Looking at the universe of stocks we cover at Dividend Channel, on 8/20/14, OM Group, Inc. ( OMG), W & T Offshore Inc ( WTI), and Tesco Corp. ( TESO) will all trade ex-dividend for their respective upcoming dividends. OM Group, Inc. will pay its quarterly dividend of $0.075 on 9/5/14, W & T Offshore Inc will pay its quarterly dividend of $0.10 on 9/12/14, and Tesco Corp. will pay its quarterly dividend of $0.05 on 9/2/14.As a percentage of OMG's recent stock price of $26.03, this dividend works out to approximately 0.29%, so look for shares of OM Group, Inc. to trade 0.29% lower — all else being equal — when OMG shares open for trading on 8/20/14. Similarly, investors should look for WTI to open 0.73% lower in price and for TESO to open 0.25% lower, all else being equal. Below are dividend history charts for OMG, WTI, and TESO, showing historical dividends prior to the most recent ones declared. OM Group, Inc. (OMG):
W & T Offshore Inc (WTI):
In Monday trading, OM Group, Inc. shares are currently up about 0.8%, W & T Offshore Inc shares are off about 0.9%, and Tesco Corp. shares are up about 2.1% on the day.