Company: DAWN
Filing Date: 2025-11-13
Form Type: SC TO-C
Source: 0001104659-25-110815
Chunk: 16

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-11-13
Form: SC TO-C
Chunk 16
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 THEY MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME, WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION THAT INVESTORS AND SECURITY HOLDERS SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING TENDERING THEIR COMMON STOCK, INCLUDING THE TERMS AND CONDITIONS OF THE TENDER OFFER. Investors and security holders may obtain a free copy of these statements (when available) and other documents filed with the SEC at Day One’s website at ir.dayonebio.com and (once they become available) will be mailed to the stockholders of Mersana free of charge. The information contained in, or that can be accessed through, Day One’s website is not a part of, or incorporated by reference in, this filing. The tender offer materials (including the Offer to Purchase and the related Letter of Transmittal), as well as the Solicitation/Recommendation Statement, will also be made available for free on the SEC’s website at www.sec.gov. In addition to the Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents, as well as the Solicitation/Recommendation Statement, Day One and Mersana file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read any reports, statements or other information filed by Mersana and Day One with the SEC for free on the SEC’s website at

Cautionary Note Regarding Forward-Looking Statements

This communication contains forward-looking statements. Forward-looking
statements are generally identified by the words “expects”, “anticipates”, “believes”, “intends”,
“estimates”, “plans”, “will”, “goal” and similar expressions. These forward-looking statements
include, without limitation, statements related to the anticipated consummation of the acquisition of Mersana and the expected benefits
therefrom; and other statements that are not historical facts. These forward-looking statements are based on Day One’s current expectations
and inherently involve significant risks and uncertainties. Actual results and the timing of events could differ materially from those
anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, without limitation, risks
related to Day One’s ability to complete the transaction on the proposed terms and schedule, or at all; whether the various conditions
to the consummation of the transaction under the merger agreement will be satisfied or waived; whether stockholders of Mersana tender
sufficient shares in the transaction; the occurrence of any event