In April 2017, the Company entered into a license agreement, or the PARI License Agreement, with PARI Pharma GmbH, or PARI. Pursuant to the PARI License Agreement, PARI granted the Company an exclusive, sublicensable license to use its nebulizer devices for the development and commercialization of certain inhalant drug products as outlined in the PARI License Agreement. PARI additionally granted the Company a non-exclusive, sublicensable license to use certain proprietary accessories owned or controlled by PARI with the nebulizer devices for development of the drug products, as well as a non-sublicensable, exclusive sublicense to use certain Novartis patent rights which PARI licensed from Novartis for use with the nebulizer devices. PARI also granted the Company certain options to expand the licenses granted which would separately require amendments to the PARI License Agreement.

As consideration for the PARI License Agreement, the Company paid a non-refundable up-front initial payment of 400 thousand EUR ($0.4 million). In addition, the Company agreed to make payments upon the achievement of certain developmental and regulatory milestones as it relates to its Drug Product, including initiation of Phase 2 and Phase 3 clinical trials, acceptance for filing by either the FDA or the European Medicines Agency, or the EMA, and approval by either the FDA or the EMA. Upon the achievement of these development and regulatory milestones, the Company is required to make payments up to, in aggregate, a low-mid single‑digit million‑euro amount for products using the device. The Company is additionally required to pay a mid six‑figure‑euro amount in the event that the Company consolidates or merges in a transaction in which 50% of the voting power of the Company is sold. After approval occurs, the Company is also required to pay PARI royalties equal to mid-single-digit percentage of net sales over a certain period. Further, following the first year of commercial sales in a major market, the Company shall pay a minimum annual royalty equal to a mid-single-digit percentage through the end of the relevant royalty term. Through March 31, 2026, the Company has met one developmental milestone, for which the payment was expensed to research and development when incurred. There were no regulatory milestones achieved during the three months ended March 31, 2026 and 2025.