Our principal sources of liquidity on a short-term basis are cash and cash equivalents, cash flows provided by operations and availability under our credit facilities. On a long-term basis, our potential sources of liquidity also include raising capital through the issuance of additional equity and/or debt.
The primary uses of liquidity include debt service requirements, voluntary debt repayments, redemptions or purchases on the open market, working capital requirements, capital expenditures, business separation transaction costs, transformation costs, restructuring costs, dividends related to the Convertible Preferred Stock if we elect to pay such dividends in cash, litigation settlements, income tax payments and other contractual obligations.
We may be required to obtain additional financing in the future to address our liquidity needs, and, subject to market conditions, we may from time to time seek to amend, refinance, restructure, exchange or repurchase our outstanding indebtedness and/or raise additional equity or other financing. Any debt we incur in the future may have terms (including cash interest rate, financial covenants and covenants limiting our operating flexibility or ability to obtain additional financings) that are not favorable to us, and any such additional equity financing may dilute the economic and/or voting interests of our existing stockholders, may be preferred in right of payment to our outstanding common stock or confer other privileges to the holders and may contain financial or operational covenants that restrict our operating flexibility or ability to obtain additional financings. Furthermore, our failure to obtain any necessary financing, amendment, refinancing, restructuring, exchange or repurchases could have a material and adverse effect on our results of operations, cash flows, financial condition and liquidity.
We may experience volatility in cash flows between periods due to, among other reasons, variability in the timing of vendor payments and customer receipts. We may, from time to time, seek to obtain alternative sources of financing, by borrowing additional amounts under our Revolving Credit Facility, issuing debt or equity securities or incurring other indebtedness, if market conditions are favorable, utilizing trade credit, selling assets (including businesses or business lines) or securitizing receivables to meet future cash needs or to reduce our borrowing costs. Any issuance of equity or debt may be for cash or in exchange for our outstanding securities or indebtedness, or a combination thereof.
Certain of our outstanding debt securities and debt under our credit facilities are currently trading at discounts to their respective principal amounts. In order to reduce future cash interest payments, as well as future amounts due at maturity or upon redemption, we may, from time to time, purchase such debt for cash, in exchange for common or preferred stock or debt, or for a combination thereof, in each case in open-market purchases and/or privately negotiated transactions, tender offers or exchange offers and upon such terms and at such prices as we may determine. Any such transactions will be dependent upon several factors, including our liquidity requirements, contractual restrictions, general market conditions and applicable regulatory, legal and accounting factors. Whether or not we engage in any such transactions will be determined at our discretion. The amounts involved in any such transactions, individually or in the aggregate, may be material.
Although there are no financial maintenance covenants under the terms of our senior notes, there is a limitation, among other limitations, on certain future borrowings based on an adjusted leverage ratio or a fixed charge coverage ratio. These ratios are based on financial measures similar to non-GAAP adjusted EBITDA as presented in the “Reconciliation of Non-GAAP Measures” section below, but also give pro forma effect to certain events, including acquisitions, synergies and savings from cost reduction initiatives such as facility closures and headcount reductions. For the twelve months ended June 30, 2025, our non-GAAP pro forma adjusted EBITDA, as measured pursuant to the indentures governing our notes, was $1,024.5 million, which included annualized savings expected from cost reduction initiatives of $19.0 million so that the impact of cost reduction initiatives is fully reflected in the twelve-month period used in the calculation of the ratios. In addition to limitations under these indentures, our senior secured credit facilities contain customary negative covenants based on similar financial measures. We believe we are in compliance with the covenants under our indentures and senior secured credit facilities as of June 30, 2025.
Cash and cash equivalents decreased by $92.2 million during the six months ended June 30, 2025 as described under the Cash Flow Overview section below. As of June 30, 2025, approximately 44.2% of our cash and cash equivalents were held outside the U.S.