381,420 | Shares | 2026-09-09 | |
| Mid SummitTX Capital, L.P. Registered adviser | $12,496,875 | 0.34% | 374,270 | Shares | 2026-08-14 | |
| Small Privium Fund Management B.V. | $11,312,532 | 0.31% | 338,800 | Shares | 2026-08-07 | |
| Large Squarepoint Ops LLC Registered adviser | $11,298,107 | 0.31% | 338,368 | Shares | 2026-08-14 | |
| Large Walleye Capital LLC Registered adviser | $11,180,775 | 0.30% | 334,854 | Shares | 2026-08-03 | |
| Small Catalio Capital Management, LP Registered adviser | $10,559,654 | 0.29% | 316,252 | Shares | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC Adviser | $10,543,426 | 0.29% | 315,766 | Shares | 2026-08-13 | |
| Mega CITIGROUP INC Bank | $9,976,430 | 0.27% | 298,785 | Shares | 2026-08-03 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $9,944,176 | 0.27% | 297,819 | Shares | 2026-08-14 | |
| Large Ensign Peak Advisors, Inc | $9,710,413 | 0.26% | 290,818 | Shares | 2026-08-14 | |
| Small GordonMD Global Investments LP | $9,653,082 | 0.26% | 289,101 | Shares | 2026-08-14 | |
| Large Jump Financial, LLC | $9,581,327 | 0.26% | 286,952 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $9,215,640 | 0.25% | 276,000 | Call | 2026-08-14 | |
| Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser | $9,111,529 | 0.25% | 272,882 | Shares | 2026-08-03 | |
| Mega Invesco Ltd. Adviser | $8,365,294 | 0.23% | 250,533 | Shares | 2026-08-14 | |
| Large Quantinno Capital Management LP Registered adviser | $8,363,059 | 0.23% | 250,466 | Shares | 2026-08-13 | |
| Mid KENNEDY CAPITAL MANAGEMENT LLC Registered adviser | $7,212,139 | 0.20% | 215,997 | Shares | 2026-08-14 | |
| Large Assenagon Asset Management S.A. | $7,182,371 | 0.20% | 477,869 | Shares | 2026-10-15 | |
| Large WORLDQUANT MILLENNIUM ADVISORS LLC | $7,157,947 | 0.19% | 214,374 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO Holding company | $7,073,102 | 0.19% | 211,833 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $7,029,630 | 0.19% | 210,531 | Shares | 2026-09-02 | |
| Small Ishara Investments LP Registered adviser | $6,844,950 | 0.19% | 205,000 | Shares | 2026-08-14 | |
| Small Stonepine Capital Management, LLC Registered adviser | $6,678,000 | 0.18% | 200,000 | Call | 2026-08-17 | |
| Large Man Group plc | $6,514,722 | 0.18% | 195,110 | Shares | 2026-08-14 | |
| Large FIFTH THIRD BANCORP Bank | $6,452,150 | 0.18% | 193,236 | Shares | 2026-08-05 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $6,396,789 | 0.17% | 191,578 | Shares | 2026-08-13 | |
| Small Blue Owl Capital Holdings LP Adviser | $6,098,282 | 0.17% | 182,638 | Shares | 2026-08-11 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6,039,282 | 0.16% | 180,871 | Shares | 2026-08-14 | |
| Mega SCHRODER INVESTMENT MANAGEMENT GROUP Registered adviser | $5,745,950 | 0.16% | 172,086 | Shares | 2026-08-13 | |
| Large Woodline Partners LP Registered adviser | $5,736,568 | 0.16% | 171,805 | Shares | 2026-08-14 | |
| Mid Atom Investors LP Registered adviser | $5,735,433 | 0.16% | 171,771 | Shares | 2026-08-14 | |
| Mega Swiss National Bank | $5,597,900 | 0.15% | 167,652 | Shares | 2026-08-11 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $5,583,673 | 0.15% | 167,226 | Shares | 2026-08-13 | |
| Small Ikarian Capital, LLC Registered adviser | $5,529,951 | 0.15% | 165,617 | Shares | 2026-08-14 | |
| Mega DEUTSCHE BANK AG\ Non-US | $5,503,105 | 0.15% | 164,813 | Shares | 2026-08-07 | |
| Mega MARSHALL WACE, LLP Exempt adviser | $5,338,693 | 0.15% | 159,889 | Shares | 2026-08-13 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $5,263,697 | 0.14% | 157,643 | Shares | 2026-08-14 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $5,235,852 | 0.14% | 156,809 | Shares | 2026-08-14 | |
| Mid BOOTHBAY FUND MANAGEMENT, LLC Registered adviser | $5,229,274 | 0.14% | 156,612 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC Bank | $5,171,307 | 0.14% | 154,876 | Shares | 2026-08-14 | |
| Mid Eversept Partners, LP Registered adviser | $5,146,400 | 0.14% | 154,130 | Shares | 2026-08-14 | |
| Mid Ghisallo Capital Management LLC Registered adviser | $5,008,500 | 0.14% | 150,000 | Shares | 2026-08-14 | |
| Large Corient Private Wealth LLC Registered adviser | $4,891,401 | 0.13% | 146,493 | Shares | 2026-08-27 | |
| Large Mariner, LLC Registered adviser | $4,888,296 | 0.13% | 146,400 | Shares | 2026-08-13 | |
| Large FRED ALGER MANAGEMENT, LLC Registered adviser | $4,779,945 | 0.13% | 143,155 | Shares | 2026-08-14 |
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