(Reuters) -U.S. stock index futures edged higher on Friday as Treasury yields extended declines from the previous session after recent weak economic data supported bets of a dovish pivot by the Federal Reserve next year. The S&P 500 and the Nasdaq eked out marginal gains on Thursday as Treasury yields fell after higher-than-expected jobless claims data underscored market expectations that interest rates have peaked. Pressuring futures for the tech-heavy Nasdaq, Applied Materials shares lost 7.2% on news that the semiconductor equipment maker was under investigation.