Datadog Investor Day Presentation Deck

Appendix - GAAP to Non-GAAP reconciliation ($000's) 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 transactions Add: Other Non-GAAP adj. (1) Non-GAAP R&D expense FY17 $100,761 $24,734 25% 1,160 $23,574 (1) Non-cash benefit related to the release of a non-income tax liability. DATADOG DOG FY18 FY19 $198,077 $362,780 $55,176 28% 1,641 $210,626 $419,769 35% 41% 38,008 101,942 2,836 8,143 (2,344) (2,729) $53,535 $104,640 $172,511 $309,684 - FY21 TTM (Jun-22) $1,365,854 $111,425 31% 7,972 1,157 FY20 $603,466 $1,028,784 $574,031 42% 162,239 10,397 $401,395 39

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