Third Quarter Fiscal 2018 Supplemental Information (1)

Third Quarter Fiscal 2018 Supplemental Information (1) (Dollars and shares in millions, except per share data, unaudited) Q3FY18 Q3FY17 (2) Y/Y Growth Revenues and Earnings Results GAAP Revenues $1,209 $1,041 16% Non-GAAP Revenues $1,234 $1,088 13% Diluted GAAP EPS $2.01 $0.07 2771% Diluted non-gaap EPS $0.49 $0.32 53% Revenues by Segment - Non-GAAP Enterprise Security $639 $691 (8%) Consumer Digital Safety $595 $397 50% Expenses and Profitability - Non-GAAP Gross margin 85.2% 84.8% 40 bps Operating expenses $588 $592 (1%) Operating income $463 $331 40% Operating margin 37.5% 30.4% 710 bps Net income $328 $209 57% Fully diluted shares outstanding 667 654 2% Balance Sheet, Cash Flow, and Other Metrics Cash, cash equivalents and short-term investments $2,532 $5,582 (55%) Cash flow from operating activities (2) $294 $148 99% Deferred revenue $2,730 $2,473 10% Purchases of property and equipment $33 $18 83% Stock repurchases - number of shares Headcount - 6.5 N/A 11,817 12,567 (6%) (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. For a reconciliation of our non-gaap financial measures to the comparable GAAP financial measures, please see the following trended reconciliation pages. (2) We adopted ASU 2016-09 Stock-Compensation in Q1 FY18. As part of the adoption of this ASU, prior period excess income tax benefits from the exercise of stock options have been reclassified from financing activities to operating activities to conform with the FY18 presentation. 1

Reconciliation of GAAP to Non-GAAP Revenue Detail (1) (Dollars in millions, unaudited) Q3FY18 Q3FY17 Revenues by Segment Enterprise Security $ 625 $ 644 Deferred revenue fair value adjustment 14 47 Exclude foreign exchange impact (14) - Enterprise Security constant currency adjusted revenues (Non-GAAP) $ 625 $ 691 Consumer Digital Safety $ 584 $ 397 Deferred revenue fair value adjustment 11 - Exclude foreign exchange impact (8) - Consumer Digital Safety constant currency adjusted revenues (Non-GAAP) $ 587 $ 397 Revenues by Segment - Y/Y Growth Rate (GAAP) Enterprise Security (3%) N/A Consumer Digital Safety 47% N/A Revenues by Segment - Y/Y Growth Rate in Constant Currency (Non-GAAP) Enterprise Security (10%) N/A Consumer Digital Safety 48% N/A Acquisition and Divestiture Adjusted Organic Growth in Constant Currency (2) Total revenues (GAAP) $ 1,209 $ 1,041 Deferred revenue fair value adjustment 25 47 Exclude foreign exchange impact (22) - Adjustment for acquisition (3) - 175 Adjustment for divestitures (4) (35) (104) Adjusted revenues for acquisitions and divestitures (Non-GAAP) $ 1,177 $ 1,159 Acquisition and Divestiture Adjusted Organic Growth Rate (Non-GAAP) 2% N/A Acquisition and Divestiture Adjusted Organic Growth in Constant Currency - Enterprise Security (2) Total revenues (GAAP) $ 625 $ 644 Deferred revenue fair value adjustment 14 47 Exclude foreign exchange impact (14) - Adjustment for acquisition (3) - 9 Adjustment for divestitures (4) (35) (104) Adjusted revenues for acquisitions and divestitures (Non-GAAP) $ 590 $ 596 Acquisition and Divestiture Adjusted Organic Growth Rate (Non-GAAP) (1%) N/A Acquisition Adjusted Organic Growth in Constant Currency - Consumer Digital Safety Total revenues (GAAP) $ 584 $ 397 Deferred revenue fair value adjustment 11 - Exclude foreign exchange impact (8) - Adjustment for acquisition (3) - 166 Adjustment for divestitures (4) - - Adjusted revenues for acquisitions (Non-GAAP) $ 587 $ 563 Acquisition Adjusted Organic Growth Rate (Non-GAAP) 4% N/A (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non- GAAP Measures. (2) Organic growth in constant currency is defined as revenue adjusted for the deferred revenue fair value adjustment, foreign exchange impact, and revenue from our WSS and PKI solutions divided by the year ago revenue adjusted for the deferred revenue fair value adjustment, pre-acquisition revenue from the acquired companies, and revenue from our WSS and PKI solutions. (3) Adjustment for acquisitions represents revenue from LifeLock for the three months ended December 31, 2016. (4) In Q2 FY18, we entered into a definitive agreement to sell our WSS and PKI solutions to DigiCert. The transaction was completed in Q3 FY18. We are presenting supplemental historical revenues for WSS and PKI solutions to provide readers with a better understanding of their impact on our historical results. WSS and PKI was historically reported in our Enterprise Security operating segment. 2

Reconciliation of Selected GAAP Measures to Non-GAAP Measures (1) (Dollars in millions, except per share data, unaudited) Q3FY18 Q3FY17 Y/Y Growth Rate Gross Margin Net revenues (GAAP) $ 1,209 $ 1,041 16% Deferred revenue fair value adjustment 25 47 Net revenues (Non-GAAP) $ 1,234 $ 1,088 13% Gross profit (GAAP) $ 960 $ 806 19% Deferred revenue fair value adjustment 25 47 Stock-based compensation 7 6 Amortization of intangible assets 59 51 Inventory fair value adjustment - 13 Gross profit (Non-GAAP) $ 1,051 $ 923 14% Gross margin (GAAP) 79.4% 77.4% 200 bps Gross margin (Non-GAAP) 85.2% 84.8% 40 bps Operating Margin Operating income (loss) (GAAP) $ 96 $ (16) (700%) Deferred revenue fair value adjustment 25 47 Inventory fair value adjustment - 13 Stock-based compensation 125 97 Amortization of intangible assets 111 94 Restructuring, transition and other costs 93 67 Acquisition related costs 13 29 Operating income (Non-GAAP) $ 463 $ 331 40% Operating margin (GAAP) 7.9% (1.5%) 940 bps Operating margin (Non-GAAP) 37.5% 30.4% 710 bps (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. 3

Reconciliation of GAAP to Non-GAAP Revenue Guidance Detail (1) (Dollars in millions, unaudited) Q4FY18 Q4FY18 Q4FY17 FY18 FY18 FY17 Low end of range High end of range Actual Low end of range High end of range Actual Revenue Adjusted Growth Guidance Total revenues (GAAP) $ 1,164 $ 1,194 $ 1,115 $ 4,790 $ 4,820 $ 4,019 Deferred revenue fair value adjustment 11 11 61 125 125 144 Adjusted non-gaap revenues 1,175 1,205 1,176 4,915 4,945 4,163 Exclude foreign exchange impact (28) (28) - (50) (50) - Adjusted non-gaap revenues excluding foreign exchange impact $ 1,147 $ 1,177 $ 1,176 $ 4,865 $ 4,895 $ 4,163 Adjustment for acquisition - - 76 - - 864 Adjustment for divestitures - - (104) (237) (237) (422) Adjusted non-gaap organic revenue $ 1,147 $ 1,177 $ 1,148 $ 4,628 $ 4,658 $ 4,605 Total revenues growth rate (GAAP) 4% 7% N/A 19% 20% N/A Adjusted non-gaap revenues growth rate 0% 2% N/A 18% 19% N/A Adjusted non-gaap growth rate excluding foreign exchange impact (2%) 0% N/A 17% 18% N/A Adjusted non-gaap organic revenue growth rate (2) 0% 3% N/A 0% 1% N/A Adjusted Growth Guidance - Enterprise Security Total revenues (GAAP) $ 565 $ 585 $ 656 $ 2,523 $ 2,543 $ 2,355 Deferred revenue fair value adjustment 10 10 33 62 62 116 Adjusted non-gaap revenues 575 595 689 2,585 2,605 2,471 Exclude foreign exchange impact (18) (18) - (37) (37) - Adjusted non-gaap revenues excluding foreign exchange impact $ 557 $ 577 $ 689 $ 2,548 $ 2,568 $ 2,471 Adjustment for acquisition - - 3 - - 307 Adjustment for divestitures - - (104) (237) (237) (422) Adjusted non-gaap organic revenue $ 557 $ 577 $ 588 $ 2,311 $ 2,331 $ 2,357 Total revenues growth rate (GAAP) (14%) (11%) N/A 7% 8% N/A Adjusted non-gaap revenues growth rate (17%) (14%) N/A 5% 5% N/A Adjusted non-gaap growth rate excluding foreign exchange impact (19%) (16%) N/A 3% 4% N/A Adjusted non-gaap organic revenue growth rate (2) (5%) (2%) N/A (2%) (1%) N/A Adjusted Growth Guidance - Consumer Digital Safety Total revenues (GAAP) $ 599 $ 609 $ 459 $ 2,267 $ 2,277 $ 1,664 Deferred revenue fair value adjustment 1 1 28 63 63 28 Adjusted non-gaap revenues 600 610 487 2,330 2,340 1,692 Exclude foreign exchange impact (10) (10) - (13) (13) - Adjusted non-gaap revenues excluding foreign exchange impact $ 590 $ 600 $ 487 $ 2,317 $ 2,327 $ 1,692 Adjustment for acquisition - - 73 - - 556 Adjusted non-gaap organic revenue $ 590 $ 600 $ 560 $ 2,317 $ 2,327 $ 2,248 Total revenues growth rate (GAAP) 31% 33% N/A 36% 37% N/A Adjusted non-gaap revenues growth rate 23% 25% N/A 38% 38% N/A Adjusted non-gaap growth rate excluding foreign exchange impact 21% 23% N/A 37% 38% N/A Adjusted non-gaap organic revenue growth rate (2) 5% 7% N/A 3% 3% N/A (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. (2) Organic growth in constant currency is defined as revenue adjusted for the deferred revenue fair value adjustment, foreign exchange impact, and revenue from our WSS and PKI solutions divided by the year ago revenue adjusted for the deferred revenue fair value adjustment, pre-acquisition revenue from the acquired companies, and revenue from our WSS and PKI solutions. 4

Trended Reconciliation of GAAP to Non-GAAP Statements of Operations (1) (Dollars and shares in millions, except per share data, unaudited) Q3FY18 Q2FY18 Q1FY18 Q4FY17 Q3FY17 Q2FY17 Q1FY17 FY17 GAAP Net revenues $ 1,209 $ 1,240 $ 1,175 $ 1,115 $ 1,041 $ 979 $ 884 $ 4,019 Cost of revenues 249 262 257 259 235 210 149 853 Gross profit 960 978 918 856 806 769 735 3,166 Operating expenses Sales and marketing 372 434 433 453 377 338 291 1,459 Research and development 225 241 233 249 204 200 170 823 General and administrative 122 160 149 204 131 145 84 564 Amortization of intangible assets 52 55 59 56 43 34 14 147 Restructuring, transition, and other costs 93 97 88 72 67 64 70 273 Total operating expenses 864 987 962 1,034 822 781 629 3,266 Operating income (loss) 96 (9) (44) (178) (16) (12) 106 (100) Non-operating income (expense), net Interest income 5 5 6 7 5 4 5 21 Interest expense (58) (57) (84) (74) (55) (52) (27) (208) Gain on divestiture 658 - - - - - - - Other income (expense), net 4 (8) (12) (3) 5 10 13 25 Total non-operating income (expense), net 609 (60) (90) (70) (45) (38) (9) (162) Income (loss) from continuing operations before income taxes 705 (69) (134) (248) (61) (50) 97 (262) Income tax expense (benefit) (606) (53) (24) (71) (5) 19 31 (26) Income (loss) from continuing operations 1,311 (16) (110) (177) (56) (69) 66 (236) Income (loss) from discontinued operations, net of income taxes 31 4 (23) 34 102 (75) 69 130 Net income (loss) $ 1,342 $ (12) $ (133) $ (143) $ 46 $ (144) $ 135 $ (106) Reconciliation of Non-GAAP Adjustments Net revenues Deferred revenue fair value adjustment $ 25 $ 36 $ 53 $ 61 $ 47 $ 36 $ - $ 144 Cost of revenue Stock-based compensation 7 9 6 7 6 5 3 21 Amortization of intangible assets 59 61 55 54 51 35 6 146 Inventory fair value adjustment - - - - 13 11-24 Total gross profit adjustment 91 106 114 122 117 87 9 335 Operating expenses Stock-based compensation 118 167 141 202 91 80 46 419 Amortization of intangible assets 52 55 59 56 43 34 14 147 Restructuring, transition and other costs 93 97 88 72 67 64 70 273 Acquisition related costs 13 19 19 40 29 43 8 120 Total operating expense adjustment 276 338 307 370 230 221 138 959 Net income (loss) adjustment from continuing operations Gross profit adjustment 91 106 114 122 117 87 9 335 Operating expense adjustment 276 338 307 370 230 221 138 959 Non-cash interest expense 9 5 27 16 8 12-36 Gain on divestiture (658) - - - - - - - Income tax reform (810) - - - - - - - Other income tax effects and adjustments 109 (165) (117) (147) (90) (59) (36) (332) Total income (loss) adjustment from continuing operations (983) 284 331 361 265 261 111 998 Total income (loss) adjustment from discontinued operations (31) (4) 23 (34) (102) 75 (69) (130) Total net income (loss) adjustment $ (1,014) $ 280 $ 354 $ 327 $ 163 $ 336 $ 42 $ 868 Non-GAAP Net revenues $ 1,234 $ 1,276 $ 1,228 $ 1,176 $ 1,088 $ 1,015 $ 884 $ 4,163 Cost of revenues 183 192 196 198 165 159 140 662 Gross profit 1,051 1,084 1,032 978 923 856 744 3,501 Operating expenses Sales and marketing 340 379 382 381 341 314 276 1,312 Research and development 175 188 191 203 178 177 155 713 General and administrative 73 82 82 80 73 69 60 282 Total operating expenses 588 649 655 664 592 560 491 2,307 Operating income 463 435 377 314 331 296 253 1,194 Non-operating expense, net Interest income 5 5 6 7 5 4 5 21 Interest expense (49) (52) (57) (58) (47) (40) (27) (172) Other income (expense), net 4 (8) (12) (3) 5 10 13 25 Total non-operating income (expense), net (40) (55) (63) (54) (37) (26) (9) (126) Income before income taxes 423 380 314 260 294 270 244 1,068 Provision for income taxes 95 112 93 76 85 78 67 306 Net income $ 328 $ 268 $ 221 $ 184 $ 209 $ 192 $ 177 $ 762 Shares Diluted GAAP weighted-average shares outstanding 667 615 609 618 620 620 620 618 Incremental dilution - 51 55 45 34 24-27 Diluted non-gaap weighted-average shares outstanding 667 666 664 663 654 644 620 645 Reconciliation of Net Income (Loss) per Share (2) GAAP net income (loss) per share $ 2.01 $ (0.02) $ (0.22) $ (0.23) $ 0.07 $ (0.23) $ 0.22 $ (0.17) Total income (loss) adjustment from continuing operations per share $ (1.47) $ 0.43 $ 0.51 $ 0.57 $ 0.41 $ 0.41 $ 0.18 $ 1.56 Total income (loss) adjustment from discontinued operations per share $ (0.05) $ (0.01) $ 0.04 $ (0.06) $ (0.16) $ 0.12 $ (0.11) $ (0.21) Non-GAAP net income per share $ 0.49 $ 0.40 $ 0.33 $ 0.28 $ 0.32 $ 0.30 $ 0.29 $ 1.18 (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. (2) Non-GAAP net income per share amounts may not add due to rounding. 5

Reconciliation of GAAP Revenue to Non-GAAP Implied Billings (1) (Dollars in millions, unaudited) Q3FY18 Q2FY18 Q1FY18 Q4FY17 Q3FY17 Q2FY17 Q1FY17 Total Company Implied Billings (Non-GAAP) (2) Total revenue $ 1,209 $ 1,240 $ 1,175 $ 1,115 $ 1,041 $ 979 $ 884 Add: Deferred revenue (end of period) 2,730 2,514 2,794 2,787 2,473 2,487 2,417 Less: Deferred revenue (beginning of period) (2,514) (2,794) (2,787) (2,473) (2,487) (2,417) (2,638) Deferred revenue adjustments (3) 3 296 17 (64) 54 (153) 106 Implied billings (Non-GAAP) $ 1,428 $ 1,256 $ 1,199 $ 1,365 $ 1,081 $ 896 $ 769 Enterprise Security Implied Billings (Non-GAAP) (2) Total revenue $ 625 $ 686 $ 646 $ 656 $ 644 $ 574 $ 481 Add: Deferred revenue (end of period) 1,685 1,484 1,784 1,791 1,654 1,629 1,534 Less: Deferred revenue (beginning of period) (1,484) (1,784) (1,791) (1,654) (1,629) (1,534) (1,726) Deferred revenue adjustments (3) 3 296 17 32 54 (153) 106 Implied billings (Non-GAAP) $ 829 $ 682 $ 656 $ 825 $ 723 $ 516 $ 395 Consumer Digital Safety Implied Billings (Non-GAAP) (2) Total revenue $ 584 $ 554 $ 529 $ 459 $ 397 $ 405 $ 403 Add: Deferred revenue (end of period) 1,045 1,030 1,010 996 819 858 883 Less: Deferred revenue (beginning of period) (1,030) (1,010) (996) (819) (858) (883) (912) Deferred revenue adjustments (3) - - - (96) - - - Implied billings (Non-GAAP) $ 599 $ 574 $ 543 $ 540 $ 358 $ 380 $ 374 ----------------------------------------------------------------------------------------------------------------------------------------------------------- Included in the Enterprise Security implied billings are WSS & PKI revenue and deferred revenue amounts, as presented below. WSS & PKI Implied Billings (Non-GAAP) (4) Total revenue $ 35 $ 100 $ 103 $ 104 $ 104 $ 108 $ 106 Add: Deferred revenue (end of period) (5) 285 291 308 319 303 316 337 Less: Deferred revenue (beginning of period) (291) (308) (319) (303) (316) (337) (360) Implied billings (Non-GAAP) $ 29 $ 83 $ 92 $ 120 $ 91 $ 87 $ 83 (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. (2) During Q2 FY17, on August 1, 2016, we completed the acquisition of Blue Coat. During Q4 FY17, on February 9, 2017, we completed the acquisition of LifeLock. The pre-acquisition implied billings of Blue Coat and LifeLock are not included in our implied billings. (3) Deferred revenue adjustments include deferred revenue acquired during the period and the change in deferred revenue related to Veritas discontinued operations. In addition, for Q3 FY18, the adjustment includes the in-quarter change in WSS & PKI deferred revenue prior to the divestiture that is not captured in the GAAP Enterprise Security deferred revenue change due to its classification as liabilities held for sale. For Q2 FY18, the adjustment includes the ending Q2 FY18 WSS & PKI deferred revenue because this balance was not captured in the GAAP Enterprise Security deferred revenue change due to its classification as liabilities held for sale. WSS & PKI deferred revenue was part of GAAP Enterprise Security deferred revenue at the beginning of Q2 FY18 and for all prior periods. See additional information in Explanation of Non-GAAP Measures. (4) On October 31, 2017 we sold our WSS and PKI solutions. We are presenting supplemental historical revenues and implied billings for WSS and PKI solutions to provide readers with a better understanding of their impact on our historical results. WSS and PKI was historically reported in our Enterprise Security operating segment. (5) The Q3 FY18 end of period WSS and PKI deferred revenue is as of October 31, 2017, the date we sold our WSS and PKI solutions. 6

Reconciliation of Selected GAAP to Non-GAAP Consumer Digital Safety Metrics (In millions except ARPU, unaudited) Q3FY18 Q2FY18 Q1FY18 (3) (4) (5) Consumer Digital Safety Direct ARPU Consumer Digital Safety from direct customers revenues $ 526 $ 494 $ 472 Deferred revenue fair value adjustment 10 20 29 Consumer Digital Safety from direct customers adjusted revenues (Non-GAAP) $ 536 $ 514 $ 501 Average Consumer Digital Safety direct customer count 21.3 21.2 21.2 Consumer Digital Safety Direct ARPU (GAAP) $ 8.23 $ 7.77 $ 7.42 Consumer Digital Safety Direct ARPU (Non-GAAP) $ 8.38 $ 8.07 $ 7.87 Consumer Digital Safety Partner Revenue (6) Consumer Digital Safety partner revenue $ 58 $ 60 $ 57 Deferred revenue fair value adjustment 1 1 1 Consumer Digital Safety partner adjusted revenues (Non-GAAP) $ 59 $ 61 $ 58 (1) (2) (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. (2) These metrics are derived from data related to our Norton and LifeLock products that had different measurements historically. Therefore, we are unable to provide comparative metrics for the prior fiscal year. (3) Total revenue from direct customers divided by the average Consumer Digital Safety direct customer count for the period, expressed as a monthly figure. (4) Numbers may not add due to rounding. (5) Consumers who have a direct billing relationship with Symantec, including online acquisition and retention, affiliates, co-marketing, and OEM channels, but excluding retail and other partners. (6) Revenue generated through billing relationships with partners. Examples are retailers, service providers, and corporations who often purchase on behalf of their end customers or employees. 7

(1) (2) Reconciliation of GAAP Revenue to Non-GAAP Deferred Revenue (Dollars in millions, unaudited) Q3FY18 Q2FY18 (3) Q1FY18 Q4FY17 Q3FY17 Q2FY17 Q1FY17 Total Company Deferred Revenue GAAP Total $ 2,730 $ 2,514 $ 2,794 $ 2,787 $ 2,473 $ 2,487 $ 2,417 Purchase Accounting 56 80 116 167 137 184 - Veritas (39) (48) (54) (71) (103) (157) (224) Blue Coat - - - - - - 434 LifeLock - - - - 181 189 197 WSS & PKI - - (308) (319) (303) (316) (337) Non-GAAP Total $ 2,747 $ 2,546 $ 2,548 $ 2,564 $ 2,385 $ 2,387 $ 2,487 Non-GAAP ST 2,158 2,058 2,122 2,166 2,015 2,013 2,117 Non-GAAP LT 589 488 426 398 370 374 370 Enterprise Security Deferred Revenue GAAP Total $ 1,685 $ 1,484 $ 1,784 $ 1,791 $ 1,654 $ 1,629 $ 1,534 Purchase Accounting 55 68 84 104 137 184 - Veritas (39) (48) (54) (71) (103) (157) (224) Blue Coat - - - - - - 434 WSS & PKI - - (308) (319) (303) (316) (337) Non-GAAP Total $ 1,701 $ 1,504 $ 1,506 $ 1,505 $ 1,385 $ 1,340 $ 1,407 Non-GAAP ST 1,153 1,059 1,127 1,157 1,065 1,026 1,099 Non-GAAP LT 548 445 379 348 320 314 308 Consumer Digital Safety Deferred Revenue GAAP Total $ 1,045 $ 1,030 $ 1,010 $ 996 $ 819 $ 858 $ 883 Purchase Accounting 1 12 32 63 - - - LifeLock - - - - 181 189 197 Non-GAAP Total $ 1,046 $ 1,042 $ 1,042 $ 1,059 $ 1,000 $ 1,047 $ 1,080 Non-GAAP ST 1,005 999 995 1,009 950 987 1,018 Non-GAAP LT 41 43 47 50 50 60 62 (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. (2) Non-GAAP adjusted deferred revenue excludes deferred revenue balances related to our Veritas discontinued operations and WSS & PKI solutions to reflect the impact of the divestitures. Our non-gaap deferred revenue balances includes LifeLock s and Blue Coat s pre-acquisition non-gaap deferred revenue for comparative purposes. In addition, our non-gaap deferred revenue excludes the impact of purchase accounting for comparative purposes. (3) The Q2 FY18 deferred revenue balance related to WSS & PKI products was included in assets held for sale and, therefore, not reflected in GAAP deferred revenues. 8

Trended Segment Revenues and Operating Margin (1) (Dollars in millions, unaudited) Q3FY18 Q2FY18 Q1FY18 Q4FY17 Q3FY17 Q2FY17 GAAP Adj Non-GAAP GAAP Adj Non-GAAP GAAP Adj Non-GAAP GAAP Adj Non-GAAP GAAP Adj Non-GAAP GAAP Adj Non-GAAP GAAP GAAP Adj Non-GAAP Revenues Total Revenues $ 1,209 $ 25 $ 1,234 $ 1,240 $ 36 $ 1,276 $ 1,175 $ 53 $ 1,228 $ 1,115 $ 61 $ 1,176 $ 1,041 $ 47 $ 1,088 $ 979 $ 36 $ 1,015 $ 884 $ 4,019 $ 144 $ 4,163 Total Y/Y Growth Rate 16% (3%) 13% 27% (1%) 26% 33% 6% 39% 28% 7% 35% 15% 5% 20% 8% 4% 12% (3%) 12% 4% 16% Revenues by Segment Enterprise Security $ 625 $ 14 $ 639 $ 686 $ 15 $ 701 $ 646 $ 23 $ 669 $ 656 $ 33 $ 689 $ 644 $ 47 $ 691 $ 574 $ 36 $ 610 $ 481 $ 2,355 $ 116 $ 2,471 Enterprise Security - Y/Y Growth Rate (3%) (5%) (8%) 20% (5%) 15% 34% 5% 39% 40% 8% 48% 30% 10% 40% 18% 8% 26% 0% 22% 6% 28% Consumer Digital Safety $ 584 $ 11 $ 595 $ 554 $ 21 $ 575 $ 529 $ 30 $ 559 $ 459 $ 28 $ 487 $ 397 $ - $ 397 $ 405 $ - $ 405 $ 403 $ 1,664 $ 28 $ 1,692 Consumer Digital Safety - Y/Y Growth Rate 47% 3% 50% 37% 5% 42% 31% 8% 39% 13% 7% 20% (4%) 0% (4%) (4%) 0% (4%) (6%) 0% 1% 1% Q1FY17 FY17 Operating Income by Segment Enterprise Security $ 136 $ 14 $ 150 $ 147 $ 15 $ 162 $ 94 $ 23 $ 117 $ 76 $ 33 $ 109 $ 58 $ 60 $ 118 $ 25 $ 47 $ 72 $ 28 $ 187 $ 140 $ 327 Consumer Digital Safety 302 11 313 252 21 273 230 30 260 177 28 205 213-213 224-224 225 839 28 867 Total Operating Income by Segment 438 25 463 399 36 435 324 53 377 253 61 314 271 60 331 249 47 296 253 1,026 168 1,194 Reconciling Items: Stock-based compensation 125 (125) - 176 (176) - 147 (147) - 209 (209) - 97 (97) - 85 (85) - 49 440 (440) - Amortization of intangible assets 111 (111) - 116 (116) - 114 (114) - 110 (110) - 94 (94) - 69 (69) - 20 293 (293) - Restructuring, transition and other costs 93 (93) - 97 (97) - 88 (88) - 72 (72) - 67 (67) - 64 (64) - 70 273 (273) - Acquisition related costs 13 (13) - 19 (19) - 19 (19) - 40 (40) - 29 (29) - 43 (43) - 8 120 (120) - Total Consolidated Operating Income (Loss) $ 96 $ 367 $ 463 $ (9) $ 444 $ 435 $ (44) $ 421 $ 377 $ (178) $ 492 $ 314 $ (16) $ 347 $ 331 $ (12) $ 308 $ 296 $ 106 $ (100) $ 1,294 $ 1,194 Operating Margin by Segment Enterprise Security 22% 1% 23% 21% 2% 23% 15% 2% 17% 12% 4% 16% 9% 8% 17% 4% 8% 12% 6% 8% 5% 13% Consumer Digital Safety 52% 1% 53% 45% 2% 47% 43% 4% 47% 39% 3% 42% 54% 0% 54% 55% 0% 55% 56% 50% 1% 51% (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. 9

Trended Detail of Certain Non-GAAP Operating Expense Adjustments (1) (Dollars and shares in millions, except per share data, unaudited) Q3FY18 Q2FY18 Q1FY18 Q4FY17 Q3FY17 Q2FY17 Q1FY17 FY17 Detail of Certain Non-GAAP Operating Expense Adjustments Stock-based compensation Sales and marketing $ 30 $ 50 $ 43 $ 44 $ 25 $ 24 $ 14 $ 107 Research and development 49 53 41 46 25 24 15 110 General and administrative 39 64 57 112 41 32 17 202 Total stock-based compensation operating expenses $ 118 $ 167 $ 141 $ 202 $ 91 $ 80 $ 46 $ 419 Acquisition related costs Sales and marketing $ 2 $ 5 $ 8 $ 28 $ 11 $ - $ 1 $ 40 Research and development 1-1 - 1 (1) - - General and administrative 10 14 10 12 17 44 7 80 Total acquisition related costs $ 13 $ 19 $ 19 $ 40 $ 29 $ 43 $ 8 $ 120 (1) This presentation includes non-gaap measures. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP. For a detailed explanation of these non-gaap measures, please see Explanation of Non-GAAP Measures. 10

Balance Sheet, Cash Flow and Headcount Trends (Dollars in millions, except foreign exchange rates, unaudited) Q3FY18 Q2FY18 Q1FY18 Q4FY17 Q3FY17 Q2FY17 Q1FY17 FY17 Select Balance Sheet Items Cash, cash equivalents and short-term investments $ 2,532 $ 2,026 $ 2,314 $ 4,256 $ 5,582 $ 5,619 $ 6,118 $ 4,256 Deferred revenue 2,730 2,514 2,794 2,787 2,473 2,487 2,417 2,787 Debt 5,587 6,209 6,202 8,186 7,138 7,176 3,204 8,186 Select Cash Flow Items Operating activities: Net cash provided by (used in) operating activities (1) $ 294 $ 177 $ 213 $ 355 $ 148 $ 58 $ (770) $ (209) Investing activities: Additions to property and equipment (33) (25) (47) (13) (18) (17) (22) (70) Payments for acquisitions, net of cash acquired (41) (353) (8) (2,203) - (4,533) - (6,736) Proceeds from divestiture, net of cash contributed (2) 946 - - - - - 7 7 Other (202) (202) 1-2 1 30 33 Net cash provided by (used in) investing activities 670 (580) (54) (2,216) (16) (4,549) 15 (6,766) Financing activities: Repayments of debt and other obligations (630) - (2,010) (45) (45) - (17) (107) Proceeds from issuance of debt, net of issuance costs - - - 1,076 (6) 4,005 994 6,069 Dividends and dividend equivalents paid (49) (48) (66) (49) (53) (52) (68) (222) Repurchases of common stock - - - (500) - - - (500) Other (5) (27) (50) 27 (12) 38 (13) 40 Net cash provided by (used in) financing activities $ (684) $ (75) $ (2,126) $ 509 $ (116) $ 3,991 $ 896 $ 5,280 Effect of exchange rate fluctuations on cash and cash equivalents 26 8 26 24 (51) 2 (16) (41) Change in cash and cash equivalents 306 (470) (1,941) (1,328) (35) (498) 125 (1,736) Headcount Worldwide employees 11,817 12,769 12,822 13,214 12,567 12,766 11,133 13,214 (1) We adopted ASU 2016-09 Stock-Compensation in Q1 FY18. As part of the adoption of this ASU, prior period excess income tax benefits from the exercise of stock options have been reclassified from financing activities to operating activities to conform with the FY18 presentation. (2) In addition to the cash proceeds received in the divestiture of our WSS and PKI solutions, we received shares of common stock representing an approximate 28% equity interest of DigiCert valued at $160 million. 11

SYMANTEC CORPORATION Forward-Looking Statements This commentary contains statements which may be considered forward-looking within the meaning of the U.S. federal securities laws, including the information contained under the caption Reconciliation of GAAP to Non-GAAP Revenue Guidance Detail and the statements regarding Symantec s other projected financial and business results, including demand for its products and services, Symantec s enhanced capabilities, and Symantec s continued cost and operating efficiencies. These statements are subject to known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to differ materially from results expressed or implied in this commentary. Such risk factors include those related to: our ability to continue to integrate and fully achieve the expected benefits from acquired businesses; general economic conditions; fluctuations and volatility in Symantec s stock price; the ability of Symantec to successfully execute strategic plans; the ability to maintain customer and partner relationships; the ability of Symantec to achieve its cost and operating efficiency goals; the anticipated growth of certain market segments; Symantec s sales pipeline and business strategy; fluctuations in tax rates and foreign currency exchange rates and the impact of the recently enacted tax reform legislation; the impact related to Symantec s future adoption of the new revenue and other accounting standards; the timing and market acceptance of new product releases and upgrades; and the successful development of new products and the degree to which these products gain market acceptance. Actual results may differ materially from those contained in the forwardlooking statements in this commentary. Symantec assumes no obligation, and does not intend, to update these forward-looking statements as a result of future events or developments. Additional information concerning these and other risk factors is contained in the Risk Factors sections of Symantec s Form 10-K for the fiscal year ended March 31, 2017, filed with the SEC on May 19, 2017 and Symantec s Form 10-Q for the fiscal period ended December 29, 2017 expected to be filed with the SEC on February 2, 2018. 12

SYMANTEC CORPORATION Explanation of Non-GAAP Measures Objective of non-gaap measures: We believe our presentation of non-gaap financial measures, when taken together with corresponding GAAP financial measures, provides meaningful supplemental information regarding the Company s operating performance for the reasons discussed below. Our management team uses these non-gaap financial measures in assessing Symantec s performance, as well as in planning and forecasting future periods. Due to the importance of these measures in managing the business, we use non-gaap measures in the evaluation of management s compensation. These non-gaap financial measures are not computed according to GAAP and the methods we use to compute them may differ from the methods used by other companies. Non-GAAP financial measures are supplemental and should not be considered a substitute for financial information presented in accordance with GAAP and should be read only in conjunction with our consolidated financial statements prepared in accordance with GAAP. Our non-gaap measures include: Non-GAAP revenues Non-GAAP cost of revenues, gross margin and gross margin percentage Non-GAAP operating expenses Non-GAAP operating income, and operating margin Non-GAAP interest expense Non-GAAP pre-tax income Non-GAAP provision for income taxes Non-GAAP net income Non-GAAP EPS Non-GAAP revenues in constant currency and growth Organic growth in constant currency Non-GAAP deferred revenue Implied billings Deferred revenue adjustment: Our non-gaap net revenues eliminate the impact of deferred revenue purchase accounting adjustments required by GAAP. GAAP requires an adjustment to the liability for acquired deferred revenue such that the liability approximates how much we, the acquirer, would have to pay a third party to assume the liability. We believe that eliminating the impact of this adjustment improves the comparability of revenues between periods. Also, although the adjustment amounts will never be recognized in our GAAP financial statements, we do not expect the acquisitions to affect the future renewal rates of revenues excluded by the adjustments. In addition, our management uses non-gaap net revenues, adjusted for the impact of purchase accounting adjustments to assess our operating performance and overall revenue trends. Nevertheless, non-gaap net revenues has limitations as an analytical tool and should not be considered in isolation or as a substitute for GAAP net revenues. We believe these adjustments are useful to investors as an additional means to reflect revenue trends of our business. However, other companies in our industry may not calculate these measures in the same manner which may limit their usefulness for comparative purposes. Inventory fair value adjustment: Purchase accounting requires us to measure acquired inventory at fair value. The fair value of inventory reflects the acquired company s cost of manufacturing plus a portion of the expected profit margin. These non-gaap adjustments to our cost of revenues exclude the expected profit margin component that is recorded under purchase accounting associated with our acquisitions. We believe the adjustments are useful to investors as an additional means to reflect cost of revenues and gross margin trends of our business. Stock-based compensation: This consists of expenses for employee restricted stock units, performance based awards, bonus share programs, stock options and our employee stock purchase plan, determined in accordance with GAAP. We evaluate our performance both with and without these measures because stock-based compensation is a non-cash expense and can vary significantly over time based on the timing, size, nature and design of the awards granted, and is influenced in part by certain factors that are generally beyond our control, such as the volatility of the market value of our common stock. In addition, for comparability purposes, we believe it is useful to provide a non-gaap financial measure that excludes stock-based compensation to facilitate the comparison of our results to those of other companies in our industry. Amortization of intangible assets: Amortization of intangible assets consists of amortization of acquisition-related intangibles assets such as developed technology, customer relationships and trade names acquired in connection with business combinations. We record charges relating to the amortization of these intangibles within both cost of revenues and operating expenses in our GAAP financial statements. Under purchase accounting, we are required to allocate a portion of the purchase price to intangible assets acquired and amortize this amount over the estimated useful lives of the acquired intangible assets. However, the purchase price allocated to these assets is not necessarily reflective of the cost we would incur to internally develop the intangible asset. Further, amortization charges for our acquired intangible assets are inconsistent in size and are significantly impacted by the timing and valuation of our acquisitions. We eliminate these charges from our non-gaap operating results to facilitate an evaluation of our current operating performance and provide better comparability to our past operating performance. Restructuring, transition and other costs: Restructuring charges are costs associated with a formal restructuring plan and are primarily related to employee severance and benefit arrangements. Other charges include facilities and other exit and disposal costs, including asset write-offs. Transition costs are associated with formal discrete strategic information technology initiatives and primarily consist of consulting charges associated with our enterprise resource planning and supporting systems and costs to automate business processes. 13

SYMANTEC CORPORATION Explanation of Non-GAAP Measures In addition, transition costs include expenses associated with our divestitures. We exclude restructuring, transition and other costs from our non-gaap results as we believe that these costs are incremental to core activities that arise in the ordinary course of our business and do not reflect our current operating performance, and that excluding these charges facilitates a more meaningful evaluation of our current operating performance and comparisons to our past operating performance. Acquisition-related costs: These represent the transaction and business integration costs related to significant acquisitions that are charged to operating expense in our GAAP financial statements. These costs include incremental expenses incurred to affect these business combinations such as advisory, legal, accounting, valuation, and other professional or consulting fees. We exclude these cost from our non-gaap results as they have no direct correlation to the operation of our business, and because we believe that the non- GAAP financial measures excluding these costs provide meaningful supplemental information regarding the spending trends of our business. In addition, these costs vary, depending on the size and complexity of the acquisitions, and are not indicative of costs of future acquisitions. Non-cash interest expense and amortization of debt issuance costs: In accordance with GAAP, we separately account for the value of the conversion feature on our convertible notes as a debt discount that reflects our assumed non-convertible debt borrowing rates. We amortize the discount and debt issuance costs over the term of the related debt. We exclude the difference between the imputed interest expense, which includes the amortization of the conversion feature and of the issuance costs, and the coupon interest payments because we believe that excluding these costs provides meaningful supplemental information regarding the cash cost of our convertible debt and enhance investors ability to view the Company s results from management s perspective. Gain on divestiture: We recognized a gain in the third quarter of fiscal 2018 as a result of our divestiture of our WSS and PKI solutions. We have excluded this gain for purposes of calculating our non-gaap results. We believe making these adjustments facilitates a better evaluation of our current operating performance and comparisons to past operating results. Income tax effects and adjustments: In the third quarter of fiscal 2018, we revised our estimated annual effective non-gaap tax rate to reflect a change in the federal statutory rate as a result of U.S. income tax reform. The federal statutory rate change is effective January 1, 2018, and therefore, will require us to use a blended statutory rate of 31.58% for our fiscal year 2018. As a result, we recognized a reduction in our effective tax rate in the third quarter of fiscal 2018. Effective in the third quarter of fiscal 2018, we have applied an effective tax rate of 26.8% to our year to date pre-tax income, after the elimination of the effects of the non-gaap adjustment to our operating results described above. For purposes of calculating non-gaap measures, we also excluded from the non-gaap tax provision the one-time provisional benefit of $810 million, which reflects the adjustments to income tax expense related to the discrete effects of the U.S. reform. This includes (1) the benefit of $1.4 billion reduction in previously accrued deferred income tax liability for foreign earnings and (2) the benefit of $200 million of other adjustments to our deferred income taxes, partially offset by (3) $821 million of tax expense that was recorded for the one-time transition tax on our previously untaxed foreign earnings. Through the second quarter of fiscal 2018, we used a projected long-term non-gaap tax rate in order to provide better consistency across the interim financial reporting periods. Our non-gaap tax rate for fiscal year 2017 and the first two quarters of fiscal 2018 was 28.7% and 29.5%, respectively. The long-term projected non-gaap tax rates reflected the elimination of the effects of the non-gaap adjustments to our operating results described above and significant discrete items, as well as certain unique GAAP reporting requirements under discontinued operations as a result of the sale of Veritas. We believe making these adjustments facilitates a better evaluation of our current operating performance and comparisons to past operating results. Our tax rate is subject to change for a variety of reasons, such as significant changes in the geographic earnings mix due to acquisition and divestiture activities or fundamental tax law changes in major jurisdictions where we operate. Discontinued operations: In August 2015, we entered into a definitive agreement to sell the assets of our information management business ( Veritas ) to Carlyle. The transaction closed on January 29, 2016. The results of Veritas are presented as discontinued operations in our Consolidated Statements of Operations and thus have been excluded from non-gaap net income and segment results for all reported periods. Diluted GAAP and non-gaap weighted-average shares outstanding: Diluted GAAP and non-gaap weighted-average shares outstanding are the same, except in periods that there is a GAAP loss from continuing operations. In accordance with GAAP, we do not present dilution for GAAP in periods in which there is a loss from continuing operations. However, if there is non-gaap net income, we present dilution for non-gaap weighted-average shares outstanding in an amount equal to the dilution that would have been presented had there been GAAP income from continuing operations for the period. Non-GAAP constant currency revenues and growth: We define non-gaap constant currency revenues as total revenues excluding the impact of foreign exchange rate movements, and we use it to determine the constant currency revenue growth on year-on-year basis. Non-GAAP constant currency revenues are calculated by translating current quarter revenues using prior period exchange rates and constant currency revenue growth (expressed as a percentage) is calculated by determining the increase in current quarter non-gaap constant currency revenues over prior period revenues. We believe that constant currency revenues and growth facilitates the assessment of our underlying revenue trends. Organic growth in constant currency: We define organic growth as non-gaap constant currency revenue, adjusted to include revenue from our acquired businesses as if there were present in all periods presented but to exclude revenue attributable to divested businesses or product lines not consider discontinued operations as if they were divested in all periods presented ( adjustments for acquisitions and 14

SYMANTEC CORPORATION Explanation of Non-GAAP Measures divestitures ), divided by the year ago revenue adjusted for the same items. We believe that organic growth in constant currency facilitates a better evaluation of the underlying growth trends in our business and comparisons to past operating results. Deferred revenue: Our non-gaap deferred revenue eliminates the impact of purchase accounting adjustments required by GAAP, and includes pre-acquisition deferred revenue balance of acquisitions for comparability purposes. Additionally, our non-gaap deferred revenue eliminates the impact of deferred revenue associated with the Veritas discontinued operations remaining on our balance sheet at each period end, and adjusts for the historical deferred revenue related to divestitures. We believe that eliminating these impacts improves the comparability of deferred revenue between periods. Our management uses non-gaap deferred revenue to assess our operating performance and to facilitate forecasting future revenues. Nevertheless, non-gaap deferred revenue has limitations as an analytical tool and is not an indicator of future revenues and should not be considered in isolation or as a substitute for GAAP deferred revenue. Our calculation of non-gaap deferred revenue may be different from other companies in our industry, some of which may not use non-gaap deferred revenue, may calculate it differently, or may use other financial measures to evaluate their performance, all of which could reduce the usefulness of non-gaap deferred revenue as a comparative measure. We compensate for these limitations by providing a reconciliation of deferred revenue calculated in accordance with GAAP to the corresponding non-gaap measure. Implied billings: We define implied billings as total revenue plus the change in adjusted deferred revenue. The change in deferred revenue excludes deferred revenue acquired or divested during the period as well as the change in deferred revenue related to discontinued operations that does not amortize to revenue from continuing operations. We consider implied billings to be a useful metric for management and investors because it facilitates an analysis of changes in deferred revenue balances that are an indicator of the health and visibility of our business. There are several limitations related to the use of implied billings versus revenue calculated in accordance with GAAP. First, implied billings include amounts that have not yet been recognized as revenue. Second, our calculation of implied billings may be different from other companies in our industry, some of which may not use implied billings, may calculate implied billings differently, may have different implied billing frequencies, or may use other financial measures to evaluate their performance, all of which could reduce the usefulness of implied billings as a comparative measure. We compensate for these limitations by providing specific information regarding GAAP revenue and evaluating implied billings together with revenue calculated in accordance with GAAP. 15