Aug 5 (Reuters) - CDW reported second-quarter gross profit margin below Wall Street ‌estimates on Wednesday, offsetting stronger-than-expected ‌revenue and sending the IT solutions provider's shares ​down 14% in premarket trading. The Vernon Hills, Illinois-based company also said its CFO Albert Miralles will retire from the ‌role next ⁠year. • CDW reported net sales of $6.57 billion in the second ⁠quarter, beating estimates of $6.21 billion, according to data compiled by LSEG. • ‌Enterprise technology spending has remained resilient as companies invest in AI infrastructure, cloud computing and data center upgrades, benefiting firms such as CDW. • Gross profit margin ‌for the quarter ​came in at 20.1%, ​below estimates ​of 21.2%, primarily due to ‌a sales mix shift ​toward lower-margin ​hardware products.