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 circuit board builder TTM Technologies (Nasdaq: TTMI) jumped more than 11% overnight with a large spike in trading volume.

So what: The longtime Stock Advisor recommendation took a look at the ongoing quarter, liked what it saw, and kicked its quarterly guidance up a couple of notches. Both sales and earnings will easily beat the original guidance and Street estimates when TTM files a proper report in mid-February.

Now what: The guidance upgrade rests on high demand, and the market is taking it as a good sign for the circuit board industry as a whole. Fellow quick-turn board maker DDi (Nasdaq: DDIC) is trading more than 4% higher on a generally blah market day and occasional rival Sanmina-SCI (Nasdaq: SANM) is up by 2.5%. But you shouldn't map this turn of events to surging consumer electronics demand, tempting as it may be: TTM's largest customers are defense giants and network equipment specialists.

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