By Anora Mahmudova and Sara Sjolin, MarketWatch

Biotechnology stocks drop more than 8% since peak last week

U.S. stocks limped out of April, managing to eke out marginal gains in the month after a sharp selloff Thursday.

Losses in the technology and biotechnology sectors, led the main indexes lower, which came under severe selling pressure amid higher-than-usual volumes.

The thumping stocks endured came as a number of economic releases and quarterly reports already had been shaking the market's confidence, a day after the Federal Reserve left open the possibility of an interest rate hike as early as June.

Read: Biotechs undercut key support level (http://www.marketwatch.com/story/biotechs-undercut-key-support-level-2015-04-30)

Brian Fenske, head of sales trading at ITG, said Thursday's trading action just reminds investors that the market can be tumultuous.

"It is probably a combination of events and some earnings over the past few days that has sparked a selloff. Big moves in currency and commodity markets have played a role as did disappointing earnings from Yelp and Twitter," Fenske offered.

The S&P 500 (SPX) lost 21.34 points, or 1%, to 2,085.51, but recorded a 0.9% gain over the month. Tech and health-care stocks were hit the hardest.

The Dow Jones Industrial Average (DJI) dropped 195.01 points, or 1.1%, to 17,840.52, leaving it with a gain of 0.4% over the month and flat year-to-date. During session lows, the blue-chip index briefly turned negative for the year.

Taking the worst of the beaten Thursday was the Nasdaq Composite (RIXF), which sank 82.22 points, shaving 1.6%, to 4,941.42. The tech-heavy index gained 0.8% in April.

The iShares Nasdaq Biotechnology index ETF (IBB) dropped 3.2% and was down more than 8% from its peak reached last Thursday, driving the Nasdaq lower.

Fenske took some comfort in the view that selling hasn't been frenetic. "This selling is not frenzied, it's just a regular down day, which is normal in equity markets," he added.

Thursday's economic data came in above expectations and pointed to improvement in the labor market and further inflation stabilization - both are key gauges of U.S.economic health that the central bank said it would use to help guide its hand as it aims to start normalizing interest rates.

Channing Smith, managing director at Capital Advisors, said recent fluctuations in currency and bond markets have created confusion for equity investors.

"Treasury yields have risen over the past week or so and the euro strengthened rapidly, something that is not quite explainable. Those unusual moves spooked investors, by creating uncertainty," Smith said.

He also pointed to very high valuations despite falling earnings, but said eventually stock prices have to reconcile with the global and domestic economic situation, which is experiencing a slowdown.

(http://www.marketwatch.com/storyno-meta-for-guid)Data:The number of people who applied for U.S. unemployment benefits (http://www.marketwatch.com/story/us-jobless-claims-sink-to-15-year-low-2015-04-30)fell 34,000 to 262,000 in the seven days from April 19 to April 25, the lowest level in 15 years.

The cost of employing the average U.S. worker (http://www.marketwatch.com/story/wages-pick-up-in-the-first-quarter-2015-04-30)climbed 0.7% in the first quarter.

Consumer spending rose a seasonally adjusted 0.4% in March (http://www.marketwatch.com/story/consumer-spending-shows-limited-advance-in-march-2015-04-30). But personal income was flat last month, likely reflecting slower job creation. Inflation, as gauged by the PCE price index, climbed 0.2% in March.

The Chicago PMI jumped in April to a reading of 52.3 from 46.3 in March, to return above the 50-mark signaling expansion. A double-digit gain in the new orders component led to the advance.

Earnings: Shares of LinkedIn Corp.(LNKD) tumbled 20% in after-hours trade Thursday after the company gave a second-quarter and full-year earnings and revenue outlook way below Wall Street expectations.

Shares of Yelp Inc.(YELP) dropped 24% after disappointing quarterly results.

Apple Inc.(AAPL) shares fell 2.7%, extending hefty losses for a second day. A component for Apple Watch supplied by a contractor was found to be defective, disrupting the supply of the new product. Reports also surfaced suggesting that its heart-rate monitor may not work on darker skin.

For more news on Thursday stock movers and shakers please read here (http://www.marketwatch.com/storyno-meta-for-guid).

Other markets: Asian stock markets closed mostly lower (http://www.marketwatch.com/storyno-meta-for-guid), while European benchmarks (http://www.marketwatch.com/storyno-meta-for-guid) were mixed.

Crude-oil prices (CLM5) settled 1.8% higher at $59.63 (http://www.marketwatch.com/story/oil-prices-stay-supported-as-crude-trades-at-year-high-2015-04-30) and gained 25% in April, its largest monthly gains in nearly six years. Gold futures sank 2.3% to $1,182.40 and posted a modest loss for the month. The dollar (DXY) traded mixed against other major currencies (http://www.marketwatch.com/storyno-meta-for-guid).

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