$MREO

$0.29 +$0.02 (6.07%) Close

$MREO Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 798.5M shares outstanding

Who owns MREO?

By type of holder

Institutions 7.1% Everyone else 92.9%

No insider has reported a holding in the last two years, so insiders are counted in "Everyone else".

Concentration Top 10 holders own 6.6%

Rubric Capital Management LP 1.9% · EcoR1 Capital, LLC 0.1%

Institutional ownership

7.1%

-2.4 pts vs last qtr

Institutional holders

-4 vs last qtr

Net shares bought

−19.0M

by institutions in Q2 2026

New / sold out

14 / 18

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Two Sigma Investments, LP +1.1M
Ishara Investments LP NEW +768.8K

Biggest sellers in Q2 2026

EcoR1 Capital, LLC −12.4M
Newtyn Management, LLC −4.1M

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Mereo BioPharma Group PLC in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2022–FY2025

+32.1%

+9.74% a year

Each share's claim on the business

−24.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $24.7M

over 4 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years42% 3–5 years27% 1–3 years5% Under 1 year26%

Quarterly turnover

17.5%

of institutional shares changed hands

Top 10 managers, median time held

3 years

Super Investors

Investment managers reporting MREO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
RC Rubric Capital Management LP	15.3M	1.92%	Unchanged	≤2021	0.0%
Shares held by quarter Peak holding15.3M (Q3'24) Change over 8 quarters0 Share of the company1.920% Rubric Capital Management LP's full portfolio →
EC EcoR1 Capital, LLC	1.0M	0.13%	−12.4M (−92.5%)	Q4 '25	0.0%
Shares held by quarter Peak holding13.4M (Q1'26) Change over 8 quarters+1.0M Share of the company0.130% EcoR1 Capital, LLC's full portfolio →

Rubric Capital Management LP

15.3M

% of company

1.92%

Change vs last qtr

Unchanged

Held since

≤2021

EcoR1 Capital, LLC

1.0M

% of company

0.13%

Change vs last qtr

−12.4M (−92.5%)

Held since

Q4 '25

28 more super investors behind a free account

See every manager holding Mereo BioPharma Group PLC, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MREO on Form N-PORT; together they hold 0.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IG iShares Genomics Immunology and Healthcare ETF iShares Trust	$62.4K	232.6K	0.03%	0.04%	April 30, 2026
SS State Street(R) SPDR(R) S&P(R) International Small Cap ETF SPDR Index Shares Funds	$42.8K	134.8K	0.02%	0.00%	June 30, 2026

iShares Genomics Immunology and Healthcare ETF

iShares Trust

Position value

$62.4K

% of company

0.03%

% of the fund

0.04%

As of

April 30, 2026

State Street(R) SPDR(R) S&P(R) International Small Cap ETF

SPDR Index Shares Funds

Position value

$42.8K

% of company

0.02%

% of the fund

0.00%

As of

June 30, 2026

4 more funds behind a free account

See every fund holding Mereo BioPharma Group PLC and how much of the fund the position is.

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