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Just 24 brands have released commercials and/or ad teasers -- on platforms including YouTube and Facebook, according to data from iSpot.tv.
That comes to about $13.5 million in media spending.
Looking at the year ago period, 40 brands pre-released their ads worth $18.7 million.
Porsche and Doritos have had a large amount of online views getting 4 million and 1.8 million views, respectively.
This iSpot research comes from online views of Facebook and YouTube.
Commercials during this year's game were sold for $5.6 million per 30 second spot.
The game will be broadcast on FOX on February 2.