DIGITAL MANUFACTURING. REIMAGINED.

EBITDA Calculation ($mm) EBITDA² +Transaction and integration costs +Non-recurring & non-cash items +Compensation normalization -Inventory adjustments +Other adjustments³ Adjusted EBITDA +Impact of Q2 2021 add-ons4 Adjusted EBITDA, incl. Q2 2021 add-ons 然 FY 20201 Q1 2020 Q1 2021 $23.4 $5.8 $4.8 6.3 0.3 2.1 0.9 0.4 0.4 1.0 0.0 0.1 (0.8) 0.0 0.0 0.4 (0.2) 0.7 $31.3 $6.4 $8.1 8.7 2.8 1.8 $39.9 $9.2 $9.8 1 Fathom generated a net loss of $8.0mm on a GAAP basis in FY 2020; 2 Information reflects various adjustments to give pro forma effect to acquisitions completed through March 31, 2021, as though such transactions occurred on January 1, 2020. Adjustments for these transactions resulted in changes to EBITDA and Adjusted EBITDA of $19.3mm, $3.9mm, and ($0.1mm) for FY2020, Q1 2020, and Q1 2021, respectively; 3 Includes other, buy-side and diligence adjustments; 4 Information reflects various adjustments to give pro forma effect to acquisitions completed during Q2 2021, as though such transactions occurred on January 1, 2020. FATHOM Fathom Proprietary and Confidential 37

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