PHAT · Phathom Pharmaceuticals, 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 163 13F filersWho Holds PHAT
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: 161 filers, like-for-like change +4.6%; actively managed books +0.7%; index-like books +24.9%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 56.0% | 72 | +0.3% |
| Exempt adviser | 13.5% | 6 | -2.2% |
| Adviser | 11.2% | 6 | +16.8% |
| Bank | 4.3% | 13 | +6.5% |
| Insurer | 0.0% | 1 | +0.6% |
| Broker-dealer | 0.0% | 1 | -59.3% |
| Benefit plan | 0.2% | 2 | +35.4% |
| Non-US | 0.1% | 5 | +14.6% |
| Holding company | 9.3% | 8 | +37.9% |
| Unknown | 5.3% | 47 | +1.9% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 19.8% | 26 | +24.9% |
| Systematic-like | 8.6% | 16 | -3.0% |
| Concentrated | 29.4% | 26 | +1.8% |
| Diversified active | 29.7% | 91 | +0.7% |
| Unknown | 12.4% | 2 | 0.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 70.7% | 86 | +8.4% |
| Medium turnover | 10.1% | 37 | -5.8% |
| High turnover | 11.5% | 27 | -10.0% |
| Unknown | 7.7% | 11 | +12.1% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 10.1% | 23 | -4.0% |
| Medium horizon | 16.7% | 27 | +6.5% |
| Long horizon | 66.1% | 102 | +5.9% |
| Unknown | 7.1% | 9 | +1.9% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 15.2% | 23 | -0.3% |
| $1B to $10B | 28.1% | 38 | -3.6% |
| $10B to $100B | 17.0% | 46 | +8.5% |
| $100B or more | 39.7% | 54 | +11.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 3.9% | 21 | +35.4% |
| Pooled investment vehicles | 41.4% | 27 | -2.4% |
| Registered funds and BDCs | 7.8% | 9 | +3.2% |
| Pension and profit sharing plans | 0.0% | 1 | -15.2% |
| Insurance companies | 0.1% | 3 | +3.5% |
| Governments and sovereign funds | 0.3% | 2 | -39.7% |
| Other investment advisers | 0.0% | 1 | -8.7% |
| Diversified | 2.3% | 7 | +1.7% |
| Unknown | 44.1% | 90 | +10.9% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 19.2% | 31 | -1.2% |
| Private equity funds | 5.5% | 5 | -0.4% |
| Venture capital funds | 16.6% | 4 | -0.3% |
| Securitized asset funds | 0.1% | 1 | 0.0% |
| Other private funds | 2.0% | 6 | -3.7% |
| Mixed private funds | 17.4% | 3 | -0.2% |
| Private funds, type not stated | 0.3% | 1 | -10.1% |
| No private funds | 8.3% | 26 | +3.8% |
| Real estate funds | 0.0% | 1 | +20.0% |
| Unknown | 30.5% | 83 | +17.6% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 84.0% | 126 | +4.7% |
| Outside the US | 16.0% | 35 | +4.3% |
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 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
161 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 $859,179 (1 buying, 0 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 43.1% 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 PHAT's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | IMUX Immunic, Inc. | 5 |
| 2 | CRBP Corbus Pharmaceuticals Holdings, Inc. | 5 |
| 3 | LONA LeonaBio, Inc. | 4 |
| 4 | CNTB Connect Biopharma Holdings Ltd | 4 |
| 5 | RLMD Relmada Therapeutics, Inc. | 6 |
| 6 | UPB Upstream Bio, Inc. | 4 |
| 7 | FDMT 4D Molecular Therapeutics, Inc. | 5 |
| 8 | SPRB Spruce Biosciences, Inc. | 4 |
| 9 | ACHV Achieve Life Sciences, Inc. | 4 |
| 10 | VYGR Voyager Therapeutics, Inc. | 3 |
Shareholder Targets
13F filers that own its peers but not PHAT, quarter ended Jun 30, 2026Found through its holder-overlap peers: IMUX, CRBP, LONA, CNTB, RLMD, UPB, FDMT, SPRB, ACHV, VYGR, BDSX, DCTH, IVA, CRVS, ABEO, MGTX, ZVRA, SABS, ZYME, OBIO. 465 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Rubric Capital Management LP Registered adviser, Diversified active | $309,683,204 3 held | ZYME, MGTX, ABEO |
| 2 | ORBIMED ADVISORS LLC Registered adviser, Diversified active | $198,668,445 5 held | CRVS, UPB, RLMD |
| 3 | ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser, Diversified active | $170,514,356 9 held | MGTX, RLMD, FDMT |
| 4 | Sanofi Unknown, Concentrated | $164,791,426 1 held | MGTX |
| 5 | BVF INC/IL Unknown, Concentrated | $148,038,929 4 held | ZYME, FDMT, IMUX |
| 6 | RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated | $91,050,910 3 held | FDMT, SABS, CRVS |
| 7 | JOHNSON & JOHNSON Unknown, Concentrated | $89,720,774 1 held | MGTX |
| 8 | Vivo Capital, LLC Registered adviser, Diversified active | $88,352,774 3 held | CRVS, SABS, ACHV |
| 9 | Nantahala Capital Management, LLC Registered adviser, Diversified active | $71,526,307 4 held | ABEO, ZVRA, IVA |
| 10 | Venrock Adviser, LLC Registered adviser, Concentrated | $65,326,828 2 held | RLMD, ACHV |
Fund Ownership of PHAT by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 10.20% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.26% | 1,830,188 |
| Index ETFs | 7.94% | 6,420,476 |
| Active ETFs | 0.41% | 329,491 |
| Active funds | 11.64% | 9,417,528 |
| Unclassified | 0.00% | 413 |
| All registered funds | 22.25% | 17,998,096 |
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 |
|---|---|---|---|---|---|---|
| Mid Frazier Life Sciences Management, L.P. Registered adviser | $135,261,405 | 16.95% | 12,466,489 | Shares | 2026-08-14 | |
| Small Medicxi Ventures Management (Jersey) Ltd Exempt adviser | $80,990,606 | 10.15% | 7,464,572 | Shares | 2026-08-04 | |
| Mega BlackRock, Inc. Holding company | $49,097,645 | 6.15% | 4,525,129 | Shares | 2026-08-07 | |
| Mega Invesco Ltd. Adviser | $43,722,579 | 5.48% | 4,029,731 | Shares | 2026-08-14 | |
| Large Carlyle Group Inc. Registered adviser | $37,940,366 | 4.75% | 3,496,808 | Shares | 2026-08-07 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $36,627,798 | 4.59% | 3,375,834 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $28,827,842 | 3.61% | 2,656,944 | Shares | 2026-08-13 | |
| Large GW&K Investment Management, LLC Registered adviser | $23,510,192 | 2.95% | 2,166,838 | Shares | 2026-08-12 | |
| Large WASATCH ADVISORS LP Registered adviser | $21,479,753 | 2.69% | 2,942,432 | Shares | 2026-10-13 | |
| Mega FRANKLIN RESOURCES INC Adviser | $21,383,483 | 2.68% | 1,970,828 | Shares | 2026-08-13 | |
| Mid NEA Management Company, LLC Registered adviser | $21,267,833 | 2.67% | 1,960,169 | Shares | 2026-08-14 | |
| Mid 683 Capital Management, LLC Registered adviser | $20,072,500 | 2.52% | 1,850,000 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $19,291,647 | 2.42% | 1,778,032 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $17,211,604 | 2.16% | 1,586,323 | Shares | 2026-09-22 | |
| Small Catalys Pacific, LLC Exempt adviser | $16,208,315 | 2.03% | 1,493,854 | Shares | 2026-08-05 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $15,870,707 | 1.99% | 1,462,738 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $14,275,203 | 1.79% | 1,315,687 | Shares | 2026-08-12 | |
| Large Ensign Peak Advisors, Inc | $11,413,256 | 1.43% | 1,051,913 | Shares | 2026-08-14 | |
| Small Propel Bio Management, LLC Registered adviser | $11,396,384 | 1.43% | 1,050,358 | Shares | 2026-08-13 | |
| Large Point72 Asset Management, L.P. Registered adviser | $11,090,794 | 1.39% | 1,022,193 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $8,643,446 | 1.08% | 796,631 | Shares | 2026-08-13 | |
| Mid SummitTX Capital, L.P. Registered adviser | $8,566,617 | 1.07% | 789,550 | Shares | 2026-08-14 | |
| Mega HSBC HOLDINGS PLC | $7,700,190 | 0.97% | 709,695 | Shares | 2026-08-14 | |
| Mega MARSHALL WACE, LLP Exempt adviser | $7,227,076 | 0.91% | 666,090 | Shares | 2026-08-13 | |
| Mid EcoR1 Capital, LLC Registered adviser | $6,781,250 | 0.85% | 625,000 | Shares | 2026-08-14 | |
| Mid PERCEPTIVE ADVISORS LLC Registered adviser | $5,772,200 | 0.72% | 532,000 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $5,631,974 | 0.71% | 519,076 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $5,216,680 | 0.65% | 480,800 | Call | 2026-09-02 | |
| Mega NORTHERN TRUST CORP Bank | $4,972,565 | 0.62% | 458,301 | Shares | 2026-08-13 | |
| Mid StepStone Group LP Registered adviser | $4,579,622 | 0.57% | 422,085 | Shares | 2026-08-13 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $4,547,169 | 0.57% | 419,094 | Shares | 2026-08-14 | |
| Large Woodline Partners LP Registered adviser | $4,004,214 | 0.50% | 369,052 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $3,847,117 | 0.48% | 354,573 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $3,189,671 | 0.40% | 293,979 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $2,986,471 | 0.37% | 275,251 | Shares | 2026-08-12 | |
| Mid Hennion & Walsh Asset Management, Inc. Adviser | $2,864,461 | 0.36% | 392,392 | Shares | 2026-10-13 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $2,456,440 | 0.31% | 226,400 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $2,307,859 | 0.29% | 212,706 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $2,281,755 | 0.29% | 210,300 | Call | 2026-08-14 | |
| Mega UBS Group AG Bank | $2,219,615 | 0.28% | 204,573 | Shares | 2026-08-13 | |
| Large NewEdge Advisors, LLC Registered adviser | $2,212,987 | 0.28% | 203,962 | Shares | 2026-08-12 | |
| Small Avidity Partners Management LP Registered adviser | $2,170,000 | 0.27% | 200,000 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $2,169,009 | 0.27% | 199,909 | Shares | 2026-08-13 | |
| Large Jump Financial, LLC | $2,081,746 | 0.26% | 191,866 | Shares | 2026-08-13 | |
| Mid Opaleye Management Inc. Registered adviser | $2,013,640 | 0.25% | 185,589 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,006,175 | 0.25% | 184,901 | Shares | 2026-09-02 | |
| Large Trexquant Investment LP Registered adviser | $1,886,641 | 0.24% | 173,884 | Shares | 2026-08-14 | |
| Mid Simplify Asset Management Inc. Registered adviser | $1,819,649 | 0.23% | 249,267 | Shares | 2026-10-27 | |
| Small Jones Hill Capital LP Registered adviser | $1,752,123 | 0.22% | 161,486 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $1,652,593 | 0.21% | 152,313 | Shares | 2026-08-06 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $1,649,221 | 0.21% | 152,002 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $1,638,511 | 0.21% | 151,015 | Shares | 2026-08-14 | |
| Mid XTX Topco Ltd | $1,473,777 | 0.18% | 135,832 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $1,463,674 | 0.18% | 134,901 | Shares | 2026-08-14 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $1,435,280 | 0.18% | 132,284 | Shares | 2026-08-14 | |
| Small DIADEMA PARTNERS LP Registered adviser | $1,409,957 | 0.18% | 129,950 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $1,379,327 | 0.17% | 127,127 | Shares | 2026-08-11 | |
| Mid SIG BROKERAGE, LP | $1,345,400 | 0.17% | 124,000 | Call | 2026-08-14 | |
| Mid Engineers Gate Manager LP | $1,283,088 | 0.16% | 118,257 | Shares | 2026-08-14 | |
| Small Virtus Investment Advisers, LLC Registered adviser | $1,216,708 | 0.15% | 112,139 | Shares | 2026-08-11 | |
| Mega Russell Investments Group, Ltd. | $1,114,879 | 0.14% | 102,754 | Shares | 2026-08-06 | |
| Mega SCHRODER INVESTMENT MANAGEMENT GROUP Registered adviser | $1,103,933 | 0.14% | 101,745 | Shares | 2026-08-13 | |
| Mid Stratos Wealth Partners, LTD. Registered adviser | $1,085,000 | 0.14% | 100,000 | Shares | 2026-08-11 | |
| Mega Swiss National Bank | $1,071,980 | 0.13% | 98,800 | Shares | 2026-08-11 | |
| Mega D. E. Shaw & Co., Inc. | $1,037,910 | 0.13% | 95,660 | Shares | 2026-08-14 | |
| Mid GILDER GAGNON HOWE & CO LLC Registered adviser | $956,253 | 0.12% | 88,134 | Shares | 2026-08-14 | |
| Small Stonepine Capital Management, LLC Registered adviser | $922,358 | 0.12% | 85,010 | Shares | 2026-08-17 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $838,878 | 0.11% | 77,316 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $837,620 | 0.10% | 77,200 | Call | 2026-08-14 | |
| Mid Campbell & CO Investment Adviser LLC Registered adviser | $746,035 | 0.09% | 68,759 | Shares | 2026-08-03 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $713,083 | 0.09% | 65,722 | Shares | 2026-08-14 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $675,770 | 0.08% | 62,283 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $654,754 | 0.08% | 60,346 | Shares | 2026-08-12 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $605,299 | 0.08% | 55,788 | Shares | 2026-08-13 | |
| Small Birchview Capital, LP | $596,750 | 0.07% | 55,000 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $574,452 | 0.07% | 52,945 | Shares | 2026-08-03 | |
| Mega STIFEL FINANCIAL CORP | $573,226 | 0.07% | 52,832 | Shares | 2026-08-12 | |
| Mega Creative Planning Registered adviser | $572,337 | 0.07% | 52,750 | Shares | 2026-08-13 | |
| Large KBC Group NV | $563,114 | 0.07% | 77,139 | Shares | 2026-10-22 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $561,888 | 0.07% | 51,787 | Shares | 2026-08-24 | |
| Mega DEUTSCHE BANK AG\ Non-US | $544,723 | 0.07% | 50,205 | Shares | 2026-08-07 | |
| Mid Pale Fire Capital SE Holding company | $539,386 | 0.07% | 49,713 | Shares | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $534,796 | 0.07% | 49,290 | Shares | 2026-08-14 | |
| Large NOMURA HOLDINGS INC Holding company | $532,735 | 0.07% | 49,100 | Put | 2026-08-14 | |
| Large Man Group plc | $528,167 | 0.07% | 48,679 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $521,059 | 0.07% | 48,024 | Shares | 2026-08-14 | |
| Small Persistent Asset Partners Ltd Exempt adviser | $517,143 | 0.06% | 47,663 | Shares | 2026-08-07 | |
| Mid ADAR1 Capital Management, LLC Registered adviser | $465,465 | 0.06% | 42,900 | Shares | 2026-08-14 | |
| Mid Quantbot Technologies LP Registered adviser | $463,891 | 0.06% | 42,755 | Shares | 2026-08-12 | |
| Micro Penn Mutual Asset Management Registered adviser | $458,454 | 0.06% | 62,802 | Shares | 2026-10-19 | |
| Mega BARCLAYS PLC Bank | $453,280 | 0.06% | 41,777 | Shares | 2026-08-14 | |
| Large NOMURA HOLDINGS INC Holding company | $434,000 | 0.05% | 40,000 | Shares | 2026-08-14 | |
| Mid Fiduciary Trust Co | $387,681 | 0.05% | 35,731 | Shares | 2026-08-13 | |
| Large ALLSTATE CORP Insurer | $356,693 | 0.04% | 32,875 | Shares | 2026-08-13 | |
| Mega Legal & General Group Plc | $355,206 | 0.04% | 32,738 | Shares | 2026-08-14 | |
| Large Squarepoint Ops LLC Registered adviser | $342,805 | 0.04% | 31,595 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $337,435 | 0.04% | 31,100 | Put | 2026-09-02 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $326,997 | 0.04% | 30,138 | Shares | 2026-08-06 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $309,290 | 0.04% | 28,506 | Shares | 2026-08-13 | |
| Large MetLife Investment Management, LLC Registered adviser | $304,960 | 0.04% | 28,107 | Shares | 2026-08-14 |
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