Check out the companies making headlines after the bell Monday:
Shares of AIG fell almost 2 percent on Monday after the company reported results that missed Wall Street's lowest estimates. The insurance giant reported adjusted third-quarter earnings of 52 cents per share on $12.82 billion in sales. Earnings fell about 60 percent from $1.19 per share in the previous year. Analysts expected AIG to post earnings of $1.03 per share on $14.22 billion in revenue, according to a consensus estimate from Thomson Reuters.
Fitbit took a nasty plunge despite quarterly results that beat on both the top and bottom line. Shares of the wearable fitness device maker dropped about 8 percent after the company announced plans to sell an additional 21 million shares, including 14 million held by "certain shareholders." The timing of the secondary offering is yet to be determined.
Avis Budget, the car rental company, fell 8 percent in after-hours trade when it reported earnings, revenue and guidance that came in below expectations.
Shares of steak restaurant Texas Roadhouse popped about 4 percent with earnings that where virtually in line with Wall Street forecasts. The company also reported positive comparable restaurant sales growth for the quarter.
Allstate got a modest boost after the personal lines insurer reported earnings that beat estimates and revenue in line with Wall Street's forecasts.
— CNBC's Jacob Pramuk and Reuters contributed to this report.