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Concentration Risks and Significant Customers
3 Months Ended
Mar. 31, 2024
Risks and Uncertainties [Abstract]  
Concentration 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, short-term investments, and accounts receivable. Cash on deposit with financial institutions may exceed federally insured limits. Cash and cash equivalents as of March 31, 2024 and December 31, 2023 include $757.9 million and $628.0 million, respectively, of investments managed by two financial institutions, which invest primarily in securities issued by the U.S. Government or U.S. Government agencies.
As of March 31, 2024, short-term investments were $228.3 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 and U.S. agency securities, which amounted to $214.9 million, or 94% of the short-term investments. As of March 31, 2024, all debt securities within the Company's portfolio are investment grade.
As of December 31, 2023, short-term investments were $268.7 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 and U.S. agency securities, which amounted to $255.2 million, or 95% of the short-term investments. As of December 31, 2023, 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 March 31, 2024 and 2023, 74% and 80% 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 March 31, 2024 and 2023, this customer accounted for 49% and 76% of the Company’s net revenue, respectively. As of March 31, 2024, two other customers accounted for 16% and 10% of the Company’s accounts receivable balance.