Gross profit margin for the fourth quarter 2020 was 28.2%, compared to 24.0% in the prior year. The increase was attributable to higher revenue volumes within Products & Solutions, lower charges related to slow-moving and obsolete inventory and transformation program cost savings.
Resideo’s operating profit of $152 million in the fourth quarter 2020 more than doubled compared to a prior year operating profit of $72 million. Products & Solutions segment operating profit of $166 million in the fourth quarter 2020 increased from $84 million in the prior year. The increase was the result of higher revenue, improved fixed cost absorption and transformation savings. ADI Global Distribution segment operating profit increased to $59 million in the fourth quarter 2020 from $52 million in the prior year, primarily due to higher revenue. Total Corporate costs were $73 million, up from $64 million in the prior year primarily due to increased bonus payouts, partially offset by impacts from transformation program cost savings.
Net income for the fourth quarter 2020 was $59 million, or $0.44 per diluted common share, compared with a net loss of $9 million, or a loss of $0.07 per diluted common share, in the prior year.
Full Year 2020 Performance
Consolidated revenue for the full year 2020 was $5.1 billion, up 2% compared with consolidated revenue for the prior year of $5.0 billion. Products & Solutions segment revenue was $2.1 billion, a decrease of 2% compared with $2.2 billion for the prior year. ADI Global Distribution segment revenue was $3.0 billion, an increase of 5% compared with $2.8 billion for the prior year.
Gross profit margin for the full year 2020 was 25.9%, compared to 25.6% for the prior year. The improvement in gross profit margin was the result of positive impacts from our ongoing transformation and cost savings programs. This was partially offset by unfavorable product mix across both segments, lower volumes in Products & Solutions and costs associated with COVID-19.
Operating profit of $311 million for the full year 2020 increased 21% compared to operating profit of $258 million for the prior year. Products & Solutions segment operating profit for the full year 2020 of $407 million represented a 24% increase from $327 million for the prior year. Within the Products & Solutions segment, operating profit was positively impacted by cost savings from transformation programs, sourcing productivity and reduced inventory reserve costs. These cost reductions more than offset the impact of lower revenue volumes, unfavorable sales mix and investments to support new product launches. ADI Global Distribution segment operating profit for the full year 2020 of $194 million, represented an 8% decline from $210 million for the prior year. ADI Global Distribution segment operating profit was negatively impacted by commercial investments, unfavorable sales mix and acquisition related costs. Corporate costs increased to $290 million from $279 million, up 4%, and were negatively impacted by expenses related to transformation projects and increased bonus payouts from improved performance. These impacts were partially offset by transformation program cost savings and reduced spin-off related costs.