By Charlie Conchie Shares in Abrdn plunged today after the asset manager reported a £320m loss and a sharp slide in assets under administration in the first six months of the year, after a turbulent period on markets. In its half year trading update today, the FTSE 100 investor swung to a loss before tax of after it reported a profit of £113m in the same period last year. Nervous investors pulled cash from the firm as wild swings rocked equity markets, with total net outflows totalling £35.9bn. The volatility has also hammered the value of Abrdn’s total assets under management which slid to £5…