Zynex, Coherus BioSciences , Universal Insurance Holdings — Coherus, Zynex and Universal Insurance stock fell on news from S&P 500 Dow Jones indices that the stocks would be moving within small-cap indexes. Coherus is leaving the MidCap 400 for the MidCap 600, while Universal Insurance is leaving the MidCap 600 altogether. American Express — Stock in the credit card giant ticked up 0.5% following an upgrade to outperform from sector perform from RBC earlier Tuesday. The S&P 500 is widely tracked by large index funds, which could create buying pressure on Airbnb's stock in the weeks ahead. Oracle — The software stock added 1.5% in premarket trading following an upgrade to overweight from equal weight by Barclays.

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Persons: Dow Jones, Zynex, Airbnb, acquirer Thomas Bravo, —, Alex Harring, Jesse Pound Organizations: New York, Coherus BioSciences, Universal Insurance Holdings, Universal Insurance, RBC, Healthcare, Bloomberg, Oracle, Barclays, Brady, Brady Corporation, FactSet, Warner Bros Locations: Airbnb