MREO SCHEDULE 13G/A: SEC filing
EcoR1 Capital, LLC and affiliated entities
Filed with the SEC on · accession 0000935836-26-000413
MREO filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 14, 2026. EcoR1 Capital, LLC and affiliated entities filed a joint filing agreement (Exhibit 99.1) as part of an amended Schedule 13G regarding their holdings in Mereo BioPharma Group plc. The stock moved +3.6% by the first close after the filing.
Summary of the filing
EcoR1 Capital, LLC and affiliated entities filed a joint filing agreement (Exhibit 99.1) as part of an amended Schedule 13G regarding their holdings in Mereo BioPharma Group plc. The agreement designates EcoR1 Capital, LLC as the agent for joint SEC filings under Sections 13(d) and 16(a).
Key details
How MREO stock reacted
Close before
$0.31
Aug 13, 2026
First close after
+3.64%
$0.32
5 trading days
-4.68%
$0.29
Since filing
-8.03%
$0.28
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Click hereFrequently asked questions
What did MREO file with the SEC on Aug 14, 2026?
MREO filed a SCHEDULE 13G/A (SEC filing). EcoR1 Capital, LLC and affiliated entities filed a joint filing agreement (Exhibit 99.1) as part of an amended Schedule 13G regarding their holdings in Mereo BioPharma Group plc. The agreement designates EcoR1 Capital, LLC as the agent for joint SEC filings under Sections 13(d) and 16(a).
How do I read a SCHEDULE 13G/A?
A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.
Why are SEC filings important?
Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).
How did MREO stock react to this filing?
MREO closed at $0.31 before the filing and $0.32 on Aug 14, 2026 (+3.64%). Five trading days later: $0.29 (-4.68%).
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