NEW YORK, NY / ACCESS Newswire / January 2, 2026 / Stagwell (NASDAQ: STGW ), the challenger network built to transform marketing, today announced its Chairman and CEO Mark Penn will attend the 28th Annual Needham Growth Conference in New York on Wednesday, January 14. Penn will host 1x1 meetings throughout the day and participate in a fireside chat at 2:15 PM ET. ...