Take a look at some of Monday's after-hours buzz:
Civeo plunged more than 26 percent in extended-hours trade after the oil services firm reported weaker-than-expected guidance for next year, including sharply lower capital expenditures, due to rapidly declining oil prices. Two of the largest shareholders are activist hedge funds JANA Partners and David Einhorn's Greenlight Capital.
Armour Residential REIT edged lower in after-hours trade on news the mortgage-backed securities fund was downgraded to "hold" from "buy" at MLV.
Of major fast food brands, only McDonald's saw after-hours activity, edging lower in extended-hours trade. New York burger chain Shake Shack filed on Monday for an initial public offering with Securities and Exchange Commission regulators to raise $100 million.
Gilead Sciences edged slightly higher in after-hours trade after Morgan Stanley upgraded the stock to "overweight" from "equal-weight."