(For faster updates on individual market-movers, Eikon users please use search string "STXBZ US"; for the Day Ahead newsletter, link.reuters.com/mex49s; for the Morning News Call newsletter, link.reuters.com/nex49s) U.S. stocks rose more than 1 percent in early trading on Wednesday, rebounding from steep losses a day earlier, after fresh intervention from China to support its markets helped ease a global equities selloff. The Dow Jones industrial average was up 1.05 percent at 16,227.05, the S&P 500 was up 0.89 percent at 1,930.92 and the Nasdaq Composite was up 1.18 percent at 4,690.958.
** HEARTWARE INTERNATIONAL INC, $66.76, -18.40 pct
The medical device maker says it will buy heart device maker Valtech Cardio
Raymond James, BTIG Research cut ratings on HeartWare stock, while Sterne Agee CRT and Piper Jaffray cut price target. "We sense investors would have preferred focus on near-term results and maybe being acquired rather than starting new trials," BTIG analysts write.
** ARIAD PHARMACEUTICALS INC, $7.53, -17.21 pct
Baxalta Inc, recently spun off from from Baxter International Inc, has abandoned its pursuit of Ariad, Bloomberg reported.
** AMBARELLA INC, $79.1312, -11.69 pct
** GOPRO INC, $39.87, -8.74 pct
Ambarella, a video processing chipmaker, forecast third quarter revenue of $90 mln-$93 mln, largely below analysts' average estimate of $92.3 mln.
Morgan Stanley analysts expects GoPro to reduce inventory between now and year-end, and thinks Ambarella's biggest customer in security drew down inventory in July quarter because of China uncertainties.
** SYNERGETICS USA INC, $6.57, +49.66 pct
Canada's Valeant Pharmaceuticals International Inc to commence tender offer to buy Synergetics for $6.50 per share
Synergetics shareholders to receive additional cash payments of up to $1 per share if certain sales milestones are reached.
** VERA BRADLEY INC, $12.87, +23.39 pct
The handbag and accessories maker reported better-than-expected Q2 revenue, helped by new products and marketing. Also forecasts Q3 earnings from continuing operations and revenue above analysts' estimates.
** BIONDVAX PHARMACEUTICALS LTD, $4.4, +26.07 pct
The company says the National Institute of Allergy and Infectious Diseases (NIAID) intends to begin a new mid-stage trial of its universal flu vaccine, codenamed M-001, for a strain of avian flu.
Says trial, in collaboration with BiondVax, is to be conducted in the U.S. in 2015-16
** ISLE OF CAPRI CASINOS INC, $19.86, +12.27 pct
The casino operator posted higher-than-expected first-quarter profit, helped by revenue growth at its Florida, Colorado and Missouri casino.
** UNILIFE CORP, $1.49, +27.35 pct
The injections and insulin patch pumps maker has hired Morgan Stanley to help review strategic alternatives, including a sale, after receiving interest from a possible buyer
** FRESH MARKET INC, $22.15, +4.68 pct
Fresh Market named Richard Anicetti CEO on Tuesday, after a search that lasted more than 8 months
Anicetti has more than 30 years of experience in retail and has worked at supermarket chain Hannaford Brothers Co and grocery store chain Food Lion LLC, a unit of Delhaize Group SA .
** BAZAARVOICE INC, $4.9, -5.41 pct
Morgan Stanley analysts cut their rating on the stock to "equal weight", according to Benzinga.com
Now, 5 of 8 brokerages rate the stock "buy" or higher, while the rest rate it "hold".
** TUPPERWARE BRANDS CORP, $51.82, +5.65 pct
The company said third-quarter sales in local currency toward high-end of its July forecast
** REPUBLIC AIRWAYS, $2.28, -24.75 pct
Republic Airways shares plunge as pilot contract talks hit new roadblock, triggering bankruptcy fears.
International Brotherhood of Teamsters (IBT) backs local pilot union's move to not put the carrier's "last, best and final" contract offer to ratification vote.
** NAVISTAR INTERNATIONAL CORP, $16.44, -5.30 pct
Truck and engine maker Navistar International Corp said it could face enforcement from the U.S. Securities and Exchange Commission, and posted its 12th quarterly loss in a row, hurt by restructuring and product warranty costs.
** DIGITAL ALLY INC, $7.43, -5.59 pct
** TASER INTERNATIONAL INC, $24.13, +7.24 pct
Taser says the U.S. Patent and Trademark Office rejected all 20 of Digital Ally's patent claims. Patent relates to technology to detect when a video recorder starts recording and to communicate with any recording device in range. Digital Ally has until Oct. 17 to file response with PTO.
** ENTEROMEDICS INC, $0.3281, +20.63 pct
The medical device maker said its experimental obesity treatment reduced excess weight by 34 percent in patients in a pivotal trial and showed major improvements in obesity-related risk factors. The treatment, called vBloc Neurometabolic Therapy, blocks transmission of messages involving food intake and processing between brain and stomach using a pacemaker-like implant.
** TOWER SEMICONDUCTOR, $12.77, +8.50 pct
Israeli specialty chip manufacturer TowerJazz and its joint venture with Panasonic have developed radio frequency (RF) technology that can improve battery life and boost data rates in fourth generation (4G) smartphones.
** WIX.COM LTD, $19.87, +5.13 pct
Deutsche Bank raised its rating on the website builder's stock to "buy," according to Theflyonethewall.com.
With the upgrade, all 10 brokerages now covering the stock rate it "buy" or higher, according to Thomson Reuters data.
** OPKO HEALTH INC, $11.25, +4.07 pct
** TESARO INC, $55, +6.40 pct
The U.S. Food and Drug Administration approved Tesaro Inc's treatment for chemotherapy-induced nausea and vomiting in adults, the company said on Wednesday.
Tesaro licensed Rolapitant from Opko Health Inc in December 2010, giving it worldwide rights to develop and market the therapy.
** CIVEO CORP, $1.99, +6.99 pct
Sterne Agee CRT becomes second brokerage to rate the stock "buy". Analysts believe that liquidity concerns around Civeo are overblown. "We believe the shares are worth at least $4 per share as liquidity worries dissipate," they wrote in a note.
** KRATOS DEFENCE AND SECURITY SOLUTIONS INC, $4.64, +4.27 pct
The defense and security equipment maker said its subsidiary Micro Systems Inc has been awarded a $3.8 mln contract from Raytheon Missile Systems to provide radar tracking transponders for the AMRAAM missile. (Compiled by Amrutha Penumudi in Bengaluru; Edited by Don Sebastian)