In January 2020, the Issuers issued an additional $600 million in aggregate principal amount of the New 2024 Notes and an additional $250 million in aggregate principal amount of the New 2027 Notes. The additional proceeds from the New Notes, together with cash on hand, were used to redeem all of our prior outstanding $1.35 billion principal amount of 5.875% senior unsecured notes due 2022, and to pay accrued interest, related fees and expenses.
Each of our senior unsecured notes and the related guarantees are the senior unsecured obligations of the Issuers and rank equally with all of the Issuers’ and the Guarantor’s existing and future senior unsecured indebtedness and senior to all of the Issuers’ and the Guarantor’s existing and future subordinated indebtedness. Each of our senior unsecured notes and the related guarantees are effectively subordinated to the Issuers’ and the Guarantor’s existing and future secured indebtedness to the extent of the collateral securing such indebtedness. Each of our senior unsecured notes and the related guarantees are also effectively subordinated to all indebtedness and other liabilities of the Issuers’ subsidiaries other than the Guarantor.
The indentures governing our senior unsecured notes described above restrict the payment of cash distributions, the purchase of equity interests or the purchase, redemption, defeasance or acquisition of debt subordinated to the senior unsecured notes. The indentures also restrict the incurrence of debt or the issuance of disqualified stock, as defined in the indentures, with certain exceptions. In addition, the indentures require that on each quarterly determination date, Icahn Enterprises and the guarantor of the notes (currently only Icahn Enterprises Holdings) maintain certain minimum financial ratios, as defined therein. The indentures also restrict the creation of liens, mergers, consolidations and sales of substantially all of our assets, and transactions with affiliates. Additionally, each of the senior unsecured notes outstanding as of June 30, 2020, except for the New 2024 Notes and the New 2027 Notes, are subject to optional redemption premiums in the event we redeem any of the notes prior to certain dates as described in the indentures.
As of June 30, 2020 and December 31, 2019, we were in compliance with all covenants, including maintaining certain minimum financial ratios, as defined in the indentures. Additionally, as of June 30, 2020, based on covenants in the indentures governing our senior unsecured notes, we are not permitted to incur additional indebtedness.
2019 At-The-Market Offering
On May 2, 2019, Icahn Enterprises announced the commencement of its “at-the-market” offering pursuant to its Open Market Sale Agreement, pursuant to which Icahn Enterprises may sell its depositary units, from time to time, during the term of the program ending on March 31, 2021, for up to $400 million in aggregate sale proceeds. During the six months ended June 30, 2020, Icahn Enterprises sold 481,244 depositary units pursuant to this agreement, resulting in gross proceeds of $26 million. As of June 30, 2020, Icahn Enterprises may sell its depositary units for up to an additional $320 million in aggregate sale proceeds pursuant to this agreement. No assurance can be made that any or all amounts will be sold during the term of the program.
LP Unit Distributions
During the six months ended June 30, 2020, we declared two quarterly distributions aggregating $4.00 per depositary unit. In connection with these distributions, aggregate cash distributions to all depositary unitholders was $452 million, primarily due to Mr. Icahn and his affiliates’ significant ownership of Icahn Enterprises’ depositary units.
On August 4, 2020, the Board of Directors of the general partner of Icahn Enterprises declared a quarterly distribution in the amount of $2.00 per depositary unit. The quarterly distribution is payable in either cash or additional depositary units, at the election of each depositary unitholder and will be paid on or about September 29, 2020 to depositary unitholders of record at the close of business on August 21, 2020.
The declaration and payment of distributions is reviewed quarterly by Icahn Enterprises GP’s board of directors based upon a review of our balance sheet and cash flow, our expected capital and liquidity requirements, the provisions of our partnership agreement and provisions in our financing arrangements governing distributions, and keeping in mind that limited partners subject to U.S. federal income tax have recognized income on our earnings even if they do not receive distributions that could be used to satisfy any resulting tax obligations. The payment of future distributions will be determined by the board of directors quarterly, based upon the factors described above and other factors that it deems