On June 9, 2020, the Company, Glaxo Wellcome UK Limited and Beecham S.A. entered into a definitive collaboration agreement under the terms set forth in the preliminary collaboration agreement entered into by the Company and certain GSK entities in April 2020 (the “2020 Preliminary Agreement”) (such definitive collaboration agreement, the “2020 GSK Agreement”). In December 2021, Beecham S.A. assigned and transferred all its rights, title, interest, and benefit in the 2020 GSK Agreement to GlaxoSmithKline Biologicals S.A. (Glaxo Wellcome UK Limited and GlaxoSmithKline Biologicals S.A., referred to, individually and together, as “GSK”), including all its rights to bring claims under such agreement. Concurrently with the execution of the 2020 Preliminary Agreement, the Company entered into a stock purchase agreement (the “2020 Stock Purchase Agreement”) with Glaxo Group Limited (“GGL”), an affiliate of GSK, under which GGL purchased 6,626,027 shares of the Company’s common stock on April 29, 2020, at a price per share of $37.73, for an aggregate purchase price of approximately $250.0 million. After receipt of antitrust clearance on April 22, 2020, the 2020 Preliminary Agreement became effective as of April 29, 2020, which was also the closing date for the 2020 Stock Purchase Agreement (“Effective Date”). Under the terms of the 2020 GSK Agreement, the Company and GSK agreed to collaborate to research, develop and commercialize products for the prevention, treatment and prophylaxis of diseases caused by SARS-CoV-2, the virus that causes COVID-19, and potentially other coronaviruses. The collaboration is focused on the development and commercialization of three types of collaboration products under three programs: (1) antibodies targeting SARS-CoV-2 and potentially other coronaviruses (the “Antibody Program”); (2) vaccines targeting SARS-CoV-2 and potentially other coronaviruses (the “Vaccine Program”), and (3) products based on genome-wide CRISPR screening of host targets expressed in connection with exposure to SARS-CoV-2 and potentially other coronaviruses (the “Functional Genomics Program”).

For four years following the Effective Date, the parties agreed to conduct certain research and development activities under mutually agreed development plans and associated budgets for each of the three programs, and under the oversight of a joint steering committee (“JSC”). The Company is primarily responsible for the development and clinical manufacturing activities for the Antibody Program, and for conducting the initial development activities directed to a vaccine in the Vaccine Program. GSK is primarily responsible for the global commercialization activities for the Antibody Program (including in mainland China, Hong Kong, Macau and Taiwan following the purchase of these rights in May 2022, as described below), the later-stage development, manufacturing and commercialization activities for the Vaccine Program and the development, manufacturing and commercialization activities for the Functional Genomics Program. Subject to an opt-out mechanism and Amendment No. 1 to the 2020 GSK Agreement (described below), the parties share all development costs, manufacturing costs and costs and expenses for the commercialization of the collaboration products, with the Company bearing 72.5% of such costs for the antibody products, 27.5% of such costs for the vaccine products, and equal sharing of such costs for the functional genomics products.

On a collaboration product-by-collaboration product basis, each party has the one-time right, at specified points in development, to opt-out of its co-funding obligations, and the other party may, at its election, either pursue such program unilaterally, or also cease research and development activities and funding of such collaboration product. If the opt-out provisions are not exercised by either party subject to the terms of the 2020 GSK Agreement, the parties share all profits and losses arising from any collaboration product in the same ratios in which the parties bore development costs for such collaboration program. For each collaboration product as to which a party exercises its opt-out right, the commercializing party pays to the opt-out party royalties on net sales of the applicable collaboration product at rates based on factors such as the stage of development of such collaboration product at the time the opt-out party exercises such right, and whether the opt-out party is the lead party, or a portion of the sublicense revenue if the commercializing party chooses to sublicense or otherwise divest rights to such collaboration product. On an antibody product-by-antibody product basis, the Company has a co-promotion right for such antibody product in the United States, under which the Company has the right to perform up to 20% of details in connection with such antibody product.

The 2020 GSK Agreement will remain in effect with respect to each collaboration program for as long as there is a collaboration product being developed or commercialized by the lead party, or the non-opt-out party, in such program. Either party has the right to terminate the 2020 GSK Agreement in the case of the insolvency of the other party, an uncured material breach of the other party with respect to a collaboration program or collaboration product, or as mutually agreed by the parties. The 2020 GSK Agreement superseded and replaced the 2020 Preliminary Agreement between the parties.

The Company considered the ASC 606 criteria for combining contracts and determined that the 2020 GSK Agreement and 2020 Stock Purchase Agreement should be combined into a single contract because they were negotiated and entered into in contemplation of one another. The fair market value of the common stock issued to GGL was $206.7 million, based on the closing stock price of $36.70 on the date of execution of the 2020 Preliminary Agreement and 2020 Stock Purchase Agreement and taking into account a discount for the lack of marketability due to the restrictions in place on the underlying shares, resulting in a $43.3 million premium received by the Company. The Company accounted for the common stock issued to GGL based on its fair market value on the transaction date and determined that the premium paid by GSK should be attributed to the transaction price of the 2020 GSK Agreement.

The Company concluded that the 2020 GSK Agreement contained four units of account: (i) the license granted to GSK under the Antibody Program (the “Antibody License”); (ii) the research and development activities (including clinical manufacturing) under the Antibody Program; (iii) the research and development activities under the Vaccine Program; and (iv) the research and development activities under the Functional Genomics Program. The Company considered the guidance in ASC 606 to determine which of these elements of the 2020 GSK Agreement are performance obligations with a customer. The Company determined that the Antibody License is within the scope of ASC 606 and, accordingly, accounted for the Antibody License as a distinct performance obligation under ASC 606. The Antibody License is a functional intellectual property and is distinct from the associated research and development activities to be performed under the program due to its significant standalone functionality. All other elements of the 2020 GSK Agreement, including the research and development activities and participation in the JSC and subcommittees for each collaboration program, were not determined to be distinct performance obligations with a customer.

The transaction price for the Antibody License at inception was determined to be $43.3 million, representing the premium on the sale of common stock to GSK. The Company determined that GSK can benefit from the Antibody License at the time of grant and, therefore, the related performance obligation is satisfied at a point in time. As such, the Company recognized the $43.3 million as contract revenue during the second quarter of 2020.

The remaining units of account of the 2020 GSK Agreement were determined to be within the scope of ASC 808 as the Company and GSK are both active participants in the development, manufacturing and commercialization activities and are exposed to significant risks and rewards that are dependent on the commercial success of the activities of the arrangement. Furthermore, the Company and GSK participate in the commercial profit and loss sharing arrangement for each program commensurate with each party’s cost-sharing responsibilities during research and development. Because ASC 808 does not provide recognition and measurement guidance, the Company determined that the guidance in ASC 730, Research and Development, was appropriate to analogize to, based on the nature of the cost-sharing provisions of the 2020 GSK Agreement. The Company has concluded that payments to or reimbursements from GSK related to these services will be accounted for as an increase to or reduction of research and development expenses, respectively. Additionally, the Company is entitled to consideration from GSK related to profit and loss sharing arrangements (including royalties) contingent upon future sales of collaboration products. The Company concluded that any payments from GSK related to the profit and loss sharing arrangement (including royalties) contingent upon the commercialization of the products will be analogized to ASC 606 and, therefore, will be recognized when the related sales occur.

In May 2021, the U.S. Food and Drug Administration (“FDA”) granted an EUA in the United States for sotrovimab, the first collaboration product under the Antibody Program. In April 2022, the FDA excluded the use of sotrovimab in all U.S. regions due to the continued proportion of COVID-19 cases caused by certain Omicron subvariants. As the lead party for all manufacturing and commercialization activities, GSK incurs all of the manufacturing, sales and marketing expenses and is the principal on sales transactions with third parties. As described in Note 1—Organization, the Company’s accounting policy related to the profit-share is to consider the agreed-upon share of the profit-sharing amounts each quarter and evaluate whether those amounts are subject to potential future adjustments based on the latest available facts and circumstances, subject to the terms of the 2020 GSK Agreement. As the Company is the agent, the Company recognizes its contractual share of the profit-sharing amounts or royalties (in case of an opt-out) as revenue, based on sales net of various estimated deductions such as rebates, discounts, chargebacks, credits and returns, less cost of sales and allowable expenses (including manufacturing, distribution, medical affairs, selling, and marketing expenses) in the period the sale occurs. Manufacturing costs include inventory revaluation adjustments, lower of cost or market inventory adjustments, inventory write-downs and write-offs, and binding purchase commitments with a third-party manufacturer among other manufacturing costs. The Company’s contractual share of the profit-sharing amounts is subject to potential future adjustments to

allowable expenses, which represents a form of variable consideration. At each reporting period, the Company evaluates the latest available facts and circumstances to determine whether any portion of profit-sharing amounts should be constrained.

As of June 30, 2022, GSK held certain potentially excess binding supply manufacturing commitments of sotrovimab and reserved certain binding manufacturing capacity potentially not expected to be utilized, which have not yet been reported to us as allowable manufacturing expenses for the cumulative profit-sharing amounts to date. We expect GSK to adjust allowable manufacturing expenses for our share of the potential charge for excess supply write-offs and unused binding manufacturing capacity and report to us as cost-sharing amounts in future periods. We evaluated the latest available facts and circumstances to determine whether any portion of profit-sharing amounts should be constrained. In doing so, as of June 30, 2022, based on the current state of the COVID-19 pandemic, including the continued proportion of cases caused by certain Omicron subvariants, recent discussions with the FDA and other regulatory authorities, and the Company’s expectations for future sales in light of these factors, the Company estimated that $397.4 million should be constrained from profit-sharing revenues earned during the quarter in relation to the Company’s anticipated contractual share of potential future adjustments to manufacturing expenses and recorded such amount as adjustments to profit-sharing amounts. The Company will re-assess these estimates each reporting period. Actual results could materially differ from this estimate.

During the three and six months ended June 30, 2022, the Company recorded profit-sharing amounts and profit-sharing amounts constrained as components of collaboration revenue in the unaudited condensed consolidated statements of operations, as follows:


	Three Months Ended June 30,					Six Months Ended June 30,
	2022			2021		2022			2021
	(in thousands)
Collaboration revenue, net
Profit-sharing amount	$	342,492		$	5,333	$	1,572,148		$	5,333
Profit-sharing amount constrained		(397,433	)		—		(397,433	)		—
Total collaboration revenue, net	$	(54,941	)	$	5,333	$	1,174,715		$	5,333

Costs associated with co-development activities performed under the 2020 GSK Agreement are included in research and development expenses on the unaudited condensed consolidated statements of operations, with any reimbursement of costs by GSK reflected as a reduction of such expenses. Under the 2020 GSK Agreement, the Company recognized additional net research and development expenses of $7.1 million and $17.9 million for the three months ended June 30, 2022 and 2021, respectively, and $13.6 million and $36.4 million for the six months ended June 30, 2022 and 2021, respectively.

On May 27, 2022, the Company and GSK entered into Amendment No. 1 to the 2020 GSK Agreement (“Amendment No. 1”). Pursuant to Amendment No. 1, the parties acknowledged that the antibody products that had been licensed to WuXi Biologics (Hong Kong) Limited ("WuXi Biologics") in mainland China, Hong Kong, Macau and Taiwan and had reverted to the Company pursuant to the Termination Agreement (described below) are now included in and governed by the 2020 GSK Agreement, subject to certain amendments relating to sotrovimab.

Under the terms of Amendment No. 1, GSK has the sole right to develop (including to seek, obtain or maintain regulatory approvals), manufacture and commercialize sotrovimab in and for mainland China, Hong Kong, Macau and Taiwan at GSK's sole cost and expense (other than certain payments for which the Company remains responsible under certain of the Company’s existing agreements with third parties). GSK paid the Company a one-time upfront payment of $7.0 million in consideration for the rights and licenses granted to GSK under Amendment No. 1. The Company recognized contract revenue of $7.0 million during the three months ended June 30, 2022. In addition, GSK will be obligated to pay the Company tiered royalties on net sales of sotrovimab in mainland China, Hong Kong, Macau and Taiwan in percentages ranging from the high teens to the low thirties. Such royalties are payable to the Company during the term of the 2020 GSK Agreement applicable to the Antibody Program.

On February 14, 2021, the Company and GSK entered into a binding preliminary collaboration agreement (the “2021 Preliminary Agreement”) under which the parties agreed to expand the 2020 GSK Agreement to collaborate on three separate programs: (1) a program to research, develop and commercialize mAbs for the prevention, treatment or prophylaxis of the influenza virus (the “Influenza Program”), excluding VIR-2482 unless GSK exercises its option as described below; (2) an expansion of the parties’ current Functional Genomics Program to focus on functional genomics screens directed to targets associated with respiratory viruses

(the “Expanded Functional Genomics Program”); and (3) additional programs to develop neutralizing mAbs directed to up to three non-influenza target pathogens selected by GSK (the “Selected Pathogens” and such programs, the “Additional Programs”).

Concurrently with the execution of the 2021 Preliminary Agreement, the Company entered into a stock purchase agreement (the “2021 Stock Purchase Agreement”) with GGL under which GGL agreed to purchase shares of the Company’s common stock for an aggregate purchase price of approximately $120.0 million. The consummation of the transactions under each of the 2021 Preliminary Agreement and the 2021 Stock Purchase Agreement were subject to the satisfaction of customary closing conditions, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, which expiration was effective on March 24, 2021. The 2021 Preliminary Agreement and 2021 Stock Purchase Agreement consummated on March 25, 2021, which the Company used as the measurement date for accounting purposes. On March 31, 2021, the Company closed the sale of 1,924,927 shares of its common stock to GGL.

The 2021 Preliminary Agreement was superseded on May 18, 2021 upon execution of the definitive collaboration agreement (the “2021 GSK Agreement”, and collectively with the 2021 Preliminary Agreement, the “2021 GSK Collaboration”). The material terms of the 2021 GSK Agreement, including the promised goods and services, are discussed below and are consistent with those of the 2021 Preliminary Agreement.

Under the 2021 GSK Collaboration, the parties will conduct certain research and development activities under mutually agreed development plans and associated budgets for the programs within the expanded collaboration for a period of three years following the effective date. Under the Influenza Program, the parties will collaborate to research, develop and commercialize mAbs for the prevention, treatment or prophylaxis of influenza, including the Company’s influenza mAbs (with respect to VIR-2482, only if GSK exercises its option). The Company may conduct the development and clinical manufacturing activities for VIR-2482 up to the completion of a Phase 2 clinical trial. Provided that the Company conducts and completes a Phase 2 clinical trial for VIR-2482, GSK will have the exclusive option to obtain exclusive rights to co-develop and commercialize VIR-2482 under the Influenza Program (the “VIR-2482 Option”). GSK will be the lead party for development, clinical and commercial manufacturing and commercialization activities for products under the Influenza Program (other than VIR-2482 unless and until GSK exercises the VIR-2482 Option, if applicable). The parties will mutually agree upon the allocation of responsibility for the development of products under the Expanded Functional Genomics Program, and for the development and early-stage manufacturing of products under the Additional Programs if and when GSK decides which Selected Pathogens to pursue. GSK will be primarily responsible for commercial manufacturing and commercialization activities for products under the Expanded Functional Genomics Program and Additional Programs, if and when selected by GSK. For each collaboration program, upon execution of the definitive agreement, the Company will grant GSK certain license rights related to the development, manufacturing and commercialization of products arising from the program.

The parties will share 50% of all development costs in accordance with the budget for each of the collaboration programs (other than for the Selected Pathogens and VIR-2482, unless GSK exercises the VIR-2482 Option), with each party having the right to opt-out of its co-funding obligations at specified points in development. In such case, the party continuing with the program will pay to the opt-out party a royalty on net sales of products arising from such program at specified rates based on the stage of development at which the opt-out is exercised. Following the exercise of an opt-out right by a party, the other party may, at its election, either pursue development and commercialization of such product or program unilaterally, or also cease the conduct and funding of such collaboration product or program. In the absence of any opt-out, the parties will also share 50% of all profits and losses arising from any collaboration product.

GSK was obligated to make an upfront payment to the Company of $225.0 million, 50% of which became payable at the effective date of the 2021 Preliminary Agreement and 50% of which became payable following the execution of the 2021 GSK Agreement. If GSK exercises the VIR-2482 Option, GSK will pay the Company an option exercise fee of $300.0 million unless certain agreed product criteria for VIR-2482 are not met, in which case the parties will negotiate an alternative option exercise fee. Upon achievement of a pre-defined regulatory milestone for the first product in the Influenza Program, which may be (i) VIR-2482 (if GSK exercised the VIR-2482 Option), (ii) a next-generation mAb, or (iii) any other influenza mAb approved by the JSC to be included in the collaboration, arising from the Influenza Program, GSK will make a milestone payment to the Company of up to $200.0 million.

The Company concluded that the 2021 GSK Agreement is a collaboration arrangement as defined in ASC 808, Collaborative Agreements, under which certain elements are required to be accounted for under ASC 606 where the counterparty is a customer for a good or service that is a distinct unit of account. In addition, the 2021 GSK Agreement is considered a contract modification to the 2021 Preliminary Agreement and will be accounted for prospectively as a termination of the 2021 Preliminary Agreement and commencement of a new contract. There was no impact to the accounting assessment of the original contract as no goods or services had been delivered to GSK, no performance obligations were satisfied and, accordingly, no contract revenue was recognized under ASC 606 prior to the execution of the 2021 GSK Agreement.

The Company considered the ASC 606 criteria for combining contracts and determined that the 2021 GSK Collaboration and 2021 Stock Purchase Agreement should be combined into a single contract because they were negotiated and entered into in contemplation of one another. The fair market value of the common stock issued to GGL was $85.2 million, based on the closing stock price of $52.70 on March 25, 2021, and taking into account a discount for the lack of marketability due to the restrictions in place on the underlying shares, resulting in a $34.8 million premium received by the Company. The Company accounted for the common stock issued to GGL based on its fair market value on the transaction date and determined that the premium paid by GSK should be attributed to the transaction price of the 2021 GSK Agreement.

The Company concluded that the 2021 GSK Agreement contained the following units of account: (i) the VIR-2482 Option; (ii) three distinct rights granted to GSK related to the Selected Pathogens (each, a “Selected Pathogens Right”); (iii) the license and know-how to the next-generation mAbs under the Influenza Program (the “Next Gen License”); (iv) the research and development activities for next-generation mAbs under the Influenza Program; and (v) the research and development activities, including license rights and know-how, under the Expanded Functional Genomics Program. The Company considered the guidance in ASC 606 to determine which of these elements of the 2021 GSK Agreement are performance obligations with a customer. The Company determined that the distinct performance obligations under ASC 606 consisted of (i) the Next Gen License and (ii) the three Selected Pathogens Rights, each representing a material right. All other elements of the 2021 GSK Agreement including the VIR-2482 Option, research and development activities, and participation in the JSC and subcommittees for each collaboration program were not determined to be distinct performance obligations with a customer. As of June 30, 2022, GSK had not exercised the VIR-2482 Option or the three Selected Pathogens Rights.

The transaction price for the 2021 GSK Agreement included fixed consideration consisting of the $225.0 million upfront fee paid by GSK and $34.8 million, representing the premium on the sale of common stock to GSK for a total of $259.8 million. All potential future milestones and other payments under the 2021 GSK Agreement are constrained since the Company could not conclude it was probable that a significant reversal in the amount recognized would not occur.

The respective estimated SSP for each of the performance obligations was determined to allocate the transaction price. The estimated SSP of each performance obligation was determined using methods that considered relevant market conditions, entity-specific factors and information about GSK, while maximizing the use of available observable inputs and using certain management assumptions (e.g., treatable patient population, expected market share, probability of success and product profitability, discount rate based on weighted-average cost of capital). For the Next Gen License, the Company determined that GSK can benefit from the license at the time the license is granted and, therefore, the related performance obligation is satisfied at a point in time. If any of the Selected Pathogens Rights are exercised, the Company will evaluate the related promises to identify the performance obligations to be transferred and the timing of revenue recognition. If any of the Selected Pathogens Rights expire prior to being exercised, the Company will recognize any deferred revenue allocated to that right as revenue at the time of expiration.

The research and development activities for the next-generation mAbs under the Influenza Program and the Expanded Functional Genomics Program were determined to be within the scope of ASC 808 as the Company and GSK are both active participants in the development, manufacturing and commercialization activities and are exposed to significant risks and rewards that are dependent on the commercial success of the activities of the arrangement. Furthermore, the Company and GSK participate in the commercial profit and loss sharing arrangement for each program commensurate with each party’s cost-sharing responsibilities during research and development. Because ASC 808 does not provide recognition and measurement guidance, the Company determined that the guidance in ASC 730, Research and Development, was appropriate to analogize to based on the nature of the cost-sharing provisions of the agreement. The Company has concluded that payments to or reimbursements from GSK related to these services will be accounted for as an increase to or reduction of research and development expenses, respectively. The Company also concluded that any payments from GSK related to the profit and loss sharing arrangement (including royalties) contingent upon the commercialization of the related products will be analogized to ASC 606 and, therefore, will be recognized when the related sales occur.

Upon execution of the 2021 GSK Agreement, the Company granted the Next Gen License to GSK and therefore, recognized $168.3 million as contract revenue in the second quarter of 2021. As of June 30, 2022 and December 31, 2021, the total unrecognized transaction price of $91.5 million is classified as current deferred revenue on the unaudited condensed consolidated balance sheets related to the remaining performance obligations, being the material rights resulting from the Selected Pathogens Rights, none of which have been exercised by GSK as of June 30, 2022. The Company expects the rights will be exercised, and thus, the corresponding deferred revenue will be recognized within 12 months from June 30, 2022.

Costs associated with co-development activities performed under the 2021 GSK Agreement are included in research and development expenses in the unaudited condensed consolidated statements of operations, with any reimbursement of costs by GSK reflected as a reduction of such expenses. During the three and six months ended June 30, 2022, the Company recognized additional net research

and development expenses of $0.9 million and $1 million under the 2021 GSK Agreement, respectively. During the three and six months ended June 30, 2021, the Company recognized a reduction of research and development expenses of $0.1 million under the 2021 GSK Agreement.

Under both the 2020 GSK Agreement and the 2021 GSK Agreement, the Company has a receivable from collaboration of $7.0 million and $773.1 million as of June 30, 2022 and December 31, 2021, respectively.

In May 2018, the Company entered into the Brii Agreement with Brii Bio Parent and Brii Bio, pursuant to which the Company granted to Brii Bio, with respect to up to four of the Company’s programs, an exclusive option to obtain exclusive rights to develop and commercialize compounds and products arising from such programs in China, Taiwan, Hong Kong and Macau (collectively, the “China Territory”) for the treatment, palliation, diagnosis, prevention or cure of acute and chronic diseases of infectious pathogen origin or hosted by pathogen infection (the “Field of Use”). The Company’s HBV small interfering ribonucleic acid (“siRNA”) program being developed under the Amended Alnylam Agreement (described below) is included within the Brii Agreement as a program for which Brii Bio may exercise one of its options. In partial consideration for the options granted by the Company to Brii Bio, Brii Bio Parent and Brii Bio granted the Company, with respect to up to four of Brii Bio Parent’s or Brii Bio’s programs, an exclusive option to be granted exclusive rights to develop and commercialize compounds and products arising from such Brii Bio programs in the United States for the Field of Use. The number of options that the Company may exercise for a Brii Bio program is limited to the corresponding number of options that Brii Bio exercises for a Vir program.

As partial consideration for the Company’s entry into the Brii Agreement, upon closing of Brii Bio Parent’s Series A preferred stock financing, the Company received ordinary shares equal to 9.9% of the outstanding shares in Brii Bio Parent. As a result of Brii Bio’s right to exercise one of its options for the Company’s HBV siRNA program, under the terms of the Amended Alnylam Agreement the Company transferred to Alnylam Pharmaceuticals, Inc. (“Alnylam”) a specified percentage of such equity consideration allocable to such program under a share transfer agreement in February 2020.

With respect to programs for which Brii Bio exercises its options, Brii Bio is required to pay the Company an option exercise fee for each such Vir program ranging from the mid-single-digit millions up to $20.0 million, determined based on the commercial potential of the licensed program. Brii Bio will also be required to pay regulatory milestone payments on a licensed product-by-licensed product basis ranging from the mid-single-digit millions up to $30.0 million, also determined based on the commercial potential of such program. Following commercialization, Brii Bio will be required to make sales milestone payments based on certain specified levels of aggregate annual net sales of products arising from each licensed program in the China Territory, up to an aggregate of $175.0 million per licensed program. Brii Bio also will pay royalties to the Company that range from the mid-teens to the high-twenties, as described below.

Upon exercise of each option for a Brii Bio program, the Company will be required to pay to Brii Bio an option exercise fee ranging from the low tens of millions to up to $50.0 million, determined based on the commercial potential of the licensed program. The Company will be required to make regulatory milestone payments to Brii Bio on a licensed product-by-licensed product basis ranging from the low tens of millions up to $100.0 million, also determined based on the commercial potential of such program. The Company will also be required to make sales milestone payments based on certain specified levels of aggregate annual net sales of products in the United States arising from each licensed program, up to an aggregate of $175.0 million per licensed program. As of June 30, 2022, the Company has not exercised any of its options.

In addition, the Company is obligated under the Brii Agreement to pay Brii Bio tiered royalties based on net sales of products arising from the licensed programs in the United States, and Brii Bio is obligated to pay the Company tiered royalties based on net sales of products arising from the licensed programs in the China Territory. The rates of royalties payable by the Company to Brii Bio, and by Brii Bio to the Company, on net sales range from mid-teens to high-twenties. Each party’s obligations to pay royalties expires, on a product-by-product and territory-by-territory basis, on the latest of 10 years after the first commercial sale of such licensed product in the United States or China Territory, as applicable; the expiration or abandonment of licensed patent rights that cover such product in the United States or China Territory, as applicable; and the expiration of regulatory exclusivity in the United States or the China Territory, as applicable. Royalty rates are subject to specified reductions and offsets.

The Brii Agreement will remain in force until the expiration of all options or, if any option is exercised, expiration of all royalty payment obligations for all licensed products within such licensed program, unless terminated in its entirety or on a program-by-program basis by either party. Each party may terminate for convenience all rights and obligations with respect to any program for which it has an option, with 30 days’ written notice (if the terminating party has not exercised an option for such program) or 180

days' notice (following the exercise of an option for such program). The Brii Agreement may also be terminated by either party for insolvency of the other party, and either party may terminate the Brii Agreement in its entirety or on a program-by-program basis for the other party’s uncured material breach on 60 days’ written notice (or 30 days’ notice following failure to make payment).

From May 2018 until the closing of the Brii Bio Parent IPO in July 2021, Brii Bio Parent and its wholly-owned subsidiary Brii Bio were determined to be variable interest entities (“VIE”) due to their reliance on future financing and having insufficient equity at risk. However, the Company did not have the power to direct activities that most significantly impact the economic success of these entities and was not considered the primary beneficiary of these entities. Therefore, the Company did not consolidate Brii Bio Parent or Brii Bio. Subsequent to the Brii Bio Parent IPO, the Company determined that these entities are no longer VIEs. In addition, as Brii Bio Parent is a publicly-traded company, the Company's investment in its ordinary shares became a marketable equity investment with readily determinable fair value and is then subsequently remeasured to fair value at each reporting date (see Note 3—Fair Value Measurements). Prior to the Brii Bio Parent IPO, the Company accounted for its investment in Brii Bio Parent, which had a carrying value of $5.7 million, at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment from the same issuer.

In June 2020, Brii Bio exercised its option to obtain exclusive rights to develop and commercialize compounds and products arising from VIR-2218 in the China Territory. In consideration of the Company’s grant to Brii Bio of an exclusive license related to VIR-2218 in the China Territory, the Company received a $20.0 million option exercise fee in connection with the option exercise. Also, the Company is eligible to receive the following payments related to VIR-2218 in the China Territory: a $30.0 million regulatory milestone payment, up to $175.0 million in sales-based milestone payments, and royalties on net sales ranging from high-teens to high-twenties.

The Company evaluated the transaction under ASC 606 and identified one performance obligation consisting of the license granted to Brii Bio. Under the Brii Agreement, Brii Bio is responsible for performing all research and development activities and the Company does not have any other performance obligations within the context of ASC 606 under the arrangement after the option exercise.

During the three and six months ended June 30, 2022, the Company recognized $1.3 million and $1.3 million, respectively, as contract revenue from the supply of biological materials to Brii Bio. During the three and six months ended June 30, 2021, the Company recognized zero and $0.4 million, respectively, as contract revenue from the supply of biological materials to Brii Bio.

As of June 30, 2022, the Company also has a contract liability of $2.3 million and $1.5 million within current and noncurrent deferred revenues, respectively, which represents deferred consideration for the remaining three options that the Company granted to Brii Bio. The deferred consideration will be recognized when Brii Bio exercises its remaining options or the remaining options expire.

In October 2017, the Company entered into the collaboration and license agreement with Alnylam, as amended in December 2019, and March, April and December 2020 (the “Amended Alnylam Agreement”) for the development of siRNA products for the treatment of HBV, and following the exercise of certain program options, the development and commercialization of siRNA therapeutic products directed to up to four other infectious disease targets selected by the Company. The technology licensed under the Amended Alnylam Agreement forms the basis of the Company’s siRNA technology platform.

Under the Amended Alnylam Agreement, the Company obtained a worldwide, exclusive license to develop, manufacture and commercialize the HBV siRNA product candidates, including VIR-2218, for all uses and purposes other than agricultural, horticultural, forestry, aquaculture and other residential applications (such excluded fields, the “Excluded Fields”). In addition, Alnylam granted the Company an exclusive option, for each of the infectious disease siRNA programs directed to the Company’s selected targets, to obtain a worldwide, exclusive license to develop, manufacture and commercialize siRNA products directed to the target of each such program for all uses and purposes other than the Excluded Fields. On a product-by-product basis for each product arising from the HBV and, following the Company’s option exercise, the infectious disease programs, Alnylam has an exclusive option, exercisable during a specified period prior to the initiation of a Phase 3 clinical trial for each such product, to negotiate and enter into a profit-sharing agreement for such product.

The Company and Alnylam are jointly responsible for funding the initial research and development activities for VIR-2218 through the completion of proof-of-concept trials. Prior to the exercise of the Company’s option for each siRNA program directed to one of the Company’s selected infectious disease targets, Alnylam is responsible for conducting all development activities, at the Company’s

expense, in accordance with an agreed-upon development plan. Following the Company’s exercise of an option for a program and payment of the program option exercise fee and any outstanding program costs due to Alnylam, the Company is solely responsible, at the Company’s expense (subject to Alnylam’s exercise of a profit-sharing option), for conducting all development, manufacture and commercialization activities for products arising from each such program. If Alnylam exercises a profit-sharing option for a product, the Company will negotiate the terms of such profit-sharing agreement, which will include sharing equally with Alnylam all subsequent costs associated with the development of such product, as well as the profits and losses in connection with such product, subject to reimbursement by Alnylam of a portion of specified development costs in certain circumstances.

The Company will be required to pay Alnylam up to $190.0 million in the aggregate for the achievement of specified development and regulatory milestones by the first siRNA product directed to HBV, and up to $115.0 million for the achievement of specified development and regulatory milestones by the first product directed to the target of each infectious disease siRNA program for which the Company exercised its option. Following commercialization, the Company will be required to pay to Alnylam up to $250.0 million in the aggregate for the achievement of specified levels of net sales by siRNA products directed to HBV and up to $100.0 million for the achievement of specified levels of net sales by products directed to the target of each infectious disease siRNA program for which the Company exercised its option. The Company may also be required to pay Alnylam tiered royalties at percentages ranging from the low double-digits to mid-teens on annual net sales of HBV products, and tiered royalties at percentages ranging from the high single-digits to the sub-teen double-digits on annual net sales of licensed infectious disease products, in each case subject to specified reductions and offsets. The royalties are payable on a product-by-product and country-by-country basis until the later of the expiration of all valid claims of specified patents covering such product in such country and 10 years after the first commercial sale of such product in such country.

The term of the Amended Alnylam Agreement will continue, on a product-by-product and country-by-country basis, until the expiration of all royalty payment obligations under the Amended Alnylam Agreement. If the Company does not exercise its option for an infectious disease program directed to one of its selected targets, the Amended Alnylam Agreement will expire upon the expiration of the applicable option period with respect to such program. However, if Alnylam exercises its profit-sharing option for any product, the term of the Amended Alnylam Agreement will continue until the expiration of the profit-sharing arrangement for such product. The Company may terminate the Amended Alnylam Agreement on a program-by-program basis or in its entirety for any reason on 90 days’ written notice. Either party may terminate the agreement for cause for the other party’s uncured material breach on 60 days’ written notice (or 30 days’ notice for payment breach), or if the other party challenges the validity or enforceability of any patent licensed to it under the Amended Alnylam Agreement on 30 days’ notice.

The Company incurred expenses under the Amended Alnylam Agreement of $0.1 million and $0.3 million during the three and six months ended June 30, 2022, respectively. The Company incurred expenses under the Amended Alnylam Agreement of $0.8 and $1.7 million during the three and six months ended June 30, 2021, respectively.

In February 2020, the Company entered into a development and manufacturing collaboration agreement with WuXi Biologics (the “WuXi Biologics Collaboration Agreement”) for the clinical development, manufacturing, and commercialization of the Company’s proprietary antibodies developed for SARS-CoV-2. Under the WuXi Biologics Collaboration Agreement, WuXi Biologics conducted cell-line development, process and formulation development, and initial manufacturing for clinical development, WuXi Biologics had the right to commercialize products incorporating such SARS-CoV-2 antibodies in mainland China, Hong Kong, Macau and Taiwan under an exclusive license granted for the selected SARS-CoV-2 antibodies that were developed, the Company had the right to commercialize such products in all other markets worldwide.

On May 16, 2022, the Company and WuXi Biologics entered into a Termination Agreement (the “Termination Agreement”) pursuant to which the Company and WuXi Biologics terminated the WuXi Biologics Collaboration Agreement. Other existing agreements between the Company and WuXi Biologics remain in effect.

Under the terms of the Termination Agreement, all licenses granted under the WuXi Biologics Collaboration Agreement were terminated and all rights to the antibody products in mainland China, Hong Kong, Macau and Taiwan reverted to the Company. The Company will make a one-time termination payment to WuXi Biologics of $7.0 million and account for the payment as an acquisition of an in-process research and development asset and, therefore, recognized research and development expense of $7.0 million during the second quarter of 2022. Under the terms of the Termination Agreement, the Company will be obligated to pay WuXi Biologics tiered royalties on net sales of sotrovimab in mainland China, Hong Kong, Macau and Taiwan ranging from low single digits to low

double digits. Royalties are payable to WuXi Biologics for a specified royalty term and are subject to reduction in certain circumstances.

In July 2018, the Company entered into an exclusive license agreement with The Rockefeller University (“Rockefeller”), which was amended in May 2019, in September 2020, and in March 2021 (as amended, the “Rockefeller Agreement”). Under the Rockefeller Agreement, Rockefeller granted the Company a worldwide exclusive license under certain patent rights, and a worldwide non-exclusive license under certain materials and know-how covering certain antibody variants relating to a specified mutation leading to enhanced antibody function and utility, to develop, manufacture and commercialize infectious disease products covered by the licensed patents, or that involve the use or incorporation of the licensed materials and know-how, in each case for all uses and purposes for infectious diseases. The Company uses technology licensed under the Rockefeller Agreement in the Company’s antibody platform and in the Company’s product candidates VIR-3434 and VIR-7832.

The Company is required to pay annual license maintenance fees of $1.0 million, which can be creditable against royalties following commercialization. In addition, upon achievement of specified development, regulatory and commercial success milestone events, the Company is required to pay up to $80.3 million, in the aggregate, for up to six infectious disease products. Any follow-on products beyond six products may result in additional milestone event payments. The Company will also be required to pay to Rockefeller a royalty at a low single-digit percentage rate on net sales of licensed products, subject to certain adjustments. The Company’s obligation to pay royalties to Rockefeller will terminate, on a product-by-product and jurisdiction-by-jurisdiction basis, upon the latest of the expiration of the last valid claim of a licensed patent in such jurisdiction, the expiration of all regulatory exclusivity in such jurisdiction or 12 years following the first commercial sale of the applicable licensed product in such jurisdiction.

Under the Rockefeller Agreement, the Company recognized a total of $1.1 million during the three and six months ended June 30, 2022, and a total of $4.0 million and $1.3 million during the three and six months ended June 30, 2021, respectively, as research and development expenses related to certain development milestone payments, annual license maintenance fees, and estimated sublicense fees.

The Rockefeller Agreement will remain in force, absent earlier termination, until the expiration of all of the Company’s obligations to pay royalties to Rockefeller in all jurisdictions. The Company has the right to terminate the Rockefeller Agreement in its entirety, or in part, for any reason on 60 days’ written notice to Rockefeller. Rockefeller may terminate the Rockefeller Agreement on 90 days’ written notice for the Company’s uncured material breach, or if the Company challenges the validity or enforceability of any of the licensed patents, or immediately in the event of the Company’s insolvency. Rockefeller may also terminate the Rockefeller Agreement if the Company ceases to carry on business with respect to the rights granted to the Company under the Rockefeller Agreement.

In September 2018, the Company entered into a license agreement, which was amended in September 2020 (as amended, the “MedImmune Agreement”), with MedImmune, LLC (“MedImmune”), under which the Company obtained a worldwide, exclusive license to develop and commercialize half-life extended versions of two specified antibodies under development by MedImmune that target influenza A and influenza B, respectively, for all uses in humans and animals. The Company is developing VIR-2482 using technology licensed under the MedImmune Agreement.

The Company is obligated to make development, regulatory, and commercial milestone payments of up to $331.5 million in the aggregate relating to influenza A and influenza B products. MedImmune is also entitled to receive tiered royalties based on net sales of products containing half-life extended versions of antibodies directed to influenza A and/or influenza B at percentages ranging from the mid-single-digits to sub-teen double-digits.

The MedImmune Agreement will remain in force until the expiration on a country-by-country and product-by-product basis of all of the Company’s obligations to pay royalties to MedImmune. The Company may terminate the MedImmune Agreement in its entirety or on a product-by-product basis, for convenience, upon 120 days’ notice. Either party may terminate the MedImmune Agreement for cause for the other party’s uncured material breach on 60 days’ notice or immediately in the event of bankruptcy of the other party. Additionally, MedImmune may terminate the MedImmune Agreement for cause on 30 days’ written notice if the Company challenges the validity or enforceability of the patents to which the Company has obtained a license under the MedImmune Agreement.

In August 2019, the Company entered into a patent license agreement, which was amended in February 2021 (as amended, the “2019 Xencor Agreement”) with Xencor, Inc. (“Xencor”). Under the 2019 Xencor Agreement, the Company obtained a non-exclusive, sublicensable (only to its affiliates and subcontractors) license to incorporate Xencor’s licensed technologies into, and to evaluate, antibodies that target influenza A and HBV, and a worldwide, non-exclusive, sublicensable license to develop and commercialize products containing such antibodies incorporating such technologies for all uses, including the treatment, palliation, diagnosis and prevention of human or animal diseases, disorders or conditions. The Company is obligated to use commercially reasonable efforts to develop and commercialize an antibody product that incorporates Xencor’s licensed technologies, for each of the influenza A and HBV research programs. These technologies are used in the Company’s VIR-2482, incorporating Xencor’s Xtend technology, and VIR-3434, incorporating Xencor’s Xtend and other Fc technologies, product candidates.

For each of the influenza A and HBV research programs, the Company is required to pay Xencor development and regulatory milestone payments of up to $17.8 million in the aggregate, and commercial sales milestone payments of up to $60.0 million in the aggregate, for a total of up to $77.8 million in aggregate milestones for each program and $155.5 million in aggregate milestones for both programs. On a product-by-product basis, the Company is also obligated to pay tiered royalties based on net sales of licensed products ranging from low- to mid-single-digits. The royalties are payable, on a product-by-product and country-by-country basis, until the expiration of the last to expire valid claim in the licensed patents covering such product in such country.

Under the 2019 Xencor Agreement, the Company did not recognize any research and development expenses during the three and six months ended June 30, 2022 and 2021.

In March 2020, the Company entered into a patent license agreement, which was amended in February 2021 (as amended, the “2020 Xencor Agreement”) with Xencor under which the Company obtained a non-exclusive, sublicensable (only to the Company’s affiliates and subcontractors) license to incorporate Xencor’s licensed technologies into, and to evaluate, antibodies that target any component of a coronavirus, including SARS-CoV-2, SARS-CoV and MERS-CoV, and a worldwide, non-exclusive, sublicensable license to develop and commercialize products containing such antibodies incorporating such technologies for all uses, including the treatment, palliation, diagnosis and prevention of human or animal diseases, disorders or conditions. The Company is obligated to use commercially reasonable efforts to develop and commercialize an antibody product that incorporates Xencor’s licensed technologies, for each of the coronavirus research programs. These technologies are used in sotrovimab, incorporating Xencor’s Xtend technology, and VIR-7832, incorporating Xencor’s Xtend and other Fc technologies.

In consideration for the grant of the license, the Company is obligated to pay royalties based on net sales of licensed products at the mid-single-digits. The royalties are payable, on a product-by-product and country-by-country basis, until the later of the expiration of the last to expire valid claim in the licensed patents covering such product in such country or 12 years. The Company recognized $22.1 million and $92.1 million during the three and six months ended June 30, 2022, respectively, and $0.9 million during the three and six months ended June 30, 2021, as cost of revenue for royalties due to Xencor from the sale of sotrovimab.

The 2020 Xencor Agreement and 2019 Xencor Agreement will remain in force, on a product-by-product and country-by-country basis, until the expiration of all royalty payment obligations under each of the respective agreements. The Company may terminate each agreement in its entirety, or on a target-by-target basis, for convenience upon 60 days’ written notice. Either party may terminate each agreement for the other party’s uncured material breach upon 60 days’ written notice (or 30 days in the case of non-payment) or in the event of bankruptcy of the other party immediately upon written notice. Xencor may terminate each agreement immediately upon written notice if the Company challenges, or upon 30 days’ written notice if any of the Company’s sublicensees challenge, the validity or enforceability of any patent licensed to the Company under each respective agreement.