Continued Strong Financial and Operational Performance in the Third Quarter 2021FIRDAPSE® Revenue of $35.9 Million Increased 23.1% Compared to Third Quarter 2020Plans to Seek to Expand the U.S. Approval of FIRDAPSE To Include Pediatric LEMS PatientsStrong Cash Position $174.8 Million Supports Long-term Growth StrategyCompany to Host Quarterly Conference Call on November 10, 2021, at 8:30 AM ET CORAL GABLES, Fla., Nov. 09, 2021 (GLOBE NEWSWIRE) — Catalyst Pharmaceuticals, Inc. (Catalyst) (Nasdaq: CPRX), a commercial-stage, patient-centric biopharmaceutical company focused on in-licensing, developing, and commercializing novel high-quality medicines for patients living with rare diseases, today reported financial results for the third quarter ended September 30, 2021, and provided a corporate update. “We delivered another quarter of strong financial results while making important progress on all fronts,” said Patrick J. McEnany, Chairman and CEO of Catalyst. “We reported a record quarter for net sales for FIRDAPSE®, further underscoring the strength of our commercial capabilities while advancing our efforts in support of the orphan drug exclusivity of FIRDAPSE for the treatment of LEMS. We continued to execute on all key growth initiatives, including plans to expand the label for FIRDAPSE to include all LEMS patients, including the very few pediatric patients diagnosed with LEMS. Our quarterly achievements demonstrate continued performance excellence supported by several key strategic decisions that have positioned Catalyst firmly for the future. In saying that, we are excited about the path ahead as we continue to execute across all fronts to drive sustainable growth for the long term. ” Operational Highlights Achieved record net FIRDAPSE revenue in the third quarter of 2021 of $35.9 million driven by strong patient persistency and new patient enrollments, representing a 6.7% increase compared to the second quarter 2021.Received favorable decision from the U.S. 11th Circuit Court of Appeals supporting the orphan drug exclusivity for FIRDAPSE® (amifampridine) Tablets 10 mg for LEMS treatment in the U.S.Strengthened the intellectual property portfolio for FIRDAPSE with a second patent published in the Orange Book, extending the intellectual property to 2034, with additional patents pending.Advancing global expansion initiative with partner DyDo Pharma to initiate a small registrational trial for the development of FIRDAPSE® (amifampridine) Tablets 10 mg for the treatment of Lambert-Eaton myasthenic syndrome in Japan in early 2022.Work continues on our long-acting candidate formulation of amifampridine phosphate for the treatment of LEMS.Plans underway to file a supplemental NDA for FIRDAPSE for the treatment of pediatric LEMS.After much evaluation, we are ending the development program for Musk-MG but will continue to support patients currently receiving FIRDAPSE to treat their MuSK-MG symptoms through investigator-initiated programs, in accordance with FDA regulations.Strong cash position increases scope of business development initiatives to expand the focus beyond FIRDAPSE through acquisition or in-licensing of products or companies.The Company repurchased 949,746 million shares during the third quarter 2021 under its share buyback program, at an average price of $5.32 per share, bringing the total shares purchased through September 30, 2021 to 1,749,746 shares, at an average price of $5.15 per share. Third Quarter 2021 Financial Results Total Net FIRDAPSE Revenue in the third quarter of 2021 was $35.9 million, a 23.1% increase compared to $29.2 million for the third quarter of 2020. Total Operating Income in the third quarter of 2021 was $14.0 million, compared to $11.7 million in the third quarter of 2020. Research and Development Expenses in the third quarter of 2021 were $4.5 million, compared to $3.7 million in the third quarter of 2020. Selling, General, and Administrative Expenses for the third quarter of 2021 were $12.2 million, compared to $10.0 million for the third quarter of 2020. Cash and Investments were approximately $174.8 million as of September 30, 2021, approximately $20 million increase when compared to $155.3 million as of June 30, 2021, with no funded debt in either period.GAAP Net Income for the third quarter of 2021 was $10.3 million ($0.10 per basic and diluted share), compared to $43.3 million ($0.42 per basic and $0.41 per diluted share) for the third quarter of 2020. Net income for the nine months ended September 30, 2021 was $30.2 million ($0.29 per basic and $0.28 per diluted share), compared to $63.5 million ($0.61 per basic and $0.60 per diluted share) for the comparable nine month period. Net income for the third quarter of 2020 benefitted from the one-time recording of an approximately $31.6 million deferred tax asset, upon reversal of a valuation allowance. Non-GAAP Financial Measures Non-GAAP1 net income for Q3-21 was $15.6 million ($0.15 per basic and $0.14 per diluted share), which excludes from GAAP net income of $10.3 million (i) stock-based compensation expense of $1.5 million, (ii) depreciation of $31 thousand, and (iii) the provision for income taxes of $3.7 million. This compares to non-GAAP1 net income for Q3-20 of $13.2 million ($0.13 per basic and $0.12 per diluted share), which excludes from GAAP net income of $43.3 million (i) stock-based compensation expense of $1.5 million, (ii) depreciation of $30 thousand, and (iii) a benefit for income taxes of $31.6 million, as the Company recorded the deferred tax asset during Q3-20. A tabular presentation of non-GAAP1 net income for the three months and nine months ended September 30, 2021 and 2020 is included below._________________________ 1 Statements made in this press release include non-GAAP financial measures. Such information is provided as additional information and not as an alternative to Catalyst’s financial statements presented in accordance with the U.S. generally accepted accounting principles (GAAP). These non-GAAP financial measures are intended to enhance an overall understanding of Catalyst’s current financial performance. Catalyst believes that the non-GAAP financial measures presented in this press release provide investors and prospective investors with an alternative method for assessing Catalyst’s operating results in a manner that Catalyst believes is focused on the performance of ongoing operations and provides a more consistent basis for comparison between periods. Non-GAAP financial measures should not be considered in isolation or as a substitute for comparable GAAP accounting. Further, non-GAAP measures of net income used by Catalyst may be different from and not directly comparable to similarly titled measures used by other companies. The non-GAAP financial measures in this press release exclude from the calculation of net income (i) the expense associated with non-cash stock-based compensation, (ii) depreciation expense, and (iii) the (benefit) provision for income taxes. Non-GAAP income per share is calculated by dividing non-GAAP income by the weighted average common shares outstanding. More detailed financial information and analysis can be found in the Company’s Quarterly Report on Form 10-Q, which was filed with the Securities and Exchange Commission (SEC) on November 9, 2021. Conference Call Catalyst management will host a conference call and webcast on Wednesday, November 10, 2021, at 8:30 AM ET to discuss the financial results and provide a corporate update. To access the call, please dial 877-407-8912 for the United States and Canada or 201-689-8059 for International. A webcast of the call will be available on the Investors section of the Company’s website at www.catalystpharma.com. A webcast replay will be available on the Catalyst website for 30 days following the call by visiting the Investor page of the Company’s website at www.catalystpharma.com. About Catalyst Pharmaceuticals Catalyst Pharmaceuticals is a commercial-stage, patient-centric biopharmaceutical company focused on in-licensing, developing, and commercializing novel high-quality medicines for patients living with rare diseases. With exceptional patient focus, Catalyst is committed to developing a robust pipeline of cutting-edge, first- or best-in-class medicines for rare diseases. Catalyst’s New Drug Application for FIRDAPSE® (amifampridine) Tablets 10 mg for the treatment of adults with LEMS was approved in 2018 by the U.S. Food & Drug Administration (“FDA”), and FIRDAPSE is commercially available in the United States as a treatment for adults with LEMS. Further, Canada’s national healthcare regulatory agency, Health Canada, approved the use of FIRDAPSE (amifampridine) for the treatment of adult patients in Canada with LEMS. Forward-Looking Statements This press release contains forward-looking statements. Forward-looking statements involve known and unknown risks and uncertainties, which may cause Catalyst’s actual results in future periods to differ materially from forecasted results. A number of factors, including (i) the continuing effect of the COVID-19 pandemic on Catalyst’s net product revenues and net income, (ii) Catalyst’s ability to locate and acquire new product candidates through acquisition or in-licensing, (iii) Catalyst’s ability to successfully develop any new product candidates acquired or in-licensed, (iv) Catalyst’s ability to successfully develop and commercialize a long-acting formulation of FIRDAPSE, and (v) those factors described in Catalyst’s Annual Report on Form 10-K for the fiscal year 2020 and Catalyst’s other filings with the U.S. Securities and Exchange Commission (SEC), could adversely affect Catalyst. Copies of Catalyst’s filings with the SEC are available from the SEC, may be found on Catalyst’s website, or may be obtained upon request from Catalyst. Catalyst does not undertake any obligation to update the information contained herein, which speaks only as of this date. CATALYST PHARMACEUTICALS, INC.CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (in thousands, except share data) For the Three MonthsEnded September 30, For the Nine MonthsEnded September 30, 2021 2020 2021 2020 Product revenue, net$35,890 $29,167 $99,731 $87,908 License and other revenue 64 150 2,793 150 Total revenues 35,954 29,317 102,524 88,058 Operating costs and expenses: Cost of sales 5,310 3,879 14,536 12,170 Research and development 4,487 3,749 11,944 12,322 Selling, general and administrative 12,153 9,985 36,401 30,881 Total operating costs and expenses 21,950 17,613 62,881 55,373 Operating income 14,004 11,704 39,643 32,685 Other income, net 68 33 211 481 Net income before income taxes 14,072 11,737 39,854 33,166 Income tax provision (benefit) 3,743 (31,603) 9,681 (30,380)Net income$10,329 $43,340 $30,173 $63,546 Net income per share: Basic$0.10 $0.42 $0.29 $0.61 Diluted$0.10 $0.41 $0.28 $0.60 Weighted average shares outstanding: Basic 103,196,550 103,535,431 103,470,762 103,452,025 Diluted 107,843,196 106,316,241 107,476,175 106,386,617 CATALYST PHARMACEUTICALS, INC.RECONCILIATION OF NON-GAAP METRICS (unaudited) (in thousands, except share data) For the Three MonthsEnded September 30, For the Nine MonthsEnded September 30, 2021 2020 2021 2020 GAAP net income$10,329 $43,340 $30,173 $63,546 Non-GAAP adjustments: Stock-based compensation expense 1,512 1,478 4,601 4,792 Depreciation 31 30 159 73 Income tax provision (benefit) 3,743 (31,603) 9,681 (30,380)Non-GAAP net income$15,615 $13,245 $44,614 $38,031 Non-GAAP net income per share: Basic$0.15 $0.13 $0.43 $0.37 Diluted$0.14 $0.12 $0.42 $0.36 Weighted average shares outstanding – basic 103,196,550 103,535,431 103,470,762 103,452,025 Weighted average shares outstanding – diluted.. 107,843,196 106,316,241 107,476,175 106,386,617 CATALYST PHARMACEUTICALS, INC.CONDENSED CONSOLIDATED BALANCE SHEETS (in thousands) September 30, 2021 December 31, 2020 (unaudited) ASSETS Current Assets: Cash and cash equivalents$154,836 $130,237 Short-term investments 19,956 10,041 Accounts receivable, net 6,625 5,987 Inventory 6,950 4,651 Prepaid expenses and other current assets 4,428 8,328 Total current assets 192,795 159,244 Operating lease right-of-use asset 3,093 — Property and equipment, net 951 130 Deferred tax assets 26,400 32,971 Deposits 9 9 Total assets$223,248 $192,354 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities: Accounts payable$2,752 $4,256 Accrued expenses and other liabilities 17,862 18,500 Total current liabilities 20,614 22,756 Operating lease liability, net of current portion 3,973 — Total liabilities 24,587 22,756 Total stockholders’ equity 198,661 169,598 Total liabilities and stockholders’ equity$223,248 $192,354 Media ContactDavid SchullRusso Partners(858) 717-2310david.schull@russopartnersllc.com Investor ContactMary ColemanCatalyst Pharmaceuticals, Inc.(305) 420-3200mcoleman@catalystpharma.com