All three market benchmarks reached record highs on Monday after Congress approved a more than $1 trillion infrastructure spending bill late last week.

The U.S. House of Representatives late Friday passed the bill, sending the spending packed to President Joe Biden's desk for his signature. The bill was first passed by the Senate in August, with the package outlining funding for national transportation, utilities and broadband, among other projects.

Here's how the market settled to start the week:

S&P 500 Index (SPY  ): +0.09% or +4.17 points to 4,701.70

Dow Jones Industrial Average (DIA  ): +0.29% or +104.27 points to 36,432.22

Nasdaq Composite Index (QQQ  ): +0.07% or +10.77 points to 15,982.36

Tesla's Musk asks Twitter followers if he should share 10% of his company stake:

Tesla (TSLA  ) shares took a hit on Monday as investors weighed a weekend Twitter (TWTR  ) poll from CEO Elon Musk on whether or not he should sell 10% of his company stake.

The majority of the poll's respondents said that they supported his potential sale, which would be worth about $21 billion based on the nearly 171 million shares Musk currently holds.

Given the poll's strange nature, a number of analysts have theorized that Musk has likely already started selling shares due to an upcoming tax bill expected from the expiration of 23 million of his stock options in August of next year.

"With a tax bill that we calculate at north of $10 billion, selling stock over the company months is not a surprise, although holding a Twitter poll to sell 10% of his stock is another bizarre soap opera that can only happen to on company and one CEO in the world, Musk," Wedbush analyst Dan Ives wrote in a note on Monday. "We would rather Musk rip the band-aid off now and sell this portion of stock rather than it lingering over the next year and feeding into any non-fundamental bear thesis on the story."

Here's how benchmarks started trading soon after opening bell:

S&P 500 Index: +0.33% or +15.28 points to 4,712.81

Dow Jones Industrial Average: +0.61% or +219.93 points to 36,547.88

Nasdaq Composite Index: +0.22% or +35.55 points to 16,007.14