Tri-county public companies ended the worst week for Wall Street since 2008 with a 5 percent drop March 20, as the threat of a recession loomed larger in the wake of the coronavirus outbreak. 

Stocks had a mixed close, with losses among several biotech firms, including regional biotech giant Amgen. Shares fell another 5.3 percent to $188.25. 

Goleta breast implant maker Sientra’s shares plunged to an all-time low, down 14 percent to $1.07, the day’s largest drop. Avocado distributor Calavo Growers, out of Santa Paula, and Camarillo electronics maker Qualstar both fell 11.4 percent, capping off a week of losses. 

Software makers The Trade Desk and QAD had light gains, while citrus grower Limoneira rose 5.2 percent. 

Arcutis Biotherapeutics continued to surge, despite losses among other drugmakers, rising 32 percent to $33.32, up 53 percent from its Jan. 31 initial public offering.

• Contact Marissa Nall at mnall@pacbiztimes.com.