Differential Brands Group Inc., a new downtown Los Angeles apparel firm that grew out of Joe’s Jeans, made a different kind of fashion statement Friday when shares of the new company rose 26 percent for the week, closing at $8.

Tutor Perini Corp., a Sylmar company specializing in general contracting, building and civil construction, rose 24 percent this week, closing at $13.21.

The week’s biggest loser among stocks trading above $1 was OSI Systems, Inc. is Hawthorne developer and marketer of security and inspection systems, fell 30 percent this week, closing at $54.82.