Skip to main content
Livermore
Livermore
ZHEN

Mereo BioPharma Group plc

MREO
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001719714

No open-market purchases or sales by Mereo BioPharma Group plc insiders were filed in the last 90 days; 60 institutions reported holding it in 13F filings for Q2 2026, worth $18.0M in total; no superinvestor holds it.

Holders of 5% or more of MREO

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mereo BioPharma Group plc, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of MREO
HolderLatest formStakeChangeFirst filedLatest filingFiling
683 Capital Management, LLC13G8.18%65.1M sharesNewJan 6, 20261 filingJan 6, 2026SEC
Adage Capital Partners GP, L.L.C.13G/A5.62%43.6M shares–Feb 5, 20242 filingsFeb 12, 2025SEC
Bank of America Corp13G5.10%41.0M sharesNewMay 14, 20261 filingMay 14, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

72 Schedule 13D and 13G filings on Mereo BioPharma Group plc, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on MREO
Filed (ET)FilerFormStakeChangeEvent dateFiling
Sep 23, 2022Rubric Capital Management LP13D/AOld format–––SEC
Aug 24, 2022Rubric Capital Management LP13D/AOld format–––SEC
Jun 14, 2022Rubric Capital Management LP13D/AOld format–––SEC
Jun 9, 2022Rubric Capital Management LP13D/AOld format–––SEC
May 26, 2022Rubric Capital Management LP13DOld format–––SEC
Feb 15, 2022Rock Springs Capital Management LP13GOld format–New–SEC
Feb 14, 2022Boxer Capital, LLC13G/AOld format–––SEC
Feb 14, 2022Baker Bros. Advisors LP13G/AOld format–––SEC
Feb 14, 2022Rubric Capital Management LP13G/AOld format–––SEC
Feb 14, 2022Citadel Advisors LLC13G/AOld format–––SEC
Feb 14, 2022Point72 Asset Management, L.P.13G/AOld format–––SEC
Feb 11, 2022Vivo Capital IX, LLC13G/AOld format–––SEC
Feb 11, 2022OrbiMed Advisors LLC13G/AOld format–––SEC
Feb 11, 2022Suvretta Capital Management, LLC13G/AOld format–––SEC
Dec 2, 2021Rubric Capital Management LP13GOld format–New–SEC
Mar 1, 2021Point72 Asset Management, L.P.13GOld format–New–SEC
Feb 19, 2021Suvretta Capital Management, LLC13GOld format–New–SEC
Feb 16, 2021Vivo Capital IX, LLC13G/AOld format–––SEC
Feb 16, 2021Boxer Capital, LLC13G/AOld format–––SEC
Feb 16, 2021Baker Bros. Advisors LP13GOld format–New–SEC
Feb 16, 2021Citadel Advisors LLC13G/AOld format–––SEC
Feb 12, 2021OrbiMed Advisors LLC13GOld format–New–SEC

Form 144: proposed insider sales

12 notices from officers, directors and other affiliates planning to sell Mereo BioPharma Group plc shares, newest first.

Form 144 notices for MREO
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Sep 12, 20244:05 PM ETScots-Knight DeniseOfficer · Director88.7K$413.1KSep 12, 2024Morgan Stanley & Co. LLCSEC
Sep 12, 20244:05 PM ETLewicki John A.Officer16.1K$75.3KSep 12, 2024Morgan Stanley & Co. LLCSEC
Sep 12, 20244:05 PM ETAlexandra Hughes-WilsonOfficer148.1K$690.2KSep 12, 2024Morgan Stanley & Co. LLCSEC
Sep 12, 20244:05 PM ETSermon CharlesOfficer30.9K$144.1KSep 12, 2024Morgan Stanley & Co. LLCSEC
Sep 12, 20244:05 PM ETFox Christine AnnOfficer28.3K$131.8KSep 12, 2024Morgan Stanley & Co. LLCSEC
Aug 22, 20246:35 PM ETDeepika PakianathanDirector105.2K$466.2KAug 22, 2024Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Jun 24, 20247:04 PM ETAmendedLewicki John A.Officer26.6K$106.1KJun 25, 2024Morgan Stanley & Co. LLCSEC
Jun 24, 20247:04 PM ETAmendedScots-Knight DeniseOfficer · Director146.3K$582.2KJun 25, 2024Morgan Stanley & Co. LLCSEC
Jun 24, 20247:00 PM ETAmendedAlexandra Hughes-WilsonOfficer33.1K$131.7KJun 25, 2024Morgan Stanley & Co. LLCSEC
Jun 24, 20246:58 PM ETAmendedSermon CharlesOfficer51.0K$203.1KJun 25, 2024Morgan Stanley & Co. LLCSEC
Jun 24, 20246:53 PM ETAmendedFox Christine AnnOfficer46.7K$185.8KJun 25, 2024Morgan Stanley & Co. LLCSEC
May 23, 20246:38 PM ETAlexandra Hughes-WilsonOfficer100.4K$297.5KMay 22, 2024Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC