Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of cloud-based software specialist Marketo Inc (NASDAQ: MKTO) sank 11% today after its quarterly results and outlook disappointed Wall Street.

So what: The stock has rebounded sharply in recent months on signs of a bottom-line recovery, but today's Q4 results -- loss widened to $15.5 million -- coupled with downbeat guidance is forcing Mr. Market to quickly sober up. While year-over-year revenue surged 67%, to $28.2 million, gross margin fell 220 basis points sequentially, suggesting that Marketo's competitive edge is becoming increasingly expensive to maintain.

Now what: Management now sees a full-year adjusted loss of $1.09-$1.15 on revenue of $130 million-$135 million, versus Wall Street's view of a $0.82 per-share loss on revenue of $126 million. "Marketers have stepped forward as the stewards of customer experience and lifetime value in their organizations," Chairman and CEO Phil Fernandez said. "As we look into 2014, we are more excited than ever about the opportunities ahead as we continue to earn new customers, expand into our existing customer base, and extend our track record of thought leadership and innovation." Of course, with the stock still up more than 100% from its 52-week lows, and trading at a lofty price-to-sales around 20, I'd wait for an even wider margin of safety before buying into that bullishness.