After-hours buzz: Valero, Navient & more

Check out the companies making headlines after the bell Monday:

A trader works on the floor of the New York Stock Exchange.
Adam Jeffery | CNBC
A trader works on the floor of the New York Stock Exchange.

Navient - The loan management provider said it expects second-quarter core earnings of about 40 cents a share and full-year earnings of about $1.85 a share. Shares fell more than 13 percent on the news.

JetBlue - Shares inched lower after the airline said passenger revenue per available seat fell about 1 percent in June from a year ago.

Valero Energy - The fuel provider declared a quarterly cash dividend of 40 cents per share. The company also said its board approved a $2.5 billion stock buyback, bringing its total share repurchase program to $2.9 billion. The stock rose about 2 percent after the announcement.

AXIS Capital Holdings - The insurer said it sees second-quarter adjusted earnings of between 90 cents and 96 cents per share. Shares fell about 4 percent in after-hours trading.