Stocks opened higher to maintain their ascent toward records Monday morning as analysts tied the an upbeat tone to a preliminary U.S.-China trade deal struck last week, though questions remained over the details of the long-awaited “phase one” accord.

What are major indexes doing?

The Dow Jones Industrial Average DJIA, +0.70% advanced 172 points, or 0.6%, to 28,312, on pace to set its first closing all-time high since Nov. 28. The S&P 500 SPX, +0.84% rose 23 points, or 07%, to 3,192. The Nasdaq Composite Index COMP, +1.01% jumped 79 points, or 0.9%, to 8,815. All three main benchmarks set new intraday records on Monday.

Stocks capped a winning week Friday with small gains. The Dow saw a 0.4% weekly advance to end at 28,135.38, while the S&P 500 saw 0.7% rise to end 3,168.80. The Nasdaq logged 0.9% weekly rise, ending at 8,734.88.