PHAT Institutional Ownership & Shareholders
PHATHOM PHARMACEUTICALS INC (PHAT) is currently held by 161 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $757.07M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Frazier Life Sciences Management, L.P. is currently the largest disclosed institutional shareholder of PHAT tracked by InsiderSet, reporting ownership valued at approximately $135.26M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $70.81M, representing an estimated loss of -47.65% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 60% of the total disclosed PHAT value among the investors covered in this analysis. Major shareholders include Frazier Life Sciences Management, L.P., Medicxi Ventures Management (Jersey) Ltd, Blackrock, Inc., and several other long-term asset managers with concentrated positions in PHATHOM PHARMACEUTICALS INC (PHAT).
This page ranks the largest institutional PHAT shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
161
Total Reported Value
$757.07M
Largest Holder
Frazier Life Sciences Management, L.P.
Largest Position
$135.26M
Insider Transactions (90d)
2
Latest Filing Quarter
Q2 2026
New Institutional Positions
53
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P. | 2.95% | 12,466,489 | $135,261,406 | $70,809,658 | -$64,451,748 | -47.65% | |
| Medicxi Ventures Management (Jersey) Ltd | 43.02% | 7,464,572 | $54,491,376 | $42,398,769 | -$12,092,607 | -22.19% | |
| Blackrock, Inc. | 0.00% | 4,525,129 | $49,097,648 | $25,702,733 | -$23,394,915 | -47.65% | |
| Invesco Ltd. | 0.00% | 4,029,731 | $43,722,581 | $22,888,872 | -$20,833,709 | -47.65% | |
| Carlyle Group Inc. | 0.38% | 3,496,808 | $37,940,367 | $19,861,869 | -$18,078,498 | -47.65% | |
| Millennium Management Llc | 0.02% | 3,375,834 | $36,627,799 | $19,174,737 | -$17,453,062 | -47.65% | |
| Vanguard Capital Management Llc | 0.00% | 2,656,944 | $28,827,842 | $15,091,442 | -$13,736,400 | -47.65% | |
| Gw&K Investment Management, Llc | 0.18% | 2,166,838 | $23,510,000 | $12,307,640 | -$11,202,360 | -47.65% | |
| Wasatch Advisors Lp | 0.16% | 2,942,432 | $21,479,754 | $16,713,014 | -$4,766,740 | -22.19% | |
| Nea Management Company, Llc | 1.34% | 1,960,169 | $21,267,834 | $11,133,760 | -$10,134,074 | -47.65% | |
| 683 Capital Management, Llc | 1.85% | 1,850,000 | $20,072,501 | $10,508,000 | -$9,564,501 | -47.65% | |
| Goldman Sachs Group Inc | 0.00% | 1,778,032 | $19,291,647 | $10,099,222 | -$9,192,425 | -47.65% | |
| Ensign Peak Advisors, Inc | 0.03% | 1,627,806 | $18,084,925 | $9,245,938 | -$8,838,987 | -48.87% | |
| State Street Corp | 0.00% | 1,586,323 | $17,211,605 | $9,010,315 | -$8,201,290 | -47.65% | |
| Nomura Asset Management International Inc. | 0.02% | 1,462,738 | $15,871,000 | $8,308,352 | -$7,562,648 | -47.65% | |
| Geode Capital Management, Llc | 0.00% | 1,315,687 | $14,277,589 | $7,473,102 | -$6,804,487 | -47.66% | |
| Catalys Pacific, Llc | 6.55% | 1,882,039 | $13,738,885 | $10,689,982 | -$3,048,903 | -22.19% | |
| Catalio Capital Management, Lp | 2.05% | 698,996 | $11,596,344 | $3,970,297 | -$7,626,047 | -65.76% | |
| Propel Bio Management, Llc | 5.96% | 1,050,358 | $11,396,384 | $5,966,033 | -$5,430,351 | -47.65% | |
| Point72 Asset Management, L.P. | 0.02% | 1,022,193 | $11,090,794 | $5,806,056 | -$5,284,738 | -47.65% | |
| Vanguard Portfolio Management Llc | 0.00% | 796,631 | $8,643,446 | $4,524,864 | -$4,118,582 | -47.65% | |
| Summittx Capital, L.P. | 0.23% | 789,550 | $8,566,618 | $4,484,644 | -$4,081,974 | -47.65% | |
| Hsbc Holdings Plc | 0.00% | 709,695 | $7,701,936 | $4,031,068 | -$3,670,868 | -47.66% | |
| Marshall Wace, Llp | 0.01% | 666,090 | $7,227,078 | $3,783,391 | -$3,443,687 | -47.65% | |
| Ecor1 Capital, Llc | 0.34% | 625,000 | $6,781,250 | $3,550,000 | -$3,231,250 | -47.65% | |
| Perceptive Advisors Llc | 0.09% | 532,000 | $5,772,200 | $3,021,760 | -$2,750,440 | -47.65% | |
| Two Sigma Investments, Lp | 0.00% | 519,076 | $5,631,975 | $2,948,352 | -$2,683,623 | -47.65% | |
| Northern Trust Corp | 0.00% | 458,301 | $4,972,565 | $2,603,150 | -$2,369,415 | -47.65% | |
| Stepstone Group Lp | 0.21% | 422,085 | $4,579,622 | $2,397,443 | -$2,182,179 | -47.65% | |
| Charles Schwab Investment Management Inc | 0.00% | 419,094 | $4,547,170 | $2,380,454 | -$2,166,716 | -47.65% | |
| Woodline Partners Lp | 0.01% | 369,052 | $4,004,214 | $2,096,215 | -$1,907,999 | -47.65% | |
| Vanguard Fiduciary Trust Co | 0.00% | 354,573 | $3,847,117 | $2,013,975 | -$1,833,142 | -47.65% | |
| Ameriprise Financial Inc | 0.00% | 293,979 | $3,189,673 | $1,669,801 | -$1,519,872 | -47.65% | |
| Jpmorgan Chase & Co | 0.00% | 275,251 | $2,991,978 | $1,563,426 | -$1,428,552 | -47.75% | |
| Hennion & Walsh Asset Management, Inc. | 0.08% | 392,392 | $2,864,462 | $2,228,787 | -$635,675 | -22.19% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 226,400 | $2,456,440 | $1,285,952 | -$1,170,488 | -47.65% |
| Jane Street Group, Llc | 0.00% | 212,706 | $2,307,860 | $1,208,170 | -$1,099,690 | -47.65% | |
| Ubs Group Ag | 0.00% | 204,573 | $2,219,618 | $1,161,975 | -$1,057,643 | -47.65% | |
| Newedge Advisors, Llc | 0.01% | 203,962 | $2,212,988 | $1,158,504 | -$1,054,484 | -47.65% | |
| Avidity Partners Management Lp | 0.35% | 200,000 | $2,170,000 | $1,136,000 | -$1,034,000 | -47.65% | |
| Morgan Stanley | 0.00% | 199,909 | $2,169,013 | $1,135,483 | -$1,033,530 | -47.65% | |
| Jump Financial, Llc | 0.02% | 191,866 | $2,081,746 | $1,089,799 | -$991,947 | -47.65% | |
| Opaleye Management Inc. | 0.18% | 185,589 | $2,013,641 | $1,054,146 | -$959,495 | -47.65% | |
| Citadel Advisors Llc | 0.00% | 184,901 | $2,006,176 | $1,050,238 | -$955,938 | -47.65% | |
| Trexquant Investment Lp | 0.01% | 173,884 | $1,886,641 | $987,661 | -$898,980 | -47.65% | |
| Simplify Asset Management Inc. | 0.03% | 249,267 | $1,819,649 | $1,415,837 | -$403,812 | -22.19% | |
| Jones Hill Capital Lp | 0.37% | 161,486 | $1,752,123 | $917,240 | -$834,883 | -47.65% | |
| Bank Of New York Mellon Corp | 0.00% | 152,313 | $1,652,595 | $865,138 | -$787,457 | -47.65% | |
| Wells Fargo & Company/Mn | 0.00% | 152,002 | $1,649,221 | $863,371 | -$785,850 | -47.65% | |
| Bank Of America Corp | 0.00% | 151,015 | $1,638,513 | $857,765 | -$780,748 | -47.65% |
Frequently asked questions about PHAT
Who are the largest institutional holders of PHAT?
The largest institutional holders of PHAT reported in the latest SEC Form 13F filings include Frazier Life Sciences Management, L.P., Medicxi Ventures Management (Jersey) Ltd, Blackrock, Inc., Invesco Ltd., and Carlyle Group Inc.. InsiderSet ranks institutional holders by their latest reported PHAT position.
What is PHAT institutional ownership?
This page tracks PHAT positions reported by institutional investment managers through SEC Form 13F. PHATHOM PHARMACEUTICALS INC (PHAT) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own PHAT?
InsiderSet currently tracks 161 institutional managers reporting PHAT holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of PHAT shareholders.
How much PHAT stock do institutions own?
Institutional investment managers disclosed approximately $757.07M in PHAT holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was PHAT institutional ownership last updated?
The latest PHAT institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional PHAT holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its PHAT position after the reporting date.
Are institutions buying or selling PHAT?
Institutional buying and selling can be analyzed by comparing PHAT positions across consecutive 13F reporting periods. InsiderSet's PHAT Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View PHAT ownership changes.
How has PHAT institutional ownership changed over time?
InsiderSet tracks PHAT institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.