Magnite Investor Presentation — November 2019

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Financial Highlights

Copyright Rubicon Project 2019

2FORWARD -LOOKING STATEMENTS

This presentation and management's prepared remarks during the conference call referred to above include, and management's an swers to questions during the conference call may include, forward -looking statements,

including statements based upon or relating to our expectations, assumptions, estimates, and projections. In some cases, you canidentify forward -looking statements by terms such as "may," "might," "will," "objective,"

"intend," "should," "could," "can," "would," "expect," "believe," "design," "anticipate," "estimate," "predict," "potential," "plan" or the negative of these terms, and similar expressions. Forward -looking statements may include,

but are not limited to, statements concerning our anticipated financial performance, including, without limitation, revenue, advertising spend, non -GAAP loss per share, profitability, net income (loss), Adjusted EBITDA,

earnings per share, and cash flow; strategic objectives, including focus on header bidding, mobile, video, Demand Manager, an d private marketplace opportunities; investments in our business; development of our

technology; introduction of new offerings; the impact of transparency initiatives we may undertake; the impact of our traffic shaping technology on our business; the effects of our cost reduction initiatives; scope and duration

of client relationships; the fees we may charge in the future; business mix and expansion of our mobile, video and private ma rketplace offerings; sales growth; client utilization of our offerings; our competitive differentiation;

our market share and leadership position in the industry; market conditions, trends, and opportunities; user reach; certain s tatements regarding future operational performance measures including ad requests, fill rate, paid

impressions, average CPM, take rate, and advertising spend; benefits from supply path optimization; and factors that could af fect these and other aspects of our business. These statements are not guarantees of future

performance; they reflect our current views with respect to future events and are based on assumptions and estimates and subj ectto known and unknown risks, uncertainties and other factors that may cause our actual

results, performance or achievements to be materially different from expectations or results projected or implied by forward -looking statements. These risks include, but are not limited to: our ability to continue to grow and to

manage our growth effectively; our ability to develop innovative new technologies and remain a market leader; our ability to attract and retain buyers and sellers and increase our business with them; our vulnerability to loss