(Updates throughout)
* Futures fall on renewed fears on bank write-downs
* Results from Research in Motion, Nike disappoint
* Jobless claims, existing-home sales on tap
By Richard Leong
NEW YORK, June 26 (Reuters) - U.S. stock futures fell sharply on Thursday, prompted by renewed write-down worries in the banking sector and disappointing financial results from footwear maker NIKE Inc, tech leader Research In Motion and other companies.
Stocks were poised to open lower following gains on Wednesday on the Federal Reserve's decision to leave its benchmark interest rates unchanged. Investors also viewed the Fed's comments as lessening the chances for a rate hike in August.
Shares of Citigroup <C.N> and Merrill Lynch & Co. <MER.N> fell before the opening bell after Goldman Sachs forecast more second-quarter write-downs for the two financial companies as well downgraded their stock ratings.
"We have some pretty negative news this morning in the financial and technology sectors," said Paul Mendelsohn, chief investment strategist at Windham Financial Services in Charlotte, Vermont. "It's really showing how treacherous the market is."
S&P 500 futures <SPc1> were down 11.80 points, below fair value, a mathematical formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract.
Dow Jones industrial average futures <DJc1> were down 99 points, and Nasdaq 100 <NDc1> futures fell 22.25 points lower.
In Europe, stocks were down 1.3 percent, led by a sell-off in banks, while in Asia stocks ended modestly lower.
Goldman also added General Motors Corp <GM.N> to its Americas sell list and cuts its price target.
Belgian-Dutch financial services group Fortis <FOR.AS> <FOR.BR> said it plans to shore up its capital by raising more than 8 billion euros ($12.54 billion).
BlackBerry maker Research In Motion's <RIM.TO> <RIMM.O> stock lost as much as 8 percent in after-hours trading on Wednesday after its profit outlook fell short of market expectations.
Oracle Corp. <ORCL.O> was another drag on the tech sector. The world's No. 3 software company recorded quarterly earnings that exceeded forecasts but offered a cautious outlook.
Shares of NIKE <NKE.N>, the world's biggest athletic shoe and clothes maker, slipped 5 percent on weak orders in the United States.
On the deal front, Anheuser-Busch Cos Inc. <BUD.N> plans to reject InBev NV's <INTB.BR> unsolicited $46.3 billion takeover offer, saying it undervalues the company, a source familiar with the situation told Reuters.
The government will release its weekly reading on jobless claims and a final revision on first-quarter gross domestic products at 8:30 a.m. (1230 GMT). [
]There will be also be more data on housing, which the Fed has cited as a lingering risk to the economy. The National Association of Realtors will report at 10:00 a.m. (1400 GMT) its May figures on home resales following data that showed a 2.5 percent decline in new home sales in May.
U.S. stocks rose on Wednesday after the Fed's rate decision and a drop in oil prices. (Editing by Kenneth Barry)