John O'Brien

American businessperson and board member, former CEO of Allmerica Financial Corporation (now The Hanover Insurance Group, Inc.) and a director at The TJX Company.1

Companies

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

As of each latest filing. The line shows shares held over time.

Recent filings

Career