Operating Expenses
Total operating expenses for the fourth quarter of 2019 were $130.0 million compared with $106.6 million for the same period in 2018, including non-cash stock-based compensation of $19.7 million and $21.1 million in the fourth quarter of 2019 and 2018, respectively. Total operating expenses for the year ended December 31, 2019, were $527.9 million, which includes $15.6 million in expenditures for Arcturus collaboration and license amendment and $20 million for the upfront payment on the GeneTx agreement, compared with operating expenses of $422.9 million for the same period in 2018. The operating expenses include non-cash stock-based compensation of $82.0 million and $80.1 million in the full year of 2019 and 2018, respectively. The increase in total operating expenses is due to the increase in commercial, development, and general and administrative costs as the company commercializes, grows, and advances its pipeline.

For the fourth quarter of 2019, Ultragenyx reported a net loss of $93.8 million, or $1.62 per share, basic and diluted, compared with a net loss for the fourth quarter of 2018 of $87.8 million, or $1.73 per share, basic and diluted. For the year ended December 31, 2019, the net loss was $402.7 million, or $7.12 per share, basic and diluted, compared with a net loss for the same period in 2018 of $197.6 million, or $3.97 per share, basic and diluted. The loss for the fourth quarter of 2019 and for the year ended December 31, 2019 includes unrealized gains of $1.4 million and $13.4 million, respectively, from the fair value adjustments on the investment in Arcturus equity securities. The loss from the full year 2018 was reduced by the gain on the sale of the Mepsevii priority review voucher (PRV) in January 2018 for net proceeds of $130.0 million and a $40.3 million gain from Ultragenyx's portion of the sales of the PRV received with the Crysvita approval. The net loss for the full year 2019 reflected cash used in operations of $345.4 million compared to $290.6 million for the same period in 2018.

Crysvita Guidance in Ultragenyx Territories
In 2020, the company continues to expect Crysvita revenue in the Ultragenyx territories to be between $125 million and $140 million, which excludes the European territory revenue. Ultragenyx territories include the collaboration revenue from the North American profit share territory (US and Canada) and other regions where revenue from product sales are recognized by Ultragenyx (Latin America, Turkey). In December 2019, the European territory royalty revenue rights were sold to Royalty Pharma. As a result, the company will no longer receive cash payments from the EU territory royalty revenue rights beginning January 1, 2020, until the respective threshold amount is met; however, the company will continue to record the royalty as "non-cash" revenue.

• Recent positive data from Cohort 3 indicated two confirmed responders and a potential third responder out of three total patients, as well as a new responder in Cohort 2. There are currently up to six responders of the nine dosed to date with a more consistent response at higher doses.
• Ultragenyx is initiating a fourth cohort (n=3) using prophylactic steroids at the same dose as Cohort 3. Data from the prophylactic steroid cohort are expected in the second half of 2020.

• An investigational new drug (IND) application is now active and GeneTx has received Institutional Review Board (IRB) approval from the first study site. Enrollment in the Phase 1/2 study of GTX-102 is expected to begin in the first half of 2020.
• In February 2020, Ultragenyx paid $25 million after the acceptance of the IND to maintain its option to acquire GeneTx until the earlier of 30 months from the first dosing of a patient in the Phase 1/2 study (subject to extensions) or 90 days after results are available from that study.

• Three cohorts with two patients each, six patients in total, have been dosed with AAVhu37 (DTX201 / BAY 2599023), using material from Ultragenyx's proprietary HeLa manufacturing platform. Longer term dose cohort 1 and new dose cohort 2 data presented at EAHAD showed three of four patients have achieved clinically meaningful FVIII levels. One patient in Cohort 1 has achieved clinically meaningful FVIII levels and has experienced four bleeds since receiving treatment down from 99 bleeds the prior year. Both patients in dose cohort 2 achieved clinically meaningful FVIII levels out to 24 and 30 weeks. Patient 4 has been off treatment and bleed free for seven months as of the data cut-off date. The second patient in dose cohort 2 had mild ALT/AST elevations that was managed with a short tapering course of corticosteroids.

Ultragenyx will host a conference call today, Thursday, February 13, 2020, at 2 p.m. PT/ 5 p.m. ET to discuss fourth quarter and full year 2019 financial results and provide a corporate update. The live and replayed webcast of the call will be available through the company's website at http://ir.ultragenyx.com/events.cfm. To participate in the live call by phone, dial (855) 797-6910 (USA) or (262) 912-6260 (international) and enter the passcode 5068548. The replay of the call will be available for one year.

Except for the historical information contained herein, the matters set forth in this press release, including statements related to Ultragenyx's expectations and projections regarding its future operating results and financial performance, anticipated cost or expense reductions, the timing, progress and plans for its clinical programs and clinical studies, future regulatory interactions, and the components and timing of regulatory submissions are forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve substantial risks and uncertainties that could cause our clinical development programs, collaboration with third parties, future results, performance or achievements to differ significantly from those expressed or implied by the forward-looking statements. Such risks and uncertainties include, among others, Ultragenyx's reliance on its third party partner, Kyowa Kirin Co. ,Ltd., for the supply of Crysvita, smaller than anticipated market opportunities for the company's products and product candidates, the company's evolving commercial infrastructure, uncertainties related to insurance coverage and reimbursement approval for the company's products, manufacturing risks, the uncertainties inherent in the clinical drug development process, including the potential for substantial delays and the risk that earlier study results may not be predictive of future study results, the lack of predictability in the regulatory approval process, the timing of regulatory filings and approvals (including whether such approvals can be obtained), and other matters that could affect sufficiency of existing cash, cash equivalents and short-term investments to fund operations, the company's future operating results and financial performance and the availability or commercial potential of Ultragenyx's products and drug candidates. Ultragenyx undertakes no obligation to update or revise any forward-looking statements. For a further description of the risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to the business of Ultragenyx in general, see Ultragenyx's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2019, and its subsequent periodic reports filed with the Securities and Exchange Commission.