Aldeyra Therapeutics, Inc. Announces Closing of Public Offering of Common Stock and Full Exercise of Underwriters' Option to Purchase Additional Shares

February 17, 2017

LEXINGTON, MA -- (Marketwired) -- 02/17/17 -- Aldeyra Therapeutics, Inc. (NASDAQ: ALDX) (Aldeyra), a biotechnology company focused on the development of products to treat diseases related to aldehydes, today announced the closing of its previously announced underwritten public offering. Aldeyra sold 2,555,555 shares of its common stock, including 333,333 shares sold in connection with the exercise in full by the underwriters of their option to purchase additional shares. The net proceeds of the offering, including the full exercise of the option, were approximately $10.5 million, after deducting the underwriting discounts and commissions and the other estimated offering expenses payable by Aldeyra.

Stifel and Canaccord Genuity acted as joint book-running managers and Laidlaw & Company (UK) Ltd. acted as the lead manager for the offering.

A shelf registration statement on Form S-3 relating to the public offering of the shares of common stock described above was filed with the Securities and Exchange Commission (SEC) and declared effective by the SEC on September 1, 2015. A final prospectus supplement and accompanying prospectus relating to and describing the terms of the offering was filed with the SEC on February 14, 2017 and is available on the SEC's web site at www.sec.gov. Copies of the final prospectus supplement and accompanying prospectus relating to these securities may also be obtained by sending a request to: Stifel, Nicolaus & Company, Incorporated, Attention: Syndicate, One Montgomery Street, Suite 3700, San Francisco, California 94104, by calling (415) 364-2500, or by email at syndprospectus@stifel.com; or by contacting Canaccord Genuity Inc., Attention: Syndicate Department, 99 High Street, 12th Floor, Boston, Massachusetts 02110, by telephone at (617) 371-3900, or by email at prospectus@canaccordgenuity.com.

About Aldeyra Therapeutics, Inc.

Aldeyra Therapeutics, Inc. is a biotechnology company devoted to improving lives by inventing, developing and commercializing products that treat diseases thought to be related to endogenous aldehydes, a naturally occurring class of pro-inflammatory and toxic molecules. Aldeyra's lead product candidate, ADX-102, is an aldehyde trap in development for ocular inflammation, as well as for Sjögren-Larsson Syndrome and Succinic Semi-Aldehyde Dehydrogenase Deficiency, two inborn errors of aldehyde metabolism. Aldeyra's product candidates have not been approved for sale in the U.S. or elsewhere.

CONTACT:

Corporate Contact:
Stephen Tulipano
Aldeyra Therapeutics, Inc.
Tel: +1 781-761-4904 Ext. 205
Email Contact

Investor Contact:
Chris Brinzey
Westwicke Partners
Tel: +1 339-970-2843
Email Contact

Media Contact:
Cammy Duong
MacDougall Biomedical Communications
Tel: +1 781-591-3443
Email Contact

Source: Aldeyra Therapeutics

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Safe Harbor Disclosure

This video content contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding Aldeyra’s possible or assumed future results of operations, expenses and financing needs, business strategies and plans, research and development plans or expectations, trends, the structure, timing and success of Aldeyra’s planned or pending clinical trials, expected milestones, market sizing, pricing and reimbursement, competitive position, regulatory matters, industry environment and potential growth opportunities, among other things. Actual results or trends could differ materially from those contemplated by these forward-looking statements. For more information, please refer to the risk factors discussed in Aldeyra's periodic filings with the SEC, including the most recent Form 10-Q or 10-K. Any forward-looking statements that are made in the video content are based on assumptions as of the original date of the creation of such video, and Aldeyra undertakes no obligation to update these statements as a result of new information or future events.

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