Stockholm, Sweden

Calliditas Therapeutics

announces license agreement with Viatris to register and commercialize specialty therapy for IgA nephropathy in Japan

Calliditas announces

that it has entered into an agreement with Viatris to bring Nefecon , a specialty therapy focused on downregulating IgA1,

to Japanese patients. The agreement, worth up to $100M in upfront and milestone payments, combines Calliditas' specifically formulated

drug candidate with Viatris' development, marketing and sales expertise.

December 13, 2022 - Calliditas Therapeutics AB (Nasdaq: CALT, Nasdaq Stockholm: CALTX) ("Calliditas") announced today

that they have entered into an exclusive license agreement with Viatris Pharmaceuticals Japan Inc., a subsidiary of Viatris Inc. (Nasdaq:

VTRS) ("Viatris"), to register and commercialize Nefecon, a specialty drug recently approved in Europe and the US for the

treatment of the chronic autoimmune kidney disease Immunoglobulin A Nephropathy (IgAN) in Japan.

of the agreement, Calliditas is entitled receive an initial upfront payment of US$20M upon signing and up to an additional US$80M in

pre-defined development and commercialization milestones. Viatris will also pay mid-teens percentage royalties on net sales.

as Berger s disease, is a rare and serious progressive autoimmune disease in which up to 50% of patients end up at risk of developing

end stage renal disease and thus requiring dialysis or a kidney transplant.

to be entering into this license agreement with Viatris, through its Global Healthcare Gateway , to bring this IgAN therapy

to patients in Japan, where there is a significant unmet medical need. We look forward to working in close collaboration to pursue a

Japanese marketing authorization with the goal of bringing the first ever medication designed specifically to target the origin of the

disease to Japanese IgAN patients as soon as possible," said Ren e Aguiar-Lucander, CEO of Calliditas.

as transaction advisor to Calliditas.

information, please contact:

12 98 45, email: marie.galay@calliditas.com

in the press release is information that Calliditas is obliged to make public pursuant to the EU Market Abuse Regulation. The information

was sent for publication, through the agency of the Calliditas contact person set out above, on December 13, 2022 at 8:00 a.m. CET.

Calliditas Therapeutics

is a commercial stage biopharma company based in Stockholm, Sweden focused on identifying, developing and commercializing novel treatments

in orphan indications, with an initial focus on renal and hepatic diseases with significant unmet medical needs. Calliditas' lead

product, Nefecon, has been granted accelerated approval by the FDA under the trade name TARPEYO and conditional

marketing authorization by the European Commission under the trade name Kinpeygo . Kinpeygo is being commercialized in

the European Union Member States by Calliditas' partner, STADA Arzneimittel AG. Additionally, Calliditas

is conducting a Phase 2b/3 clinical trial in primary biliary cholangitis and a Phase 2 proof-of-concept trial in head and neck cancer

with its NOX inhibitor product candidate, setanaxib. Calliditas' common shares are listed on Nasdaq Stockholm (ticker: CALTX) and

its American Depositary Shares are listed on the Nasdaq Global Select Market (ticker: CALT). Visit www.calliditas.com for further

contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including,

without limitation, statements regarding Calliditas' strategy, business plans, regulatory submissions and focus, as well as Calliditas'

license agreement with Viatris, the parties' plans with respect to registration and commercialization of the specialty therapy,

the terms of the collaboration and the intended benefits therefrom, the regulatory pathway and interactions for Nefecon, including the

pursuit of Japanese marketing authorization and timing thereof. The words "may," "will," "could,"

"would," "should," "expect," "plan," "anticipate," "intend,"

"believe," "estimate," "predict," "project," "potential," "continue,"

"target" and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements

contain these identifying words. Any forward-looking statements in this press release are based on management's current expectations

and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ

materially from those expressed or implied by any forward-looking statements contained in this press release, including, without limitation,

any related to Calliditas' business, operations, the conduct of Calliditas' license agreement with Viatris, the potential

for regulatory acceptance and the success and timeline of its regulatory marketing application in Japan, clinical trials, supply chain,

strategy, goals and anticipated timelines, competition from other pharmaceutical companies, and other risks identified in the section

entitled "Risk Factors" in Calliditas' reports filed with the Securities and Exchange Commission. Calliditas cautions

you not to place undue reliance on any forward-looking statements, which speak only as of the date they are made. Calliditas disclaims

any obligation to publicly update or revise any such statements to reflect any change in expectations or in events, conditions or circumstances

on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in

the forward-looking statements. Any forward-looking statements contained in this press release represent Calliditas' views only

as of the date hereof and should not be relied upon as representing its views as of any subsequent date.