Fastly Mergers and Acquisitions Presentation Deck

Transaction Overview Strategic Rationale Transaction Consideration Expected Closing ■ Significantly broadens Fastly's security portfolio ■ Next-generation security solution for developers, by developers ■ Accelerates adoption of Compute@Edge Attractive financial file, with 85%+ gross Ⓒ2020 Fastly, Inc. ■ $575MM* of Fastly Common Stock $200MM in cash - Expected to close in 2020 Subject to regulatory approval and satisfaction of customary closing conditions * Number of shares based on floating exchange ratio subject to a two-way collar; does not include $50M restricted stock unit retention pool for Signal Sciences employees 3

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