FLORHAM PARK, NJ
PHATHOM PHARMACEUTICALS, INC.PHAT— Latest position per institution from SEC 13F filings
15
Institutional holders
68.33M
Total shares held
738.40M
Estimated value
3.42M
Avg. position size
FRAZIER LIFE SCIENCES MANAGEMENT, L.P.
CIK 1892134
Shares
12.47M
Value
138.50M
Filed
Mar 31, 2026
MEDICXI VENTURES MANAGEMENT (JERSEY) LTD
CIK 1715579
Shares
7.46M
Value
82.93M
Filed
Mar 31, 2026
JENNISON ASSOCIATES LLC
CIK 53417
Shares
7.04M
Value
44.16M
Filed
Mar 31, 2025
INVESCO LTD.
CIK 914208
Shares
4.32M
Value
48.02M
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
4.06M
Value
45.13M
Filed
Mar 31, 2026
MILLENNIUM MANAGEMENT LLC
CIK 1273087
Shares
4.02M
Value
44.69M
Filed
Mar 31, 2026
CARLYLE GROUP INC.
CIK 1527166
Shares
3.50M
Value
38.85M
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
3.18M
Value
52.71M
Filed
Dec 31, 2025
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
2.93M
Value
30.14M
Filed
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
2.58M
Value
28.70M
Filed
Mar 31, 2026
CHECKPOINT CAPITAL L.P.
CIK 1977548
Shares
2.27M
Value
18.47M
Filed
Dec 31, 2024
NEA MANAGEMENT COMPANY, LLC
CIK 1512848
Shares
1.96M
Value
21.78M
Filed
Mar 31, 2026
683 CAPITAL MANAGEMENT, LLC
CIK 1404574
Shares
1.85M
Value
20.55M
Filed
Mar 31, 2026
PORTOLAN CAPITAL MANAGEMENT, LLC
CIK 1350290
Shares
1.70M
Value
30.73M
Filed
Sep 30, 2024
ENSIGN PEAK ADVISORS, INC
CIK 1454984
Shares
1.63M
Value
18.08M
Filed
Mar 31, 2026
TAKEDA PHARMACEUTICAL CO LTD
CIK 1395064
Shares
1.56M
Value
16.04M
Filed
Jun 30, 2024
CATALYS PACIFIC, LLC
CIK 2011385
Shares
1.49M
Value
16.60M
Filed
Mar 31, 2026
ORBIMED ADVISORS LLC
CIK 1055951
Shares
1.45M
Value
26.20M
Filed
Sep 30, 2024
ABINGWORTH LLP
CIK 1397144
Shares
1.44M
Value
16.10M
Filed
Dec 31, 2022
GW&K INVESTMENT MANAGEMENT, LLC
CIK 1082917
Shares
1.42M
Value
15.79K
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | FRAZIER LIFE SCIENCES MANAGEMENT, L.P. | 1892134 | 12.47M | 138.50M | Mar 31, 2026 |
| 2 | MEDICXI VENTURES MANAGEMENT (JERSEY) LTD | 1715579 | 7.46M | 82.93M | Mar 31, 2026 |
| 3 | JENNISON ASSOCIATES LLC | 53417 | 7.04M | 44.16M | Mar 31, 2025 |
| 4 | INVESCO LTD. | 914208 | 4.32M | 48.02M | Mar 31, 2026 |
| 5 | BLACKROCK, INC. | 2012383 | 4.06M | 45.13M | Mar 31, 2026 |
| 6 | MILLENNIUM MANAGEMENT LLC | 1273087 | 4.02M | 44.69M | Mar 31, 2026 |
| 7 | CARLYLE GROUP INC. | 1527166 | 3.50M | 38.85M | Mar 31, 2026 |
| 8 | VANGUARD GROUP INC | 102909 | 3.18M | 52.71M | Dec 31, 2025 |
| 9 | BLACKROCK FINANCE, INC. | 1364742 | 2.93M | 30.14M | Jun 30, 2024 |
| 10 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 2.58M | 28.70M | Mar 31, 2026 |
| 11 | CHECKPOINT CAPITAL L.P. | 1977548 | 2.27M | 18.47M | Dec 31, 2024 |
| 12 | NEA MANAGEMENT COMPANY, LLC | 1512848 | 1.96M | 21.78M | Mar 31, 2026 |
| 13 | 683 CAPITAL MANAGEMENT, LLC | 1404574 | 1.85M | 20.55M | Mar 31, 2026 |
| 14 | PORTOLAN CAPITAL MANAGEMENT, LLC | 1350290 | 1.70M | 30.73M | Sep 30, 2024 |
| 15 | ENSIGN PEAK ADVISORS, INC | 1454984 | 1.63M | 18.08M | Mar 31, 2026 |
| 16 | TAKEDA PHARMACEUTICAL CO LTD | 1395064 | 1.56M | 16.04M | Jun 30, 2024 |
| 17 | CATALYS PACIFIC, LLC | 2011385 | 1.49M | 16.60M | Mar 31, 2026 |
| 18 | ORBIMED ADVISORS LLC | 1055951 | 1.45M | 26.20M | Sep 30, 2024 |
| 19 | ABINGWORTH LLP | 1397144 | 1.44M | 16.10M | Dec 31, 2022 |
| 20 | GW&K INVESTMENT MANAGEMENT, LLC | 1082917 | 1.42M | 15.79K | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.