(CNBC) U.S. stocks closed down on Friday, ending the week significantly higher, amid continued concerns over Greece and a strong jobs report that renewed the possibility of an earlier Fed rate hike.
The S&P downgraded its rating on Greece to "B-" from "B."
"That downgrade in Greece is basically causing a little profit-taking here," said Peter Cardillo, chief market economist at Rockwell Global Capital. "Markets have been up strongly all week."
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