ASGN Inc

The remainder of each executive's 2023 grant was delivered as performance-based RSUs which vest upon achievement of the average of three years of NOPAT growth over a three-year performance period, with the potential for positive or negative adjustment based on the Company's TSR over the performance period relative to a 47-company comparator group outlined below. NOPAT, which is a non-GAAP (U.S. Generally Accepted Accounting Principles) financial measure, is calculated as GAAP net operating income as adjusted for non-GAAP items including depreciation, amortization, stock-based compensation, acquisition, integration and strategic planning expenses, and other adjustments including the elimination of any impact from acquisitions or dispositions during the year. The performance-based RSUs will be eligible to vest on January 2, 2026 subject to achievement of the performance targets as follows, and subject to the executives' continued service (except in the case of certain qualifying terminations of employment and/or in the case of a change in control of the Company as discussed in more detail in "Payments upon Termination or Change in Control" below):

Payout Schedule

TSR Comparator Group: The following companies constitute the TSR comparator group for 2023 performance-based RSU awards, and were selected using the same following criteria as used previously:

•Categories:

◦IT Consulting and Other Services;

◦Research and Consulting Services; and

◦Human Resource and Employment Services

•Publicly-traded, U.S.-based company

•Russell 3000 constituent

•>$500MM in revenue