Shares of Navidea Biopharmaceuticals, Inc. NAVB surged 91.3% after the biopharmaceutical company announced positive preliminary results from the second interim analysis of its ongoing NAV3-31 Phase 2B study.Shares of Xeris Pharmaceuticals, Inc. XERS soared 28% after the specialty pharmaceutical company reported findings from outpatient portion of Phase 2 proof-of-concept study of its developmental ready-to-use glucagon in patients at risk of postprandial hypoglycemia following bariatric surgery.Shares of T2 Biosystems, Inc. TTOO rose 12.8% after the in vitro diagnostics companysaid it expects to ship first SARS-CoV-2 tests to American customers as early as June-end.Shares of Splunk Inc. SPLK gained 12.7% after the company reported first-quarter fiscal 2021 non-GAAP loss of 56 cents per share, which was lesser than the Zacks Consensus Estimate of a loss of 57 cents.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Splunk Inc. (SPLK): Free Stock Analysis Report Navidea Biopharmaceuticals, Inc. (NAVB): Free Stock Analysis Report T2 Biosystems, Inc. (TTOO): Free Stock Analysis Report Xeris Pharmaceuticals, Inc. (XERS): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research