(For a Reuters live blog on U.S., UK and European stock

markets, click or type LIVE/ in a news window)

*

Futures off: Dow 0.20%, S&P 500 0.34%, Nasdaq 0.53%

Sept 4 (Reuters) - Futures tied to Wall Street's main

indexes slipped ahead of labor data expected later on Wednesday

as worries lingered about the health of the U.S. economy.

Wall Street's main indexes logged their biggest one-day loss

since early August on Tuesday after investors dumped

technology-related stocks in a dour start to what has been a

historically weak month for U.S. equities.

The risk-off mood was exacerbated by data that showed

manufacturing activity remained in contractionary territory,

nearly a month after signs of softening labor demand sparked a

global market rout.

Traders now await July's Job Openings and Labor Turnover

Survey due at 10 a.m. ET on Wednesday for clues about the size

of the Federal Reserve's expected interest rate cut in

September.

Markets see a 61% chance of the U.S. central bank cutting

interest rates by 25 basis points, according to CME Group's

FedWatch Tool, while that of a 50 bps cut has increased to 39%

from around 31% a day earlier.

Data on July factory orders and the Fed's survey, known as

the "Beige Book", are also expected on Wednesday.

At 05:30 a.m. ET, Dow E-minis were down 82 points,

or 0.20%, S&P 500 E-minis were down 18.75 points, or

0.34%, and Nasdaq 100 E-minis were down 100 points, or

0.53%.

Chip stocks, that have led much of this year's rally on the

prospects of artificial intelligence, fell sharply on Tuesday,

with the Philadelphia SE Semiconductor index falling 7.8%

to notch its steepest one-day drop since the COVID-19 pandemic.

Nvidia ( NVDA ) fell 0.8% in premarket trading on Wednesday

after a report said the U.S. Department of Justice sent a

subpoena to the AI chip firm as it deepens its probe into the

company's antitrust practices.

A 10% slump in the previous session wiped off a record $279

billion from Nvidia's ( NVDA ) market capitalization - the biggest ever

single-day decline in market value for a U.S. company.

Other growth stocks such as Tesla lost 0.8%, Apple ( AAPL )

shed 0.9% and Microsoft ( MSFT ) slipped 0.5%.

Among others, Zscaler ( ZS ) forecast fiscal 2025 revenue

and profit below estimates, sending the cybersecurity company's

shares down 15%.

PagerDuty ( PD ) fell 15.2% after the digital operations

management platform forecast downbeat revenue for the third

quarter, while GitLab ( GTLB ) jumped 17% after the software

development tools provider lifted its annual revenue forecast.