Thermo Fisher Scientific stock drops as COO sells shares and investor trims holdings

First Trust Advisors LP cut its stake in Thermo Fisher Scientific Inc. by 37.9% in the first quarter, leaving the firm with 43,524 shares valued at about $21.4 million.

Thermo Fisher’s chief operating officer, Gianluca Pettiti, sold 400 shares on July 27 under a Rule 10b5‑1 plan, generating roughly $226,000 in proceeds and reducing his ownership to 24,651 shares worth about $13.9 million. Both transactions were disclosed in SEC filings.