After summarizing the key topics from Q4 earnings calls from public E&P operators and Mineral Aggregators, this week, we turn our attention to the Q4 earnings calls from Oil Field Service companies. Key themes include 1) macroeconomic headwinds, such as labor shortages and supply chain constraints; 2) the anticipation of greater M&A activity and industry consolidation in 2022; and 3) ESG, including recognition of OFS operator initiatives from outside the industry, the mitigation of environmental impacts on local communities at present, and projections of continued demand for ESG-focused services.