Stifel analyst Nathan Jones said he believes today's weakness in shares of Gardner Denver is being driven by competitor Weir Group's comments that oil and gas market conditions were in line with expectations through mid-August but that it saw initial signs of pricing pressure in the last two weeks of August. Weir also said it saw considerable softening in demand for OEM equipment and some delivery deferrals in the back half of August, noted Jones. He sees it as likely that Gardner Denver's upstream energy business, which makes up about 25% of revenue, will experience the same conditions that Weir is reporting, Jones tells investors. He has a Buy rating on Gardner Denver shares, which are down $1.81, or 6.7%, to $25.18 near 1 pm ET.