Zoominfo Investor Day Presentation Deck

2022 ANALYST DAY > OPPORTUNITY Addressing a Large and Growing Opportunity ZoomInfo's Global TAM Today (5) (6) Latest Earnings Slides as of 12/31/21(2)(3)(4) $12B International Intelligence At IPO (¹) 1. 2. 3. $14B North America Intelligence 4. 5. 6. $40B SalesOS $13B North America Intelligence $11B International Intelligence $18B Conversation Intelligence $24B $6B Data Mgt. $30B OperationsOS $7B Chat $6B $7B Recruiter Engage We calculated our TAM at IPO by estimating the total number of companies by employee size for companies with 1,000 or more employees (enterprise), companies with 100 to 999 employees (mid-market), and companies with 10 to 99 employees (SMBS) and applying the ACV to each respective company using internally generated data of actual customer spendby company size. The aggregate calculated value represents our estimated TAM. Data for numbers of companies by employee count is from our Zoominfo platform that we have identified as relevant prospects for our platform. The ACV applied to the specifically identified number of companies by employee size is calculated by leveraging internal company data on current customer spend, which is concentrated on sales and marketing use cases today. For our companies with 1,000 or more employees, we have applied the average ACV of our top quartile of customers with 1,000 or more employees, who we believe have achieved broader implementation of our platform across their organizations. For companies with 100 to 999 employees and companies with 10 to 99 employees, we have applied an average ACV based on current spend for our customers in these bands. We estimated our TAM most recently reported with our 12/31/21 earnings with the same methodology as per footnote 1 above with the following changes: 1) SMBs sized based on companies 25 to 99 employees, 2) ACV excludes Engage, Everstring and Recruiter as those TAMs are being calculated separately and 3) applying North America and International ACV to applicable company counts by assuming 45% of North America ACV for International enterprise and 75% of North America ACV for mid-market SMBs. Conversation Intelligence assumes 40% of ACV as per footnote 2 for enterprise, and 100% of ACV as per footnote 2 for mid-market and SMBs; Engage assumes 25% of ACV as per footnote 2 for enterprise, mid-market and SMBS; Data Management assumes 33% of ACV as per footnote 2 for enterprise and mid-market only; Recruiter assumes $100K ACV for enterprise (50 reps x $2,000/ rep), $8K ACV for mid-market (4 reps x $2,000/rep), $2K ACV for SMBS (2 reps x $2,000/ rep); Chat assumes 25% of ACV as per footnote 2 for enterprise, mid-market and SMBs. Company counts based on Zoominfo platform as of 5/13/2021; ACV values as of 3/31/2021. We calculated our TAM today by estimating the total number of B2B companies by employee size for companies with 1,000 or more employees (enterprise), companies with 100 to 999 employees (mid-market), and companies with 25 to 99 employees (SMBS) and applying the ACV to each respective company using internally generated data of actual customerspend by company size. The aggregate calculated value represents our estimated TAM. Data for numbers of companies by employee count is from our Zoominfo platform that we have identified as relevant prospects for our platform. The ACV applied to the specifically identified number of companies by employee size is calculated by leveraging internal company dataon current customer spend by persona as we sell today. For our companies with 1,000 or more employees, we have applied the average ACV of the top half of customers with 1,000 or more employees, who we believe have achieved broader implementation of our platform across their organizations. For companies with 100 to 999 employees and companies with 25to 99 employees, we have applied an average ACV based on current spend for our customers in these bands. Note we have applied a haircut for International ACV to applicable company counts by assuming 45% of North America ACV for International enterprise and 75% of North America ACV for mid-market and SMBs. Company counts based on Zoominfo platform as of 3/31/2022; ACV values as of 12/31/2021. Z zoominfo $20B Marketingos $70B $10B TalentOS $100B

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