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, 2022, except for the 4.750% senior unsecured notes due 2024, the 5.250% senior unsecured notes due 2027 and 4.375% senior unsecured notes due 2029, 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, 2022 and December 31, 2021, we were in compliance with all covenants, including maintaining certain minimum financial ratios, as defined in the indentures. Additionally, as of June 30, 2022, based on covenants in the indentures governing our senior unsecured notes, we are not permitted to incur additional indebtedness; however, we are permitted to issue new notes in connection with debt refinancings of existing notes.
At-The-Market Offerings
During the six months ended June 30, 2022, Icahn Enterprises sold 7,546,779 depositary units pursuant to its Open Market Sale Agreement, resulting in gross proceeds of $394 million. As of June 30, 2022, we continue to have an active Open Market Sale Agreement and Icahn Enterprises may sell its depositary units for up to an additional $291 million in aggregate gross sale proceeds pursuant to this agreement. No assurance can be made that any or all amounts will be sold during the term of the agreement, and we have no obligation to sell additional depositary units under the Open Market Sale Agreement. Depending on market conditions, we may continue to sell depositary units under the Open Market Sale Agreement, and, if appropriate, enter into a new Open Market Sale Agreement to continue our “at-the-market” sales program once we have sold the full amount of our existing Open Market Sale Agreement. Our ability to access remaining capital under our “at-the-market” program may be limited by market conditions at the time of any future potential sale. While we were able to sell shares during the six months ended June 30, 2022, there can be no assurance that any future capital will be available on acceptable terms or at all under this program.
LP Unit Distributions
During the six months ended June, 30, 2022, Icahn Enterprises declared two quarterly distributions aggregating $4.00 per depositary unit in which each depositary unitholder had the option to make an election to receive either cash or additional depositary units. In connection with this distribution, aggregate cash distributions to all depositary unitholders that made a timely election to receive cash was $100 million during the six months ended June 30, 2022.
On August 3, 2022, the Board of Directors of the general partner of Icahn Enterprises declared a quarterly distribution in the amount of $2.00 per depositary unit, which will be paid on or about September 28, 2022 to depositary unitholders of record at the close of business on August 20, 2022. Depositary unitholders will have until September 16, 2022 to make a timely election to receive either cash or additional depositary units. If a unitholder does not make a timely election, it will automatically be deemed to have elected to receive the distribution in additional depositary units. Depositary unitholders who elect to receive (or who are deemed to have elected to receive) additional depositary units will receive units valued at the volume weighted average trading price of the units during the five consecutive trading days ending September 23, 2022. Icahn Enterprises will make a cash payment in lieu of issuing fractional depositary units to any unitholders electing to receive (or who are deemed to have elected to receive) depositary units.
Sale of Investments
During the six months ended June 30, 2022, we received proceeds of $153 million from the sale of equity investments held by the Holding Company.
Investment Segment Liquidity
In addition to investments by us and Mr. Icahn, the Investment Funds historically have access to significant amounts of cash available from prime brokerage lines of credit, subject to customary terms and market conditions.