The top 50 emitters make up about 4% of the total, which is a lot, but perhaps not as much as you might think. They largely seem to consist of oil and gas fields.
I would've expected the large cities, including the smaller companies without individual mentions within to form the bulk of emissions. However, you see things like megacities like London with only 4.4Mt of co2 emissions, while there's tons of random cement factories around with 1Mt of co2 emissions. Power plants also make up less of the emissions than I expected, except for those in China, which seem less efficient than those in the west (except you DRAX and Belchatow)
It looks like if we found ways to significantly reduce emissions of: oil/gas fields, cement plants, steel plant, coal mines, airports and Chinese power plants, that'd make a huge impact.