Debt Obligations
Secured Promissory Note
On August 30, 2023, the Company and Nantahala Capital Management, LLC (“NCM”), certain of its affiliates and certain other parties (collectively with NCM, “Nantahala”), entered into a secured promissory note payable by Zevra to Nantahala in the original principal amount of $5.0 million (the “Nantahala Note”). The Nantahala Note initially bore interest at 9.0% per annum, payable quarterly in arrears in cash. The interest rate increased to 12.0% per annum effective March 1, 2024, as the Nantahala Note remained unpaid six months from its issue date. The additional 3.0% interest would have been paid in shares of Zevra's common stock based on the volume weighted average trading price of Zevra's common stock during the twenty consecutive trading days ending on the date before such interest payment date. Beginning on the first interest payment date following the second anniversary of the Nantahala Note, and on each interest payment date thereafter, Zevra was required to make $0.6 million amortization payments on the Nantahala Note until it was paid in full. All principal and unpaid interest on the Nantahala Note would have been due on August 30, 2026, the third anniversary of the Nantahala Note. Zevra was entitled to prepay the Nantahala Note at any time without penalty.
The Nantahala Note was secured by Zevra’s interest in Acer's assets. The Company used the proceeds from the Nantahala Note, along with $12.0 million in cash and 98,683 shares of Zevra's common stock, to acquire Acer's term loans. In April 2024, the Nantahala Note was repaid in full and terminated. At the time of repayment, Nantahala elected to receive a cash payment in lieu of shares of Zevra's common stock in exchange for the additional 3.0% interest accrued for the period from March 1, 2024 through April 5, 2024.
Margin Account
On January 26, 2023, the Company and Wells Fargo, as lender, entered into a revolving margin account agreement. The Company's investments were used as collateral for the loan and the amount the Company was able to borrow was limited to 80-90% of its outstanding investment balance held with Wells Fargo. The margin account bore interest at the Prime rate minus 225 basis-points. In April 2024, the Company repaid the outstanding balance under the margin account with Wells Fargo, and upon such repayment, the margin capabilities were removed from the account.
Term Loans
On April 5, 2024 (the “Term Loans Closing Date”), the Company entered into a credit agreement (the “Credit Agreement”) with HCR Stafford Fund II, L.P., HCR Potomac Fund II, L.P., and Perceptive Credit Holdings IV, LP (collectively, the “Lenders”), and Alter Domus (US) LLC, as administrative agent (the “Administrative Agent”).
Under the terms of the Credit Agreement, the Lenders provided a senior secured loan facility to the Company in the aggregate principal amount of $100.0 million, which is divided into three tranches as follows: (i) $60.0 million, which was funded in full on the Term Loans Closing Date; (ii) $20.0 million, which was available to the Company in up to two drawings, each in an amount not to exceed $10.0 million, at the Company’s option until October 5, 2025; and; (iii) $20.0 million, which was available to the Company upon approval by the FDA of the NDA for MIPLYFFA for the treatment of NPC, at the Company’s option until December 31, 2024 (collectively, the “Term Loans”). The Company did not draw down the amounts described in (ii) and (iii) above prior to their applicable expiration dates.
The principal amount of the Term Loans outstanding (the “Outstanding Principal Amount”) historically bore interest at a rate equal to 3-Month Term Secured Overnight Financing Rate (“SOFR”) plus 7.00% per annum. As the net product sales for the calendar year ending December 31, 2025 exceeded $100.0 million, the Outstanding Principal Amount will bear interest at 3-Month Term SOFR plus 6.00% per annum beginning on January 1, 2026. In all cases, the 3-Month Term SOFR rate is subject to a floor of 4.00% per annum. Interest is payable quarterly in arrears on the last day of each calendar quarter. The Company has the option to pay up to 25% of the interest in-kind beginning on the Term Loans Closing Date, through and including June 30, 2026. The Company has recognized approximately $3.1 million and $1.4 million of interest-in-kind as of December 31, 2025, and 2024, which is included in long-term debt in the consolidated balance sheets. The Term Loans will mature on the fifth anniversary of the Term Loans Closing Date. In connection with the Credit Agreement, the Company incurred approximately $2.2 million of costs, which primarily consisted of underwriting, legal and other professional fees, and are included as a reduction to the carrying amount of the related debt liability and are deferred and amortized over the remaining life of the financing using the effective interest method.
The Credit Agreement contains customary affirmative and negative covenants by the Company, which, among other things, will require the Company to provide certain financial reports to the Lenders within 60 days after the end of each of the first three fiscal quarters of each fiscal year and 105 days after the end of each fiscal year, meet certain minimum net product sales amounts, meet certain minimum liquidity, and limit the ability of the Company to, among other things, incur or guarantee additional indebtedness, conduct asset sales, incur liens, make dividends or distributions, conduct transactions with affiliates, and effect a consolidation or merger without consent. The obligations of the Company under the Credit Agreement may be accelerated upon customary events of default, including non-payment of principal, interest, fees and other amounts, covenant defaults, insolvency, material judgments, or inaccuracy of representations and warranties. The Term Loans are secured by a first priority perfected lien on, and security interest in, substantially all current and future assets of the Company and certain subsidiaries of the Company that are guarantors thereunder. The proceeds of the Term Loans were used to refinance certain existing indebtedness of the Company and its subsidiaries. The Company will use the remaining proceeds to pay fees and expenses related to the debt financing and commercialization of MIPLYFFA and OLPRUVA, and to further the development of its other product candidates.
Long-term debt consisted of the following (in thousands):
December 31,
2025
December 31,
2024
Notes payable$63,608 $61,552 
Unamortized original issue discount(755)(921)
Less: debt issuance costs(925)(1,127)
$61,928 $59,504 
Future minimum principal payments under the Term Loans as of December 31, 2025, are as follows (in thousands):
Year Ending December 31,
2026$— 
2027— 
2028— 
202963,608 
Total minimum payments63,608 
Less: unamortized debt discount, debt issuance costs and paid in kind interest(1,680)
Long-term debt$61,928 

Historical Timeline

Fiscal YearFiled
2025Mar 9, 2026Showing above
2024Mar 12, 2025
2023Apr 1, 2024
2022Mar 7, 2023
2021Mar 31, 2022
2020Mar 12, 2021
2019Feb 28, 2020
2018Mar 1, 2019
2017Mar 30, 2018
2016Mar 10, 2017
2015Mar 16, 2016

About Debt Disclosures

Debt disclosures detail a company's borrowing structure — the types of instruments, interest rates, maturity schedule, and covenant restrictions that define its financial obligations and flexibility. This section is essential for assessing refinancing risk, interest rate exposure, and the margin of safety against financial distress.

Key signals: the maturity schedule reveals concentration risk — large maturities within 1-2 years during tight credit markets can force dilutive refinancing or asset sales. Compare the fair value of debt against carrying amount to gauge whether the market views the company's credit risk differently than the balance sheet suggests. Watch covenant compliance disclosures for tightening cushions, especially leverage and interest coverage ratios. Variable-rate debt exposure quantifies sensitivity to interest rate changes. Secured versus unsecured mix affects recovery rates and future borrowing capacity. Compare net debt-to-EBITDA against industry peers and covenant limits to assess financial health.