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General and administrative (G&A) expenses for the three and twelve months ended December 31, 2021 were $25.9 million and $92.7 million, respectively, as compared to $72.0 million and $80.7 million in the same prior year periods. The year-over-year full year increase of $12.0 million was attributable to an increase of $25.3 million in G&A personnel cost and professional consulting fees, and $9.7 million of other G&A costs related to supporting platform growth and public company requirements. These increases were partially offset by a decrease of $22.9 million in stock-based compensation expense.
Total stock-based compensation expense for the three and twelve months ended December 31, 2021 was $13.4 million and $63.4 million, respectively, as compared to $67.2 million for the fourth quarter and prior year periods, reflecting the recognition of expense in 2021 related to the achievement of IPO performance-based partial vesting conditions and the issuance of convertible notes in 2020.
Net loss attributable to shareholders for the three and twelve months ended December 31, 2021 was $88.9 million and $167.8 million, respectively, as compared to $86.6 million and $169.8 million for the comparable prior year periods.
About atai Life Sciences
atai Life Sciences is a clinical-stage biopharmaceutical company aiming to transform the treatment of mental health disorders. Founded in 2018 as a response to the significant unmet need and lack of innovation in the mental health treatment landscape, atai is dedicated to acquiring, incubating, and efficiently developing innovative therapeutics to treat depression, anxiety, addiction, and other mental health disorders.
atai’s business model combines funding, technology, scientific, and regulatory expertise with a focus on innovative compounds, including psychedelic therapy and other drugs with differentiated safety profiles and therapeutic potential. By pooling resources and best practices, atai aims to responsibly accelerate the development of new medicines across its companies to achieve clinically meaningful and sustained behavioral change in mental health patients.
atai’s vision is to heal mental health disorders so that everyone, everywhere can live a more fulfilled life. atai has offices in New York, San Diego, Boston, London and Berlin. For more information, please visit www.atai.life.
Forward-Looking Statements
This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “anticipate,” “initiate,” “could,” “would,” “project,” “plan,” “potentially,” “preliminary,” “likely,” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these words. All statements contained in this press