It’s helping both of their stocks. Tesla plans to launch a self-driving robotaxi service at the end of 2025. Alphabet’s self-driving robotaxi company Waymo already operates in four cities—Phoenix, Los Angeles,

Elon Musk said there is a path for Tesla to become worth more than the next five most valuable companies combined. That’s Apple, Nvidia, Microsoft, Amazon.com, and Alphabet. Their market values total roughly $15 trillion.

Tesla (TSLA-0.72%) has been one of the best-performing stocks on the market over the last five years but also remains a battleground among investors. CEO Elon Musk has long been a lightning rod for controversy,

Tesla emphasised its confidence in the future of artificial intelligence and full self-driving (FSD) technology, despite reporting a more than 70 per cent drop in net profit last quarter and revenue falling short of analysts' expectations.

Microsoft's disappointing Azure numbers are "neutral to modestly negative" for rivals Amazon.com and Alphabet, according to RBC Capital Markets analyst Brad Erickson. Alphabet stock rose 1% while Amazon's was marginally lower.

Tesla shares have advanced 50% in the last three months on expectations the company will benefit from the ties between CEO Elon Musk and President Donald Trump, especially where a

Tesla investors will look for more details on the automaker's lower-priced model when it reports quarterly results on Wednesday.

In a move that could redefine the ride-hailing industry, Tesla has announced plans to launch its autonomous robotaxi service in Austin

Waymo said it is launching fully driverless robotaxi rides for employees in Atlanta, an important step before the company opens the service up to members

Waymo plans to start testing autonomous vehicles in 10 new cities this year, starting with Las Vegas and San Diego, according to The Verge. However, this

Alphabet's self-driving unit Waymo announced on Wednesday it plans to expand testing of its autonomous driving technology in over 10 new cities in 2025.

This week's action in the stock market has made clear that the S&P 500 has become a riskier play - despite its status as the benchmark for U.S. large-cap stocks - because it has become a highly concentrated growth index. But there is an easy way to cut this risk while still holding large-cap growth stocks in a low-cost index fund.