Amphastar Pharmaceuticals (AMPH) shares were falling over 4% in late Thursday trading after Wells Fargo downgraded the stock to equal-weight from overweight, and cut its price target to $19 from $30.
Trading volume stood at more than 448,000 shares, compared with a daily average of about 592,000.
Price: $17.43, Change: $-0.89, Percent Change: -4.86%