15. Corporate Line of Credit, Pre-Closing Bridge Notes and Convertible Notes
Corporate Line of Credit—The Company made the final principal payment on its corporate line of credit in August 2023 and as such incurred no interest expense under the corporate line of credit during the year ended December 31, 2024.
For the year ended December 31, 2023, the Company recorded a total of $17.5 million related to interest expense as follows: $11.5 million in interest expense related to the line of credit and $6.0 million in interest expense related to the amortization of deferred debt issuance costs and discount and other debt servicing fees which is included in interest and amortization on non-funding debt expense within the consolidated statements of operations and comprehensive loss.
Pre-Closing Bridge Notes— In connection with the Closing of the Business Combination, the Pre-Closing Bridge Notes held by SB Northstar in an aggregate principal amount of $650.0 million automatically converted into Class C common stock at a conversion price of $500.00 per share, adjusted by the 1-for-50 reverse stock split, (and the Pre-Closing Bridge Notes held by the Sponsor in an aggregate principal amount of $100.0 million were exchanged for 0.8 million shares of Class A common stock.
For the year ended December 31, 2023, the Company recorded a loss of $236.6 million of changes in fair value of embedded derivatives included in other expenses/(income), within the consolidated statements of operations and comprehensive loss.
Convertible Note—In connection with the Closing of the Business Combination, the Company issued to SB Northstar LP, a related party, a Cayman Islands exempted limited partnership, and an affiliate of SoftBank Group Corp., a senior subordinated convertible note in the aggregate principal amount of $528.6 million (the “Convertible Note”), $550.0 million less approximately $21.4 million released to the Company at the Closing from Aurora’s trust account, pursuant to an Indenture, dated as of August 22, 2023 (the “Indenture”). The Convertible Note bears 1% interest per annum and matures on August 22, 2028, unless earlier converted or redeemed. Per the Indenture, the Company may elect to pay all or any portion of interest in kind by issuing to the holder of such note an additional note or in cash. The counter parties to the Convertible Note and Merger Agreement are related parties.
The Convertible Note is convertible, at the option of SB Northstar, into shares of the Company’s Class A common stock, with an initial conversion rate per $1,000 principal amount of Convertible Note equal to (a) $1,000 divided by (b) a dollar amount equal to 115% of the First Anniversary VWAP (as defined in the Indenture), subject to adjustments as described therein. The Indenture provides that the First Anniversary VWAP may be no less than $400.00 and no greater than $600.00, adjusted by the 1-for-50 reverse stock split, subject to adjustments as described therein. The Convertible Note may be redeemed at the option of the Company at a redemption price of 115% of par plus accrued interest in cash, at any time on or before the 30th trading day prior to the maturity date of the Convertible Note if the last reported sale price of the Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days during the 30 trading day period ending on, and including, the trading day immediately preceding the date of notice of optional redemption. The Convertible Note is redeemable prior to maturity in the event of a fundamental change under the Indenture, such as the removal of the Company’s Class A common stock from the Nasdaq. In this event, the Company would be required to redeem the Convertible Note for an amount in cash equal to the principal balance plus accrued and unpaid interest on the redemption date.
As of December 31, 2024 and 2023, the carrying amount of the Convertible Note was $519.7 million and $514.6 million on the consolidated balance sheets, respectively. For the years ended December 31, 2024 and 2023, the Company recorded a total of $7.6 million and $2.2 million, respectively, of interest expense related to the Convertible Note. Interest expense from the Convertible Note is included in interest expense within the consolidated statements of operations and comprehensive loss. In February 2024, the Company made a cash payment in the amount of $2.5 million, which consisted of $1.1 million towards the principal and $1.4 million of interest from January 1, 2024 through February 15, 2024. For the period February 16, 2024 to December 31, 2024, the Company has elected to pay interest in kind on the Convertible Note, which is calculated at 1% per annum and accrued at the fair value of the additional note issued.

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.