Breitburn Energy Partners, a Los Angeles firm focused on the acquisition, exploitation, development and production of oil and gas properties, was one of the week’s leading gainers. Shares rose 46 percent to close at $1 a share on Friday.

Differential Brands Group Inc., a platform focusing on branded operating companies in the premium apparel, footwear and accessories sectors, was also a big gainer this week. Shares for the Commerce firm rose 33 percent to close the week at $6.25.

J2 Global, a Los Angeles internet service provider, was among the week’s losing stocks. Shares fell 22 percent to close the week at $58 a share.