Top Asphalt Shingle Manufacturers in North America
There are many options when trying to choose the best asphalt shingle for your roof. Each manufacturer has numerous types of shingles that vary in style, color, features and lifespan. Shingle reviews will vary greatly, and accurate rankings can be difficult to find.
Negative reviews are not always because of an inferior product. Many public reviews are tainted by bias (think about the Chevy fan that says all Fords are junk). They can also be due to poor installation by the contractor/homeowner, wrong usage for the product (low slope, etc.). Shingles that improperly stored or handled can cause issues that are not the fault of the manufacturer. 
There are cases of bad batches of shingles or even a total failure of a product in which the shingle never gets close to its warranted lifespan. When choosing a shingle, talk with your contractor about the quality of the shingle and the warranty. Keep in mind that each shingle manufacturer has specific qualifications that must be met in order for a warranty to be honored.
Below is a list of major shingle manufacturers in 2019 in the United States and Canada.
Atlas
BP
CertainTeed
GAF
IKO
Malarkey
Owens Corning
PABCO
Tamko