Datadog Investor Presentation Deck

GAAP to Non-GAAP reconciliation Operating expenses and operating profit ($000s) FY17 $100,761 Revenue RESEARCH & DEVELOPMENT GAAP R&D expense GAAP R&D expense as a % of revenue Less: Share-based compensation expense Less: Employer payroll taxes on employee stock Insactions Add: Other Non-GAAP adj.(1¹) Non-GAAP R&D expense Non-GAAP R&D expense as a % of revenue SALES & MARKETING GAAP S&M expense GAAP S&M expense as a % of revenue Less: Share-based compensation expense Less: Amortization of acquired intangibles Less: Employer payroll taxes on employee stock transactions Add: Other Non-GAAP adj. (1) Non-GAAP S&M expense Non-GAAP S&M expense as a % of revenue GENERAL & ADMINISTRATIVE GAAP G&A expense GAAP G&A expense as a % of revenue Less: Share-based compensation expense Less: Employer payroll taxes on employee stock transactions Add: Other Non-GAAP adj. (1) Non-GAAP G&A expense Non-GAAP G&A expense as a % of revenue Reconciliation of operating income and operating margin GAAP operating (loss) income Add: Stock-based compensation expense Add: Amortization of acquired intangibles Add: Employer payroll taxes on employee stock transactions Less: Other Non-GAAP adj. (1) Non-GAAP operating income GAAP operating margin Non-GAAP operating margin (1) Non-cash benefit related to the release of a non-income tax liability DATADOG $24,734 25% 1,160 $23,574 23 % $44,213 44% 977 $43,236 43% $11,356 11% 819 $10,537 10% $(2,956) 3,068 484 $596 (3)% 1% FY18 $198,077 $55,176 28 % 1,641 $53,535 27% $88,849 45 % 1,910 $86,939 44% $18,556 9% 1,406 $17,150 9 % $(11,033) 5,244 511 $(5,278) (6)% (3)% FY19 $362,780 $111,425 31 % 7,972 1,157 (2,344) $104,640 29% $146,657 40 % 5,538 284 (397) $141,232 39 % $35,889 10% 4,942 19 (2,266) $33,194 9% $(20,140) 19,034 752 1,460 (5,007) $(3,901) (6)% (1)% FY20 $603,466 $210,626 35 % 38,008 2,836 (2,729) $172,511 29 % $213,660 35 % 20,467 3,756 (449) $189,886 31% $62,756 10 % 14,105 839 (2,383) $50,195 8% $(13,773) 74,374 943 7,618 (5,561) $63,601 (2)% 11% FY21 $1,028,784 $419,769 41 % 101,942 8,143 $309,684 30 % $299,497 29% 35,035 600 6,349 $257,513 25 % $94,429 9% 22,195 1,248 $70,986 7% $(19,156) 163,737 4,392 16,085 $165,058 (2)% 16 % TTM (Mar-22) $1,193,265 $491,111 41% 130,569 9,669 $350,873 29 % $336,310 28% 42,620 803 6,279 $286,608 24% $99,715 8% 23,054 1,381 $75,280 6% $4,088 201,760 5,653 17,681 $229,182 -% 19 % 24

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