Security key
589492107
Mereo BioPharma Group plc - Ordinary Shares (MREO)
CUSIP: 589492107
Q1 2021 13F Holders as of 31 Mar 2021
- Security type / class
- Equity / Ordinary Shares
- Total 13F shares
- 90,226,943
- Total 13F value
- $304,106,740
- Share change
- +33,088,323
- Put/Call ratio
- 120%
- SEC-reported price per share
- $3.37
- Number of holders
- 64
- Value change
- +$110,829,354
- Number of buys
- 46
- Number of sells
- 17
- Shares outstanding
- 795,765,179
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2021
Institutions
64
Top holders
10
MREO full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
Mereo BioPharma Group plc SEC filings
Mereo BioPharma Group plc company facts
Broader feeds
Reporting periods
Holder history for CUSIP 589492107
Recent filing periods:
Ownership snapshot
Top reported holders of MREO - Mereo BioPharma Group plc - Ordinary Shares (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Boxer Capital, LLC
Disclosed value leader
Boxer Capital, LLC
Comparable rows
15/15
Latest evidence
31 Dec 2020
13F
Lead comparable stake: 0.78%
Showing 1-6 of 15 holder rows.
Quick read
Boxer Capital, LLC leads the comparable SEC ownership view at 0.78%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Boxer Capital, LLC's linked filing trail.
Comparable ownership
Top 5
Boxer Capital, LLC
0.78%
BAKER BROS. ADVISORS LP
0.76%
Vivo Capital, LLC
0.53%
CITADEL ADVISORS LLC
0.52%
HHLR ADVISORS, LTD.
0.37%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Boxer Capital, LLC |
13F
Company
|
0.78%
|
$22,291,000
6,226,673 shares
|
— | 31 Dec 2020 |
| BAKER BROS. ADVISORS LP |
13F
Company
|
0.76%
|
$21,588,000
6,030,293 shares
|
— | 31 Dec 2020 |
| Vivo Capital, LLC |
13F
Company
|
0.53%
|
$15,111,000
4,220,938 shares
|
— | 31 Dec 2020 |
| CITADEL ADVISORS LLC |
13F
Company
|
0.52%
|
$14,733,000
4,115,455 shares
|
— | 31 Dec 2020 |
| HHLR ADVISORS, LTD. |
13F
Company
|
0.37%
|
$10,655,000
2,976,121 shares
|
— | 31 Dec 2020 |
| SUVRETTA CAPITAL MANAGEMENT, LLC |
13F
Company
|
0.35%
|
$9,841,000
2,748,999 shares
|
— | 31 Dec 2020 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
64
Shares
90,226,943
Rows available
64
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2021 vs Q1 2021 Across Filers
Q1 2021 holders
64
Q1 2021 holders
64
Holder diff
0
| Investor | Q1 2021 Shares | Q1 2021 Shares | Share Diff | Share Chg % | Q1 2021 value | Q1 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend