Fourth quarter 2022 gross profit and gross profit margin was $11.6 million, or 27.3% of revenue, an increase of $3.2 million, or 38%, from $8.4 million, or 19.6% of revenue, for fourth quarter 2021. Sequentially, this is an improvement of $4.6 million or 65% from the third quarter of 2022. The increase in gross profit margin was a result of realization of our price increases and improved labor efficiency. Materials, transportation, and other variable costs, as a percentage of revenue, improved from prior quarter and prior year as the price increases announced earlier in the year contemplated the rising material and other input costs. Gross profit for the fourth quarter also benefited from the impact of the weakening Canadian dollar on U.S. dollar reported results, which is included in the above variances.
Fourth quarter 2022 Adjusted Gross Profit and Adjusted Gross Profit Margin (see “Non-GAAP Financial Measures”) were $13.6 million and 32.0%, respectively, or an increase of $2.7 million and 25% compared to the prior year’s fourth quarter. Adjusted Gross Profit excludes depreciation and amortization costs of $2.0 million, or 4.7% as a percent of revenue in the quarter ended December 31, 2022 and $2.4 million, or 5.6% as a percent of revenue for the fourth quarter 2021.
Sales and marketing expenses for the quarter were $5.9 million, a $3.4 million decrease from $9.3 million in the prior year’s fourth quarter. The decrease was largely related to lower salary and benefit expenses due to planned headcount reductions as part of our cost reduction initiatives, and lower travel meals and entertainment due to timing of certain tradeshows in 2021.
General and administrative expenses for the quarter were $4.1 million, a decrease of $4.0 million from $8.0 million in the prior year’s fourth quarter. The change is due to reductions in salaries and benefits from planned headcount reductions as part of cost reduction initiatives as well as reduced professional fees, and a recovery of certain professional fees on a legal settlement, during the quarter.
Operations support expenses for the quarter were $2.2 million, a decrease of $0.3 million from $2.5 million in the prior year’s fourth quarter. The decrease was due to reduced travel costs in the quarter.
Technology and development expenses for the quarter were $1.8 million, a decrease of $0.4 million from $2.2 million in the prior year’s fourth quarter due to reductions in salaries and benefits expenses. We note we are currently active in hiring ICE engineers and plan to invest in ICE development in coming years as we remain excited about the opportunity within ICE for DIRTT directly. ICE is DIRTT’s proprietary design integration software.
During the quarter, the Company incurred $1.2 million in reorganization costs, which includes termination benefits incurred on headcount reductions and executive changes, and costs to reimburse a shareholder for expenses incurred related to the 2021 contested director election. We expect reorganization costs to subside following the first quarter of 2023.
Net loss for the quarter was $(5.9) million compared to $(16.0) million for prior year’s fourth quarter. The lower net loss is primarily the result of the higher gross profit margin and reduced operating expenses explained above.