Updates prices

By Medha Singh and Twesha Dikshit

June 4 (Reuters) - S&P 500 and Nasdaq 100 futures were set to fall at the open on Thursday, as Broadcom's revenue miss pressured chip stocks, while equity investors took a breather after a strong rally to record highs.

Broadcom AVGO.O shares slumped 15% in premarket trading after the chipmaker also stuck to its long-range forecast of $100 billion in sales from its AI chips. The stock has climbed nearly 55% this quarter and could shed nearly $350 billion in market value if losses hold through the session.

"Broadcom is finding that meeting and even slightly beating forecasts is not enough when the market is holding it to such a high standard," said Dan Coatsworth, head of markets at AJ Bell.

Other chipmakers also fell in tandem, with Qualcomm QCOM.O and Advanced Micro Devices AMD.O down about 4% each, while Micron Technology MU.O and Marvell Technology MRVL.O fell around 7%.

The record-setting rally on Wall Street has stalled this week, putting at risk the series of nine straight weekly gains for the S&P 500, as investors weighed a renewed flare-up in hostilities between the United States and Iran.

Although the two sides agreed to a ceasefire in early April, talks to end the war and reopen the Strait of Hormuz have made little progress, threatening to keep oil prices elevated and stoke inflation.

"The shift feels less like a fundamental change in narrative and more like a combination of profit-taking, stretched positioning and a reassessment of geopolitical risks after weeks of almost uninterrupted gains," said Daniela Hathorn, senior market analyst at Capital.com.

At 08:00 a.m. ET, S&P 500 E-minis EScv1 were down 27.5 points, or 0.36% and Nasdaq 100 E-minis NQcv1 were down 355.25 points, or 1.16%.

Dow E-minis YMcv1 were up 414 points, or 0.81%, buoyed by a 3% gain in UnitedHealth UNH.N after Bank of America raised its rating on the healthcare conglomerate's shares to "buy."

Wednesday's ISM survey showed the U.S. services sector expanded in May. Weekly jobless claims data, due later in the day, will be the last economic reading before Friday's broader monthly employment report.

The data will give new Federal Reserve Chairman Kevin Warsh a fresh read on the U.S. labor market as he heads into his first policy meeting this month, at a time when U.S. consumers are under strain from Iran war-driven price pressures.

Traders see a 75% chance of a 25-basis-point rate hike before the end of the year, LSEG data showed.

Federal Reserve Bank of Richmond President Thomas Barkin and San Francisco Fed President Mary Daly are also due to speak on Thursday, among the last appearances before the Fed's pre-meeting blackout period.

Among market movers, CrowdStrike CRWD.O slumped 9.5% after the cybersecurity company reported a rise in its first-quarter operating expenses.

An investor roadshow for Elon Musk-led SpaceX SPCX.O begins on Thursday ahead of its market debut on June 12. It aims to raise $75 billion in a record IPO that would value it at $1.75 trillion and rank it among the top 10 U.S.-listed firms.