What happened Shares of Magnite (NASDAQ: MGNI) dropped by as much as 16% today after getting a downgrade from Wall Street. As of 2:40 p.m. EST, shares had somewhat recovered and were only down 9%. So what Truist Securities downgraded its rating on Magnite shares from buy to hold, while analyst Matthew Thornton adjusted his price target from $12 to $37 to accommodate for the recent rally. The jump has put Magnite's valuation into ambitious territory and altered the risk/reward profile. Current levels properly value the company's prospects, and the possibility of slowing growth in the second half of 2021 could create some risks, in Thornton's view. Image source: Getty Images. The advertising technology stock had jumped to all-time highs on Friday after Craig-Hallum boosted its price target from $25 to $45. Now what Thornton boosted his forecasts but warned that growth in the second half of the year could decelerate to 12%, down from the 60% expected in the first half. Some of the recent growth has been due to the merger with Telaria, which closed last April. Additionally, the COVID-19 pandemic affected the advertising industry in mid-2020, which will create favorable year-over-year comparisons. Magnite faces some other possible risks around the long-term take rate as well as potential concerns around data privacy, according to Thornton, but should continue to benefit from the shift of advertising budgets to connected-TV platforms. The company is scheduled to report fourth-quarter results on Feb. 24. 10 stocks we like better than Magnite, IncWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Magnite, Inc wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 Evan Niu, CFA has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Magnite, Inc. The Motley Fool has a disclosure policy.Source