California Resources Corp., a producer of oil and natural gas, ended the week on a high note. On Friday, shares of the Los Angeles company rose 21 percent, closing at $1.56.

Shares of Marathon Patent Group, a Los Angeles company that acquires patent assets from patent holders, rose 15 percent, closing the week at $1.74.

The week’s biggest loser among stocks trading above $1 was Tutor Perini Corp., which specializes in general contracting, building and civil construction. The Sylmar company fell 22 percent this week, closing at $10.66.