MEREO BIOPHARMA GROUP PL-ADR (MREO) Top 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 March 31, 2026. The institutional investors covered on this page collectively reported approximately $24.79M 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 $5.05M in its March 31, 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 $4.75M, representing an estimated loss of -6.06% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 95% of the total disclosed MREO value among the investors covered in this analysis. Major shareholders include Rubric Capital Management Lp, Ecor1 Capital, Llc, 683 Capital Management, Llc, 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
60
Total Reported Value
$24.79M
Largest Holder
Rubric Capital Management Lp
Largest Position
$5.05M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
83
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 | 0.06% | 15,307,347 | $5,051,425 | $4,745,278 | -$306,147 | -6.06% | |
| Ecor1 Capital, Llc | 0.19% | 13,368,855 | $4,411,722 | $4,144,345 | -$267,377 | -6.06% | |
| 683 Capital Management, Llc | 0.37% | 12,000,000 | $3,960,000 | $3,720,000 | -$240,000 | -6.06% | |
| Bank Of America Corp | 0.00% | 8,195,287 | $2,704,445 | $2,540,539 | -$163,906 | -6.06% | |
| Defilade Capital Management, L.P. | 0.35% | 7,558,756 | $2,494,389 | $2,343,214 | -$151,175 | -6.06% | |
| Newtyn Management, Llc | 0.25% | 7,079,056 | $2,336,088 | $2,194,507 | -$141,581 | -6.06% | |
| Millennium Management Llc | 0.00% | 3,559,103 | $1,174,504 | $1,103,322 | -$71,182 | -6.06% | |
| Tejara Capital Ltd | 0.22% | 2,037,520 | $672,382 | $631,631 | -$40,751 | -6.06% | |
| Ubs Group Ag | 0.00% | 1,490,128 | $491,742 | $461,940 | -$29,802 | -6.06% | |
| Wealthspire Advisors, Llc | 0.00% | 796,036 | $262,692 | $246,771 | -$15,921 | -6.06% | |
| Marshall Wace, Llp | 0.00% | 686,987 | $226,706 | $212,966 | -$13,740 | -6.06% | |
| Group One Trading Llc | 0.00% | 335,827 | $110,823 | $104,106 | -$6,717 | -6.06% | |
| Rangeley Capital, Llc | 0.12% | 329,200 | $108,636 | $102,052 | -$6,584 | -6.06% | |
| Blackrock, Inc. | 0.00% | 302,991 | $99,986 | $93,927 | -$6,059 | -6.06% | |
| Knott David M Jr | 0.06% | 300,337 | $99,111 | $93,104 | -$6,007 | -6.06% | |
| Susquehanna International Group, Llp | 0.00% | 195,920 | $64,654 | $60,735 | -$3,919 | -6.06% | |
| Two Sigma Investments, Lp | 0.00% | 187,839 | $61,987 | $58,230 | -$3,757 | -6.06% | |
| Adar1 Capital Management, Llc | 0.00% | 150,000 | $49,500 | $46,500 | -$3,000 | -6.06% | |
| Jane Street Group, Llc | 0.00% | 139,973 | $46,191 | $43,392 | -$2,799 | -6.06% | |
| State Street Corp | 0.00% | 133,379 | $44,015 | $41,347 | -$2,668 | -6.06% | |
| Forefront Analytics, Llc | 0.04% | 127,778 | $42,167 | $39,611 | -$2,556 | -6.06% | |
| Virtus Investment Advisers, Llc | 0.01% | 125,662 | $41,468 | $38,955 | -$2,513 | -6.06% | |
| Geode Capital Management, Llc | 0.00% | 92,534 | $30,536 | $28,686 | -$1,850 | -6.06% | |
| Xtx Topco Ltd | 0.00% | 84,469 | $27,875 | $26,185 | -$1,690 | -6.06% | |
| Caption Management, Llc | 0.00% | 64,064 | $21,141 | $19,860 | -$1,281 | -6.06% | |
| Smartharvest Portfolios, Llc | 0.01% | 49,512 | $16,339 | $15,349 | -$990 | -6.06% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 48,400 | $15,972 | $15,004 | -$968 | -6.06% |
| Stonex Group Inc. | 0.00% | 36,873 | $12,168 | $11,431 | -$737 | -6.06% | |
| Independent Advisor Alliance | 0.00% | 35,227 | $11,625 | $10,920 | -$705 | -6.06% | |
| Clear Harbor Asset Management, Llc | 0.00% | 35,000 | $11,550 | $10,850 | -$700 | -6.06% | |
| Significant Wealth Partners Llc | 0.01% | 25,634 | $8,459 | $7,947 | -$512 | -6.06% | |
| Centiva Capital, Lp | 0.00% | 25,000 | $8,250 | $7,750 | -$500 | -6.06% | |
| Engineers Gate Manager Lp | 0.00% | 23,954 | $7,905 | $7,426 | -$479 | -6.06% | |
| Rhumbline Advisers | 0.00% | 19,572 | $6,452 | $6,067 | -$385 | -5.96% | |
| Gamma Investing Llc | 0.00% | 19,274 | $6,360 | $5,975 | -$385 | -6.05% | |
| Three Magnolias Financial Advisors, Llc | 0.00% | 19,000 | $6,270 | $5,890 | -$380 | -6.06% | |
| Nfsg Corp | 0.00% | 18,750 | $6,188 | $5,813 | -$376 | -6.07% | |
| Onedigital Investment Advisors Llc | 0.00% | 18,300 | $6,039 | $5,673 | -$366 | -6.06% | |
| Morgan Stanley | 0.00% | 16,425 | $5,420 | $5,092 | -$328 | -6.06% | |
| Iht Wealth Management, Llc | 0.00% | 15,000 | $4,950 | $4,650 | -$300 | -6.06% | |
| Mml Investors Services, Llc | 0.00% | 12,200 | $4,026 | $3,782 | -$244 | -6.06% | |
| World Investment Advisors | 0.00% | 10,000 | $3,300 | $3,100 | -$200 | -6.06% | |
| Astoria Portfolio Advisors Llc. | 0.00% | 10,000 | $2,802 | $3,100 | +$298 | +10.64% | |
| Baader Bank Aktiengesellschaft | 0.00% | 12,330 | $2,672 | $3,822 | +$1,150 | +43.05% | |
| Arax Advisory Partners | 0.00% | 4,000 | $1,320 | $1,240 | -$80 | -6.06% | |
| Barclays Plc | 0.00% | 2,496 | $824 | $774 | -$50 | -6.10% | |
| Rockefeller Capital Management L.P. | 0.00% | 2,000 | $660 | $620 | -$40 | -6.06% | |
| Allworth Financial Lp | 0.00% | 1,500 | $495 | $465 | -$30 | -6.06% | |
| Osaic Holdings, Inc. | 0.00% | 1,500 | $495 | $465 | -$30 | -6.06% | |
| Mai Capital Management | 0.00% | 309 | $102 | $96 | -$6 | -6.09% |
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.