U.S. stock index futures were slightly higher in overnight trading on Wednesday, ahead of the final trading day of the holiday-shortened week.Futures on the Dow Jones Industrial Average advanced 48 points. S&P 500 futures rose 0.12%, while Nasdaq 100 futures advanced 0.08%.The S&P 500 finished Wednesday’s session little changed — rising less than 0.1% — after sliding in the final minutes of trading. Still, the benchmark index did manage to snap a three-day losing streak. The Dow gained 114.32 points, or 0.38%, after rising more than 270 points at one point during the session. The Nasdaq Composite hit a record high, before erasing those gains and closing 0.29% lower.”It was selling in the index-dominating tech names that weighed on the SPX, not broad market weakness,” Adam Crisafulli of Vital Knowledge said in a note. Netflix and Microsoft were among the tech names that declined, falling 2.4% and 1.3%, respectively. The late-day slide came as investors took profits into the end of the year, and as President Donald Trump vetoed a sweeping defense bill. The move came after he called Congress’ $900 billion Covid relief package — months long in the making — an unsuitable “disgrace.” The president took particular issue with the direct payments, which he said should be lifted from $600 to $2,000. House Speaker Nancy Pelosi agreed with Trump’s call for higher payments, and said House Democrats will seek to pass a standalone bill by unanimous consent Thursday.The major averages are mixed heading into the final day of the holiday-shortened week. The Nasdaq is on track to end the week higher, while the Dow and S&P 500 are modestly lower for the week. The Russell 2,000, which hit a new intraday and all-time closing high on Wednesday, is also higher for the week. Amid strength in small cap names, the index is on track for its eighth straight week of gains — the longest weekly winning streak since Feb. 2019.On the data front, U.S. jobless claims totaled 803,000 during the week ending Dec. 19, better than an estimate of 888,000 according to economists polled by Dow Jones. However, core durable goods and personal income both fell short of expectations in November.”Our risk indicators have begun to flash euphoria with sentiment just a tad too bullish,” Jefferies said Wednesday in a note to clients. “Subscribe to CNBC PRO for exclusive insights and analysis, and live business day programming from around the world.