Magnite Investor Presentation — May 2021

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CONFIDENTIAL | © MA GNITE

Financial Highlights

1 CONFIDENTIAL | © MA GNITE

FORWARD-LOOKING STATEMENTS

This presentation and management's prepared remarks during the conference call referred to above include, and management's answers 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 can identify 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 the acquisition of SpotX, Inc. ("SpotX," and such acquisition the "SpotX Acquisition") or the

anticipated benefits thereof; statements concerning potential synergies from the SpotX Acquisition; statements concerning the potential impacts of the COVID-19 pandemic on our business operations, financial condition, and results of operations and on the world

economy; our anticipated financial performance; anticipated benefits or effects related to our completed merger with Telaria, Inc. ("Telaria" and such merger the "Telaria Merger"); strategic objectives, including our focus on connected television ("CTV"), mobile, video,

header bidding, Demand Manager, identity solutions, and private marketplace opportunities; investments in our business; development of our technology; industry growth rates for ad-supported CTV and the shift in video consumption from linear TV to CTV;

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 CTV, mobile, video, and private marketplace 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; certain statements 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 other statements that are not historical

facts. 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 subject to known and unknown risks, uncertainties and other factors that may cause our