PubMatic and Sizmek ink SPO pact to answer advertisers' transparency call

Adtech outfits PubMatic, and Sizmek have today (April 10) announced a global supply path optimization (SPO) partnership with Sizmek, as research suggests that the programmatic market will top $46bn in the US this year. 
The partnership means that Sizmek now includes sell-side platform (SSP) PubMatic in its network of preferred publisher platforms in a pairing they hope will consolidate programmatic ad spend, providing advertisers with more transparency.
It means that Sizmek will also work w