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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Operating activities |  |
Net income | $ 214 | $ 230
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization of intangible assets | 36 | 29
Amortization of deferred costs | 20 | 18
Amortization of ROU asset, lease modification, impairment, and abandonment | 2 | 6
Stock based compensation | 28 | 30
Other | 2 | 2
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (1) | 8
Unbilled revenue, net | 12 | 16
Other assets and prepaid expenses, net | (24) | (17)
Other payroll assets | 68 | (4)
Accounts payable and other liabilities | 0 | 2
Client deposits and other client liabilities | (27) | (23)
Accrued wages | 0 | 196
Accrued health insurance costs, net | (5) | (23)
Accrued workers' compensation costs, net | (9) | (9)
Payroll taxes payable and other payroll withholdings | (241) | (328)
Operating lease liabilities | (8) | (8)
Net cash provided by operating activities | 67 | 125
Investing activities |  |
Purchases of marketable securities | (170) | (157)
Proceeds from sale and maturity of marketable securities | 173 | 175
Acquisitions of property and equipment | (34) | (26)
Acquisition of subsidiary, net of cash acquired | 0 | (183)
Net cash used in investing activities | (31) | (191)
Financing activities |  |
Repurchase of common stock | (98) | (382)
Proceeds from issuance of common stock | 7 | 5
Revolver drawdown | 495 | 0
Revolver repayment | (495) | 0
Awards effectively repurchased for required employee withholding taxes | (9) | (8)
Net cash used in financing activities | (100) | (385)
Net decrease in cash and cash equivalents, unrestricted and restricted | (64) | (451)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,537 | 1,738
End of period | 1,473 | 1,287
Supplemental disclosures of cash flow information |  |
Interest paid | 12 | 9
Income taxes paid, net | 58 | 37
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | $ 5 | $ 3

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