Shares of the following companies had unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 4 p.m. in New York.
Aetna Inc. (AET US) fell 8.2 percent, the most since April 2009, to $45.31. The third-largest U.S. health insurer reported first-quarter earnings excluding some items of $1.34 a share, falling short of the average analyst estimate of $1.40.
Akamai Technologies Inc. (AKAM US) declined 14 percent, the most since July 28 to $33.15. The operator of a server network said Chief Executive Officer Paul Sagan will leave by the end of 2013.
Alcatel-Lucent SA (ALALF US) slumped 15 percent to $1.64, the lowest price since March 21. France’s largest telecommunications equipment supplier reported a first-quarter loss as sales missed estimates because European clients withheld spending.
Ancestry.com Inc. (ACOM US) gained 5.2 percent to $25.71, the highest price since Feb. 15. The world’s largest online provider of family histories reported first-quarter earnings of 30 cents a share, beating the average analyst estimate of 23 cents.
Arris Group Inc. (ARRS US) rose 7.8 percent, the most since July 28, to $12.61. The maker of Internet equipment forecast second-quarter revenue of at least $330 million, exceeding the average analyst estimate of $313.6 million.
AXT Inc. (AXTI US) sank 15 percent, the most since Oct. 27, to $5.15. The Fremont, California-based maker of products in wireless telecommunications had its rating cut at B Riley & Co. and Northland Securities Inc.
Celgene Corp. (CELG US) fell 6.4 percent, the most since February 2011, to $72.92. The biopharmaceutical company reported first-quarter earnings excluding some items of $1.08 a share, missing the average analyst estimate of $1.13.
Cirrus Logic Inc. (CRUS US) climbed 19 percent to $27.39, the highest price since July 2001. The supplier of parts for Apple’s iPhone and iPad posted fourth-quarter profit of 36 cents a share, beating the 34-cent earnings estimate by analysts on average.
Citrix Systems Inc. (CTXS US) surged 12 percent, the most in the Standard & Poor’s 500 Index, to $86.76. The software maker forecast earnings in 2012 will be at least $2.75 a share, topping the average analyst estimate of $2.72.
Crocs Inc. (CROX US) fell 8.1 percent, the most since Oct. 18, to $20.26. The plastic-clogs maker projected second-quarter adjusted earnings of no more than 63 cents a share, falling short of the 65-cent profit estimated by analysts on average.
Equinix Inc. (EQIX US) rallied 13 percent to $169.28, highest price since at least 2003. The operator of Internet data centers raised its full-year sales forecast and said BT Group Plc (BT/A LN) picked its data centers to provide interconnectivity between trading venues throughout the world’s top financial markets.
Furiex Pharmaceuticals Inc. (FURX US) slumped 23 percent, the second-most in the Russell 2000 Index, to $15.10. The drug company’s partner, Takeda Pharmaceutical Co. (4502 JT), failed to win clearance to sell its new diabetes treatment in the U.S., with regulators asking for more information on the use of the medicine in other countries.
HeartWare International Inc. (HTWR US) rose 12 percent, the most since November 2010, to $77.52. The company’s implantable pump for heart-transplant candidates won the backing of U.S. advisory panel members who said the device would provide dying patients a lifeline.
H&R Block Inc. (HRB US) plunged 11 percent to $14.95 for the third-largest retreat in the S&P 500. The biggest U.S. tax preparer plans to cut 350 jobs and close about 200 company-owned offices as part of a realignment. The Kansas City, Missouri-based company also forecast sales in 2012 will be about $2.9 billion, missing the average analyst estimate of $3.11 billion.
L-3 Communications Holdings Inc. (LLL US) climbed 5.1 percent, the most since January 2011, to $73.59. The maker of military communications and electronics equipment boosted its full-year profit forecast.
Logitech International SA (LOGI US) surged 21 percent, the most since October 2007, to $9.46. The world’s biggest maker of computer mice reported earnings that beat estimates and announced measures including job cuts to save about $80 million a year.
MarineMax Inc. (HZO US) jumped 24 percent, the most since April 2009, to $11.06. The U.S. retailer of recreational boats said same-store sales rose 26 percent in the second quarter.
MetroPCS Communications Inc. (PCS US) slumped 11 percent to $7.08, the lowest price since March 2010. The Richardson, Texas-based pay-as-you-go wireless carrier reported first-quarter earnings and subscriber figures missed estimates.
Smaller rival Leap Wireless International Inc. (LEAP US) plunged 20 percent to $6.14 after reporting a wider loss than analysts expected during the first quarter.
Monster Worldwide Inc. (MWW US) increased 9.7 percent, the most since March 6, to $8.95. The online recruiting service reported first-quarter profit, excluding some items, of 4 cents a share, beating estimates.
Netgear Inc. (NTGR US) jumped 14 percent to $38.49, the highest price since March 28. The maker of modems and routers posted first-quarter sales of $325.6 million, beating the average analyst estimate of $317.3 million.
NII Holdings Inc. (NIHD US) tumbled 23 percent, the most in the Russell 1000 Index, to $14.41. The mobile-phone carrier that sells in Latin America under the Nextel brand said it earned 6 cents a share in the first quarter. Analysts, on average, estimated 22 cents, according to a Bloomberg survey.
Nuance Communications Inc. (NUAN US) rose 9.3 percent, the most since November 2009, to $24.91. The maker of speech-recognition software reported preliminary second-quarter profit and revenue that topped analysts’ estimates.
O’Reilly Automotive Inc. (ORLY US) advanced 6.2 percent to $102.64, the highest price since it went public in 1993. The U.S. auto-parts chain reported first-quarter sales and profit that beat analysts’ estimates.
PulteGroup Inc. (PHM US) gained 10 percent, the most since Dec. 20, to $9.58. The largest U.S. homebuilder by revenue reported a narrower first-quarter loss as it reduced costs and sold houses at higher prices.
Regeneron Pharmaceuticals Inc. (REGN US) rose 9 percent to $138.60, the highest price since at least 1991. The drugmaker increased its 2012 sales forecast for the eye drug Eylea for a second time since February.
Skechers U.S.A. Inc. (SKX US) gained 14 percent, the most since July 28, to $16.96. The maker of Shape-ups toning shoes reported a first-quarter loss of 7 cents a share, narrower than the 27-cent loss predicted by analysts on average.
SolarWinds Inc. (SWI US) advanced 20 percent to $45.38, the highest price since it went public in 2009. The provider of network management software reported earnings that beat the average analyst estimate by 18 percent, according to data compiled by Bloomberg.
TriQuint Semiconductor Inc. (TQNT US) fell 13 percent, the most since Oct. 27, to $4.81. The chipmaker forecast a second-quarter loss of at least 10 cents a share, compared with the 4-cent profit estimated by analysts on average.
United Parcel Service Inc. (UPS US) slipped 1.8 percent, the most since Dec. 8, to $78.25. The world’s largest package-delivery company reported first-quarter profit that trailed analysts’ estimates amid slowing growth in overseas shipping.
Valassis Communications Inc. (VCI US) declined 16 percent, the most since April 2009, to $18.91. The provider of targeted-mail services reported first-quarter earnings of 60 cents a share, missing the average analyst estimate by 10 percent, according to data compiled by Bloomberg.
Varian Medical Systems Inc. (VAR US) slipped 8.9 percent, the most since Aug. 8, to $63.60. The maker of radiation equipment forecast third-quarter profit of no more than 95 cents a share, missing the average analyst estimate of $1.02.
Vasco Data Security Inc. (VDSI US) sank 22 percent, the most since February 2009, to $7.57. The maker of security software said first-quarter earnings and revenue missed the average analyst projection because of the timing of the receipt of new orders and production delays.
Watson Pharmaceuticals Inc. (WPI US) increased 6.8 percent to $74.41, the highest price since it went public in 1993. The Parsippany, New Jersey-based generic-drug maker said it will acquire closely held Actavis Group HF for 4.25 billion euros ($5.62 billion).
Xilinx Inc. (XLNX US) rose 6.8 percent, the most since December 2008, to $36.65. The maker of programmable chips used in mobile-phone base stations forecast sales this quarter that may beat some analysts’ estimates.