Market Wrap / budget jitters

The Australian share market resumed its sell-off ahead of tonight's budget, with the tech and healthcare sectors the worst performers.The S&P/ASX 200 Index finished 0.3% lower at  8,670 points.Among the tech stocks, Life360 fell 11% after downgrading its user growth guidance for this fiscal year, while WiseTech and Xero also fell.CSL added to its losses, dropping 1.3%, as the brokers slashed ratings and price targets following the biotech's latest profit downgrade. ResMed was caught up in the negativity around healthcare, falling 3.6%.NAB lost 2.4% and led the banks lower.However the materials sector bucked the trend with BHP gaining 3% to finish at a record high, eclipsing CBA to become the largest company on the ASX.DroneShield plunged 11% as ASIC launched an investigation into the sale of shares by company executives.Insurer IAG rose 2.2% as it revealed its 2030 growth strategy. And NAB's business conditions index fell for a fourth straight month in April on rising cost pressures, while ANZ's survey of consumer confidence fell sharply following last week's interest rate hike.