Chatsworth oil and natural gas producer California Resources Corp. was one of the week’s leading gainers. Shares rose 25 percent to close at $1.30.

Unico American Corp., a Woodland Hills property and casualty insurance company, was another strong gainer this week. Shares rose 20 percent to close at $11.22.

MannKind Corp. was the week’s losing stock. Shares for the Valencia biopharmaceutical developer of therapeutic products for diseases such as diabetes and cancer fell 24 percent to close at $1.22 on Friday