Amendment No. 3 to Form S-1 Table of Contents We determine fair value of unvested and issued awards on the grant date using an option pricing model, adjusted for a lack of marketability and using an expected term or time to liquidity based on judgments made by management. We also consider forfeitures for equity•based grants which are not expected to vest. Expected volatility is calculated based upon historical volatility data from a group of comparable companies over a time frame consistent with the expected life of the awards. The expected risk-free rate is based on the U.S. Treasury yield curve rates in effect at the time of the grant using the term most consistent with the expected life of the award. Dividend yield was estimated at zero as we do not anticipate making regular future distributions to stockholders. Changes in these inputs and assumptions can materially affect the measurement of the estimated fair value of our equity-based compensation expense. We are required to estimate the enterprise value underlying our equity-based awards when performing fair value calculations. Due to the prior absence of a market for our equity interests, enterprise value is determined by management with the assistance of valuation specialists. The most recent valuation was performed as of January 2015 and uses a Market and Income approach weighted at 50% each. The Market Approach uses the Guideline Public Company Method, which focuses on comparing the subject entity to selected reasonably similar (or guideline) publicly traded companies. Under this method, valuation multiples are: (i) derived from the operating data of selected guideline companies; (ii) evaluated and adjusted based on the strengths and weaknesses of the subject entity relative to the selected guideline companies; and (iii) applied to the operating data of the subject entity to arrive at an indication of value. The Income Approach utilized the Discounted Cash Flow ('DCF") Method. The DCF Method