Walmart (WMT) loses 13 cents to $58.19 and is one of thirty Dow stocks trading lower Monday morning. Meanwhle, a Dec 57.5 – Jan 60 (1X2) call ratio spread trades on the stock at 8 cents, 4000X. Looks like Jan 60 calls were sold and possibly rolls a position out one month, up 2.5 strikes. Shares of the world’s largest retailer have performed well in recent months, up 12.2 percent since September, and today’s spread might be an adjustment to a buy-write strategy in WMT.