MEREO BIOPHARMA GROUP PLCMREO— Latest position per institution from SEC 13F filings
15
Institutional holders
146.62M
Total shares held
159.18M
Estimated value
7.33M
Avg. position size
JANUS HENDERSON GROUP PLC
CIK 1274173
Shares
16.29M
Value
33.64M
Filed
Sep 30, 2025
RUBRIC CAPITAL MANAGEMENT LP
CIK 1687509
Shares
15.31M
Value
5.05M
Filed
Mar 31, 2026
ECOR1 CAPITAL, LLC
CIK 1587114
Shares
13.37M
Value
4.41M
Filed
Mar 31, 2026
683 CAPITAL MANAGEMENT, LLC
CIK 1404574
Shares
12M
Value
3.96M
Filed
Mar 31, 2026
FRAZIER LIFE SCIENCES MANAGEMENT, L.P.
CIK 1892134
Shares
9.44M
Value
19.45M
Filed
Sep 30, 2025
BANK OF AMERICA CORP /DE/
CIK 70858
Shares
8.20M
Value
2.70M
Filed
Mar 31, 2026
MANGROVE PARTNERS IM, LLC
CIK 1535392
Shares
7.79M
Value
16.05M
Filed
Sep 30, 2025
ORBIMED ADVISORS LLC
CIK 1055951
Shares
7.75M
Value
5.48M
Filed
Mar 31, 2023
DEFILADE CAPITAL MANAGEMENT, L.P.
CIK 2088557
Shares
7.56M
Value
2.49M
Filed
Mar 31, 2026
NEWTYN MANAGEMENT, LLC
CIK 1569241
Shares
7.08M
Value
2.34M
Filed
Mar 31, 2026
DEERFIELD MANAGEMENT COMPANY, L.P.
CIK 1009258
Shares
6.71M
Value
18.19M
Filed
Jun 30, 2025
SCHONFELD STRATEGIC ADVISORS LLC
CIK 1665241
Shares
6.09M
Value
2.54M
Filed
Dec 31, 2025
ABERDEEN GROUP PLC
CIK 1716774
Shares
5.54M
Value
11.41M
Filed
Sep 30, 2025
ROCK SPRINGS CAPITAL MANAGEMENT LP
CIK 1595725
Shares
4.57M
Value
9.42M
Filed
Sep 30, 2025
CLEARLINE CAPITAL LP
CIK 1600136
Shares
3.83M
Value
7.90M
Filed
Sep 30, 2025
ALKEON CAPITAL MANAGEMENT LLC
CIK 1230239
Shares
3.70M
Value
7.62M
Filed
Sep 30, 2025
MILLENNIUM MANAGEMENT LLC
CIK 1273087
Shares
3.56M
Value
1.17M
Filed
Mar 31, 2026
BAKER BROS. ADVISORS LP
CIK 1263508
Shares
3.55M
Value
4.69M
Filed
Jun 30, 2023
BOXER CAPITAL, LLC
CIK 1465837
Shares
2.25M
Value
2.97K
Filed
Jun 30, 2023
TEJARA CAPITAL LTD
CIK 1879713
Shares
2.04M
Value
672.38K
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | JANUS HENDERSON GROUP PLC | 1274173 | 16.29M | 33.64M | Sep 30, 2025 |
| 2 | RUBRIC CAPITAL MANAGEMENT LP | 1687509 | 15.31M | 5.05M | Mar 31, 2026 |
| 3 | ECOR1 CAPITAL, LLC | 1587114 | 13.37M | 4.41M | Mar 31, 2026 |
| 4 | 683 CAPITAL MANAGEMENT, LLC | 1404574 | 12M | 3.96M | Mar 31, 2026 |
| 5 | FRAZIER LIFE SCIENCES MANAGEMENT, L.P. | 1892134 | 9.44M | 19.45M | Sep 30, 2025 |
| 6 | BANK OF AMERICA CORP /DE/ | 70858 | 8.20M | 2.70M | Mar 31, 2026 |
| 7 | MANGROVE PARTNERS IM, LLC | 1535392 | 7.79M | 16.05M | Sep 30, 2025 |
| 8 | ORBIMED ADVISORS LLC | 1055951 | 7.75M | 5.48M | Mar 31, 2023 |
| 9 | DEFILADE CAPITAL MANAGEMENT, L.P. | 2088557 | 7.56M | 2.49M | Mar 31, 2026 |
| 10 | NEWTYN MANAGEMENT, LLC | 1569241 | 7.08M | 2.34M | Mar 31, 2026 |
| 11 | DEERFIELD MANAGEMENT COMPANY, L.P. | 1009258 | 6.71M | 18.19M | Jun 30, 2025 |
| 12 | SCHONFELD STRATEGIC ADVISORS LLC | 1665241 | 6.09M | 2.54M | Dec 31, 2025 |
| 13 | ABERDEEN GROUP PLC | 1716774 | 5.54M | 11.41M | Sep 30, 2025 |
| 14 | ROCK SPRINGS CAPITAL MANAGEMENT LP | 1595725 | 4.57M | 9.42M | Sep 30, 2025 |
| 15 | CLEARLINE CAPITAL LP | 1600136 | 3.83M | 7.90M | Sep 30, 2025 |
| 16 | ALKEON CAPITAL MANAGEMENT LLC | 1230239 | 3.70M | 7.62M | Sep 30, 2025 |
| 17 | MILLENNIUM MANAGEMENT LLC | 1273087 | 3.56M | 1.17M | Mar 31, 2026 |
| 18 | BAKER BROS. ADVISORS LP | 1263508 | 3.55M | 4.69M | Jun 30, 2023 |
| 19 | BOXER CAPITAL, LLC | 1465837 | 2.25M | 2.97K | Jun 30, 2023 |
| 20 | TEJARA CAPITAL LTD | 1879713 | 2.04M | 672.38K | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.