Monday marks the last chance for investors to receive the next dividend payout from NuStar Energy (NYSE:NS). What’s HappeningThe company announced on Thursday that it would pay shareholders a quarterly dividend of 40 cents per share. On Tuesday, NuStar Energy will go ex-dividend, meaning the stock will trade lower to reflect that payout. In other words, the stock will likely open 40 cents lower than it would have opened on any other day. In order to be eligible to receive a company’s dividend, shareholders must own the stock prior to the ex-dividend date—in this case, Tuesday. Shareholders who…