What's better than momentum? Mo' momentum.

Let's take a closer look at five of this past week's biggest scorchers.

Company

Aug. 10 Weekly Gain My Watchlist
Millennial Media (NYSE: MM) $13.24 46% Add
Fusion-io (NYSE: FIO) $27.45 41% Add
Universal Display (Nasdaq: PANL) $39.55 28% Add
First Solar (Nasdaq: FSLR) $21.43 26% Add
Zipcar (Nasdaq: ZIP) $8.08 20% Add

Source: Barron's.

Millennial Media soared after posting a narrower loss than Wall Street was expecting. The mobile advertising provider is now serving up ads for developers in more than 35,000 different mobile applications.

Fusion-io came up big after the storage drive maker posted blowout quarterly results and issued inspiring guidance. Fusion-io sees revenue growth of 45%-50% in its new fiscal 2013, well ahead of where the pros were perched.

Universal Display put the "oh" in OLED after the patent-rich lighting pioneer served up robust quarterly results.

First Solar was also a bright star last week. Seeing a solar company post improving results is rare, but seeing one enjoy a boost in profit guidance is even more rare.

Zipcar shares surrendered 39% of their value two weeks ago after posting brutal quarterly results. The leading car-sharing service shifted out of reverse last week, starting to make back some of the ground that it had lost.

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The Motley Fool owns shares of Universal Display, Zipcar, and Fusion-io. Motley Fool newsletter services have recommended buying shares of Zipcar and Universal Display. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.

Longtime Fool contributor Rick Munarriz calls them as he sees them. He does not own shares in any of the stocks in this story, except for Zipcar and Millennial Media. Rick is also part of the Rule Breakers newsletter research team, seeking out tomorrow's ultimate growth stocks a day early.