New Delhi, July 7 -- SpaceX joins the Nasdaq 100 Index Tuesday as Wall Street brokerages launch coverage of Elon Musk's rocket, satellite and artificial intelligence company with a clear consensus: buy the stock.

At least six brokers, including Morgan Stanley and Goldman Sachs Group Inc. have started coverage with buy-equivalent ratings, following the end of the traditional quiet period for analysts from banks that helped underwrite its $86 billion initial public offering.

Analysts are leaning into the long-term growth prospects for SpaceX, even as questions over its profitability, execution and valuation continue to linger after a blockbuster market debut. Morgan Stanley, among the biggest bulls, said the company stands to gain from de...