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2026 16:48:00 -0500 MRSN O.12268612 http://www.streetinsider.com/SEC+Filings/Form++4++++++++++Mersana+Therapeutics%2C+++++For%3A+Jan+06++Filed+by%3A+Alleva+Lawrence+M/25814303.html si-local-file:///var/storage/secattach/20260106/25814303.html http://www.streetinsider.com/SEC+Filings/Form++4++++++++++Mersana+Therapeutics%2C+++++For%3A+Jan+06++Filed+by%3A+Alleva+Lawrence+M/25814303.html Tue, 06 Jan 2026 16:48:00 -0500 MRSN O.12268612 http://www.streetinsider.com/SEC+Filings/Form++4++++++++++Mersana+Therapeutics%2C+++++For%3A+Jan+06++Filed+by%3A+Huber+Martin+H.+Jr./25814288.html si-local-file:///var/storage/secattach/20260106/25814288.html http://www.streetinsider.com/SEC+Filings/Form++4++++++++++Mersana+Therapeutics%2C+++++For%3A+Jan+06++Filed+by%3A+Huber+Martin+H.+Jr./25814288.html Tue, 06 Jan 2026 16:47:00 -0500 MRSN O.12268612 http://www.streetinsider.com/SEC+Filings/Form++4++++++++++Mersana+Therapeutics%2C+++++For%3A+Jan+06++Filed+by%3A+Huber+Martin+H.+Jr./25814288.html 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