Following Google AdExchange, the top web SSPs include Index Exchange with 9% market share, Magnite (7%) and PubMatic (6%), according to Pixalate.
As for U.S. mobile app traffic on Apple App Store apps, Verve was the No. 1 SSP with 20% market share. On the Google Play Store, Magnite was No. 1 with 8% market share.