Meta downgraded, MongoDB upgraded: Wall Street's top analyst calls

The most talked about and market moving research calls around Wall Street are now in one place. Here are today's research calls that investors need to know, as compiled by The Fly.Top 5 Upgrades: RBC Capital upgraded Builders FirstSource (BLDR) to Outperform from Sector Perform with an unchanged price target of $119. The stock's valuation pullback creates an attractive risk/reward, the firm tells investors in a research note.Goldman Sachs upgraded AIG (AIG) to Buy from Neutral with a price target of $90, u ...