Startups raising money in the Series A stage are usually just a few years old.

But the size of Series A funding rounds has mushroomed in recent years and can now sometimes top $50 million.

One thing all Series A startups have in common is the need to take a proven product idea and give it traction in the marketplace.

That means starting to generate revenue, developing a marketing strategy and building a team that's bigger than just the founders.

Here are the pitch decks that startups have successfully used during the critical Series A funding rounds.

Business Insider regularly interviews startups about fundraising strategies and collects the pitch decks that helped them raise funding.

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