CARY, N.C.–(BUSINESS WIRE)– Cornerstone Building Brands, Inc. (NYSE: CNR) (the “Company”), the largest manufacturer of exterior building products in North America, today reported first-quarter 2021 net sales of $1,267.0 million and net loss of $1.7 million or one cent per diluted share. This compares with net sales of $1,113.8 million and net loss of $542.1 million or $4.30 loss per diluted share in the same quarter last year.