Two stocks that have been getting a lot of investor attention recently are Sirius XM Holdings (NASDAQ: SIRI) and Carnival (NYSE: CCL). These stocks have underperformed the major market indexes this year, but they are notable brands that many investors recognize.

Both are showing improving trends that could lead to sharp rallies in their share prices. Let's take a look at the fundamental catalysts that could benefit shareholders of these companies, and what kind of return to expect if all goes well.

Sirius XM is a very profitable business based on earning recurring revenue from millions of subscribers for its satellite radio service. It has agreements with major automakers that pre-install the service in their vehicles, and this advantage helped Sirius XM gain 33 million subscribers. It also owns Pandora, which has around 6 million subscribers.

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Source Fool.com