Biggest changeYear Ended December 31, 2024 compared to Year Ended December 31, 2023 Year Ended December 31, (Amounts in thousands, except percentages) 2024 2023 Change % Change Revenue, net $ 2,109,054 $ 1,885,842 $ 223,212 11.8 % Direct service costs, excluding depreciation and amortization 682,095 638,249 43,846 6.9 % Reimbursed out-of-pocket expenses 770,654 723,088 47,566 6.6 % Total direct costs 1,452,749 1,361,337 91,412 6.7 % Selling, general and administrative 180,184 161,352 18,832 11.7 % Depreciation 27,808 24,129 3,679 15.2 % Amortization 1,443 2,199 (756) (34.4) % Total operating expenses 1,662,184 1,549,017 113,167 7.3 % Income from operations 446,870 336,825 110,045 Miscellaneous income (expense), net 4,056 (655) 4,711 Interest income (expense), net 24,996 (488) 25,484 Income before income taxes 475,922 335,682 140,240 Income tax provision 71,536 52,872 18,664 Net income $ 404,386 $ 282,810 $ 121,576 Total revenue Total revenue increased by $223.2 million to $2,109.1 million for the year ended December 31, 2024, from $1,885.8 million for the year ended December 31, 2023.
Biggest changeManagement’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on February 11, 2025. - 34 - Table of Contents Year Ended December 31, 2025 compared to Year Ended December 31, 2024 Year Ended December 31, (Amounts in thousands, except percentages) 2025 2024 Change % Change Revenue, net $ 2,530,234 $ 2,109,054 $ 421,180 20.0 % Direct service costs, excluding depreciation and amortization 732,128 682,095 50,033 7.3 % Reimbursed out-of-pocket expenses 1,037,488 770,654 266,834 34.6 % Total direct costs 1,769,616 1,452,749 316,867 21.8 % Selling, general and administrative 197,559 180,184 17,375 9.6 % Depreciation 27,178 27,808 (630) (2.3) % Amortization 946 1,443 (497) (34.4) % Total operating expenses 1,995,299 1,662,184 333,115 20.0 % Income from operations 534,935 446,870 88,065 Miscellaneous (expense) income, net (5,338) 4,056 (9,394) Interest income, net 12,780 24,996 (12,216) Income before income taxes 542,377 475,922 66,455 Income tax provision 91,254 71,536 19,718 Net income $ 451,123 $ 404,386 $ 46,737 Total revenue Total revenue increased by $421.2 million, to $2,530.2 million for the year ended December 31, 2025, from $2,109.1 million for the year ended December 31, 2024.
Accounts receivable and unbilled, net, and advanced billings fluctuate on a regular basis as we perform our services, bill our customers and ultimately collect on those receivables.
Advanced billings and accounts receivable and unbilled, net fluctuate on a regular basis as we perform our services, bill our customers and ultimately collect on those receivables.
Actual results and the timing of events may differ materially from those indicated in such forward-looking statements. Important factors that may cause such differences include, but are not limited to, those discussed under the “Forward-Looking Statements” above and “Item IA. Risk Factors” in Part I of this Annual Report on Form 10-K.
Actual results and the timing of events may differ materially from those indicated in such forward-looking statements. Factors that may cause such differences include, but are not limited to, those discussed under the “Forward-Looking Statements” above and “Item IA. Risk Factors” in Part I of this Annual Report on Form 10-K.
A variety of discretionary awards (collectively, the “Awards”) for employees and non-employee directors are authorized under the 2016 Plan, including vested common shares, stock options, stock appreciation rights (SARs), restricted stock awards (RSAs), restricted stock units (RSUs), or other cash based or stock dividend equivalent awards.
A variety of discretionary awards (collectively, the “Awards”) for employees and non-employee directors are authorized under the Amended 2016 Plan, including vested common shares, stock options, stock appreciation rights (SARs), restricted stock awards (RSAs), restricted stock units (RSUs), or other cash based or stock dividend equivalent awards.
As of December 31, 2024 and 2023, as a result of an updated analysis of future cash needs in the United States and opportunities for investment outside the United States, we assert that all foreign earnings will be indefinitely reinvested and therefore we have not provided taxes on these earnings.
As of December 31, 2025 and 2024, as a result of an updated analysis of future cash needs in the United States and opportunities for investment outside the United States, we assert that all foreign earnings will be indefinitely reinvested and therefore we have not provided taxes on these earnings.
As of December 31, 2024, cash commitments to support operating business needs include lease liabilities discussed in Note 8 of the Consolidated Financial Statements, purchase commitments discussed in Note 12 of the Consolidated Financial Statements and capital expenditures primarily related to infrastructure investments in our facilities, equipment and technology.
As of December 31, 2025, cash commitments to support operating business needs include lease liabilities discussed in Note 8 of the Consolidated Financial Statements, purchase commitments discussed in Note 12 of the Consolidated Financial Statements and capital expenditures primarily related to infrastructure investments in our facilities, equipment and technology.
The 2016 Plan provides for long-term equity incentive compensation for key employees, officers and non-employee directors.
The Amended 2016 Plan provides for long-term equity incentive compensation for key employees, officers and non-employee directors.
This section of this Form 10-K generally discusses 2024 and 2023 items and year-to-year comparisons between 2024 and 2023. For a comparison of our results of operations for the fiscal years ended December 31, 2023 and December 31, 2022, see “Part II, Item 7.
This section of this Form 10-K generally discusses 2025 and 2024 items and year-to-year comparisons between 2025 and 2024. For a comparison of our results of operations for the fiscal years ended December 31, 2024 and December 31, 2023, see “Part II, Item 7.
We have translated the Euro into U.S. dollars using the following average exchange rates based on data obtained from www.xe.com: Year Ended December 31, 2024 2023 U.S. Dollars per Euro: 1.08 1.08 Results of Operations This section generally discusses 2024 and 2023 items and year-to-year comparisons between 2024 and 2023.
We have translated the Euro into U.S. dollars using the following average exchange rates based on data obtained from www.xe.com: Year Ended December 31, 2025 2024 U.S. Dollars per Euro: 1.13 1.08 Results of Operations This section generally discusses 2025 and 2024 items and year-to-year comparisons between 2025 and 2024.
The calculation of these liabilities involves dealing with uncertainties in the application of complex tax regulations in both domestic and foreign jurisdictions. These positions may be subject to audit and review by tax - 40 - Table of Contents authorities, and may result in future taxes, interest and penalties if we are unsuccessful in defending our positions.
The calculation of these liabilities involves dealing with uncertainties in the application of complex tax regulations in both domestic and foreign jurisdictions. These positions may be subject to audit and review by tax authorities, and may result in future taxes, interest and penalties if we are unsuccessful in defending our positions.
This simplified method utilizes the mid-point between the vesting date and the date of the contractual term. The risk free rate is based on extrapolated rates of U.S. Treasury bonds whose terms are consistent with the expected holding period of the stock options.
This simplified method utilizes the mid-point between the vesting date and the date of the contractual term. The risk free rate is based on extrapolated rates of U.S. Treasury bonds whose terms are consistent - 40 - Table of Contents with the expected holding period of the stock options.
Total Direct Costs Total direct costs are primarily driven by labor and related employee benefits, but also include contracted third party service related expenses, fees paid to site investigators, reimbursed out of pocket expenses, laboratory supplies and other expenses contributing to service delivery.
Total Direct Costs Total direct costs are primarily driven by labor and related employee benefits, but also include contracted third party service related expenses, fees paid to site investigators, reimbursed out of pocket expenses, laboratory supplies and other - 32 - Table of Contents expenses contributing to service delivery.
We believe that we are a partner of choice for small- and mid-sized biopharmaceutical - 32 - Table of Contents companies based on our ability to consistently utilize our full-service, disciplined operating model to deliver timely and high-quality results for our customers.
We believe that we are a partner of choice for small- and mid-sized biopharmaceutical companies based on our ability to consistently utilize our full-service, disciplined operating model to deliver timely and high-quality results for our customers.
Similar to new business awards, the number and amount of cancellations can vary significantly period over period due to timing of customer correspondence and study-specific circumstances. Net new business awards represent gross new business awards received in a period offset by total cancellations in that period.
Similar to new business awards, the number and amount of cancellations can vary significantly period over period due to timing of customer correspondence and study-specific circumstances. - 33 - Table of Contents Net new business awards represent gross new business awards received in a period offset by total cancellations in that period.
We recognize revenue, at an amount to which we expect to be entitled, related to work performed in connection with scope changes when the underlying services are performed and a binding contractual commitment has been established with the customer.
We recognize revenue, at an amount to which we expect to be entitled, related to work performed in connection with scope changes when the underlying services - 38 - Table of Contents are performed and a binding contractual commitment has been established with the customer.
However, we cannot assure you that our business will generate sufficient cash flow from operations, or that future borrowings will be available to us under our Credit Facility or otherwise, in an amount sufficient to fund our liquidity needs.
However, we cannot assure - 36 - Table of Contents you that our business will generate sufficient cash flow from operations, or that future borrowings will be available to us under our Credit Facility or otherwise, in an amount sufficient to fund our liquidity needs.
We have recognized certain liabilities, including penalties and interest in the amount of $6.7 million as of December 31, 2024, within other long-term liabilities on the consolidated balance sheets. These relate to uncertain tax positions that are subject to various assumptions and judgment. Liabilities for these uncertain tax positions are assessed on a position by position basis.
We have recognized certain liabilities, including penalties and interest in the amount of $8.3 million as of December 31, 2025, within other long-term liabilities on the consolidated balance sheets. These relate to uncertain tax positions that are subject to various assumptions and judgment. Liabilities for these uncertain tax positions are assessed on a position by position basis.
Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 13, 2024. This item and the related discussion contain forward-looking statements reflecting current expectations that involve risks and uncertainties.
Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on February 11, 2025. This item and the related - 31 - Table of Contents discussion contain forward-looking statements reflecting current expectations that involve risks and uncertainties.
The increase was primarily attributed to higher reimbursed out-of-pocket expenses and higher personnel costs to support the growth in service activities. Reimbursed out-of-pocket expenses, which can fluctuate significantly from period to period based on the timing of program initiation and closeout, increased $47.6 million for the year ended December 31, 2024, compared to the same period in the prior year.
The increase was primarily attributed to higher reimbursed out-of-pocket expenses and higher personnel costs to support the growth in service activities. Reimbursed out-of-pocket expenses, which can fluctuate significantly from period to period based on the timing of program initiation and closeout, increased $266.8 million for the year ended December 31, 2025, compared to the same period in the prior year.
Capital spending as a percentage of revenue decreased 21 basis points to 1.73% in the year ended December 31, 2024. We expect these activities will be funded from existing cash, cash flow from operations and, if necessary, borrowings under our existing or future credit facilities or other debt.
Capital spending as a percentage of revenue decreased 49 basis points to 1.24% in the year ended December 31, 2025. We expect these activities will be funded from existing cash, cash flow from operations and, if necessary, borrowings under our existing or future credit facilities or other debt.
Our global platform includes approximately 5,900 employees across 44 countries, providing our customers with broad access to diverse markets and patient populations as well as local regulatory expertise and market knowledge. How We Generate Revenue We earn fees through the performance of services detailed in our customer contracts.
Our global platform includes approximately 6,200 employees across 46 countries, providing our customers with broad access to diverse markets and patient populations as well as local regulatory expertise and market knowledge. How We Generate Revenue We earn fees through the performance of services detailed in our customer contracts.
These undistributed earnings of foreign subsidiaries will support future growth in foreign markets and maintain current operating needs of foreign locations. We will continue to monitor our assertion related to investment of foreign earnings. See Note 11 of the Notes to Consolidated Financial Statements for further information regarding this assertion.
These undistributed earnings of foreign subsidiaries will support future growth in foreign markets and maintain current operating needs of foreign locations. We will continue to monitor our assertion related to investment of foreign earnings and how this assertion may be impacted by the OBBBA. See Note 11 of the Notes to Consolidated Financial Statements for further information regarding this assertion.
Reported backlog will fluctuate based on new business awards, changes in scope to existing contracts, cancellations, net revenue recognition on existing contracts and foreign exchange adjustments from non-U.S. dollar denominated backlog. As of December 31, 2024, our backlog increased by $89.2 million, or 3.2% to $2,902.2 million compared to $2,813.0 million as of December 31, 2023.
Reported backlog will fluctuate based on new business awards, changes in scope to existing contracts, cancellations, net revenue recognition on existing contracts and foreign exchange adjustments from non-U.S. dollar denominated backlog. As of December 31, 2025, our backlog increased by $125.0 million, or 4.3% to $3,027.2 million compared to $2,902.2 million as of December 31, 2024.
Based on the analysis of the above factors, we determined that a valuation allowance in the amount of $1.6 million should be recorded as of December 31, 2024 and $1.8 million should be recorded as of December 31, 2023 relating to certain tax credits and other deferred tax assets that are currently not expected to be realized.
Based on the analysis of - 39 - Table of Contents the above factors, we determined that a valuation allowance in the amount of $1.8 million relating to certain foreign and federal deferred tax assets should be recorded as of December 31, 2025 and $1.6 million should be recorded as of December 31, 2024 relating to certain tax credits and other deferred tax assets that are currently not expected to be realized.
As of December 31, 2024, all outstanding stock based awards were classified within equity. The weighted average grant date fair value of employee stock options granted was $148.85, $85.30 and $47.57 for the years ended December 31, 2024, 2023 and 2022, respectively.
As of December 31, 2025, all outstanding stock based awards were classified within equity. The weighted average grant date fair value of employee stock options granted was $140.34, $148.85 and $85.30 for the years ended December 31, 2025, 2024 and 2023, respectively.
Net new business awards were $2,230.0 million and $2,356.7 million for the years ended December 31, 2024 and 2023, respectively. Backlog represents anticipated future net revenue from net new business awards that have commenced, but have not been completed.
Net new business awards were $2,646.8 million and $2,230.0 million for the years ended December 31, 2025 and 2024, respectively. Backlog represents anticipated future net revenue from net new business awards that have commenced, but have not been completed.
The increase was primarily attributed to higher personnel costs to support the growth in service activities. Personnel costs increased by $20.3 million in the year ended December 31, 2024, compared to the same period in the prior year.
The increase was primarily attributed to higher personnel costs to support the growth in service activities. Personnel costs increased by $17.1 million in the year ended December 31, 2025, compared to the same period in the prior year.
The change was mainly attributable to foreign exchange gains or losses that arise in connection with the revaluation of short-term inter-company balances between our domestic and international subsidiaries, gains or losses from foreign currency transactions, such as those resulting from the settlement of third-party accounts receivables and payables denominated in a currency other than the local currency of the entity making the payment and proceeds from the recovery of a note receivable, compared to the same period in the prior year.
This change was mainly attributable to foreign exchange gains or losses that arise in connection with the revaluation of short-term intercompany balances between our domestic and international subsidiaries and from the settlement of third-party accounts receivables and payables denominated in a currency other than the local currency of the entity making the payment, third-party - 35 - Table of Contents investment gains or losses and proceeds from the recovery of a note receivable, compared to the same period in the prior year.
We attempt to negotiate payment terms in order to provide for payments prior to or soon after the provision of services, but this timing of collection can vary significantly on a period by period comparative basis. Net cash flows provided by operating activities were $608.8 million for the year ended December 31, 2024 consisting of net income of $404.4 million.
We attempt to negotiate payment terms in order to provide for payments prior to or soon after the provision of services, but this timing of collection can vary significantly on a period by period comparative basis. Net cash flows provided by operating activities were $713.2 million for the year ended December 31, 2025 beginning with net income of $451.1 million.
Net cash flows provided by operating activities were $433.4 million for the year ended December 31, 2023 consisting of net income of $282.8 million.
Net cash flows provided by operating activities were $608.8 million for the year ended December 31, 2024 consisting of net income of $404.4 million.
Net cash used in investing activities was $34.6 million for the year ended December 31, 2023, primarily consisting of property and equipment expenditures.
Cash Flow from Investing Activities Net cash used in investing activities was $31.1 million for the year ended December 31, 2025, primarily consisting of property and equipment expenditures.
Cash Flow from Financing Activities Net cash used in financing activities was $154.0 million for the year ended December 31, 2024 primarily related to $169.9 million in repurchases of common stock, partially offset by proceeds from stock option exercises of $15.9 million.
Cash Flow from Financing Activities Net cash used in financing activities was $860.4 million for the year ended December 31, 2025 primarily related to $917.4 million in repurchases of common stock, partially offset by proceeds from stock option exercises of $57.0 million.
Our principal sources of liquidity are operating cash flows and from borrowings under our unsecured credit facility consisting of up to a $10.0 million revolving line of credit which we entered into on September 30, 2019 (the “Credit Facility”), and has subsequently been amended.
Our principal sources of liquidity are operating cash flows and from borrowings under our unsecured credit facility consisting of up to a $10.0 million revolving line of credit which we entered into on September 30, 2019 (the “Credit Facility”). All $10.0 million of the line of credit is available for borrowing as of December 31, 2025.
Miscellaneous income (expense), net Miscellaneous income (expense), net changed by $4.7 million, to $4.1 million of income for the year ended December 31, 2024 from $0.7 million of expense for the year ended December 31, 2023.
Miscellaneous (expense) income, net Miscellaneous (expense) income, net changed by $9.4 million of expense, to $5.3 million of expense for the year ended December 31, 2025, from $4.1 million of income for the year ended December 31, 2024.
The higher personnel costs portion increased by $45.9 million in the year ended December 31, 2024, compared to the same period in the prior year. Selling, general and administrative Selling, general and administrative expenses increased by $18.8 million, to $180.2 million for the year ended December 31, 2024 from $161.4 million for the year ended December 31, 2023.
The higher personnel costs portion increased by $43.4 million in the year ended December 31, 2025, compared to the same period in the prior year. Selling, general and administrative Selling, general and administrative expenses increased by $17.4 million, to $197.6 million for the year ended December 31, 2025, from $180.2 million for the year ended December 31, 2024.
Final settlement amounts are agreed to with the customer based on remaining work to be performed. These amounts are included in revenue when we believe the amount can be estimated reliably and its realization is probable.
Final settlement amounts are agreed to with the customer based on remaining work to be performed. These amounts are included in revenue when we believe the amount can be estimated reliably and its realization is probable. In evaluating the probability of recognition, we consider the contractual basis for the settlement amount and the objective evidence available to support the amount.
Year Ended December 31, Cash Flows (Amounts in thousands) 2024 2023 Net cash provided by operating activities $ 608,815 $ 433,374 Net cash used in investing activities (28,308) (34,629) Net cash used in financing activities (154,009) (182,642) Effect of exchange rates on cash, cash equivalents, and restricted cash (2,511) 1,081 Increase in cash, cash equivalents, and restricted cash $ 423,987 $ 217,184 Cash Flows from Operating Activities Cash flows from operations are driven mainly by net income, depreciation, deferred income tax benefit, stock-based compensation expense, noncash lease expense and net movement in advanced billings, accrued expenses, lease liabilities and accounts receivable and unbilled, net.
Year Ended December 31, Cash Flows (Amounts in thousands) 2025 2024 Net cash provided by operating activities $ 713,223 $ 608,815 Net cash used in investing activities (31,140) (28,308) Net cash used in financing activities (860,388) (154,009) Effect of exchange rates on cash, cash equivalents, and restricted cash 5,918 (2,511) (Decrease) increase in cash, cash equivalents, and restricted cash $ (172,387) $ 423,987 Cash Flows from Operating Activities Cash flows from operations are driven mainly by net income, deferred income tax provision (benefit), stock-based compensation expense, depreciation, noncash lease expense and net movement in advanced billings, accounts receivable and unbilled, net and accrued expenses.
The increase in the income tax provision was primarily attributable to the increase in pre-tax book income, which was partially offset by an increase in excess tax benefits recognized from share-based compensation and a decrease in uncertain tax positions, compared to the same period in the prior year.
The increase in the income tax provision was primarily attributable to the increase in pre-tax book income, increase in uncertain tax positions, increase in Global Intangible Low-Taxed Income ("GILTI") (net of foreign tax credits), and decrease in tax benefits related to Foreign Derived Intangible Income ("FDII") which was partially offset by an increase in excess tax benefits recognized from share-based compensation, compared to the same period in the prior year.
Compensation expense related to stock option awards to employees is recognized on a straight line basis based on the grant date fair value over the associated service period of the award, which is equal to the vesting term. - 41 - Table of Contents The following table summarizes the key weighted average assumptions used in the Black-Scholes-Merton option pricing model to calculate the fair value of options during the periods: Year Ended December 31, 2024 2023 2022 Expected holding period - years 4.3 4.1 4.7 Expected volatility 43.4% 45.4% 36.5% Risk-free interest rate 3.7% 3.8% 1.9% Expected dividend yield 0.0% 0.0% 0.0% The assumptions used in the table above reflect both grant date inputs to arrive at the grant date fair values for stock options subject to equity-classified stock compensation accounting and reflect a fair value calculation for stock options outstanding in the period subject to liability-classified stock compensation accounting.
The following table summarizes the key weighted average assumptions used in the Black-Scholes-Merton option pricing model to calculate the fair value of options during the periods: Year Ended December 31, 2025 2024 2023 Expected holding period - years 4.9 4.3 4.1 Expected volatility 43.5% 43.4% 45.4% Risk-free interest rate 4.1% 3.7% 3.8% Expected dividend yield 0.0% 0.0% 0.0% The assumptions used in the table above reflect grant date inputs to arrive at the grant date fair values for stock options subject to equity-classified stock compensation accounting.
We record revenue net of any tax assessments by governmental authorities that are imposed and concurrent with specific revenue generating transactions. Performance Obligations Substantially all of our contracts consist of a single performance obligation, as the promise to transfer the individual services described in the contracts are not separately identifiable from other promises in the contracts, and therefore not distinct.
Performance Obligations Substantially all of our contracts consist of a single performance obligation, as the promise to transfer the individual services described in the contracts are not separately identifiable from other promises in the contracts, and therefore not distinct.
While we do not anticipate that this will have a material impact on our tax provision or effective tax rate, we continue to monitor evolving tax legislation in the jurisdictions in which we operate. Stock Based Compensation In connection with the Company's initial public offering (IPO), the Board approved the 2016 Incentive Award Plan (the “2016 Plan”).
While we do not anticipate that this will have a material impact on our tax provision or effective tax rate, we continue to monitor evolving tax legislation in the jurisdictions in which we operate.
The Organization for Economic Co-operation and Development (OECD) has a framework to implement a global minimum corporate tax of 15% for companies with global revenues and profits above certain thresholds (referred to as Pillar Two), with certain aspects of Pillar Two effective January 1, 2024 and other aspects effective January 1, 2025.
The Organization for Economic Co-operation and Development ("OECD") has a framework to implement a global minimum corporate tax of 15% for companies with global revenues and profits above certain thresholds (referred to as Pillar Two). On January 5, 2026, the OECD/G20 announced the Side-by-Side ("SbS") package, implemented as administrative guidance and modifying the operation of Pillar 2 rules.
The increase was broad based, but primarily driven by strong activity within the Metabolic, Oncology, Cardiology and other uncategorized therapeutic areas, compared to the same period in the prior year. - 35 - Table of Contents Total direct costs Total direct costs increased by $91.4 million, to $1,452.7 million for the year ended December 31, 2024 from $1,361.3 million for the year ended December 31, 2023.
The increase was primarily driven by strong activity within the Metabolic, Oncology and Central Nervous System therapeutic areas, compared to the same period in the prior year. Total direct costs Total direct costs increased by $316.9 million, to $1,769.6 million for the year ended December 31, 2025, from $1,452.7 million for the year ended December 31, 2024.
Selling, General and Administrative Selling, general and administrative expenses are primarily driven by compensation and related employee benefits, as well as rent, utilities, supplies, software licenses, professional fees (e.g., legal and accounting expenses), travel, marketing and other operating expenses. - 33 - Table of Contents Depreciation Depreciation is provided on our property and equipment on the straight-line method at rates adequate to allocate the cost of the applicable assets over their estimated useful lives, which is three to five years for computer hardware, software, phone, and medical imaging equipment, five to seven years for furniture and fixtures and other equipment, and thirty to forty years for buildings.
Depreciation Depreciation is provided on our property and equipment on the straight-line method at rates adequate to allocate the cost of the applicable assets over their estimated useful lives, which is three to five years for computer hardware, software, phone, and medical imaging equipment, five to seven years for furniture and fixtures and other equipment, and thirty to forty years for buildings.
As of February 6, 2025, the Company's Board of Directors approved an increase of $600.0 million to the Company's new stock repurchase program. Repurchases under the share repurchase programs are executed in the open market or negotiated transactions under trading plans established pursuant to Rule 10b5-1.
As of December 31, 2025, the Company has remaining authorization of $821.7 million under the repurchase program. Repurchases under the share repurchase programs are executed in the open market or negotiated transactions under trading plans established pursuant to Rule 10b5-1.
These obligations are considered as a reduction in revenue when it appears probable that the arrangement thresholds will be met. We occasionally enter into incentive fee arrangements with customers that provide for additional compensation if certain defined contractual milestones or performance thresholds are met.
Certain contracts contain volume rebate arrangements with our customers that provide for rebates if certain specified spending thresholds are met. These obligations are considered as a reduction in revenue when it appears probable that the arrangement thresholds will be met.
Changes in operating assets and liabilities provided $106.5 million in operating cash flows and were primarily driven by increased advanced billings of $97.1 million and increased accrued expenses of $82.1 million, partially offset by increased accounts receivable and unbilled, net of $48.3 million. - 37 - Table of Contents Cash Flow from Investing Activities Net cash used in investing activities was $28.3 million for the year ended December 31, 2024, primarily consisting of property and equipment expenditures of $36.5 million, partially offset by $8.2 million in other investing activity.
Net cash used in investing activities was $28.3 million for the year ended December 31, 2024, primarily consisting of property and equipment expenditures of $36.5 million, partially offset by $8.2 million in other investing activity.
Adjustments to reconcile net income to net cash provided by operating activities were $44.1 million, primarily related to depreciation of $24.1 million, stock-based compensation expense of $20.5 million, and noncash lease expense of $19.6 million, partially offset by a deferred income tax benefit of $25.1 million.
Adjustments to reconcile net income to net cash provided by operating activities were $165.8 million, primarily related to deferred income tax provision of $80.8 million, stock-based compensation expense of $34.8 million, depreciation of $27.2 million and noncash lease expense of $23.0 million.
This change was mainly attributable to increased interest income on Cash and cash equivalents and a reduction in short-term debt, compared to the same period in the prior year. Income tax provision Income tax provision increased by $18.7 million, to $71.5 million for the year ended December 31, 2024 from $52.9 million for the year ended December 31, 2023.
Interest income, net Interest income, net decreased by $12.2 million, to $12.8 million for the year ended December 31, 2025, from $25.0 million for the year ended December 31, 2024. This change was mainly attributable to decreased interest income on Cash and cash equivalents, compared to the same period in the prior year.
For a comparison of our results of operations for the fiscal years ended December 31, 2023 and December 31, 2022, see “Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 13, 2024.
For a comparison of our results of operations for the fiscal years ended December 31, 2024 and December 31, 2023, see “Part II, Item 7.
Included within backlog as of December 31, 2024 was approximately $1,620.0 million to $1,640.0 million that we expect to convert to net revenue in 2025, with the remainder expected to convert to net revenue in years after 2025. - 34 - Table of Contents The effect of foreign currency adjustments on backlog was as follows: unfavorable foreign currency adjustments of $16.7 million for the year ended December 31, 2024 and favorable foreign currency adjustments of $14.6 million for the year ended December 31, 2023.
Included within backlog as of December 31, 2025 was approximately $1,890.0 million to $1,910.0 million that we expect to convert to net revenue in 2026, with the remainder expected to convert to net revenue in years after 2026.
The overall effective tax rates for the years ended December 31, 2024 and 2023 were 15.0% and 15.8%, respectively.
Income tax provision Income tax provision increased by $19.7 million, to $91.3 million for the year ended December 31, 2025, from $71.5 million for the year ended December 31, 2024. The overall effective tax rates for the years ended December 31, 2025 and 2024 were 16.8% and 15.0%, respectively.
These additional fees are included in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee and when achievement of the incentive milestone is deemed probable. These estimates are based on anticipated performance, our best judgment at the time or ultimately, upon achievement of the threshold or milestone.
We occasionally enter into incentive fee arrangements with customers that provide for additional compensation if certain defined contractual milestones or performance thresholds are met. These additional fees are included in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee and when achievement of the incentive milestone is deemed probable.
For the year ended December 31, 2023, the Company repurchased 781,068 shares for $144.0 million under the new repurchase program. For the year ended December 31, 2022, the Company repurchased 228,247 shares for $47.2 million under the new repurchase program. As of December 31, 2024, we have remaining authorization of $134.6 million under the new repurchase program.
For the year ended December 31, 2025, the Company repurchased 2,961,924 shares for $912.9 million under the repurchase program. For the year ended December 31, 2024, the Company repurchased 527,160 shares for $174.2 million under the repurchase program. For the year ended December 31, 2023, the Company repurchased 781,068 shares for $144.0 million under the repurchase program.
Approximately $31.8 million of our cash and cash equivalents, none of which was restricted, was held by our foreign subsidiaries as of December 31, 2024. - 36 - Table of Contents As of December 31, 2024, we had $10.0 million available for borrowing under the Credit Facility.
As of December 31, 2025, we had cash and cash equivalents of $497.0 million, which decreased from $669.4 million as of December 31, 2024 primarily due to repurchases of common stock. Approximately $21.2 million of our cash and cash equivalents, none of which was restricted, was held by our foreign subsidiaries as of December 31, 2025.
Share Repurchases In 2018, the Board of Directors approved a stock repurchase program which has been amended several times to increase the aggregate amount of the stock repurchase authorization. For the year ended December 31, 2022, the Company repurchased 5,463,244 shares for $800.5 million under this repurchase program.
Net cash used in financing activities was $154.0 million for the year ended December 31, 2024, primarily related to $169.9 million in repurchases of common stock, partially offset by proceeds from stock option exercises of $15.9 million. - 37 - Table of Contents Share Repurchases In 2022, the Company's Board of Directors (the "Board") approved a share repurchase program which has been amended several times to increase the aggregate amount of the share repurchase authorization.
The decrease in the overall effective tax rate was primarily attributable to a decrease in uncertain tax positions, which was partially offset by tax benefits related to Foreign Derived Intangible Income ("FDII"). Liquidity and Capital Resources We assess our liquidity in terms of our ability to generate cash to fund our operating, investing and financing activities.
The increase in the overall effective tax rate was primarily attributable to a decrease in tax benefits related to FDII, increase in uncertain tax positions and an increase in GILTI (net of foreign tax credits) which was partially offset by an increase in excess tax benefits recognized from share-based compensation compared to the same period in the prior year.