These were the worst performing ASX 200 shares last week 12 December 2020

Last week the S&P/ASX 200 Index (ASX: XJO) managed to keep its winning streak alive and recorded its sixth straight week of gains. The benchmark index rose 0.1% to finish the period at 6,642.6 points.

Not all shares were able to climb higher with the market. Here’s why these were the worst performers on the ASX 200 over the period:

The Appen share price was the worst performer on the ASX 200 last week with a disappointing 14.5% decline. Investors were selling the artificial intelligence services company’s shares after it downgraded its FY 2020 guidance. Due to COVID-19 headwinds, Appen expects to report full year underlying earnings before interest, tax, depreciation and amortisation (EBITDA) of $106 million to $109 million…