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 Sanmina-SCI (Nasdaq: SANM) plunged today by as much as 18% after the company reported earnings and weak guidance.

So what: Second-quarter revenue added up to $1.46 billion, with adjusted earnings per share of $0.27. The top line was a tad shy of the $1.51 billion consensus estimate, while the bottom line was right on target with the Street's expectations.

Now what: Guidance was the real culprit to the plunge, as Sanmina-SCI sees third-quarter revenue in the range of $1.48 billion and $1.53 billion, with adjusted earnings per share between $0.26 and $0.32. That profit forecast is well below the market's estimate of $0.37 per share. CEO Jure Sola said the company remains hopeful to see improvements during the second half of the calendar year.

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Fool contributor Evan Niu holds no position in any company mentioned. Check out his holdings and a short bio. The Motley Fool has a disclosure policy. We Fools don't 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.