Isthmus Partners LLC bought a new stake in shares of Quest Diagnostics Incorporated (NYSE:DGX – Free Report) in the 4th quarter, Holdings Channel.com reports. The firm bought 90,131 shares of the medical research company’s stock, valued at approximately $12,427,000. Quest Diagnostics makes up 1.6% of Isthmus Partners LLC’s holdings, making the stock its 20th biggest […]