Cardio Diagnostics Holdings is trading 5.6% down at $1.69, with no clear company-specific catalyst identified for the October 13 pre-market decline. - The stock is down from the October 12 close of $1.78. - An overnight report covered director Peter K. Fung’s Form 4 for September 30 but did not describe a connection to the price move. - Healthcare was higher while Nasdaq futures were lower; neither clearly explains the decline. No volume details were provided.