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Concentration of Risks and Significant Customers
6 Months Ended
Jun. 30, 2022
Risks and Uncertainties [Abstract]  
Concentration of Risks and Significant Customers Concentration Risks and Significant Customers
Financial instruments that potentially expose the Company to concentration of credit risk consist of cash and cash equivalents, marketable securities, accounts receivable and unbilled Customers' receivable, or collectively, Customers' receivables, and settlements receivable. Cash on deposit with financial institutions may, at times, exceed federally insured limits. Management believes that these financial institutions are financially sound and, accordingly, minimal credit risk exists. Cash and cash equivalents as of June 30, 2022 and December 31, 2021 include $0.5 billion and $1.2 billion, respectively, of investments in three money market mutual funds, which invest primarily in securities issued by the U.S. Government or U.S. Government agencies.
As of June 30, 2022, marketable securities were $444.9 million, and there was no concentration of securities of the same issuer with an aggregate fair value greater than 5% of the total balance, except for U.S. Treasuries, which amounted to $410.4 million, or 92% of the marketable securities. As of June 30, 2022, all debt securities within the Company's portfolio are investment grade.
As of December 31, 2021, marketable securities were $452.9 million, and there was no concentration of securities of the same issuer with an aggregate fair value greater than 5% of the total balance, except for U.S. Treasuries, which amounted to $418.3 million, or 92% of the marketable securities. As of December 31, 2021, all debt securities within the Company's portfolio are investment grade.
A significant portion of the Company's payment transactions are settled through one Issuing Bank, Sutton Bank. For the three months ended June 30, 2022 and 2021, 83% and 92% of Total Processing Volume, which is the total dollar amount of payments processed through the Company’s Platform, net of returns and chargebacks, was settled through Sutton Bank, respectively. For the six months ended June 30, 2022 and 2021, 84% and 93% of Total Processing Volume, which is the total dollar amount of payments processed through the Company’s Platform, net of returns and chargebacks, was settled through Sutton Bank, respectively.
A significant portion of the Company's revenue is derived from one Customer. For the three months ended June 30, 2022 and 2021, this Customer accounted for 69% and 72% of the Company’s net revenue, respectively. For the six months ended June 30, 2022 and 2021, this Customer accounted for 68% and 73% of the Company’s net revenue, respectively.