Shares of cybersecurity firm Cloudflare (NET 3.76%) were up Friday, gaining 3.9% as of 12:30 p.m. ET. The stock was up as much as 5.4% earlier in the day. The leg up comes as the S&P 500 (^GSPC 1.28%) and the Nasdaq Composite (^IXIC 1.84%) were up 1% and 1.7%, respectively.An analyst at Citigroup upgraded Cloudflare's rating, helping to boost the stock.Higher highsIn a research report on Friday, Citi's Fatima Boolani upgraded Cloudflare from neutral to buy, adjusting her price target for Cloudflare stock fr ...