Ex-dividend dates are very important to dividend investors, since you must purchase a stock prior to its ex-dividend date in order to receive its upcoming dividend payout. Below are 10 big-name stocks going ex-dividend for the week of February 11-15, 2013.

Valero Energy Corporation (VLO) is set to trade ex-dividend on February 11. The oil company has a dividend yield of 1.76% based on Wednesday’s closing price of $45.44 and its quarterly dividend payout of 20 cents per share. Dividend.com currently rates VLO as “Neutral” with a DARS™ rating of 3.3 stars out of 5 stars.

Wynn Resorts, Limited (WYNN) has an ex-dividend date of February 12. The casino resort and hotel operator, known for its Las Vegas and Macau properties, offers a dividend yield of 3.24% based on Wednesday’s closing price of $123.30 and its quarterly dividend payout of $1.00 per share. Dividend.com recently upgraded WYNN to “Recommended” with a DARS™ rating of 3.5 stars out of 5 stars.

The Boeing Company (BA) is set to go ex-dividend on February 13. The world’s leading aerospace company offers a dividend yield of 2.54% based on Wednesday’s closing price of $76.29 and its quarterly dividend payout of 48.5 cents per share. Dividend.com currently rates BA as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

Eli Lilly & Co. (LLY) has an ex-dividend date of February 13. The prescription drug maker has a dividend yield of 3.63% based on Wednesday’s closing price of $53.93 and its quarterly dividend payout of 49 cents per share. Dividend.com currently rates LLY as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

Chevron Corporation (CVX) is set to trade ex-dividend on February 13. The oil company has a dividend yield of 3.11% based on Wednesday’s closing price of $115.91 and its quarterly dividend payout of 90 cents per share. Dividend.com currently rates CVX as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

Walgreen Company (WAG) has an ex-dividend date of February 13. The country’s largest drugstore chain offers a dividend yield of 2.65% based on Wednesday’s closing price of $41.44 and its quarterly dividend payout of 27.5 cents per share. Dividend.com currently rates WAG as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

3M Co. (MMM) is set to trade ex-divined on February 13. The diversified technology giant has a dividend yield of 2.47% based on Wednesday’s closing price of $102.69 and its quarterly dividend payout of 63.5 cents per share. Dividend.com currently rates MMM as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

E.I. du Pont de Nemours and Company (DD) is set to trade ex-dividend on February 13. The diversified chemical company commonly known as DuPont has a dividend yield of 3.63% based on Wednesday’s closing price of $47.44 and its quarterly dividend payout of 43 cents per share. Dividend.com currently rates DD as “Neutral” with a DARS™ rating of 3.2 stars out of 5 stars.

Harley-Davidson, Inc. (HOG) has an ex-dividend date of February 14. The well-known American motorcycle maker has a dividend yield of 1.59% based on Wednesday closing price of $52.89 and its quarterly dividend payout of 21 cents per share. Dividend.com currently rates HOG as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

Target Corporation (TGT) is set to trade ex-dividend on February 15. The discount retailer has a dividend yield of 2.30% based on Wednesday’s closing price of $62.69 and its quarterly dividend payout of 36 cents per share. Dividend.com currently rates TGT as “Neutral” with a DARS™ rating of 3.4 stars out of 5 stars.

Be sure to visit our complete recommended list of the Best Dividend Stocks, as well as a detailed explanation of our ratings system here.