Aldeyra Therapeutics, Inc. (Nasdaq: ALDX) (Aldeyra), a clinical-stage biotechnology company devoted to treating inflammation, inborn errors of metabolism, and other diseases related to endogenous aldehyde toxicity, today announced that it intends to offer and sell, subject to market and other conditions, shares of its common stock in an underwritten public offering. Aldeyra also expects to grant the underwriters a 30-day option to purchase up to an additional 15% of the shares of common stock offered in the offering, at the public offering price, less the underwriting discounts and commissions. There can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering. All of the shares in the offering are to be sold by Aldeyra, with net proceeds to be used for the continued development of Aldeyra's lead compound ADX-102 and other product candidates, as well as for debt maintenance, working capital and other general corporate purposes.

Cantor Fitzgerald & Co. is acting as the sole book-running manager for the offering. Laidlaw & Company (UK) Ltd. is acting as the lead manager for the offering.

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 as topical eye drops for the treatment of ocular inflammation. ADX-102 has now been tested in over 250 patients in Phase 2 clinical trials in dry eye disease, allergic conjunctivitis, and noninfectious anterior uveitis. A dermatologic form of ADX-102 is in late-stage clinical development for the treatment of ichthyosis due to Sjögren-Larsson Syndrome, an inborn error of aldehyde metabolism. ADX-102 has not been approved for sale in the U.S. or elsewhere.