Windtree Therapeutics Reports Second Quarter 2016 Financial Results and Provides Key Business Updates WARRINGTON, PA

Windtree Therapeutics Reports Second Quarter 2016 Financial Results and Provides Key Business Updates

WARRINGTON, PA - August 10, 2016 - Windtree Therapeutics, Inc. (Nasdaq: WINT), a biotechnology company focused on developing aerosolized KL4 surfactant therapies for respiratory diseases, today reported financial results for the second quarter ended June 30, 2016 and provided key business updates.

Key Business and Financial Updates

"The second quarter of 2016 was one of meaningful progress for Windtree and our AEROSURF phase 2 program," commented Craig Fraser, President and Chief Executive Officer. "We expanded our clinical trial to include sites in Europe and Latin America, conducted a successful meeting with the FDA that will guide our AEROSURF development program, completed collection and analysis of data from over 2,000 premature infants in the Noninterventional Observational Study, and completed the Lung Deposition Study in non-human primates. Our primary objective for 2016 remains the rigorous and timely execution of the AEROSURF phase 2 program while effectively managing existing cash resources."

Select Financial Results for the Second Quarter ended June 30, 2016

For the quarter ended June 30, 2016, the Company reported an operating loss of $10.0 million, compared to $10.4 million for the second quarter of 2015.

Grant revenue for the second quarter of 2016 and 2015 was $0.1 million. Grant revenue represents funds received and expended under SBIR grants from the NIH to (i) in both 2015 and 2016, study the Company's aerosolized KL4 surfactant as a medical countermeasure to mitigate acute and chronic/late-phase radiation-induced lung injury; and, (ii) in 2015, provide support for the initial AEROSURF phase 2a clinical trial in premature infants 29 to 34 week gestational age with RDS.

Research and development expenses were $8.3 million for the second quarter of 2016, compared to $7.1 million for the second quarter of 2015. The increase was due to a $2.6 million increase in AEROSURF clinical trial activities, including patient enrollment costs, ongoing clinical site initiations and the manufacture of additional clinic-ready aerosol delivery systems (ADS), partially offset by a decrease of $1.3 million in manufacturing costs following the closure of our manufacturing operations at our leased facility in Totowa, NJ in June 2015.

Selling, general and administrative expenses for the second quarter of 2016 were $1.8 million, compared to $3.4 million for the second quarter of 2015. The decrease was primarily due to the Company's decision in April 2015 to voluntarily cease commercial and manufacturing activities for SURFAXIN , resulting in a reduction in workforce related primarily to commercial infrastructure.

Interest expense for the second quarter of 2016 was $0.6 million, compared to $1.3 million for the second quarter of 2015. The decrease in interest expense was due to the July 2015 restructuring of our long-term debt with affiliates of Deerfield Management Company, L.P., which resulted in the write-off of previously capitalized debt discount costs which were being amortized to interest expense.

The Company reported a net loss of $10.6 million ($1.29 per basic share) on 8.2 million weighted-average common shares outstanding for the quarter ended June 30, 2016, compared to a net loss of $11.3 million ($1.82 per basic share) on 6.1 million weighted average common shares outstanding for the comparable period in 2015.

Net cash outflows before financing activities for the second quarter of 2016 were $9.1 million.

As of June 30, 2016, the Company had cash and cash equivalents of $20.3 million. Based on current projections and development timelines, the Company anticipates that it has sufficient cash to support its operations through the planned completion of the AEROSURF phase 2b clinical trial and the release of top line results, which is expected in the first quarter of 2017. In addition, as of June 30, 2016, the Company reported accounts payable and accrued expenses of $15.1 million, including $4.5 million due under the collaboration agreement with the Battelle Memorial Institute, and long-term debt with Deerfield of $25 million. The debt is payable in two equal installments of $12.5 million in each of February 2018 and 2019. The payment due in February 2018 may be deferred if certain conditions are satisfied.

Readers are referred to, and encouraged to read in its entirety, the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, which is expected to be filed today with the Securities and Exchange Commission, and includes discussion about the Company's business plans and operations, financial condition, and results of operations.

The Company plans on updating investors in September and providing a comprehensive update on the AEROSURF development program including the ongoing AEROSURF phase 2a and 2b clinical trials in premature infants, the Lung Deposition Study in nonhuman primates, and other business updates.

Windtree's lead product candidate is AEROSURF, a novel, investigational drug/device product that combines the Company's proprietary KL4 surfactant and aerosolization technologies. AEROSURF is being developed to potentially reduce or eliminate the need for endotracheal intubation and mechanical ventilation in the treatment of premature infants with respiratory distress syndrome (RDS). Enrollment is ongoing in a phase 2b clinical trial in up to 240 premature infants to study AEROSURF in premature infants 26 to 32-week gestational age receiving nasal continuous positive airway pressure (nCPAP) for RDS, compared to infants receiving nCPAP alone. The phase 2b trial is a global trial with clinical sites in North America, Europe and Latin America.

About Windtree Therapeutics

Windtree Therapeutics, Inc. is a clinical-stage biotechnology company focused on developing novel surfactant therapies for respiratory diseases and other potential applications. Windtree's proprietary technology platform includes a synthetic, peptide-containing surfactant (KL4 surfactant) that is structurally similar to endogenous pulmonary surfactant and novel drug-delivery technologies being developed to enable noninvasive administration of aerosolized KL4 surfactant. Windtree is focused initially on improving the management of respiratory distress syndrome (RDS) in premature infants and believes that its proprietary technology may make it possible, over time, to develop a pipeline of KL4 surfactant product candidates to address a variety of respiratory diseases for which there are few or no approved therapies.

For more information, please visit the Company's website at www.windtreetx.com.

Forward-Looking Statements

To the extent that statements in this press release are not strictly historical, all such statements are forward-looking, and are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results, including projections of future cash balances and anticipated cash outflows, to differ materially from the statements made. Examples of such risks and uncertainties include: risks related to Windtree's AEROSURF development program and other development programs that we may undertake in the future, which may involve time-consuming and expensive pre-clinical studies and clinical trials and which may be subject to potentially significant delays or regulatory holds, or fail; risks that Windtree will be unable to secure significant additional capital as needed, and may be unable in a timely manner, if at all, to identify potential strategic transactions (including strategic partnerships and other transactions) that would provide funding and support product development, regulatory and, if approved, commercialize our products, or to access debt or equity financings, which could result in substantial equity dilution; risks related to the Company's receipt of a deficiency notification from The NASDAQ Stock Market concerning its failure to comply with The Nasdaq Capital Market listing requirements and the Company's ability to regain compliance in a timely manner, if at all; risks related to technology transfers to contract manufacturers and problems or delays encountered by Windtree, contract manufacturers or suppliers in manufacturing drug products, drug substances, aerosol delivery systems (ADS) and other materials on a timely basis and in sufficient amounts; risks relating to rigorous regulatory requirements, including that: (i) the FDA or other regulatory authorities may not agree with Windtree on matters raised during regulatory reviews, may require significant additional activities, or may not accept or may withhold or delay consideration of applications, or may not approve or may limit approval of Windtree's products, and (ii) changes in the national or international political and regulatory environment may make it more difficult to gain regulatory approvals; risks related to Windtree's efforts to maintain and protect the patents and licenses related to its products; and other risks and uncertainties described in Windtree's filings with the Securities and Exchange Commission including the most recent reports on Forms 10-K, 10-Q and 8-K, and any amendments thereto.

Contact Information:

Senior Vice President and Chief Financial Officer

215.488.9418 or jtattory@windtreetx.com

Note: All share and per share amounts related to common stock have been adjusted to reflect the 1-for-14 reverse stock split made effective on January 22, 2016.