Biggest changeResearch and Development Expenses Year Ended December 31, 2024 2023 Increase (Decrease) (in thousands) Direct research and development expenses TED portfolio $ 131,133 $ 71,646 59,487 FcRn inhibitor portfolio 41,941 29,973 11,968 Other nonclinical and research and development costs 3,001 13,540 (10,539) Unallocated expenses Personnel related expense (including share based compensation) 55,237 39,608 15,629 Facility and other operating costs 6,942 4,998 1,944 Total research and development expenses $ 238,254 $ 159,765 $ 78,489 Direct costs related to the TED portfolio increased by $59.5 million during the year ended December 31, 2024 compared to the year ended December 31, 2023, primarily attributable to: • $50.5 million increase in clinical trial costs and a $10.9 million increase in chemistry, manufacturing and controls costs to support the veligrotug and VRDN-003 clinical trials.
Biggest changeResearch and Development Expenses Year Ended December 31, 2025 2024 Increase (Decrease) (in thousands) Direct research and development expenses TED portfolio $ 209,480 $ 131,133 $ 78,347 FcRn inhibitor portfolio 46,394 41,941 4,453 Other research programs and expenses 7,036 3,001 4,035 Unallocated expenses Personnel-related (including share-based compensation) 69,555 55,237 14,318 Facility and other expenses 6,464 6,942 (478) Total research and development expenses $ 338,929 $ 238,254 $ 100,675 Direct costs related to the TED portfolio increased by $78.3 million during the year ended December 31, 2025 compared to the year ended December 31, 2024, primarily driven by the progression of our portfolio, including the following: • $55.6 million increase in clinical trial costs and an $8.7 million increase in chemistry, manufacturing and controls costs to support multiple ongoing phase 3 clinical trials for veligrotug and elegrobart clinical trials; and • $11.4 million increase in milestone, license and option fees due under our license agreement with ImmunoGen. 96 Direct costs related to the FcRn inhibitor portfolio increased by $4.5 million during the year ended December 31, 2025 compared to the year ended December 31, 2024, primarily attributable to: • $7.0 million increase in clinical trial costs to support a phase 1 clinical trial for VRDN-006; and • $5.2 million increase in chemistry, manufacturing and controls costs to support IND-enabling activities; partially offset by • $8.3 million decrease in nonclinical research due to timing and stage of development of the FcRn inhibitor portfolio.
The change in working capital was primarily related to an increase of $21.5 million in accounts payable and accrued and other liabilities, partially offset by an increase of $11.8 million in prepaid expenses and other current assets due to the timing of payments and prepayments to vendors for ongoing clinical trial and manufacturing activities.
The change in working capital was primarily related to an increase of $21.5 million in accounts payable, accrued liabilities and other liabilities, partially offset by an increase of $11.8 million in prepaid expenses and other current assets due to the timing of payments and prepayments to vendors for ongoing clinical trial and manufacturing activities.
Research and Development Expenses Research and development expenses consist of costs incurred for the research and development of our therapeutic programs and product candidates, which include: • employee-related expenses, including salaries, severance, retention, benefits, insurance, and share-based compensation expense; • expenses incurred under agreements with CROs, investigative sites that conduct our clinical trials, and other clinical trial-related vendors, and consultants; • the costs of acquiring, developing, and manufacturing and testing clinical and nonclinical materials, including costs incurred under agreements with CDMOs; • costs associated with nonclinical activities and regulatory operations; • license fees and milestone payments related to the acquisition and retention of certain licensed technology and intellectual property rights; and 84 • facilities, depreciation, market research, and other expenses, which include allocated expenses for rent and maintenance of facilities, depreciation of leasehold improvements and equipment, and laboratory supplies.
Research and Development Expenses Research and development expenses consist of costs incurred for the research and development of our therapeutic programs and product candidates, which include: • employee-related expenses, including salaries, severance, retention, benefits, insurance, and share-based compensation expense; • expenses incurred under agreements with CROs, investigative sites that conduct our clinical trials, and other clinical trial-related vendors, and consultants; • the costs of acquiring, developing, and manufacturing and testing clinical and nonclinical materials, including costs incurred under agreements with CDMOs; • costs associated with nonclinical activities and regulatory operations; • license fees and milestone payments related to the acquisition and retention of certain licensed technology and intellectual property rights; and • facilities, depreciation, market research, and other expenses, which include allocated expenses for rent and maintenance of facilities, depreciation of leasehold improvements and equipment, and laboratory supplies.
Global Economic Considerations 83 The global macroeconomic environment is uncertain, and could be negatively affected by, among other things, increased U.S. trade tariffs and trade disputes with other countries, instability in the global capital and credit markets, supply chain weaknesses, and instability in the geopolitical environment, including as a result of the Russian invasion of Ukraine, the rising tensions between China and Taiwan, the conflict in Israel and surrounding area and other political tensions.
Global Economic Considerations The global macroeconomic environment is uncertain, and could be negatively affected by, among other things, increased U.S. trade tariffs and trade disputes with other countries, instability in the global capital and credit markets, supply chain weaknesses, and instability in the geopolitical environment, including as a result of the Russian invasion of Ukraine, the rising tensions between China and Taiwan, the conflict in Israel and surrounding area and other political tensions.
We anticipate we will make determinations as to which programs to pursue and how much funding to direct to each program on an ongoing basis in response to our ability to maintain or enter into new strategic alliances with respect to each program or potential product candidate, the scientific and clinical success of each future product candidate, and ongoing assessments as to each future product candidate’s commercial potential.
We anticipate we 94 will make determinations as to which programs to pursue and how much funding to direct to each program on an ongoing basis in response to our ability to maintain or enter into new strategic alliances with respect to each program or potential product candidate, the scientific and clinical success of each future product candidate, and ongoing assessments as to each future product candidate’s commercial potential.
Should additional capital not be available to us in the near term, or not be available on acceptable terms, we may be unable to realize value from our assets and discharge our 88 liabilities in the normal course of business, which may, among other alternatives, cause us to further delay, substantially reduce, or discontinue operational activities to conserve our cash resources.
Should additional capital not be available to us in the near term, or not be available on acceptable terms, we may be unable to realize value from our assets and discharge our liabilities in the normal course of business, which may, among other alternatives, cause us to further delay, substantially reduce, or discontinue operational activities to conserve our cash resources.
Under the terms of the Zenas Agreements, we granted Zenas BioPharma an exclusive license to develop, manufacture, and commercialize certain IGF-1R directed antibody products for non-oncology indications in the greater area of China in exchange for upfront non-cash consideration and non-refundable milestone payments upon achieving specific milestone events during the contract term.
Under the Zenas Agreements, we granted Zenas BioPharma an exclusive license to develop, manufacture, and commercialize certain IGF-1R directed antibody products for non-oncology indications in the greater area of China in exchange for upfront non-cash consideration and non-refundable milestone payments upon achieving specific milestone events during the contract term.
During the year ended December 31, 2023, the Company sold 684,298 shares under 89 the September 2022 ATM Agreement with Jefferies at a weighted average price of $22.30 per share, for aggregate net proceeds of approximately $14.8 million, including commissions to Jefferies as a sales agent.
During the year ended December 31, 2023, the Company sold 684,298 shares under the September 2022 ATM Agreement with Jefferies at a weighted average price of $22.30 per share, for aggregate net proceeds of approximately $14.8 million, including commissions to Jefferies as a sales agent.
Substantially all of our operating losses resulted from expenses incurred in connection with our research and development programs and from general and administrative costs associated with our operations.
Substantially all of our operating losses resulted from expenses incurred in connection with our research and development programs and from selling, general and administrative costs associated with our operations.
Our material cash requirements include obligations as of December 31, 2024, as well as resources required to fulfill our research and development activities and the effects that such obligations and activities are expected to have on our liquidity and cash flows in future periods.
Our material cash requirements include obligations as of December 31, 2025, as well as resources required to fulfill our research and development activities and the effects that such obligations and activities are expected to have on our liquidity and cash flows in future periods.
General and Administrative Expenses General and administrative expenses consist primarily of salaries and related benefits, including share-based compensation, and severance and retention benefits related to our finance, accounting, human resources, legal, business development, and other support functions, professional fees for auditing, tax, and legal services, market research and other professional and consulting fees to prepare for commercial activities, as well as insurance, board of director compensation, consulting, and other administrative expenses.
Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of salaries and related benefits, including share-based compensation, and severance and retention benefits related to our executive, commercial, finance, human resources, legal, business development, and other support functions, professional fees for auditing, tax, and legal services, market research and other professional and consulting fees to prepare for commercial activities, as well as insurance, board of director compensation, consulting, and other administrative expenses.
During the year ended December 31, 2024, 3,058,751 shares were sold under the September 2022 ATM Agreement at a weighted average price of $22.86 per share, for aggregate net proceeds of approximately $67.7 million, including commissions to Jefferies as a sales agent.
During the year ended December 31, 2024, the Company sold 3,058,751 shares under the September 2022 ATM Agreement with Jefferies at a weighted average price of $22.86 per share, for aggregate net proceeds of approximately $67.7 million, including commissions to Jefferies as a sales agent.
This five-dose veligrotug regimen features fewer infusions and a shorter time per infusion compared to teprotumumab, the currently marketed IGF-1R inhibitor. On September 10, 2024, we announced topline data from the THRIVE study, which enrolled 113 patients, randomized to veligrotug (n=75) and placebo (n=38).
This five-dose veligrotug regimen features fewer infusions and a shorter time per infusion compared to teprotumumab, the currently marketed IGF-1R inhibitor. In September 2024, we announced topline data from the THRIVE study, which enrolled 113 patients, randomized to veligrotug (n=75) and placebo (n=38).
VRDN-003 is designed to be a low-volume, infrequently-dosed subcutaneous IGF-1R for TED, which we plan to launch commercially with an auto-injector to enable at-home patient self-administration. We believe VRDN-003 has the potential to be the best-in-class subcutaneous anti-IGF-1R product candidate by preserving the efficacy of anti-IGF-1Rs in TED, improving safety and maximizing convenience for patients.
Elegrobart is designed to be a low-volume, infrequently-dosed subcutaneous IGF-1R for TED, which we plan to launch commercially with an auto-injector to enable at-home patient self-administration. We believe elegrobart has the potential to be the best-in-class anti-IGF-1R product candidate by preserving the efficacy of anti-IGF-1Rs in TED, improving safety, and maximizing convenience for patients with subcutaneous delivery.
In previously presented in vitro nonclinical data, we showed that veligrotug is a potentially differentiated full antagonist of IGF-1R, compared to teprotumumab’s incomplete antagonism of IGF-1R. VRDN-003 has the same binding domain as veligrotug, and was engineered to have a longer half-life.
In previously presented in vitro nonclinical data, we showed that veligrotug is a potentially differentiated full antagonist of IGF-1R, compared to teprotumumab’s incomplete antagonism of IGF-1R. Elegrobart has the same binding domain as veligrotug, and was engineered to have a longer half-life.
We record up-front and milestone payments to acquire and retain contractual rights to in-licensed technology and intellectual property rights as research and development expenses when incurred if there is uncertainty in our receiving future economic benefit from the acquired contractual rights.
We record upfront and milestone payments to acquire and retain contractual rights to in-licensed technology and intellectual property rights as research and development expenses when incurred if there is uncertainty in our receiving future economic benefit from the acquired contractual rights.
Loan and Security Agreement with Hercules Capital, Inc. On April 1, 2022, we entered into the Hercules Loan and Security Agreement among the Company, certain of our subsidiaries from time to time party thereto (together with the Company, collectively, the “Borrower”), Hercules and certain other lenders party thereto (the “Lenders”).
Loan and Security Agreement with Hercules Capital, Inc. In April 2022, we entered into the Hercules Loan and Security Agreement among the Company, certain of our subsidiaries from time to time party thereto (together with the Company, collectively, the “Borrower”), Hercules and certain other lenders party thereto (the “Lenders”).
LLC and Stifel, Nicolaus & Company, Incorporated related to the offer and sale (the “September 2024 Public Offering”) of 12,466,600 shares of our common stock, which includes 1,800,000 shares of common stock issued in connection with the exercise in full by the underwriters of their option to purchase additional shares at a public offering price of $18.75 per share, and 20,000 shares of our Series B Convertible Preferred Stock at a price per share of $1,250.0625 per share.
LLC and Stifel, Nicolaus & Company, Incorporated related to the offer and sale of 12,466,600 shares of our common stock, which includes 1,800,000 shares of common stock issued in connection with the exercise in full by the underwriters of their option to purchase additional shares at a public offering price of $18.75 per share, and 20,000 shares of our Series B Convertible Preferred Stock at a price per share of $1,250.06 per share.
In January 2024, we entered into an underwriting agreement with Jefferies LLC (“Jefferies”) and Leerink Partners LLC relating to the offer and sale (the “January 2024 Public Offering”) of 7,142,858 shares of our common stock at a public offering price of $21.00 per share.
Public Offerings In January 2024, we entered into an underwriting agreement with Jefferies and Leerink Partners LLC relating to the offer and sale of 7,142,858 shares of our common stock at a public offering price of $21.00 per share.
We are conducting a global pivotal program for veligrotug, including evaluating its efficacy and safety in two global well-controlled phase 3 clinical trials, THRIVE and THRIVE-2, for the treatment of active and chronic TED, respectively. THRIVE and THRIVE-2 are each designed to compare a five-dose IV treatment arm of veligrotug at 10 mg/kg, dosed three weeks apart, to placebo.
We conducted a global pivotal clinical program for veligrotug, evaluating its efficacy and safety in two global well-controlled phase 3 clinical trials, THRIVE and THRIVE-2, for the treatment of active and chronic TED, respectively. THRIVE and THRIVE-2 were each designed to compare a five-dose IV treatment arm of veligrotug at 10 mg/kg, dosed three weeks apart, to placebo.
Financial Operations Overview Revenue Our revenue has historically consisted primarily of up-front payments for licenses, milestone payments, and payments for other research and development services earned under license and collaboration agreements as well as for amounts earned under certain grants we have been awarded. In October 2020, we became party to a license agreement with Zenas BioPharma.
Financial Operations Overview Revenue Our revenue has historically consisted primarily of up-front payments for licenses, milestone payments, and payments for other research and development services earned under license and collaboration agreements as well as for amounts earned under certain grants we have been awarded. In October 2020, we entered into a license agreement with Zenas BioPharma.
Discussions of the year ended December 31, 2022 and year-to-year comparisons between the years ended December 31, 2023 and 2022 have been excluded from this Form 10-K and can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 27, 2024.
Discussions of the year ended December 31, 2023 and year-to-year comparisons between the years ended December 31, 2024 and 2023 have been excluded from this Form 10-K and can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on March 3, 2025.
This section discusses 2024 and 2023 items and year-to-year comparisons between the years ended December 31, 2024 and 2023.
This section discusses 2025 and 2024 items and year-to-year comparisons between the years ended December 31, 2025 and 2024.
We are conducting a global pivotal program for VRDN-003, including evaluating its efficacy and safety in two global well-controlled phase 3 clinical trials, REVEAL-1 and REVEAL-2, for the treatment of active and chronic TED, respectively. Both studies will evaluate subcutaneous VRDN-003 administered every four weeks or every eight weeks and will assess outcomes versus placebo.
We are conducting a global pivotal program for elegrobart, including evaluating its efficacy and safety in two global well-controlled phase 3 clinical trials, REVEAL-1 and REVEAL-2, for the treatment of active and chronic TED, respectively. Both studies are evaluating elegrobart administered subcutaneously every four weeks or every eight weeks and will assess outcomes versus placebo.
In the future, we expect to continue to generate revenue from a combination of license fees and other up-front payments, payments for research and development services, milestone payments, product sales, and royalties in connection with strategic alliances.
In the future, we expect to continue to generate revenue from a combination of license fees and other upfront payments, payments for research and development services, milestone payments, product sales, and royalties in connection with strategic alliances and from customers.
We will need to raise additional capital and may seek additional strategic alliances in the future in order to advance the various clinical trials that are part of our clinical development program described above.
We may need to secure additional capital and could seek additional strategic alliances in the future in order to advance the various clinical trials that are part of our clinical development program described above.
Our operating lease obligations primarily consist of lease payments on our office space in Waltham, Massachusetts and our lab and office facilities in Boulder, Colorado. For additional information regarding our lease obligations, see Note 8 to our condensed consolidated financial statements included elsewhere in this report.
Our operating lease obligations primarily consist of lease payments on our office space in Waltham, Massachusetts and our lab and office facilities in Boulder, Colorado. For additional information regarding our lease obligations, see Note 9, Commitments and Contingencies, to our consolidated financial statements included elsewhere in this report.
The aggregate gross proceeds to us from the September 2024 Public Offering, including the exercise of the option, were approximately $258.8 million, before deducting underwriting discounts and commissions and other offering expenses payable by us.
The aggregate gross proceeds to us, including the exercise of the option, were approximately $258.8 million, before deducting underwriting discounts and commissions and other offering expenses payable by us.
As of December 31, 2024, we were unable to estimate the timing or likelihood of achieving the milestones or making future product sales. For additional information regarding our agreements, see Note 7 and Note 8 to our condensed consolidated financial statements included elsewhere in this report.
As of December 31, 2025, we were unable to estimate the timing or likelihood of achieving the milestones or making future product sales. For additional information regarding our agreements, see Note 8, Collaboration and License Agreements, to our consolidated financial statements included elsewhere in this report.
The Amended Term Loan bears interest at a floating per annum rate equal to the greater of (i) 7.45% and (ii) 4.2% above the Prime Rate (as defined therein), provided that the Term Loan interest rate shall not exceed a per annum rate of 8.95%. Interest is payable monthly in arrears on the first day of each month.
The amended term loan facility bears interest at a floating per annum rate equal to the greater of 8.95% and 1.45% above the Prime Rate (as defined therein), provided that the interest rate shall not exceed a per annum rate of 9.45%. Interest is payable monthly in arrears on the first day of each month.
Development of Therapies to Treat Thyroid Eye Disease (TED) We are developing two product candidates, veligrotug (formerly known as VRDN-001) for intravenous and VRDN-003 for subcutaneous administration, to treat patients who suffer from TED. Our most advanced program, veligrotug, is a differentiated humanized monoclonal antibody targeting IGF-1R intravenously administered for the treatment of TED.
We are developing two anti-IGF-1R product candidates, veligrotug for intravenous (“IV”) administration and elegrobart (formerly known as VRDN-003) for subcutaneous (“SC”) administration, to treat patients who suffer from TED. Our most advanced program, veligrotug, is a differentiated humanized monoclonal antibody targeting IGF-1R intravenously administered for the treatment of TED.
We were required to repay the Term Loan amount in equal monthly installments of the principal amount and interest between the end of the interest-only period and the maturity date of October 1, 2026.
We are required to repay the outstanding amount of the term loan facility in equal monthly installments of the principal amount and interest between the end of the interest-only period and the maturity date of October 1, 2030.
Zenas BioPharma announced that it had obtained IND approval in China in July 2022. Under the license agreement, we received a $1.0 million milestone payment from Zenas BioPharma. Additionally, we are eligible to receive royalty payments based on a percentage of the annual net sales of any licensed products sold on a country-by-country basis in the greater area of China.
In July 2022, Zenas BioPharma announced that it had obtained IND approval in China. Additionally, we are eligible to receive royalty payments based on a percentage of the annual net sales of any licensed products sold on a country-by-country basis in the greater area of China throughout the royalty term.
In our head-to-head NHP studies, VRDN-006 demonstrated comparable potency and IgG reductions to efgartigimod, which is the current standard of care in FcRn inhibition, as well as a similar safety profile.
In our head-to-head NHP studies, VRDN-006 demonstrated comparable potency and IgG reductions to efgartigimod, which is the current standard of care in FcRn inhibition, as well as a similar safety profile. We submitted an IND for VRDN-006 in December 2024, which cleared in January 2025.
Overview We are a biopharmaceutical company focused on discovering, developing and commercializing potential best-in-class medicines for serious and rare diseases. We target disease areas where marketed therapies often leave room for improvements in efficacy, safety, and/or dosing convenience.
Overview and Recent Developments We are a biopharmaceutical company focused on discovering, developing, and commercializing potential best-in-class medicines for serious and rare diseases. We target therapeutic areas in which current treatments leave room for improvements in efficacy, safety, and/or dosing convenience.
ATM Agreement In September 2022, we entered into the September 2022 ATM Agreement with Jefferies pursuant to which we may offer and sell shares of our common stock having an aggregate offering price of up to $175.0 million from time to time at prices and on terms to be determined by market conditions at the time of offering, with Jefferies acting as the sales agent.
In March 2025, the Company entered into an Open Market Sale Agreement SM (the “March 2025 ATM Agreement”) with Jefferies, pursuant to which the Company may offer and sell shares of its common stock having an aggregate offering price of up to $300.0 million from time to time at prices and on terms to be determined by market conditions at the time of offering, with Jefferies acting as its sales agent.
We believe that the accounting policy discussed below is critical to understanding our historical and future performance, as this policy relates to the more significant areas involving our judgments and estimates.
We believe that the accounting policies discussed below are critical to understanding our historical and future performance, as these policies relate to the more significant areas involving our judgments and estimates.
Under the Hercules Amendment, the Lenders provided the Company access to an increased term loan with an aggregate principal amount of up to $150 million, in four tranches (collectively the “Amended Term Loan”), consisting of (1) an initial tranche of $50.0 million, $5.0 million of which was drawn at closing of the Hercules Loan and Security Agreement in April 2022, $15.0 million of which was drawn at closing of the Hercules Amendment in August 2023, $5.0 million of which was available through December 15, 2023, and $25.0 million of which was available from July 1, 2024 through December 15, 2024; (2) a second tranche of $20.0 million, subject to achievement of certain regulatory milestones, available through February 15, 2025; (3) a third tranche of $20.0 million, subject to achievement of certain regulatory milestones, available through March 31, 2025; and (4) a fourth tranche of $60.0 million subject to approval by the Lenders’ investment committee(s), available through June 15, 2025.
Under the Hercules First Amendment, the maturity date was extended to October 1, 2026 and the Lenders provided the Borrower access to an increased term loan with an aggregate principal amount of up to $150 million, in four tranches, consisting of (i) an initial tranche of $50.0 million, $25.0 million of which was available through December 15, 2023, and $25.0 million of which was available from July 1, 2024 through December 15, 2024; (ii) a second tranche of $20.0 million, subject to achievement of certain regulatory milestones, which was available through February 15, 2025; (iii) a third tranche of $20.0 million, subject to achievement of certain regulatory milestones, which was available through March 31, 2025; and (iv) a fourth tranche of $60.0 million subject to approval by the Lenders’ investment committee(s), which was available through June 15, 2025.
The change in working capital was primarily related to a decrease of $7.0 million 90 in accounts payable and accrued and other liabilities and an increase of $2.1 million in prepaid expenses and other current assets due to the timing of payments and prepayments to vendors for ongoing clinical trial and manufacturing activities.
The change in working capital was primarily related to an increase of $22.8 million in accounts payable, accrued liabilities and other liabilities due to the timing of payments and prepayments to vendors for ongoing clinical trial and manufacturing activities.
During the year ended December 31, 2022, 964,357 shares were sold under the September 2022 ATM Agreement at a weighted average price of $26.01 per share, for aggregate net proceeds of approximately $24.2 million, including commissions to Jefferies as a sales agent.
During the year ended December 31, 2025, the Company sold 245,388 shares under the September 2022 ATM Agreement at a weighted average price of $20.14 per share, for aggregate net proceeds of approximately $4.8 million, including commissions to Jefferies as a sales agent.
Upon signing, we drew an initial principal amount of $5.0 million. Per the terms of the Hercules Loan and Security Agreement, we were originally obligated to make interest-only payments through April 1, 2024, which was extended to October 1, 2024 upon the achievement of a development milestone in August 2022.
Per the terms of the Hercules Loan and Security Agreement, we were originally obligated to make interest-only payments through April 1, 2024, which was extended to October 1, 2024 upon the achievement of a development milestone in August 2022. 98 In August 2023, we executed the first amendment to the Hercules Loan and Security Agreement (the “Hercules First Amendment”).
Summarized cash flows for the year ended December 31, 2024 and 2023 are as follows: Year Ended December 31, 2024 2023 (in thousands) Net cash provided by (used in): Operating activities $ (232,319) $ (184,170) Investing activities (228,651) (94,252) Financing activities 457,737 225,670 Total $ (3,233) $ (52,752) Operating Activities Net cash used in operating activities was $232.3 million for the year ended December 31, 2024, and primarily consisted of a net loss of $269.9 million, adjusted for non-cash items of $28.0 million, including share-based compensation of $42.2 million partially offset by accretion and amortization of premiums and discounts on available-for-sale securities of $15.7 million, and working capital adjustments of $9.6 million.
Net cash used in operating activities was $232.3 million for the year ended December 31, 2024, and primarily consisted of a net loss of $269.9 million, adjusted for non-cash items of $28.0 million, including share-based compensation of $42.2 million, partially offset by accretion and amortization of premiums and discounts on available-for-sale securities of $15.7 million, and working capital adjustments of $9.6 million.
In August 2023, we executed an amendment to the Hercules Loan and Security Agreement (the “Hercules Amendment”). The Hercules Amendment was determined to substantially alter the Hercules Loan and Security Agreement and therefore was accounted for as a debt extinguishment.
The Hercules First Amendment was determined to substantially alter the Hercules Loan and Security Agreement and therefore was accounted for as a debt extinguishment.
Under the Hercules Loan and Security Agreement, the Lenders provided us with access to a term loan with an aggregate principal amount of up to $75.0 million, in four tranches (collectively the “Term Loan”), including an initial tranche of $25.0 million, which was available to us through June 15, 2023.
Under the Hercules Loan and Security Agreement, the Lenders provided us with access to a term loan with an aggregate principal amount of up to $75.0 million, in four tranches, including an initial tranche of $25.0 million. Upon signing, we drew an initial principal amount of $5.0 million.
Since February 2021, we have entered into several letter agreements with Zenas BioPharma in which we agreed to provide assistance to Zenas BioPharma with certain development activities, including manufacturing (collectively with the license agreement, the “Zenas Agreements”).
Subsequently, we entered into several letter agreements to assist Zenas BioPharma with certain development activities, including manufacturing (collectively with the license agreement, the “Zenas Agreements”).
Investing Activities Net cash used in investing activities was $228.7 million during the year ended December 31, 2024. Net cash used in investing activities in 2024 primarily consisted of net purchases of investments of $228.1 million and property and equipment purchases of $0.5 million. Net cash used in investing activities was $94.3 million during the year ended December 31, 2023.
Investing Activities Net cash used in investing activities was $37.6 million during the year ended December 31, 2025 and primarily consisted of $37.1 million in net purchases of marketable securities. Net cash used in investing activities was $228.7 million during the year ended December 31, 2024 and primarily consisted of $228.1 million in net purchases of marketable securities.
In May 2022, we entered into a Manufacturing Development and Supply Agreement with Zenas BioPharma to manufacture and supply, or have manufactured and supplied, clinical drug product for development purposes.
The royalty percentage may vary based on different tiers of annual net sales of the licensed products made. In May 2022, we entered into a manufacturing development and supply agreement with Zenas BioPharma to manufacture and supply, or have manufactured and supplied, clinical drug product for development purposes.
During the quarter ended December 31, 2024, the Company sold 1,497,181 shares under the September 2022 ATM Agreement with Jefferies at a weighted average price of $22.47 per share, for aggregate net proceeds of approximately $32.6 million, including commissions to Jefferies as a sales agent.
During the year ended December 31, 2025, the Company sold 1,971,476 shares under the March 2025 ATM Agreement at a weighted average price of $29.52 per share, for aggregate net proceeds of approximately $57.0 million, including commissions to Jefferies as a sales agent.
FcRn inhibitors have the potential to treat a broad array of autoimmune diseases, representing a possible significant commercial market opportunity.
Development of FcRn Inhibitors We are also developing a portfolio of engineered FcRn inhibitors, including VRDN-006 and VRDN-008. FcRn inhibitors have the potential to treat a broad array of autoimmune diseases, representing a possible significant commercial market opportunity.
The aggregate gross proceeds to us from the January 2024 Public Offering were approximately $150.0 million, before deducting underwriting discounts and commissions and other offering expenses payable by us.
The aggregate gross proceeds to us were approximately $150.0 million, before deducting underwriting discounts and commissions and other offering expenses payable by us. In September 2024, we entered into an underwriting agreement with Jefferies, Goldman Sachs & Co.
Clinical Trial and Nonclinical Study Accruals We make estimates of our accrued expenses as of each balance sheet date in our consolidated financial statements based on certain facts and circumstances at that time.
The derivative liability is remeasured each reporting period with any change in fair value recorded in other expense, net on the consolidated statements of operations and comprehensive loss. 95 Clinical Trial and Nonclinical Study Accruals We make estimates of our accrued expenses as of each balance sheet date in our consolidated financial statements based on certain facts and circumstances at that time.
Net cash provided by financing activities in 2024 was primarily driven by net proceeds of $451.7 million from the 2024 Public Offerings and the September 2022 ATM Agreement, as well as $5.3 million in proceeds from the exercise of stock options and $0.7 million in proceeds from the issuance of common stock under our employee stock purchase plan.
Net cash provided by financing activities was $457.7 million for the year ended December 31, 2024, and consisted primarily of net proceeds of $451.7 million from the issuance of common and preferred stock in our public offerings and at-the-market offerings, as well as $5.3 million in proceeds from the exercise of stock options.
Other Income, net Other income, net consists primarily of interest income, net of fees, and various income items of a non-recurring nature. Interest expense consists of cash and non-cash interest expense on our long-term debt. We earn interest income from interest-bearing accounts, money market funds, and short-term investments.
Other Income (Expense), net Other income (expense), net consists primarily of interest income, interest expense and various items of a non-recurring nature. We earn interest income from interest-bearing accounts, money market funds and marketable securities. Interest expense consists of cash and non-cash interest expense related to our DRI Purchase and Sale Agreement and Hercules Loan and Security Agreement.
The increase in interest income is primarily attributable to higher interest rates and higher average short-term investments balances during the year ended December 31, 2024 as compared to the year ended December 31, 2023. 87 Liquidity and Capital Resources We have funded our operations to date principally through proceeds received from the sale of our common stock, our Series A Convertible Preferred Stock, our Series B Convertible Preferred Stock and other equity securities, debt financings, license fees, and reimbursements received under collaboration agreements.
Additional Capital Resources We have funded our operations to date principally through proceeds received from the sale of our common stock, our Series A convertible preferred stock, our Series B convertible preferred stock and other equity securities, debt financings, license fees, and reimbursements received under collaboration agreements.
In addition to our intravenous veligrotug program, VRDN-003 is our subcutaneous product candidate currently in pivotal development in TED, which we selected in December 2023 following positive data in a phase 1 clinical trial in healthy volunteers.
We are also developing elegrobart, our subcutaneous anti-IGF-1R product candidate currently in pivotal clinical studies in TED, which we selected in December 2023 following positive data in a phase 1 clinical trial in healthy volunteers.
Our accrued expenses for nonclinical studies and clinical trials are based on estimates of costs incurred for services provided by external service providers and for other trial-related activities.
Our accrued expenses for nonclinical studies and clinical trials are based on estimates of costs incurred for services provided by external service providers and for other trial-related activities. The timing and amount of expenses we incur through our external service providers depend on a number of factors, such as site initiation, patient screening, enrollment, delivery of reports, and other events.
THRIVE achieved all primary and secondary endpoints with a high level of statistical significance (p 82 requirements for the veligrotug biologics license application (“BLA”), we are conducting our STRIVE clinical trial (safety database inclusive of patients from the THRIVE and THRIVE-2 trials).
THRIVE achieved its primary and all secondary endpoints with a high level of statistical significance (p 91 To meet the 300 patient safety database requirement for the veligrotug BLA, we are conducting STRIVE, a global phase 3 clinical trial.
We believe that first-generation medicines rarely represent optimal solutions, especially in rare disease areas, and that there is potential to develop differentiated, best-in-class medicines that could lead to improved patient outcomes, reduced side effects, improved quality of life, expanded market access, and augmented market competition.
We aim to develop differentiated, potential best-in-class medicines that could lead to improved patient outcomes, reduced side effects, improved quality of life, and expanded market access. 90 Our pipeline targets validated pathways and disease-driving mechanisms in autoimmune and rare diseases.
STRIVE is a global study of veligrotug in TED patients that utilizes broad inclusion criteria (e.g., any severity or duration of disease) and is randomized 3:1 (10 mg/kg IV with an active control of 3 mg/kg IV).
STRIVE enrolled 231 TED patients, utilized broad inclusion criteria (e.g., any severity or duration of disease), and randomized patients 3:1 (10 mg/kg IV with an active control of 3 mg/kg IV). We are also conducting an open label extension study for non-responding patients in THRIVE and THRIVE-2 which has completed enrollment.
In addition, as of December 31, 2024, the Company has access to additional undrawn funds under the Hercules Amended Term Loan, as described below. We have no products approved for commercial sale and have not generated any revenue from product sales. Since our inception and through December 31, 2024, we have generated an accumulated deficit of $995.9 million.
We have no products approved for commercial sale and have not generated any revenue from product sales. Since our inception and through December 31, 2025, we have generated an accumulated deficit of $1,338.5 million.
This approach informs how we design, select, and develop our product candidates, including in critical areas such as pharmacokinetics, pharmacodynamics, clinical trial design, trial endpoints, and the selection and recruitment of patients. We believe this strategy reduces the risks associated with discovering and developing novel therapeutics.
We bring potential improvements to critical areas such as molecular design, dose selection, pharmacokinetics, pharmacodynamics, clinical trial design, trial endpoints, and the selection and recruitment of patients. We believe this strategy enables efficient product development and reduces the risk when developing novel therapeutics.
In addition, the Borrower is required to pay an end-of-term fee equal to 6% of the principal amount of funded Amended Term Loan advances at maturity, which are being accreted as additional interest expense over the term of the loan.
In addition, we are required to pay an end-of-term fee equal to 4.25% of the principal amount of funded advances if the term loan facility is repaid on or prior to October 17, 2027 or 6.00% of the principal amount of funded advances at maturity if the term loan facility is repaid after October 17, 2027.
Patient enrollment and dosing continues in both studies. In addition, to enable BLA submission for VRDN-003, we have initiated a safety study to meet the 300 patient standard safety database requirement (to also include patients from the REVEAL-1 and REVEAL-2 trials) and plan to initiate an auto-injector study in 2025 to enable launching VRDN-003 in an auto-injector device, if approved.
In addition, to enable BLA submission for elegrobart, we are conducting a safety study to meet the 300 patient safety database requirement (to also include patients from the REVEAL-1 and REVEAL-2 trials). We completed enrollment of this safety study in October 2025, enrolling 321 patients, exceeding the target enrollment of 284 patients due to demand.
Other income, net for the year ended December 31, 2024 is comprised of $31.6 million of interest income earned on short-term investments as well as $0.3 million of sub-lease income, offset by $2.2 million in interest expense related to our Hercules Loan and Security Agreement, and $0.6 million in other losses.
Other Income, net Other income, net was $20.8 million during the year ended December 31, 2025 compared to $29.1 million during the year ended December 31, 2024, primarily comprised of interest income earned on marketable securities, partially offset by interest expense related to our DRI Purchase and Sale Agreement and Hercules Loan and Security Agreement.
Facility and other operating costs increased $1.9 million during the year ended December 31, 2024 compared to the year ended December 31, 2023, primarily attributable to an increase in professional services fees for consultants and contractors, as well as an increase in facility and information technology costs to support our ongoing research and development efforts.
Personnel-related costs increased $14.3 million during the year ended December 31, 2025 compared to the year ended December 31, 2024, primarily attributable to increased headcount to support our ongoing research and development efforts.
The interest rate as of December 31, 2024 was 8.95%. Per the terms of the Hercules Amendment, we were originally obligated to make interest-only payments through April 1, 2025. Upon achievement of certain development milestones related to our topline results for our phase 3 THRIVE trial in September 2024, the interest-only period was extended to October 1, 2025.
The interest rate as of December 31, 2025 was 8.95%. Under the Hercules Second Amendment, we are obligated to make interest-only payments through October 1, 2029. If certain regulatory milestones are met, then the interest-only period will be extended to October 1, 2030.
Additionally, VRDN-008 showed a deeper and more sustained IgG reduction with peak IgG reductions that were 20% deeper than efgartigimod while not showing decreases in albumin or increases in LDL levels. NHP studies are ongoing to generate additional data for VRDN-008.
Additionally, VRDN-008 showed a deeper and more sustained IgG reduction with peak IgG reductions that were 20% deeper than efgartigimod, and IgG levels returned to baseline 35 days after VRDN-008 dosing, more than twice as long as efgartigimod, which returned to baseline 14 days after dosing. VRDN-008 spared albumin and LDL, consistent with efgartigimod.
The VRDN-003 phase 1 clinical study showed VRDN-003 to have a prolonged half-life of 40 to 50 days, which is four to five times that of veligrotug.
In its phase 1 clinical study in healthy volunteers, elegrobart was shown to have a prolonged half-life of 40 to 50 days, which is four to five times that of veligrotug. Based on this data and the similarities between the veligrotug and elegrobart antibodies, we selected Q4W and Q8W dosing of elegrobart to advance to phase 3 pivotal studies.
Adjustments to our research and development expenses may be necessary in future periods as our estimates change.
In accruing for these activities, we obtain information from various sources and estimate the level of effort or expense allocated to each period. Adjustments to our research and development expenses may be necessary in future periods as our estimates change.
Net cash provided by financing activities in 2023 was primarily driven by net proceeds of $189.5 million from the 2023 Private Placement and the September 2022 ATM Agreement, as well as $19.3 million in proceeds from the exercise of stock options, $14.5 million in net proceeds from the Hercules Amendment, $1.9 million in proceeds from the exercise of warrants and $0.6 million in proceeds from the issuance of common stock under our employee stock purchase plan.
Financing Activities Net cash provided by financing activities was $426.7 million during the year ended December 31, 2025, and consisted primarily of net proceeds of $333.5 million from the issuance of common stock in our public offering and at-the-market offerings, net proceeds of $50.0 from the DRI Purchase and Sale Agreement, net proceeds of $28.4 from the Hercules Second Amendment, as well as $12.1 million in proceeds from the exercise of stock options.
As of December 31, 2024, the milestones for the second and third tranches have been achieved. The obligations of the Borrower under the Hercules Amendment agreement are secured by substantially all of the assets of the Borrower, excluding the Borrower’s intellectual property. The Amended Term Loan has a maturity date of October 1, 2026.
The milestones for Tranche 2, Tranche 3 and Tranche 4 have not yet been achieved. The obligations of the Borrower under the Hercules Second Amendment are secured by substantially all of the assets of the Borrower.
Direct costs related to the FcRn inhibitor portfolio increased by $12.0 million during the year ended December 31, 2024 compared to the year ended December 31, 2023, primarily attributable to: • $14.0 million increase in nonclinical research to advance the FcRn inhibitor portfolio; and • $14.0 million increase in chemistry, manufacturing and controls costs to support IND-enabling activities. 86 These increases were partially offset by a $16.3 million decrease in milestone, license and option fees as a result expenses incurred during the year ended December 31, 2023, primarily due to a $15.0 million upfront payment related to the development of subcutaneous delivery systems.
Direct costs related to other nonclinical research and development increased by $4.0 million during the year ended December 31, 2025 compared to the year ended December 31, 2024, primarily attributable to an increase in nonclinical research and chemistry, manufacturing and controls costs to support the development of the TSHR program.
Results of Operations Comparison of the Years Ended December 31, 2024 and 2023 Year Ended December 31, 2024 2023 Increase (Decrease) (in thousands) Revenue $ 302 $ 314 $ (12) Research and development expenses 238,254 159,765 78,489 General and administrative expenses 61,083 94,999 (33,916) Other income (expense), net 29,086 16,716 12,370 Net loss $ (269,949) $ (237,734) $ (32,215) Revenue Revenue was $0.3 million for the years ended December 31, 2024 and 2023.
Results of Operations Comparison of the Years Ended December 31, 2025 and 2024 Year Ended December 31, 2025 2024 Increase (Decrease) (in thousands) License revenue $ 70,000 $ — $ 70,000 Collaboration revenue - related parties 849 302 547 Research and development expenses 338,929 238,254 100,675 Selling, general and administrative expenses 95,315 61,083 34,232 Other income, net 20,794 29,086 (8,292) Net loss $ (342,601) $ (269,949) $ (72,652) Revenue License revenue for the year ended December 31, 2025 was attributable to the collaboration and license agreement with Kissei.
Revenue for both periods was attributable to our collaboration agreement with Zenas BioPharma.
Collaboration revenue - related parties for the years ended December 31, 2025 and 2024 was attributable to our collaboration agreement with Zenas BioPharma and the Side Agreement and MTA with Zai Lab.