Mersana Therapeutics Announces Pricing of Public Offering of Common Stock

CAMBRIDGE, Mass., March 01, 2019 (GLOBE NEWSWIRE) -- Mersana Therapeutics, Inc. (Nasdaq:MRSN), a clinical-stage biopharmaceutical company focused on discovering and developing a pipeline of antibody drug conjugates (ADCs) targeting cancers in areas of high unmet need, today announced the pricing of an underwritten public offering of 21,250,000 shares of common stock at a price to the public of $4.00 per share. Gross proceeds to Mersana from the offering are expected to be $85.0 million, before deducting underwriting discounts and commissions and offering expenses payable by Mersana. In addition, Mersana has granted the underwriters a 30-day option to purchase up to an additional 3,187,500 shares of common stock, at the public offering price less underwriting discounts and commissions. All shares are being sold by Mersana. The offering is expected to close on March 5, 2019, subject to the satisfaction of customary closing conditions.

SVB Leerink is acting as sole book-running manager for the offering. Wedbush PacGrow is acting as co-manager for the offering.

Mersana intends to use the net proceeds from the offering to support clinical development of XMT-1536, to progress Mersana’s next ADC product candidates into Phase 1 clinical development, to progress Mersana’s early platform development and the balance to fund working capital, capital expenditures and other general corporate purposes.

The shares of common stock described above are being offered by Mersana pursuant to a shelf registration statement on Form S-3 (File No. 333-226055), which was declared effective by the Securities and Exchange Commission (SEC) on September 17, 2018. A preliminary prospectus supplement relating to and describing the terms of the offering was filed with the SEC on February 28, 2019. The final prospectus supplement relating to the offering will be filed with the SEC. When available, you may obtain copies of the final prospectus supplement and the accompanying prospectus from SVB Leerink LLC, Attention: Syndicate Department, One Federal Street, 37th Floor, Boston, Massachusetts 02110, by telephone at 800-808-7525, ext. 6132 or by email at Electronic copies of the final prospectus supplement and the accompanying prospectus will also be available on the website of the SEC at

This press release does not constitute an offer to sell or a solicitation of an offer to buy the securities in the offering, nor shall there be any sale of these securities in any jurisdiction in which an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such jurisdiction.

About Mersana Therapeutics

Mersana Therapeutics is a clinical-stage biopharmaceutical company using its differentiated and proprietary ADC platforms to develop highly targeted drugs with increased tolerability and expanded opportunities to deliver meaningful clinical benefit to patients.  Mersana’s lead product candidate, XMT-1536, is in a Phase 1 clinical trial in patients with tumors expressing NaPi2b, including ovarian cancer, NSCLC and other cancers. In addition, multiple partners are using Mersana’s platform to advance their ADC pipelines.

Forward-Looking Statements

Certain statements contained in this press release, including those relating to the expected proceeds from the offering, the use of proceeds from the sale of common stock, and the expected closing of the offering, are forward-looking statements that involve a number of risks and uncertainties that could cause actual results to differ materially from those in the forward-looking statements. These risks and uncertainties include, but are not limited to, risks and uncertainties associated with the consummation of the proposed offering and general economic conditions and other risks identified from time to time in the reports we file with the SEC, including our Annual Report on Form 10-K and Quarterly Reports on Form 10-Q, and the preliminary prospectus supplement and accompanying prospectus related to the offering on file with the SEC, which are available at The forward-looking statements in this press release speak only as of the date of this document, and we undertake no obligation to update or revise any of the statements. Our business is subject to substantial risks and uncertainties, including those referenced above. Investors, potential investors, and others should give careful consideration to these risks and uncertainties.


Investor & Media Contact
Sarah Carmody, 617-844-8577