* Freddie Mac posts loss, to slash dividend
* Oil below $120/bbl, U.S. weekly data on tap
* Cisco optimism may limit pressure on techs (Updates prices)
By Ellis Mnyandu
NEW YORK, Aug 6 (Reuters) - U.S. stocks headed for a lower open on Wednesday after home finance company Freddie Mac <FRE.N> posted its fourth straight quarterly loss and braced for more fallout from the U.S. housing slump.
The news from Freddie Mac dealt investors a blow a day after Wall Street had its biggest one day advance in four months. Shares of Freddie Mac fell 19 percent before the bell while its bigger rival, Fannie Mae <FNM.N>, slid 15 percent. The two home finance companies, known as government-sponsored enterprises, have been pummeled by the housing downturn.
Some investors, doubting stocks will sustain gains, could book profits after Tuesday's broad surge, the biggest in four months on a drop in oil to three-month lows and hints from the Federal Reserve it will be in no rush to raise interest rates.
"I think we're probably headed for some sort of a pullback," said Peter Cardillo, chief market economist at Avalon Partners in New York.
"We know that the situation in the credit markets is still very much precarious and that we're probably going to see more negative news coming out of there, but there's a feeling that a lot of the financial institutions are not going to go belly up."
S&P 500 futures <SPc1> fell 2.90 points and were below fair value, a formula that evaluates pricing taking into account interest rates, dividends and time to expiration on the contract.
Dow Jones industrial average futures <DJc1> were off 47 points, but Nasdaq 100 <NDc1> futures rose 4 points.
U.S. crude oil prices edged lower, slipping 12 cents to $119.07 a barrel. Weekly U.S. oil inventory data is due at 10:35 a.m. (1435 GMT).
Freddie Mac also doubled its reserves for losses on delinquent loans and home foreclosures. Shares of Freddie Mac fell to $6.50 before the bell after it reported an $821 million loss and announced a plan to slash its dividend. For details, see [
]. Fannie's stock fell to $11.57 before the bell.Last month fears that the two companies, critical players in the U.S. housing market, faced capital constraints roiled markets and resulted in a sweeping rescue effort by Washington to bolster their finances.
Even so, optimism fueled by Cisco Systems Inc's <CSCO.O> comments that the network equipment maker expected the weak economic environment to be relatively short term could offset any downside pressure on the technology front. [
]Cisco shares were up 5.4 percent at $23.87 before the bell.
According to Thomson Reuters chart data, the benchmark S&P 500 <.SPX> will start Wednesday's trading at its most overbought in two months, according to its 14-day relative strength index. (Editing by Kenneth Barry)