The two largest medical device companies headquartered in Massachusetts have gained around $4.5 billion in market cap combined this week after reporting stronger-than-expected earnings.
Thermo Fisher Scientific has gained about $3 billion in market cap since reporting its fourth quarter and full-year 2016 earnings on Monday morning. Boston Scientific, which reported earnings Thursday morning, has seen its market cap increase by about $1.5 billion.
Thermo Fisher, based in Waltham, reported that revenue from its life sciences business grew 10 percent in the fourth quarter and by 12 percent for the year.
