CDW Corporation. Non-GAAP Reconciliations Second Quarter CDW.com

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CDW Corporation Non-GAAP Reconciliations Second Quarter 2018 CDW.com 800.800.4239

Adjusted EBITDA Reconciliation to Net Three Months Ended June 30, Six Months Ended June 30, 2018 2017 (1) 2018 2017 (1) Net $ 173.0 $ 140.9 $ 300.0 $ 199.0 Depreciation and amortization (2) 66.3 65.4 132.9 129.5 tax expense 56.8 54.4 95.5 70.8 Interest expense, net 37.2 35.9 74.9 75.6 EBITDA 333.3 296.6 603.3 474.9 Adjustments: Equity-based compensation 11.0 11.5 19.1 23.6 Net loss on extinguishments of long-term debt 57.4 Integration expenses (3) 2.0 2.5 Other adjustments (4) 0.4 4.4 2.1 6.1 Total adjustments 11.4 17.9 21.2 89.6 Adjusted EBITDA (5) $ 344.7 $ 314.5 $ 624.5 $ 564.5 (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). (2) Includes depreciation expense of $2 million for both the three months ended June 30, 2018 and 2017, reported within Cost of sales. Includes depreciation expense of $3 million for both the six months ended June 30, 2018 and 2017, reported within Cost of sales. (3) Comprised of expenses related to CDW UK. (4) Includes other expenses such as payroll taxes on equity-based compensation and the Company's share of net from its equity investment during the three and six months ended June 30, 2018 and 2017. Also includes historical retention costs during the three and six months ended June 30, 2017. (5) Adjusted EBITDA is a non-gaap financial measure. See Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018, for a discussion of non-gaap financial measures. 2

Q2 2018 Non-GAAP Net Reconciliation Three Months Ended June 30, 2018 Three Months Ended June 30, 2017 (1) before taxes tax expense (2) Net Effective tax rate before taxes tax expense (2) Net Effective tax rate GAAP, as reported $ 229.8 $ (56.8) $ 173.0 24.7% $ 195.3 $ (54.4) $ 140.9 27.9% Amortization of intangibles (3) 46.6 (11.7) 34.9 46.3 (16.7) 29.6 Equity-based compensation 11.0 (6.3) 4.7 11.5 (22.6) (11.1) Integration expenses (4) 2.0 (0.7) 1.3 Other adjustments (5) 0.7 (0.1) 0.6 3.7 (1.4) 2.3 Non-GAAP (6) $ 288.1 $ (74.9) $ 213.2 26.0% $ 258.8 $ (95.8) $ 163.0 37.0% (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) tax on non-gaap adjustments includes excess tax benefits associated with equity compensation. Additionally, 2018 includes the impact of global intangible low tax ("GILTI") on equity-based compensation and amortization of intangibles. (3) Includes amortization expense for acquisition-related intangible assets, primarily customer relationships, customer contracts and trade names. (4) Comprised of expenses related to CDW UK. (5) Includes other expenses such as payroll taxes on equity-based compensation during the three months ended June 30, 2018 and 2017. (6) Non-GAAP before taxes and Non-GAAP net are non-gaap financial measures. For a reconciliation of non-gaap financial measures, see Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018 and in these slides. 3

YTD Non-GAAP Net Reconciliation Six Months Ended June 30, 2018 Six Months Ended June 30, 2017 (1) before taxes tax expense (2) Net Effective tax rate before taxes tax expense (2) Net Effective tax rate GAAP, as reported $ 395.5 $ (95.5) $ 300.0 24.1% $ 269.8 $ (70.8) $ 199.0 26.2% Amortization of intangibles (3) 93.3 (24.0) 69.3 92.4 (33.2) 59.2 Equity-based compensation 19.1 (13.3) 5.8 23.6 (38.4) (14.8) Net Loss on extinguishments of longterm debt 57.4 (20.6) 36.8 Integration expenses (4) 2.5 (0.9) 1.6 Other adjustments (5) 1.2 (0.3) 0.9 4.9 (1.8) 3.1 Non-GAAP (6) $ 509.1 $ (133.1) $ 376.0 26.1% $ 450.6 $ (165.7) $ 284.9 36.8% (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) tax on non-gaap adjustments includes excess tax benefits associated with equity compensation. Additionally, 2018 includes the impact of GILTI on equitybased compensation and amortization of intangibles. (3) Includes amortization expense for acquisition-related intangible assets, primarily customer relationships, customer contracts and trade names. (4) Comprised of expenses related to CDW UK. (5) Includes other expenses such as payroll taxes on equity-based compensation during the six months ended June 30, 2018 and 2017. (6) Non-GAAP before taxes and Non-GAAP net are non-gaap financial measures. For a reconciliation of non-gaap financial measures, see Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018 and in these slides. 4

Non-GAAP Net Per Share ($ and shares in millions, except per share amounts) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 (1) 2018 2017 (1) Net $ 173.0 $ 140.9 $ 300.0 $ 199.0 Weighted-average common shares outstanding - Diluted 153.9 159.0 154.4 160.9 Net per diluted share $ 1.12 $ 0.89 $ 1.94 $ 1.24 Non-GAAP net (2) $ 213.2 $ 163.0 $ 376.0 $ 284.9 Non-GAAP weighted-average common shares outstanding - Diluted 153.9 159.0 154.4 160.9 Non-GAAP net per diluted share (2) $ 1.38 $ 1.03 $ 2.44 $ 1.77 (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) Non-GAAP net and Non-GAAP net per diluted share are non-gaap financial measures. See Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018, for a discussion of non-gaap financial measures. 5

Adjusted EBITDA Reconciliation to Net and Adjusted EBITDA Margin Calculation 2009-2013 2009 2010 2011 2012 2013 Net (loss) $ (373.4) $ (29.2) $ 17.1 $ 119.0 $ 132.8 Depreciation and amortization 218.2 209.4 204.9 210.2 208.2 tax expense (benefit) (87.8) (7.8) 11.2 67.1 62.7 Interest expense, net 431.7 391.9 324.2 307.4 250.1 EBITDA $ 188.7 $ 564.3 $ 557.4 $ 703.7 $ 653.8 Adjustments: Equity-based compensation 15.9 11.5 19.5 22.1 8.6 Net loss (gain) on extinguishments of long-term debt (2.0) 118.9 17.2 64.0 () loss from equity investments (0.1) (0.1) (0.3) (0.6) IPO and secondary-offering related expenses (1) 75.0 Goodwill impairment 241.8 Other adjustments (2) 19.0 28.1 21.6 23.9 7.7 Adjusted EBITDA $ 465.4 $ 601.8 $ 717.3 $ 766.6 $ 808.5 Net Sales $ 7,162.6 $ 8,801.2 $ 9,602.4 $ 10,128.2 $ 10,768.6 Adjusted EBITDA Margin (3) 6.5% 6.8% 7.5% 7.6% 7.5% (1) 2013 includes IPO related expenses of $74.3 million, consisting of (1) acceleration charge for certain equity awards and related employer payroll taxes ($40.7 million); (2) RDU Plan cash retention pool accrual ($7.5 million); (3) management services agreement termination fee ($24.4 million); and (4) other expenses ($1.7 million). 2013 also includes $0.7 million of secondaryoffering related expenses. 2014 and 2015 include various secondary offerings completed during that time. (2) Other adjustments primarily include items such as sponsor fees, historical retention costs, expenses related to the consolidated of office space and certain consulting and debt related professional fees. (3) Defined as Adjusted EBITDA divided by Net sales. 6

Adjusted EBITDA Reconciliation to Net and Adjusted EBITDA Margin Calculation 2014 - LTM Q2 2018 2014 2015 (1) 2016 (1)(2) 2017 (2) LTM Q2 2018 Net $ 244.9 $ 403.1 $ 425.1 $ 523.1 $ 624.0 Depreciation and amortization 207.9 227.4 254.5 261.0 264.3 tax expense 142.8 243.9 248.1 137.6 162.4 Interest expense, net 197.3 159.5 146.5 150.5 149.8 EBITDA $ 792.9 $ 1,033.9 $ 1,074.2 $ 1,072.2 $ 1,200.5 Adjustments: Equity-based compensation 16.4 31.2 39.2 43.7 39.2 Net loss on extinguishments of long-term debt 90.7 24.3 2.1 57.4 () loss from equity investments (3) (2.2) 10.1 (1.1) (0.7) 0.5 IPO and secondary-offering related expenses (4) 1.4 0.8 Acquisition and integration expenses (5) 10.2 7.3 2.5 Gain on remeasurement of equity investment (6) (98.1) Reinstatement of prior year unclaimed property balance (7) 4.1 4.1 Other adjustments (8) 7.8 6.1 (3.6) 6.9 1.7 Adjusted EBITDA $ 907.0 $ 1,018.5 $ 1,118.1 $ 1,186.1 $ 1,246.0 Net Sales $ 12,074.5 $ 12,988.7 $ 13,672.7 $ 14,832.9 $ 15,477.8 Adjusted EBITDA Margin (9) 7.5% 7.8% 8.2% 8.0% 8.1% (1) 2015 and 2016 reflect the impact of consolidating CDW UK's financial results for five months and twelve months, respectively. (2) Amounts for 2017 and 2016 have been adjusted to reflect the full retrospective adoption of Topic 606. (3) Represents the Company's share of net () loss from the Company's equity investments. 2015 includes the Company's 35% share of CDW UK's (previously known as Kelway) net loss which includes the Company's 35% share of an expense related to certain equity awards granted by one of the sellers to CDW UK coworkers in July 2015 prior to the acquisition. (4) 2014 and 2015 include various secondary offerings completed during that time. (5) Comprised of expenses related to CDW UK. (6) Represents the gain resulting from the remeasurement of the Company's previously held 35% equity investment to fair value upon the completion of the acquisition of CDW UK. (7) Comprised of the reinstatement of prior year unclaimed balances as a result of a retroactive Illinois state law change enacted in 2017. (8) Other adjustments primarily include items such as sponsor fees, historical retention costs, expenses related to the consolidated of office space, settlement payments received from the Dynamic Random Access Memory class action lawsuits and certain consulting and debt related professional fees. (9) Defined as Adjusted EBITDA divided by Net sales. 7

Non-GAAP Net Reconciliation 2010-2014 2010 2011 2012 2013 2014 Net $ (29.2) $ 17.1 $ 119.0 $ 132.8 $ 244.9 Amortization of intangibles (1) 166.8 165.7 163.7 161.2 161.2 Equity-based compensation 11.5 19.5 22.1 8.6 16.4 Net loss on extinguishments of long-term debt (2.0) 118.9 17.2 64.0 90.7 Interest expense adjustment related to extinguishments of long-term debt (2) (0.7) (19.4) (3.3) (7.5) (1.1) IPO and secondary-offering related expenses (3) 75.0 1.4 Debt-related refinancing costs 5.6 3.8 Other adjustments (4) (6.3) (0.6) Aggregate adjustment for taxes (5) (66.3) (106.8) (71.6) (113.5) (103.0) Non-GAAP net $ 85.7 $ 198.8 $ 247.1 $ 314.3 $ 409.9 (1) Includes amortization expense for acquisition-related intangible assets, primarily customer relationships, customer contracts and trade names. (2) Reflects adjustments to interest expense resulting from debt extinguishments. Represents the difference between interest expense previously recognized under the effective interest method and actual interest paid. (3) 2013 includes IPO related expenses of $74.3 million, consisting of (1) acceleration charge for certain equity awards and related employer payroll taxes ($40.7 million); (2) RDU Plan cash retention pool accrual ($7.5 million); (3) management services agreement termination fee ($24.4 million); and (4) other expenses ($1.7 million). 2013 also includes $0.7 million of secondary-offering related expenses. 2014 includes various secondary offerings completed during that time. (4) Other adjustments primarily include items such as expenses related to the consolidation of office space. (5) Aggregate adjustment for taxes consists of the following: 2010 2011 2012 2013 2014 Total Non-GAAP adjustments $ 181.2 $ 288.5 $ 199.7 $ 295.0 $ 268.0 Weighted-average statutory effective rate 39.0% 39.0% 39.0% 39.0% 39.0% tax (70.7) (112.5) (77.9) (115.1) (104.5) Non-deductible adjustments and other 4.4 5.7 6.3 1.6 1.5 Total aggregate adjustment for taxes $ (66.3) $ (106.8) $ (71.6) $ (113.5) $ (103.0) 8

Non-GAAP Net Reconciliation 2015 - LTM Q2 2018 2015 (1) 2016 (1)(2) 2017 (2) 2017 (2) 2018 LTM Q2 LTM Q2 Net $ 403.1 $ 425.1 $ 523.1 $ 428.4 $ 624.0 Amortization of intangibles (3) 173.9 187.2 185.1 185.1 186.0 Equity-based compensation 31.2 39.2 43.7 44.8 39.2 Equity-based compensation related to equity investment (4) 20.0 Net loss on extinguishments of long-term debt 24.3 2.1 57.4 59.5 IPO and secondary-offering related expenses (5) 0.8 Acquisition and integration expenses (6) 10.2 7.3 2.5 5.9 Gain on remeasurement of equity investment (7) (98.1) Reinstatement of prior year unclaimed property balance (8) 4.1 4.1 Other adjustments (9) 2.9 (5.4) 4.9 2.4 1.2 Aggregate adjustment for taxes (10) (64.8) (85.8) (214.9) (140.2) (157.5) Non-GAAP net $ 503.5 $ 569.7 $ 605.9 $ 585.9 $ 697.0 (1) 2015 and 2016 reflect the impact of consolidating CDW UK's financial results for five months and twelve months, respectively. (2) Amounts for 2017 and 2016 have been adjusted to reflect the full retrospective adoption of Topic 606. (3) Includes amortization expense for acquisition-related intangible assets, primarily customer relationships, customer contracts and trade names. (4) Represents the Company's 35% share of an expense related to certain equity awards granted by one of the sellers to CDW UK coworkers in July 2015 prior to the Company's acquisition. (5) 2015 includes various secondary offerings completed during that time. (6) Comprised of expenses related to CDW UK. (7) Represents the gain resulting from the remeasurement of the Company's previously held 35% equity investment to fair value upon the completion of the acquisition of CDW UK. (8) Comprised of the reinstatement of prior year unclaimed property balances as a results of a retroactive Illinois state law change enacted in 2017. (9) Other adjustments primarily include items such as expenses related to the consolidation of office space, settlement payments received from the Dynamic Random Access Memory class action lawsuits and the favorable resolution of a local sales tax matter. (10) Aggregate adjustment for taxes consists of the following: 2015 2016 2017 Total Non-GAAP adjustments $ 165.2 $ 230.4 $ 297.7 $ 297.7 $ 230.5 Weighted-average statutory effective rate 38.0% 36.0% 36.0% 36.0% 30.6% tax (62.8) (82.9) (107.2) (107.2) (70.5) Deferred tax adjustment due to law changes (4.0) (1.5) 1.3 (1.5) 1.9 Excess tax benefits from equity-based compensation (1.8) (36.2) (32.0) (14.7) Withholding tax expense on the unremitted earnings of our Canadian subsidiary 3.3 Impact from 2018 Tax Cut and Jobs Act (75.5) (75.5) Non-deductible adjustments and other (1.3) 0.4 2.7 0.5 1.3 Total aggregate adjustment for taxes $ (64.8) $ (85.8) $ (214.9) $ (140.2) $ (157.5) LTM Q2 2017 LTM Q2 2018 9

Return on Working Capital Calculation 2010 - LTM Q2 2018 2010 2011 2012 2013 2014 2015 2016 (1) 2017 (1) 2018 LTM Q2 Numerator from operations $ 352.7 $ 470.7 $ 510.6 $ 508.6 $ 673.0 $ 742.0 $ 820.0 $ 866.6 $ 934.7 Amortization of intangibles (2) 166.8 165.7 163.7 161.2 161.2 173.9 187.2 185.1 186.0 Debt-related refinancing costs (3) 5.6 3.8 Non-cash equity-based compensation 11.5 19.5 22.1 8.6 16.4 31.2 39.2 43.7 39.2 Other one-time items as incurred (4) 68.7 0.8 12.0 4.5 7.1 6.1 Adjusted NOPBT 536.6 659.7 696.4 747.1 851.4 959.1 1,050.9 1,102.5 1,166.0 Taxes (5) (209.3) (257.3) (271.6) (291.4) (332.0) (374.1) (388.9) (407.9) (367.2) Adjusted NOPAT $ 327.3 $ 402.4 $ 424.8 $ 455.7 $ 519.4 $ 585.1 $ 662.0 $ 694.6 $ 798.8 Denominator Trailing 5-point avg. AR (incl. misc. rec.) $ 1,210.7 $ 1,352.5 $ 1,400.1 $ 1,502.0 $ 1,629.6 $ 1,909.4 $ 2,251.7 $ 2,535.5 $ 2,722.7 Trailing 5-point avg. Inventory 286.9 317.4 330.3 357.5 396.2 387.1 422.0 457.5 493.2 Trailing 5-point avg. AP (500.4) (712.0) (831.2) (906.7) (1,017.8) (1,184.4) (1,470.8) (1,726.4) (1,872.8) Working Capital $ 997.2 $ 957.9 $ 899.2 $ 952.8 $ 1,008.0 $ 1,112.1 $ 1,202.9 $ 1,266.6 $ 1,343.1 Return on Working Capital (ROWC) 32.8% 42.0% 47.2% 47.8% 51.5% 52.6% 55.0% 54.8% 59.5% (1) Amounts for 2017 and 2016 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) Includes amortization expense for acquisition-related intangible assets, primarily customer relationships, customer contracts and trade names. (3) Represents fees and costs expensed related to the December 2010 and March 2011 amendments to the Company's prior term loan facility. (4) Includes IPO and secondary-offering related expenses, litigation items, acquisition and integration expenses and expenses related to the consolidation of office locations north of Chicago. (5) As of Q1 2018, the normalized statutory tax rate is 26%. The prior rate for Q1 2016- Q4 2017 was 37%, and the rate that was used for all prior periods before was 39%. 10

Consolidated Net Sales Growth on a Constant Currency Basis Three Months Ended June 30, Six Months Ended June 30, 2018 2017 (1) % Change (2) 2018 2017 (1) % Change (2) Consolidated Net sales, as reported $ 4,186.1 $ 3,891.7 7.6 % $ 7,792.5 $ 7,147.6 9.0% Foreign currency translation (3) 19.5 54.3 Consolidated Net sales, on a constant currency basis (4) $ 4,186.1 $ 3,911.2 7.0 % $ 7,792.5 $ 7,201.9 8.2% (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) There were 64 selling days for both the three months ended June 30, 2018 and 2017. There were 128 selling days for both the six months ended June 30, 2018 and 2017. (3) Represents the effect of translating the prior year results of CDW Canada and CDW UK at the average exchange rates applicable in the current year. (4) Consolidated Net sales growth on a constant currency basis is a non-gaap financial measure. For a discussion of non-gaap financial measures, see Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018. 11

Non-GAAP Net Per diluted share, on a Constant Currency Basis ($ and shares in millions, except per share amounts) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 (1) % Change 2018 2017 (1) % Change Net $ 173.0 $ 140.9 $ 300.0 $ 199.0 Amortization of intangibles 46.6 46.3 93.3 92.4 Equity-based compensation 11.0 11.5 19.1 23.6 Net Loss on extinguishments of long-term debt 57.4 Integration expenses 2.0 2.5 Other adjustments 0.7 3.7 1.2 4.9 Aggregate adjustment for taxes (18.1) (41.4) (37.6) (94.9) Non-GAAP Net (2)(3) $ 213.2 $ 163.0 30.8 % $ 376.0 $ 284.9 32.0% Foreign currency translation (4) 0.6 2.2 Non-GAAP Net, on a constant currency basis (3) $ 213.2 $ 163.6 30.2 % $ 376.0 $ 287.1 31.0% Shares used in computing Non-GAAP net per diluted share and Non-GAAP net per diluted share, on a constant currency basis 153.9 159.0 154.4 160.9 Non-GAAP net per diluted share (3) $ 1.38 $ 1.03 35.1 % $ 2.44 $ 1.77 37.6% Non-GAAP net per diluted share, on a constant currency basis (3) $ 1.38 $ 1.03 34.5 % $ 2.44 $ 1.78 36.5% (1) Amounts for 2017 have been adjusted to reflect the full retrospective adoption of Topic 606. (2) See Slide 12 in the Webcast Slides for details on the adjustments to Non-GAAP Net for the second quarter. See Slide 17 in the Webcast Slides for details on the adjustments to Non-GAAP Net for year to date. (3) Non-GAAP Net, Non-GAAP Net per diluted share, Non-GAAP Net on a constant currency basis and Non-GAAP Net per diluted share on a constant currency basis are non-gaap financial measures. For a discussion of non-gaap financial measures, see Exhibit 99.1 to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 2, 2018. (4) Represents the effect of translating the prior year results of CDW UK and CDW Canada at the average exchange rates applicable in the current year. 10