The S&P 500 crossed the 4,000 threshold for the first time Thursday as Wall Street built on a solid March following the rollout of President Joe Biden's infrastructure plan.
The broad equity benchmark rose 1.2% to a fresh record close of 4,019.87. The Dow Jones Industrial Average climbed 171.66 points, or 0.5%, to 33,153.21. The tech-heavy Nasdaq Composite jumped 1.8% to 13,480.11. Alphabet and Netflix jumped more than 3%, while Amazon and Microsoft gained over 2%.
Microsoft shares advanced on news that the software giant will deliver to the U.S. Army more than 120,000 devices based on its HoloLens augmented reality headset. The contract will be worth $21.9 billion over 10 years.
Tech stocks led the gains as bond yields continued to retreat from recent highs. The 10-year Treasury yield fell 7 basis points to around 1.68% Thursday. The benchmark rate hit a 14-month high about 1.77% last week.
The move in stocks came after Biden introduced his multitrillion-dollar infrastructure proposal. The plan includes spending on roads, bridges, green energy and water system upgrades. This marks the second major spending push of Biden's presidency after he signed a $1.9 trillion relief and stimulus bill on March 11.
"The reopening of the U.S. economy continues to support equity markets as the light at the end of the coronavirus tunnel draws near," said Craig Johnson, technical market strategist at Piper Sandler. " Fiscal and monetary policy support remain unprecedented and well-telegraphed at this juncture."
The plan Biden outlined Wednesday includes roughly $2 trillion in spending over eight years and would raise the corporate tax rate to 28% to fund it.
Still, some on Wall Street grew worried that higher taxes could pose a threat to rebounding corporate earnings and stock prices.
Bank of America equity strategist Savita Subramanian said that the market may still need to digest the tax hikes included in the plan, creating a potential headwind for stocks.
"I think the market is pricing in the good news of infrastructure ... I don't think the market has necessarily priced in the negatives, which is how are we going to pay for this," Subramanian said on CNBC's "Fast Money."
On the data front, an index of U.S. manufacturing activity jumped to a reading of 64.7 last month from 60.8 in February, according to the Institute for Supply Management. That was the highest level since December 1983.
Meanwhile, investors digested a worse-than-expected reading on weekly jobless claims. First-time claims for unemployment insurance for the week ended March 27 totaled 719,000, higher than the 675,000 expected by economists surveyed by Dow Jones.
The key March jobs report will be released Friday, although the stock market will be closed for the Good Friday holiday. Economists expect 675,000 jobs were added in March, and the unemployment rate fell to 6% from 6.2%, according to Dow Jones.
In deal news, Micron Technology and Western Digital are said to be exploring a deal to buy Japanese semiconductor firm Kioxia for about $30 billion, according to a Wall Street Journal report. Micron shares jumped 4.7% on the news, while Western Digital popped 6.9%.
Wall Street just wrapped up March with solid gains. The Dow and the S&P 500 climbed 6.6% and 4.3%, respectively, last month, posting their best month since November. The Nasdaq gained 0.4% in March as tech stocks came under pressure amid rising interest rates.