Affinity Asset Advisors, LLC
· Added
Change
+1.3M
Date
Q1 2026
EP
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Affinity Asset Advisors, LLC
· Added
Change
+1.3M
Date
Q1 2026
|
Affinity Asset Advisors, LLC | Added· Q1 2026 | – | +1.3M | – | Q1 2026 | |||||
|
Redmile Group, LLC
· New
Change
+700K
Date
Q1 2026
|
Redmile Group, LLC | New· Q1 2026 | – | +700K | – | Q1 2026 | |||||
|
Rubric Capital Management LP
· New
Change
+691K
Date
Q1 2026
|
Rubric Capital Management LP | New· Q1 2026 | – | +691K | – | Q1 2026 | |||||
|
Ikarian Capital, LLC
· Added
Change
+605K
Date
Q1 2026
|
Ikarian Capital, LLC | Added· Q1 2026 | – | +605K | – | Q1 2026 | |||||
|
UBS Group AG
· Added
Change
+543K
Date
Q1 2026
|
UBS Group AG | Added· Q1 2026 | – | +543K | – | Q1 2026 | |||||
|
Pfm Health Sciences, LP
· New
Change
+541K
Date
Q1 2026
|
Pfm Health Sciences, LP | New· Q1 2026 | – | +541K | – | Q1 2026 | |||||
|
Ameriprise Financial Inc
· New
Change
+524K
Date
Q1 2026
|
Ameriprise Financial Inc | New· Q1 2026 | – | +524K | – | Q1 2026 | |||||
|
Woodline Partners LP
· New
Change
+441K
Date
Q1 2026
|
Woodline Partners LP | New· Q1 2026 | – | +441K | – | Q1 2026 | |||||
|
Seven Fleet Capital Management LP
· New
Change
+434K
Date
Q1 2026
|
Seven Fleet Capital Management LP | New· Q1 2026 | – | +434K | – | Q1 2026 | |||||
|
Alyeska Investment Group, L.P.
· New
Change
+375K
Date
Q1 2026
|
Alyeska Investment Group, L.P. | New· Q1 2026 | – | +375K | – | Q1 2026 | |||||
|
Aisling Capital Management LP
· New
Change
+325K
Date
Q1 2026
|
Aisling Capital Management LP | New· Q1 2026 | – | +325K | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Exited
Change
−278K
Δ Own
−100.0%
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Exited· Q1 2026 | – | −278K | −100.0% | Q1 2026 | |||||
|
Dv Trading LLC
· New
Change
+276K
Date
Q1 2026
|
Dv Trading LLC | New· Q1 2026 | – | +276K | – | Q1 2026 | |||||
|
Ally Bridge Group (ny) LLC
· Added
Change
+262K
Date
Q1 2026
|
Ally Bridge Group (ny) LLC | Added· Q1 2026 | – | +262K | – | Q1 2026 | |||||
|
Point72 Asset Management, L.P.
· Added
Change
+255K
Δ Own
+35.9%
Date
Q1 2026
|
Point72 Asset Management, L.P. | Added· Q1 2026 | – | +255K | +35.9% | Q1 2026 | |||||
N
A
M
T
A
M
50 reporting institutions disclosed EPRX position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.