Stockpickr Lists: Infinera

Editor's Note: In this feature from Stockpickr, we highlight lists of stocks that have made new highs, lows or seen other unusual activity.

Biggest % Gainers: Thursday's market selloff did not stand in the way of Infinera's(INFN Quote) initial public offering, as shares rocketed 52% on their first day of trading. The Sunnyvale, Calif.-based chipmaker soared from its offering price of $13, rising $6.70 to $19.70.

Biggest % Losers: Santa Ana's SRS Labs(SRSL Quote) sank 25% Thursday, falling $3.68 to $11.45. Though it's unclear what triggered the downslide, last week the provider of surround sound technology announced the formal award of a patent designed to cover its SRS TruSurround audio enhancement technology.

Rising on Unusual Volume: PriceSmart(PSMT Quote) climbed 12% after the San Diego-based discount retailer said it increased May same-store sales by 21%, with total revenue gaining 22%. Shares traded more than three times average volume, and the stock closed $2.44 higher, at $22.71.

52-Week Highs: DynCorp International(DCP Quote) surged 23% to an all-time high of $20.70 on Thursday, after the defense contractor posted fourth-quarter earnings that shattered analysts' expectations. The Falls Church, Va.-based company also said it expected full-year 2008 profit to more than double. On the news, CIBC World Markets raised its rating of DynCorp to sector outperformer, from sector performer.

52-Week Lows: Volt Information Sciences(VOL Quote) fell 16%, landing at a 52-week low after the staffing-services company posted second-quarter earnings that missed estimates. The company blamed the low results on "timing of certain contracts of the computer system segment's international division." Shares dropped $3.99 to $21.41.

Stocks with Unusual Option Activity: Los Gatos, Calif.'s Netflix(NFLX Quote) was experiencing unusual options activity. Rumors are stirring that the online movie rental company could be taken over by Amazon.com. On Thursday, trading shares elevated 5.9%, or $1.33, closing at $23.93.

Latest Activist Situations: Karsch Capital, a 9.3% shareholder of CSK Auto(CAO Quote), demanded that the company either consider a sale or hire a new executive team, according to a regulatory filing Thursday. Shares closed up 19 cents, or 1%, at $18.22.

Forum of the Day

What will be the effect of Apple's(AAPL Quote) iPhone release on June 29? steven k welcomes advice.

Do You Know the Answer?

daufisland asks, What is the best pure natural gas bet in favor of higher natural gas prices come September?

Feeling Lucky?

And finally, try picking a random portfolio suited to do-it-yourselfers with more detailed analysis at I'm Feeling Lucky.