UK stocks markets wavered on Wednesday after a sell-off the previous session as investors treaded lightly ahead of economic growth data and a policy decision Stateside.London's FTSE 100 was trading 0.04% lower at 7,027.68 by midday with a flurry of mixed corporate earnings to digest from the likes of Barclays, Next, Weir and London Stock Exchange.The index was pausing for breath following a 1% drop on Tuesday after its record-setting close of 7,103.98 to kick off the week.US gross domestic product (GDP) figures are due out at 13:30 BST and are expected to reveal that annualised growth slowed to just 1% in the first quarter from 2.2% in the fourth quarter.The Federal Open Market Committee is then due to announce its vote on monetary policy at 19:00 following a two-day meet-up in Washington, with markets awaiting hints on when the first interest rate increase will be."Following yesterday's disappointing consumer confidence figures, and the expectation of dismal GDP data, the chances of a September rate hike looks increasingly unlikely as the US continues to release the softest of soft data," said analyst Connor Campbell from Spreadex.Earnings come thick and fastBanking group Barclays declined after first-quarter results showed statutory group profits decreased 26% to £1.4bn. However, adjusted profits were up 9% over last year, while the lender's capital buffers improved.High street retailer Next was in fashion after first-quarter sales rose 3.2%, ahead of the 0% to +3% growth guidance given in March. More than half of the rise came from the opening of new space, with warmer weather and an earlier brochure also helping.Antofagasta dropped as the copper miner scaled back its production guidance after first-quarter output was affected by numerous water issues at its Los Pelambres and Centinela projects.British American Tobacco disappointed with a first-quarter update, which revealed that constant-currency revenues were down 5.8% amid a "challenging trading environment".London Stock Exchange rose after saying it made a good start to the year with group revenues up 86% at £581m.Industrial engineer Weir Group jumped after delivering a better-than-expected first quarter from minerals, its largest division. However, the company did say it was "taking further action to support profitability" in its oil and gas division amid tough conditions.Vodafone was performing well after the telecoms stock was upgraded by Berenberg to 'buy'. The broker hiked its target price for the shares from 214p to 270p.Market MoverstechMARK 3,231.41 +0.24%FTSE 100 7,027.68 -0.04%FTSE 250 17,621.57 -0.21%FTSE 100 - RisersWeir Group (WEIR) 1,808.00p +4.03%Next (NXT) 7,390.00p +3.14%Coca-Cola HBC AG (CDI) (CCH) 1,429.00p +2.95%Marks & Spencer Group (MKS) 565.50p +1.89%Vodafone Group (VOD) 233.50p +1.63%Old Mutual (OML) 235.60p +1.55%Hargreaves Lansdown (HL.) 1,242.00p +1.47%International Consolidated Airlines Group SA (CDI) (IAG) 580.00p +1.31%BAE Systems (BA.) 512.00p +1.29%Land Securities Group (LAND) 1,278.00p +1.27%FTSE 100 - FallersAntofagasta (ANTO) 775.50p -3.30%BHP Billiton (BLT) 1,549.50p -2.52%Rio Tinto (RIO) 2,931.50p -1.61%Centrica (CNA) 271.80p -1.27%BP (BP.) 470.40p -1.20%Glencore (GLEN) 311.15p -1.19%British American Tobacco (BATS) 3,632.00p -1.02%Hikma Pharmaceuticals (HIK) 2,100.00p -0.99%Anglo American (AAL) 1,119.50p -0.84%Royal Bank of Scotland Group (RBS) 352.60p -0.73%FTSE 250 - RisersNMC Health (NMC) 701.00p +5.57%Brown (N.) Group (BWNG) 335.00p +4.10%Greggs (GRG) 1,112.00p +3.35%Ocado Group (OCDO) 353.60p +2.17%Poundland Group (PLND) 321.60p +1.90%AO World (AO.) 189.40p +1.83%Man Group (EMG) 206.70p +1.32%Paragon Group Of Companies (PAG) 429.20p +1.27%CLS Holdings (CLI) 1,888.00p +1.23%Hellermanntyton Group (HTY) 340.00p +1.19%FTSE 250 - FallersOphir Energy (OPHR) 161.30p -5.62%Drax Group (DRX) 395.60p -3.37%Premier Oil (PMO) 171.40p -3.22%Indivior (INDV) 193.00p -3.06%Countrywide (CWD) 509.00p -3.05%COLT Group SA (COLT) 143.40p -3.04%Polymetal International (POLY) 535.00p -2.99%Lonmin (LMI) 143.60p -2.91%Jimmy Choo (CHOO) 168.00p -2.83%Vedanta Resources (VED) 628.50p -2.56%