MEREO BIOPHARMA GROUP PL-ADR (MREO) Institutional Shareholders
MEREO BIOPHARMA GROUP PL-ADR (MREO) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $17.98M in MREO holdings during the latest filing period.
Rubric Capital Management Lp is currently the largest disclosed institutional shareholder of MREO tracked by InsiderSet, reporting ownership valued at approximately $4.86M 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 $4.64M, representing an estimated loss of -4.63% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 93% of the total disclosed MREO value among the investors covered in this analysis. Major shareholders include Rubric Capital Management Lp, 683 Capital Management, Llc, Bank Of America Corp, and several other long-term asset managers with concentrated positions in MEREO BIOPHARMA GROUP PL-ADR (MREO).
This page ranks the largest institutional MREO 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
55
Total Reported Value
$17.98M
Largest Holder
Rubric Capital Management Lp
Largest Position
$4.86M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
95
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Rubric Capital Management Lp | 0.04% | 15,307,347 | $4,863,144 | $4,638,126 | -$225,018 | -4.63% | |
| 683 Capital Management, Llc | 0.34% | 11,777,856 | $3,741,825 | $3,568,690 | -$173,135 | -4.63% | |
| Bank Of America Corp | 0.00% | 8,195,281 | $2,597,904 | $2,483,170 | -$114,734 | -4.42% | |
| Defilade Capital Management, L.P. | 0.32% | 7,558,756 | $2,401,417 | $2,290,303 | -$111,114 | -4.63% | |
| Newtyn Management, Llc | 0.12% | 3,000,000 | $953,100 | $909,000 | -$44,100 | -4.63% | |
| Tejara Capital Ltd | 0.27% | 2,037,520 | $647,320 | $617,369 | -$29,951 | -4.63% | |
| Ubs Group Ag | 0.00% | 1,447,627 | $460,346 | $438,631 | -$21,715 | -4.72% | |
| Two Sigma Investments, Lp | 0.00% | 1,319,241 | $419,123 | $399,730 | -$19,393 | -4.63% | |
| Ecor1 Capital, Llc | 0.02% | 1,000,000 | $317,700 | $303,000 | -$14,700 | -4.63% | |
| Jane Street Group, Llc | 0.00% | 774,944 | $246,200 | $234,808 | -$11,392 | -4.63% | |
| Ishara Investments Lp | 0.18% | 768,750 | $244,232 | $232,931 | -$11,301 | -4.63% | |
| Wealthspire Advisors, Llc | 0.00% | 765,000 | $243,041 | $231,795 | -$11,246 | -4.63% | |
| Citadel Advisors Llc | 0.00% | 444,158 | $141,109 | $134,580 | -$6,529 | -4.63% | |
| Rangeley Capital, Llc | 0.10% | 329,200 | $104,587 | $99,748 | -$4,839 | -4.63% | |
| Susquehanna International Group, Llp | 0.00% | 213,270 | $67,756 | $64,621 | -$3,135 | -4.63% | |
| Marshall Wace, Llp | 0.00% | 179,884 | $57,563 | $54,505 | -$3,058 | -5.31% | |
| Xtx Topco Ltd | 0.00% | 174,481 | $55,433 | $52,868 | -$2,565 | -4.63% | |
| Group One Trading Llc | 0.00% | 167,515 | $53,220 | $50,757 | -$2,463 | -4.63% | |
| State Street Corp | 0.00% | 134,772 | $42,817 | $40,836 | -$1,981 | -4.63% | |
| Nomura Holdings Inc | 0.00% | 104,361 | $33,155 | $31,621 | -$1,534 | -4.63% | |
| James J. Burns & Company, Llc | 0.00% | 95,400 | $30,309 | $28,906 | -$1,403 | -4.63% | |
| Quarry Lp | 0.00% | 93,750 | $29,784 | $28,406 | -$1,378 | -4.63% | |
| Goldman Sachs Group Inc | 0.00% | 85,180 | $27,062 | $25,810 | -$1,252 | -4.63% | |
| Jmn Financial Llc | 0.02% | 76,748 | $24,383 | $23,255 | -$1,128 | -4.63% | |
| Blackrock, Inc. | 0.00% | 69,678 | $22,137 | $21,112 | -$1,025 | -4.63% | |
| Jpmorgan Chase & Co | 0.00% | 58,531 | $19,421 | $17,735 | -$1,686 | -8.68% | |
| Virtu Financial Llc | 0.00% | 61,285 | $19,000 | $18,569 | -$431 | -2.27% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 52,100 | $16,552 | $15,786 | -$766 | -4.63% |
| Significant Wealth Partners Llc | 0.01% | 32,677 | $10,382 | $9,901 | -$481 | -4.63% | |
| Clear Harbor Asset Management, Llc | 0.00% | 32,000 | $10,083 | $9,696 | -$387 | -3.84% | |
| Rhumbline Advisers | 0.00% | 26,784 | $8,511 | $8,116 | -$395 | -4.65% | |
| Centiva Capital, Lp | 0.00% | 25,000 | $7,943 | $7,575 | -$368 | -4.63% | |
| Engineers Gate Manager Lp | 0.00% | 23,953 | $7,610 | $7,258 | -$352 | -4.63% | |
| Simplex Trading, Llc | 0.00% | 18,780 | $5,972 | $5,690 | -$282 | -4.72% | |
| Nfsg Corp | 0.00% | 18,750 | $5,957 | $5,681 | -$276 | -4.63% | |
| Onedigital Investment Advisors Llc | 0.00% | 18,300 | $5,814 | $5,545 | -$269 | -4.63% | |
| Morgan Stanley | 0.00% | 16,731 | $5,317 | $5,069 | -$248 | -4.66% | |
| Iht Wealth Management, Llc | 0.00% | 15,000 | $4,766 | $4,545 | -$221 | -4.64% | |
| Two Sigma Securities, Llc | 0.00% | 12,900 | $4,098 | $3,909 | -$189 | -4.62% | |
| J. Safra Sarasin Holding Ag | 0.00% | 12,841 | $4,081 | $3,891 | -$190 | -4.66% | |
| Sg Americas Securities, Llc | 0.00% | 12,802 | $4,000 | $3,879 | -$121 | -3.02% | |
| Mml Investors Services, Llc | 0.00% | 12,200 | $3,876 | $3,697 | -$179 | -4.63% | |
| World Investment Advisors | 0.00% | 10,000 | $3,300 | $3,030 | -$270 | -8.18% | |
| Astoria Portfolio Advisors Llc. | 0.00% | 10,000 | $3,177 | $3,030 | -$147 | -4.63% | |
| Gamma Investing Llc | 0.00% | 9,308 | $2,957 | $2,820 | -$137 | -4.62% | |
| Arax Advisory Partners | 0.00% | 5,819 | $1,849 | $1,763 | -$86 | -4.64% | |
| Rockefeller Capital Management L.P. | 0.00% | 2,000 | $635 | $606 | -$29 | -4.57% | |
| Osaic Holdings, Inc. | 0.00% | 1,500 | $479 | $455 | -$25 | -5.11% | |
| Allworth Financial Lp | 0.00% | 1,500 | $477 | $455 | -$23 | -4.72% | |
| New England Capital Financial Advisors Llc | 0.00% | 300 | $96 | $91 | -$5 | -5.31% |
Frequently asked questions about MREO
Who owns the most MREO stock?
The largest holders of MREO are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MEREO BIOPHARMA GROUP PL-ADR (MREO).
Is MREO widely held by superinvestors?
Many widely followed stocks like MREO appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MREO is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.