Top 20 Pharma spent 511M in 2015 to advertise on CBS ; CBS's 2015 Advertising Revenue was 5.82B ; CBS's 2015 Net Revenue was 13.89B and Net Profit was 1.62B
So basically, in 2015, Top 20 Pharma made up about 9% of CBS's 2015 advertising revenue. Hard to get a full breakdown, but I'd bet that on a per-industry basis, pharma is the #1 or #2 advertiser on CBS. Also interesting to see Fox's share is so low, given it has the most viewers ( Fox Maintains its #1 Viewership Spot for 14th Year in a Row as of 2015 ; Note Fox also ran that highly Bayer-unfriendly clip in 2006 that's linked above).
So basically, in 2015, Top 20 Pharma made up about 9% of CBS's 2015 advertising revenue. Hard to get a full breakdown, but I'd bet that on a per-industry basis, pharma is the #1 or #2 advertiser on CBS. Also interesting to see Fox's share is so low, given it has the most viewers ( Fox Maintains its #1 Viewership Spot for 14th Year in a Row as of 2015 ; Note Fox also ran that highly Bayer-unfriendly clip in 2006 that's linked above).