Fourth Quarter 2019 Results Overview
For the fourth quarter of 2019, net revenue was $401.2 million, an increase of 13.6% from $353.1 million in the fourth quarter of 2018. On a same branch basis, net revenue improved 9.7% from the prior year quarter. Residential same branch sales growth was 5.5% in the quarter, attributable to price gains and more favorable customer and product mix, compared to total completions growth of 16.5%. Our large commercial constructionend-market had organic growth of 10.2%.
Gross profit improved 21.7% to $120.0 million from $98.6 million in the prior year quarter. Adjusted gross profit* as a percent of total revenue was 29.9%, compared to 27.9% for the same period last year. Selling and administrative expense, as a percent of net revenue, was 19.6% compared to 18.7% in the prior year quarter. Adjusted selling and administrative expense*, as a percent of net revenue, was 18.6% compared to 18.0% in the prior year quarter.
Net income was $19.2 million, or $0.64 per diluted share, compared to $16.5 million, or $0.54 per diluted share, in the prior year quarter. Adjusted net income* was $27.6 million, or $0.92 per diluted share, compared to $21.8 million, or $0.72 per diluted share in the prior year quarter. Adjusted net income adjusts for the impact ofnon-core items in both periods and includes an addback fornon-cash amortization expense related to acquisitions.
Adjusted EBITDA* was $55.6 million, a 27.5% increase from $43.6 million in the prior year quarter, largely due to higher sales and improved gross profit. Adjusted EBITDA, as a percent of net revenue, was 13.9% compared to 12.4% in the prior year quarter.
Full Year 2019 Results Overview
For the year ended December 31, 2019, net revenue was $1,511.6 million, an increase of 13.1% from $1,336.4 million in 2018. On a same branch basis, net revenue improved 8.6% from the prior year, primarily due to price gains and more favorable customer and product mix, as well as growth in the number of completed jobs. Same branch residential revenue increased 5.9% as compared to a 6.0% increase in total U.S. housing completions.
Gross profit improved 17.0% to $434.8 million from $371.6 million in the prior year. Gross margin was 28.8% compared to 27.8% in the prior year. Adjusted gross profit* as a percent of total revenue was 28.8%, compared to 27.9% for the same period last year. Selling and administrative expense, as a percentage of net revenue, was 19.1% compared to 18.9% in the prior year. Adjusted selling and administrative expense, as a percentage of net revenue was 18.4% compared to 18.1% in the prior year.
Net income was $68.2 million, or $2.28 per diluted share, compared to $54.7 million, or $1.75 per diluted share in the prior year. Adjusted net income was $98.3 million, or $3.29 per diluted share, compared to $83.5 million, or $2.67 per diluted share in the prior year.
For the full year of 2019, adjusted EBITDA* was $196.8 million, a 19.7% increase from $164.4 million in the prior year. Adjusted EBITDA, as a percentage of net revenue, was 13.0%, compared to 12.3% in the prior year. Operating income was $121.2 million, a 30.0% increase from $93.2 million in the prior year. The incremental adjusted EBITDA margin* on same branch revenue growth was 21.0% (please refer to the Supplementary Tables at the end of this Press Release).
2