In a week where the Dow Jones industrial average dropped 4 percent, the Los Angeles Business Journal’s index of the 200 largest public companies followed suit, shedding 2.6 percent on 138 of the companies either losing ground or staying flat for the week.

Losing the most was Commerce-based high-end denim manufacturer Blue Holdings Inc., which received a delisting notice from the Nasdaq and lost its CFO. Shares lost 25 percent to close out at 47 cents.

With a slowing economy and sluggish sales, local homebuilders were also hit hard. Los Angeles-based KB Home shed 21 percent for the week, to $20.52, while Calabasas-based Ryland Group Inc. lost 18 percent, to $27.52.

Gaining the most was Patient Safety Technologies Inc., which had one of its subsidiaries’ products used in over 100,000 procedures without an incident. Shares gained 18 percent to $1.30.

Los Angeles-based all natural beverage maker Reed’s Inc. also gained 18 percent after posting strong first quarter results. Shares closed the week at $2.60.

Finally, shares in Health Net Inc. gained after the Woodland Hills-based healthcare company held its annual investor day this week apparently pleasing investors. Shares gained 14 percent to $30.73.